We are regularly supplying rubber liners up to 26 ft diameter ball mills. We design liners to optimize power for maximum throughput and increased liner life. These liners are custom designed for your mills.
PolyStl liners are composite of Special Wear Resistant Steel and High Pressure Moulded Rubber which are suitable for AG Mills, SAG Mills, Primary Mills and Ball Mills with ball diameters 3 inches and larger.
To a more significant degree than in other comminution devices,SAG Mill Liner Design and Configuration can have a substantial effect mill performance. In general terms, lifter spacing and angle, grate open area and aperture size, and pulp lifter design and capacity must be considered. Each of these topics has had a considerable amount of research, and numerous case studies of evolutionary liner design have been published. Based on experience, mill-liner designs have moved toward more open-shell lifter spacing, increased pulp lifter volumetric capacity, and a grate design to facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity. As a guideline, mill throughput is maximized with shell lifters between ratios of 2.5:1 and 5.0:1. This ratio range is stated without reference to face angle; in general terms, and at equivalent spacing-to-height ratios, lifters with greater face-angle relief will have less packing problems when new. but experience higher wear rates than those with a steeper face angle. Pulp-lifter design can be a significant consideration for SAG mills, particularly for large mills. As mill sizes increases, the required volumetric capacity of the pulp lifters grows proportionally to mill volume. Since AG/SAG mill volume is roughly proportional to the mill radius cubed (at typical mill lengths) while the available cross-sectional area grows only as the radius squared, pulp lifters must become more efficient at transferring slurry in larger mills. Mills with pebble-crushing circuits will require grates with larger apertures to feed the circuit.
No discussion of SAG milling would be complete without mention of relining. Unlike a concentrator with multiple grinding lines, conducting SAG mill maintenance shuts down an entire concentrator, so there is a tremendous focus on minimizing required maintenance time; the reline timeline often represents the critical path of a shutdown (but typically does not dominate a shutdown in terms of total maintenance effort).
SAG Mill Reline times are a function of the number of pieces to be changed and the time required per piece. Advances in casting and development of progressively larger lining machines have allowed larger and larger individual liner pieces.
While improvements in this area will continue, the physical size limit of the feed trunnion and the ability to maneuver parts arc increasingly limiting factors, particularly in large mills. The other portion of the equation for reline times is time per piece, and performance in this area is a function of planning, training/skill level, and equipment.
As with rod and ball mills liner designs for autogenous and semi-autogenous mills have been in a state of flux for a number of years. Operators continually search for optimum designs. Each mill application and each liner material coupled with varying mill diameters will produce a different internal wear pattern. In addition lifter spacing and lifter height will have an effect on mill performance and liner wear rate.
On fully autogenous mills featuring reversible rotation significant success has been achieved by the use of Ni-hard wear plates with replaceable clamp type lifters of chrome-molybdenum steel, or one of the tough iron alloys. Ni-hard can be used as liner plates in fully autogenous operations because theres no point impact action of 4 to 5 diameter steel balls as in semi-autogenous grinding.
Lifter spacing around the shell periphery has generally been satisfactory with the number of lifters at twice the inside shell diameter in feet. For example, on a 28 diameter mill there would be 56 lifters per circle. It has been found that these lifters provide a definite aid in the autogenous grinding action. When wearing occurs, grinding efficiency drops.
In contrast, it has been found that radial lifters on the ends are required only to protect the Ni-hard wear plates from abrasion and to extend their life. These lifters have been spaced at the frequency of one per foot of diameter; for example, again on a 28 diameter mill, there would be 28 equally spaced radial rows of lifters on each end.
If the discharge diaphragm does not have a large enough capacity the mill will display all the outward appearances of being too small (or a given capacity. The charge and slurry level will rise, the grind will get coarser, and slurry will leak from the feed chute seals.
In analyzing the diaphragm assembly capacity, grate slot area is important. Perhaps more important is the load carrying capacity of the dischargers or pans behind the grates. If these pans do not have sufficient capacity the classical solution of additional grate area will not always improve the situation. If may in fact make it worse by allowing slurry to spill back to the mill thereby causing the mill to run too wot, allowing the charge to float, reducing the grinding efficiency. In addition, the abnormal internal wear in the diaphragm assembly due to spill-back is also detrimental.
In many cases, depending on the circuit, ports allow the discharge of pebbles or worn balls. In cases such as autogenous mills at the Empire Mine, all the pulp discharges through ports, approximately 3 square, with no slots in the grates.
It is important that autogenous mills have a low level discharge in order for the grinding charge to run as dry as possible. This promotes a good lifting action In the mill and an effective rock grinding action.
In semi-autogenous grinding, especially in non-ferrous ore milling where most of the experience exists, there is a trend toward maximizing the size and weight of wearing internals. In some cases liners and lifters have been combined into an integral casting in order to facilitate fast change-out and maximize the availability of the mill. This trend occurs at the obvious expense of minimizing wear rates and scrap loss.
Liner bolts have ranged from 1.5 to 2.0 diameter. Grade 5 (high strength) bolts are used. In order to use the fully capability of such a bolt, a sealer-washer-nul assembly as shown in Figure 6 is recommended.
The design incorporates a circumferential transition plate welded in place between the end of the shell cylinder and the shell flange. The transition plate dimensions are a result of a stress analysis program for minimizing shell stresses, while optimizing material usage.
It is applicable whether the shell flange is turned inward or outward and whether the shell flange is normal to the cylinder or inclined. The concept is particularly important in the design of large grinding mills of all types.
Three-piece compression-type liner bolt sealer is designed to prevent leakage of slurry or dust from mill liner bolt holes. Used in conjunction with Grade 5 (high-strength) bolts, this assembly is generally applied to rod mills over 10.0 in diameter and ball and autogenous mills greater than 13.5 in diameter. Metal to-metal contact (nut washer retaining ring mill) compresses the seal ring and allows full proof load of liner bolt to be utilized, keeping liners tight, in large diameter, high impact mills.
Successful (or unsuccessful) liner design begins with the original equipment manufacturer. It is vital for the long term success of an operation that design constraints in machines, plants, and circuits be minimized.
Once the process metallurgist has thoroughly tested the ore body and determined the optimum method of mineral recovery; and the plant designer has efficiently and economically laid out the circuit, instrumentation, equipment installation, and building design; and the mill manufacturer has completed his stress analysis and reliability engineering for mill design, the most significant remaining factors that can affect bottom line operational results such as:
Prior to finalization of mill design the owner/operator or his appointee should meet with the mill designer/vendor, contracting/plant design engineer and foundry source to thoroughly review and consider such key factors (1) as:
Liner designs and alloy choices for original new mill installations are unfortunately often cost-constrained because they must be capitalized for accounting purposes. It is an unusual case when new mill liner designs are aimed at increasing machine availability and reducing cost per ton. This is regrettable because many operators acknowledge that just a 1% increase in availability will result in an approximate 3% increase in total annual tonnage! This is so because the total down-time to shut down, start up and re-balance the circuit is generally the same for each liner maintenance shutdown. If the number of those shutdowns are reduced, the tonnage lost during all the preliminaries and start-up balancing is reduced also, thus increasing annual tonnage.
Figure 2 illustrates an idealized S.A.G. or F.A.G. mill liner design showing what is possible to minimize patterns and number of different active liners. Note that the inner and center cone liners and filler rings are identical on both feed and discharge ends.
The Z-shaped or slashed end filler ring allows the shell liners to be interchangeable from end to end. The use of the integral lift bar principle reduces the number of pieces and handling time. This design is also convertible in the future to the patented insert concept as applicable. See Figure 6.
The shell liner profile possible is primarily determined by the chordal dimension. The profile must minimize packing and plate wear but give sufficient lift for proper grinding action. Liner profiles are as numerous as operations. They range from typical plate and lifters to rail or integral liners. Typical head liner design features heavy integral radial ribs to protect the wear plate.
The one-piece design is very common in the industry because of the reduction in the number of pieces. Fewer pieces need to be replaced, hence mill availability increases. For example, a plate and lifter assembly with 864 pieces on the shell was reduced to 288 pieces in the one-piece design or 1/3 of the original. See Figure 3. Higher availability is worth more than slight scrap loss reduction.
The shell liner lift is usually 125-175 mm (5-7 in.) over a 63-75 mm (2.5-3 in.) plate. This amount of lift gives adequate cascade action, good charge, lift and minimal scrap loss. Excessive lift can cause liner damage by impacting balls on the unprotected shell liners. Once lift is lost, slippage occurs with a resultant drop in throughput and increased unit power consumption. An appropriate liner change-out sequence must be chosen to take into account throughput, power and scrap.
The lift on the head liners probably does not significantly contribute to the grinding action, but does significantly extend the life of the head plate. Lift width is up to two times that on the shell and/or greater height. See Figure 5. Because of wider chordal spacing than on the shell cylinder, these lifts should all be full height (not high-low) in order to protect plate area and maximize liner life. Increased lift height rather than width adds more life.
The concept of a patterned replacement or high-low method of shell liner operation has lately become popular in both autogenous and semi-autogenous milling. Here, either two alternating heights of liners are started initially (a high and a low) or a single high set is allowed to wear half way, and then every other axial liner row is replaced by new highs. As the lows wear out they are replaced by new highs, etc. See Figures 8 through 11.
This approach effectively doubles the spacing between two high lifts. In cases where the ore slurry tends to pack between closely spaced high lifts, the high-low system often alleviates this condition.
In order to make this approach successful, it is critical that the low liners or lifters be quickly removeable. This is sometimes difficult if the gaps between liners are tightly packed with ore and ball chips. The use of the patented Wedgit design concept, with integral liners in particular, makes this task a much easier one.
Because the high-low liners are never all new or all worn, mill capacity tends to be more uniform. Mill tonnage does not display the up and down variations experienced when using conventional replacement techniques. Experience to date on mills ranging from 5.5 m (18 ft.) diameter to 11.0 m (36 ft.) diameter shows that capacity is equal or greater than with conventional lining at the same unit power consumption.
End and shell liner design in these mills is much the same as for SAG mills. The effect of liner design on performance is equally as important. For instance, in an iron ore operation using 6.4 m (21 ft.) mills, mill throughput was increased by 15 percent and power consumption reduced by 13 percent by liner redesign alone.
Generally in FAG mills more cascade action is desired, so lift is increased by 25-50 mm (1-2 in.). Plate thickness can be reduced because of lack of point impacts of large balls. Typical profiles are given in Figure 7.
The discharge end of this mill must incorporate some method of conveying the pulp to the outside of the mill. This pulp lifter or pan liner must be covered and protected from the grinding action and a means (the grate) of passing the pulp into the pulp lifter must be provided (see Figures 2 and 5).
If the discharge diaphragm does not have a large enough pumping capacity, the mill will display all the outward appearances of being too small for a given capacity. The charge and slurry level will rise, the grind will get coarser, and slurry will leak from the feed chute seals.
In analyzing the diaphragm assembly capacity, grate slot area is important. Perhaps even more important is the load carrying capacity of the dischargers or pans behind the grates. If these pans do not have sufficient capacity the classical solution of adding additional grate area or increasing the slot size will not always improve the situation. It may in fact make it worse by allowing slurry to spill back into the mill thereby causing the mill to run too wet, allowing the charge to tend to float, and thus further reduce the grinding efficiency. Abnormal internal wear in the diaphragm assembly due to spill-back can often identify this condition.
In many cases, depending on the circuit, ports allow the discharge of pebbles or worn balls. In cases such as autogenous mills at the Tilden, Empire, and Cyprus Bagdad Mines, all pulp and pebbles discharge through ports, with no slots in the grates.
It is important that autogenous and semi-autogenous mills have a low level discharge in order for the grinding charge to run as dry as possible. This promotes a good charge lifting action in the mill and efficient milling conditions.
In the feed end and the cylinder of the mill, the active liners are bolted directly to the end or shell. However, in the discharge end, the active liners must be bolted on top of the pan liners and may require the use of bolts up to 900 mm (36 in.) in length. In a reversible 9.7 m (32 ft.) mill using up to 8% charge of 100-125 mm (4-5 in.) balls it is easy to see how critical proper design becomes. There are mills currently operating in which 90 percent of the liner downtime is chargeable to discharge end problems including bolt breakage, liner shifting and shell hole enlarging!
The discharge assembly on either SAG or FAG must be stabilized to eliminate liner movement. This can be accomplished by bolting the pans separately to the head. If stability is not accomplished, bolt holes in the expensive shell structure of the mill will be permanently elongated requiring extensive repair and costly downtime.
Grate design should incorporate an integral radial lifter. This lift on a grate can increase the grate life by up to 50 percent. The slot opening size is determined by the lump size to be retained in the mill. Grate plugging is minimized by proper slot taper and alloy selection. See Figure 5.
Within the last five years some operators have become aware of the fact that the pan liners are also a wear part and are using a trough-shaped, cast urethane,drop-in liner which protects the pan liner. The pan liner, then becomes a structura part of the mill and theoretically will never be changed. Even if the normal change period of the pan liner is 3-5 years it is an expensive task. It appears that this concept is sound. Tests currently under way show urethane to be sensitive to ore pebble or worn ball particle size. Particles over 25 mm (1 in.) results in high urethane wear generally.
As a brief summary, the materials used in mining wear applications are predominantly steels and irons. The carbon steels used run from plain carbon to high carbon tool steels,but 95% of the steels used are somewhere in the middle of these extremes. Manganese steels used have a range of properties and the types used range from 6 Mn to the- 20-25 Mn types. The majority of these steels are of the 12 Mn standard Hadfield grades. The irons used are of two chemistry groups the- NiHard (Ni-Cr) and the chromium irons (with or without molybdenum).
All have been produced in commercial quantities for over twenty years, and some, notably the Hadfields austentic 12% Mn steel, have been used in the mining industry for over a century. Over the years, improvements in alloys have been achieved by cooperation among research organizations, foundries and mill operators. Research delineated the fundamental metallurgical characteristics; foundries developed production methods to exploit these characteristics in wear parts; and mill operators tested the final product. This pattern of development continues today as better alloys are sought for liners for the large mills of the 1980s.
There are certain fundamental considerations when selecting an abrasion-resistant alloy. The minimum requirement is that the alloy has adequate toughness to avoid breakage in the intended application. Abrasion resistance and toughness tend to mutually exclusive properties, meaning that an alloy with excellent abrasion resistance may have too little impact resistance and therefore may not be a suitable choice. A corollary to the minimum toughness requirement is that the alloy has adequate strength to resist gross deformation. Because they have low yield strength, austenitic 12% Mn steels cannot be used for mill liners they will undergo extensive plastic deformation (or growth) that can break bolts, put enormous stress on the mill shell, etc.
Hardness on the surface of the unworn liner is not necessarily a good indication of wear resistance; a better measure is hardness on the worn surface. The reason for this is that some alloys, notably austenitic Mn steels and austenitic Cr-Mo and Ni-Cr white irons, can work harden in service to higher hardness levels.
The use of fully hardened liquid-quenched and tempered martensitic steels makes it possible to vary the hardness level throughout the mill in a composite approach, e.g. ;. shell liners are usually 388-444 HB, but head liners are subjected to wear, and not as much impact, and these liners can have hardnesses of 400-500 HB. Grates will be 321-375 HB range.
To achieve a balance between the requirements of good wear resistance and adequate toughness in shell and head liners, the M.E. patented insert concept was developed. See Figure 6. The softer, more impact-resistant holder protects the hard, wear-resistant insert providing better wear/ton than the one piece liner.
Because of the nature of the grinding media (large ore pieces) and lack of steel ball media, various white irons are used because of their high abrasion resistance and, if properly alloyed, good toughness. The results of materials tested against one another in a large fully autogenous mill are given in Table III. Note that fully hardened steel performed nearly as well as some irons tested.
Without going into a detailed bolt-by-bolt liner installation/ change procedure the following comments covering general set up to start about a week ahead of the installation date may be helpful to someone organizing a first-time effort.
1. Place bolts near liner conveyor so they can be easily passed into mill. If liner design permits, bolt may be put head first into bolt hole of liner and liner handled with bolt in it. 2. Place nuts and washers for easy access to liner work decks. This may mean hauling small buckets of each item by hand, if crane access is not available. 3. When bolt hole is to be left blank, have plugs on hand.
Suspend impact hammer and air wrench with a chain hoist from a trolley on an overhead I beam where possible. Tools can then be moved to the different bolting or knock-out positions and then be easily moved out of the way.
Some semi-autogenous plants religiously grind out their mills at each liner inspection/maintenance shutdown in order to check the steel ball charge volume. This procedure, while admirable from an analytical mill application parameter standpoint, is devastation to mill liners and grates.
Grinding out exposes all the internals to severe impact conditions uncushioned by ore slurry. Grates tend to become heavily peened, especially those with relatively close slot spacing such as 10 mm to 19 mm (3/8 in. to in.). Although the slots usually clean up after further operation, there may be some reduction in capacity for a short time.
The shell liner assembly is particularly subject to damage during ball-on-liner contact as experienced during grind outs. A close examination of failed massive alloy steel liners only half worn, showed sub-surface fractures directly related to surface peening caused by heavy ball impacting. These sub-surface fractures progressed to the point of actual liner failure.
Mill manufacturers and experienced operators in this area have now learned to estimate the ball charge volume in a semi-autogenous charge using mill power draft and an average charge level as measured from mill centerline to top of charge. From a liner supplier standpoint, this method is certainly preferrable to grinding out.
The use of mill liner handlers has also reduced the need to grind out since they work close to the mill centerline and the leveled, de-watered charge at 30 to 35% mill volume becomes a convenient work platform for the maintenance crew.
By following the above procedures, liner life will be maximized and liner peening will be minimized. If not followed, there is a high chance of seriously damaging the liners and grates, especially with a high percentage of 5 diameter balls as is frequently used.
CIC is a leading comprehensive mill liner supplier for over 60 years and has won high approval from the global customers. The mill liners are used to protect the shell in order to avoid the impact and abrasion from the materials and grinding medium. Different types of mill liners can be used to adjust the movement of materials. CIC has ability to offer solutions for all kinds of mills, such as cement mill, mine mill, ball mill, rod mill, AG mill, SAG mill and etc...
Introduction:CIC is a leading comprehensive mill liner supplier in China. For years, CIC's mill liner spread to all over the world along with CITIC's mills. With the property of leading technology and unique expertise, lower cost and higher availability, CIC's liner have won high approval from the customers.The mill liners are used to protect the shell in order to avoid the impact and abrasion from the materials and grinding medium. Different types of mill liner can be used to adjust the movement of materials. CIC's mill liners are produced by CIC owned Special Steel Workshop and have a large share in the world market with the fine design and excellent performance.CIC's manufacturing ability is not only embodied in the supplying of mill liners for certain mills with detailed specification, but also, and especially in the on-site mapping, model changing and efficiency improving. CIC hasability to offer solutions for all kinds of mills, such as cement mill, mine mill, ball mill, rod mill, AG mill, SAG mill, and etc.Features:Material: High Manganese Steel, Super-High Manganese Steel, High Chromium Casting Iron, Alloy Steel, Chromium-molybdenum Steel, Low Carbon Steel, or as per the customer requests.Hardness: as per your request.Impact Value: as per your request.Tensile Strength: as per your request.Heat Treatment Process: Normalizing, Tempering, Quenching & Tempering.Surface treatment: rust preventive oil, or as per your requests.Process: raw material purchasing - casting- rough machining - heat treatment - semi-machining - finish machining - painting and packing. Various process conditions are available.Standard: ANSI, API, ASTM, BSI, DIN, GB, ISO, JIS.QA and DOC: Chemical Composition Report, Mechanical Properties Report, SpheroidizatioRate Report, UT Report, PT Report, Heat Treatment Report, Dimensions Check Report, Hardness Report and etc.Quality Control: UT Test, MT Test, Visual Inspection, Third Party Inspection, Customer On-site Inspection.Advantages:More than 30 years experienceISO9001:2008 Standard certifiedCustom-made designHigh abrasion resistanceLong service durationEasy and fast installation and replacementOEM and ODM are available.HMCB04 New Type Chromium-molybdenum Steel Mill Liners are a kind of new liners self-improved by CIC. With better performance and property than the common mill liners, HMCB04 Chromium-molybdenum Steel Mill Liners have won great reputation from the final users.Performance ComparisonHMCB04 Chromium-molybdenum SteelCommon Chromium-molybdenum SteelHardnessHB 350-400HB350-375Impact Value80J45JTensile Strength1300J1200JCompetitive Advantages:Self-improved propertyCompetitive Advantages:Self-improved propertyOf longer service lifeOf higher hardnessOf better property of impact value and tensile strengthOf higher hardenabilityWidely used and commonly acceptedOEM and ODM are available.With several decades of development, CIC has become the Manufacturing Base of Liner of Semi-autogenous mills1. Optimizing Manufacturing Process, Guarantee Liner QualityOur high quality liners manufactured by advanced process have covered a wide marketing of semi-autogenous mills.2. Optimizing Liner Design, Eliminating Break of Liner A main working function of the liner is to lift the milling ball to a reasonable height, then fall along right rack and smash against the material enrichment area at the bottom of the mill in order to crush the material effectively. So it is greatly important of reasonable optimizing the liner design and correct guiding the milling ball running track in order that guarantee the optimized operation condition in the mill and effectively protect the shell liner of semi-autogenous mill, meanwhile, can eliminate liner break, prolong the service life and decrease effectively unit wear of liners and milling ball, and improve the hour production per machine.3. Focusing on Detailed Operating Condition, Improving Users' Benefits Optimizing the liner design based on the wear forms of liners in different operating conditions maximally decrease the crashing function of the liners, and effectively decrease the weight of scrap liners. Improving the shape of liners can effectively improve the relative motion state between milling balls and liners, then decrease liner wear by material and milling balls and prolong the liner service life while reducing the users' production cost.
CIC is a leading comprehensive mill liner supplier in China. For years, CIC's mill liner spread to all over the world along with CITIC's mills. With the property of leading technology and unique expertise, lower cost and higher availability, CIC's liner have won high approval from the customers.
The mill liners are used to protect the shell in order to avoid the impact and abrasion from the materials and grinding medium. Different types of mill liner can be used to adjust the movement of materials. CIC's mill liners are produced by CIC owned Special Steel Workshop and have a large share in the world market with the fine design and excellent performance.
CIC's manufacturing ability is not only embodied in the supplying of mill liners for certain mills with detailed specification, but also, and especially in the on-site mapping, model changing and efficiency improving. CIC hasability to offer solutions for all kinds of mills, such as cement mill, mine mill, ball mill, rod mill, AG mill, SAG mill, and etc.
HMCB04 New Type Chromium-molybdenum Steel Mill Liners are a kind of new liners self-improved by CIC. With better performance and property than the common mill liners, HMCB04 Chromium-molybdenum Steel Mill Liners have won great reputation from the final users.
2. Optimizing Liner Design, Eliminating Break of Liner A main working function of the liner is to lift the milling ball to a reasonable height, then fall along right rack and smash against the material enrichment area at the bottom of the mill in order to crush the material effectively. So it is greatly important of reasonable optimizing the liner design and correct guiding the milling ball running track in order that guarantee the optimized operation condition in the mill and effectively protect the shell liner of semi-autogenous mill, meanwhile, can eliminate liner break, prolong the service life and decrease effectively unit wear of liners and milling ball, and improve the hour production per machine.
3. Focusing on Detailed Operating Condition, Improving Users' Benefits Optimizing the liner design based on the wear forms of liners in different operating conditions maximally decrease the crashing function of the liners, and effectively decrease the weight of scrap liners. Improving the shape of liners can effectively improve the relative motion state between milling balls and liners, then decrease liner wear by material and milling balls and prolong the liner service life while reducing the users' production cost.
1. Rubber liners physical density is only about one-sixth of manganese steel, it greatly reduces the weight of ball mill, so when the rubber lining ball mill works, it needs lower the power. Saving electric energy means saving production cost and investment.
3. Low noise. Rubber itself has function of soundproofing, it reduces the noise when rubber liner ball mill works. In a certain way inspires the enthusiasm of the staff, indirectly improves the enterprises production efficiency.
5. Rubber liner ball mill also has features of corrosion resistance. Manganese steel liners create reactions with acid, alkali, salt and other chemicals, it accelerates the wearing of liner, while rubber liner itself is made by special anti-corrosion, thereby extending wearing time.
6. Rubber liner ball mill also saves grinding media. Based on the actual work estimates, compared with manganese steel liner, mineral processing plant with capacity of 100,000 tons per year, rubber linings can save 150,000 tons steel balls.
Normal life time for rubber liner ball mill 1. in the gold ore mill, lining life time reaches 3 to 4 years 2. in the ceramic industry, rubber lining life can be used up to 5 years 3. in cement industry, rubber liner ball mill liners can be used up to 4 years
At MGS Casting, we engineer innovative designs, tailored especially for every customer. Our AG/SAG mill linersare manufactured to the highest industry standard for Autogenous Grinding(AG), Semi-Autogenous Grinding(SAG), Primary / Secondary and re-grind rod or ball mills. MGS Casting mill lining system designed by our highly trained, and dedicated team throughout the world has taken your entire comminution circuit into consideration. Supporting our front line Mill Engineers is a large team of extremely specialized design engineers, material chemists, manufacturing and logistics experts responsible for delivering exceptional service. Optimal mill designs engineered by our team take into consideration service life; grind & power efficiency and ore characteristics, along with costumer circuit constraints both up and downstream of the mill lining.
MGS Casting had successto use ASTM 2074/L2B alloy steel to manufacture AG/SAG mill liners. Under this material, our mill liners span life can be obviously improved. Our Australiacustomers had ordered more than 3000 tons per year of this material mill liners.
Asa casting foundry, MGS Casting also has own SAG mill liner design. In general terms, lifter spacing and angle, grate open area and aperture size, and pulp lifter design and capacity must be considered. Each of these topics has had a considerable amount of research, and numerous case studies of evolutionary liner design have been published. Based on experience, mill liner designs have moved toward more open shell lifter volumetric capacity and a grate designto facilitate maximizing both pebble-crushing circuit utilization and SAG mill capacity. Mill throughput is maximized with shell lifters between ratios of 2.5:1 and 5.0:1. This ratio range is stated without reference to face angle; At equivalent spacing-to-height ratios, lifters with greater face angle relief will have less packing problems when new but experience higher wear rates than those with a steeper face angle. Pulp lifter design can be a significant consideration for SAG mills, particularly for large mill. All mill sizes increases, the required volumetric capacity of the pulp lifters grows proportionally to mill volume.
All brand names, model names or marks are owned by their respective manufacturers. MGS Casting has no affiliation with the OEM. These terms are used for identification purposes only and are not intended to indicate affiliation with or approval by the OEM. All parts are manufactured by, for and warranted by MGS Casting and are not manufactured by, purchased from or warranted by the OEM.
Mill Rubber Lining Parts Produced By Hebei Fengmang Technology Co.,Ltd Is Widely Used In Mining, Conveying Of Non-Ferrous Metals And Ferrous Metals, Tailings Engineering, And Providing Wear-Resistant Rubber Parts For Coal Mines And Power Plants. Rubber Lining Has Gradually Replaced The Traditional Cast Steel Lining And Won The Positive Evaluation Of Users. After Long-Term Research And Development, Design And Test, Our Company Has Successfully Invented Rubber Lining, Composite Lining And Rubber Drum Screen In Ball Mills, SAG Mills And AG Mills, And Has Made Significant Technological Breakthroughs And Innovations. China CITIC Heavy Industries And Other Large State-Owned Enterprises Have a Long-Term Strategic Partnership. Mill Rubber Lifter Is Made Of Wear-Resistant Rubber, Which Has Been Proven By Decades Of Mine Use To Withstand The Continuous Impact Of Mine Materials. They Have a Variety Of Shape Designs And Shapes To Choose From, In Order To Provide a Variety Of Mills With More High-Performance Wear-Resistant Accessories. According To Our Rubber Lining Design, Rubber Lifter Can Be Easily Replaced Without Affecting The Shell. Our Mill Lifter Design Is Compatible With Most Shell And End Liner Designs. Performance Characteristics Most Of The First, Second And Third Stage Ball Mills Use Rubber Mill Liner. In Many Cases, Rubber Parts Are Most Suitable For Wear-Resistant Parts Of AG And SAG Mills. Hebei FengMang Technology Co.,Ltd Has Provided Complete Rubber Linings For Some Large Steel Ball Factories Of CITIC Heavy Industries In China And Other Countries. We Provide Rubber Linings For More Than 100 Mines Worldwide. 1, High Wear Resistance And 1.5 Times Longer Service Life Than Metal 2, 8-10 DB Lower Than Metal Noise 3, Light Weight, Easy To Install And Disassemble (It Takes Only 1/3 Of The Time To Install Or Disassemble Metal Bushing) 4, High Cost Performance Ratio Mill Rubber Liner For Ball Mill, AG Mill, SAG Mill Including Of Rubber Discharge End , Rubber Discharge Cone , Rubber Lifter Bar, Rubber Gate Plate , Rubber Feed Element , Rubber Comer Segment , Rubber Shell Liner , Rubber Shell Plate , Rubber Feed End , Rubber Shell Lifter Bar , Rubber Fill Ring , Rubber Pulp Lifter , Rubber Rubber Frame , Rubber Lid Plugs , Rubber Disc Circle , Rubber Center Circle , Rubber Gate Plug Mill Rubber Liner Is Used To Protect The Cylinder From The Direct Impact And Friction Of The Grinding Body And Materials. At The Same Time, Different Forms Of Linings Can Be Used To Adjust The Moving State Of The Grinding Body To Enhance The Grinding Effect Of The Grinding Body On The Material, Which Is Helpful To Improve The Grinding Efficiency Of The Mill, Increase The Output And Reduce The Metal Consumption. Ball Mill Rubber Linings Metal Materials In China Have Been Gradually Replaced By High Wear Resistant Rubber Linings, But With The Continuous Application Of Wear Resistant Rubber Linings In Ball Mill Linings, Metal Linings Have Been Gradually Replaced As The Mainstream Of Market Development. In Addition To Protecting The Cylinder, The Cylinder Rubber Liner Also Has An Effect On The Movement Law Of The Grinding Body. In Order To Meet The Requirements Of Various Working States (Crushing Or Fine Grinding), The Material Of The Shape Of The Rubber Liner Is Also Different. When The Grinding Is The Main, The Lining Should Have a Strong Pushing Ability To The Grinding Body, And At The Same Time, The Lining Should Have Good Impact Resistance. When The Grinding Is The Main, The Protruding Of The Rubber Liner Is Relatively Small, The Pushing Effect On The Grinding Body Is Weak, The Impact Is Small, And The Grinding Effect Is Strong. The Rubber Liner Is Required To Have Good Wear Resistance. Mill Rubber Lining Characteristics 1. High Wear Resistance And Impact Resistance The Rubber Liner With High Wear Resistance And Corrosion Resistance Is Cured By Scientific And Reasonable Formula, Which Makes The Liner Have Good Physical And Chemical Properties, Hardness Between 60 Shore a And 65 Shore a, Impact Toughness Value More Than 25 Joules, Service Life Is More Than 2 Times That Of Polyurethane. Able To Withstand Huge Shocks. In The Work Can Maintain The Surface Shape Of The Liner For a Long Time To Ensure The Mill Stability To Increase The Output By More Than 5%. 2. High Strength And Toughness In The Process Of Using Rubber Liner, Special Rubber With Good Thermal Stability Is Used To Make The Product Achieve High Strength, High Hardness And High Toughness To Meet The Process Requirements Of Wear Resistance. 3. High Cost Performance And Adaptability After Advanced Special Rubber Vulcanization Process Treatment, It Has The Characteristics Of High Hardness And High Toughness Value, Which Makes The Rubber Liner Have Good Wear Resistance. Compared With Polyurethane Liner, The Wear Resistant Rubber Mill Liner Shows Excellent Performance And Price Ratio. Can Adapt To Mine Wet Grinding, Dry Grinding, Mixed Grinding And So On. Ball Mill Rubber Parts Quality As Far As The Wear Property Of Mill Liner Is Concerned, There Are Many Similarities Between Rubber Liner And Polyurethane Liner, But There Are Also Basic Differences. The Main Difference Between Rubber Liner And Polyurethane Liner, In Addition To The Unique Elasticity Of Rubber, Is That It Is Used To Make Wet Mill Liner, Which Is Not Affected By The Corrosion And Wear Of Slurry, And Different Rubber Varieties And Properties Can Obtain Rubber Liner With Different Wear Resistance, Elasticity, Impact Resistance And Chemical Corrosion Resistance To Withstand The Impact And Grinding Of Grinding Medium And Mineral Materials During Grinding. Therefore, Using Rubber To Make Wet Mill Liner, We Should Make Full Use Of This Favorable Characteristic Of Rubber Elasticity, In Order To Achieve The Cushioning Effect Of Liner And Reduce Wear. Using Unique Wet Formula Design, Combined With Nanocomposite Dispersion Technology, We Can Obtain Wet Nano-Rubber With Excellent Performance, Which Has Excellent Wear Resistance, Strength And Elasticity, And Greatly Increases Its Service Life. Experiments Show That When The Impact Speed Is Small, The Liner Has Only Elastic Deformation; When The Impact Speed Is More Than 9 m / s, The Liner Has Surface Damage. Of Course, The Cushioning Effect Of The Rubber Liner Is Also Related To The Impact Angle. When The Impact Angle Is 90, The Cushioning Effect Is The Largest And The Wear Of The Liner Is The Smallest. With The Decrease Of The Impact Angle, The Wear Of The Liner Gradually Increases. Mill Rubber Liner Installation Requirements 1. When The Rubber Liner Is Installed, The Back End Liner And The End Cover Of The Cylinder Shall Be Filled With Cement Mortar Mpa a Compressive Strength Grade 43.5. The Bolts Of The Rubber Liner At The Fixed End Shall Not Be Filled With Cement Mortar And Shall Be Capable Of Turning Or Entering Or Leaving. Rubber Linings Are Usually Directional, So You Must Pay Attention When Installing Them. 4. All Places Where The Arc Length Of The Circumferential Crevice Can Not Exceed 310 Mm, Are Wedged With Steel Plates To Separate Them. The Gap Between Adjacent Linings Is Not Greater Than 3~9 Mm.. 6. a Spacer Shall Be Laid Between The Liner And The Inner Surface Of The Cylinder According To The Design Requirements. If There Is No Requirement, The Compressive Strength Grade 42.5 Mpa Cement Mortar May Be Filled Between The Liner And The Cylinder, As Far As Possible, And The Excess Part Shall Be Squeezed Out By a Strong Liner Bolt, And The Liner Bolt Shall Be Fastened Again After Solidification Of The Cement Mortar. 7. When a Liner With a Rubber Pad Is Installed, The Rolled Rubber Plate Is Opened Three ~ Four Weeks Before Installation To Allow It To Be Freely Elongated; In The Use Of The Rubber Plate, The Long Side Of The Secondary Rubber Plate Follows The Axial Direction Of The Cylinder And The Short Side Follows The Circumferential Direction Of The Cylinder. 8. To Carefully Check The Rubber Liner Bolt Holes And Liner Bolt Geometry, Carefully Clean The Liner Bolt Holes And Liner Bolt On The Flash, Burr, Protruding, So That The Bolt Can Freely Penetrate Into The Required Position. 9. The Complete Set Of Rubber Liner Bolts Shall Consist Of Piercing Bolts, Dust-Proof Washers, Flat Washers, Spring Washers And Nuts; To Prevent Ash Leakage, The Use Of Dust-Proof Pads Shall Not Be Forgotten. 10. Torque Wrenches Shall Be Used To Tighten The Linings And Bolts Of Different Specifications Shall Be Tightened In Accordance With The Corresponding Tightening Torque Requirements.
Correct mill liner selection is, without a doubt, among the most important of your mill components that need to be given careful consideration. Mill liners protect the mill shell from wear and transfer energy to the grinding charge. Careful balance is needed to optimise these differing requirements, as poor liner design has detrimental effects on milling performance and on mill liner life.
Mill linersdeveloped by Multotec includeBall Mill Liners,SAG Mill Liners,AG Mill Liners, as well asScrubber Liners. Focusing on good fitment of liners, in which Multotec are experts, results in reduced installation downtime which, in turn, facilitates increased production.
To ensure mill liners fromMultotecachieve your application-specific milling objectives, ourresearch and developmentis conducted to maintain exceptional quality, high performance standards and high levels of product consistency and reliability. In fact, the rubber compound used in Multotecs mill liner components is formulated to provide a combination of good impact, cut and abrasion resistance.
To select the correct materials of construction, a combination of the applications function, ore abrasivity, mill size, mill speed size of the balls and the type of corrosive environment need to be considered. Symptoms of poor liner design, which means your mill liner may require re-evaluation, include a noisy mill and broken mill liners. A noisy mill produces a distinct impact rattling, which indicates that the grinding media is impacting directly on the liner instead of on the toe of the grinding charge. A broken liner, which is particularly severe for large AG/SAG mills, can arise from media impacting directly on the mill liner. Multotecs rubber mill linings are designed by combining the results of computer simulations and inspection data in order to optimise charge trajectory and wear life. The mill liner components are available in a wide range of designs, dimensions and profiles. In addition to the standard rubber components, we also supply MultoMet composite lifter bars, shell plates and head plates.
To ensure our customers get the best solution for their requirements, Multotec installation teams supervise, assist and undertake complete lining installations. Stock control assistance andcondition monitoringare also provided.
*Acknowledgments to Malcolm Powell, Ian Smit, Peter Radziszewski, Paul Cleary, Bruce Rattray, Klas-Goran Eriksson and Leon Schaeffer for some of the information in this article, which has been extracted from their paper The Selection and Design of Mill Liners. The full document can be accessed atThe selection and design of mill liners
Qiming Machinery is one of the largest ball mill liner manufacturers in China. Qiming Machinerys ball mill liners are tailor-made and developed in close collaboration with our customers. Being the pioneer, Qiming Machinery ball mill liners are designed and produced based on the worlds largest bank of know-how and experience. As a result, they last longer, and your mill availability increases.
As a casting foundry, Qiming Machinery can supply various materials and different types to suit different working conditions and requirements. No matter which material you want, no matter which liner type you need, contact Qiming Machinery is your right choice.
The ball mill liner is used to protect the cylinder body from direct impact and friction of the grinding body and the material. At the same time, different forms of mill liner can be used to adjust the movement state of the grinding body to enhance the grinding effect of the grinding body on the material, Help to improve the grinding efficiency of the mill, increase production and reduce metal consumption.
The manganese content of the high manganese steel ball mill lining plate is generally 11-14%, and the carbon content is generally 0.90-1.50%, most of which are above 1.0%. At low impact loads, the hardness can reach HB300-400. At high impact loads, the hardness can reach HB500-800. Depending on the impact load, the depth of the hardened layer can reach 10-20mm. The hardened layer with high hardness can resist impact and reduce abrasive wear. High manganese steel has excellent anti-wear performance under the condition of strong impact abrasive wear, so it is often used in wear-resistant parts of mining, construction materials, thermal power, and other mechanical equipment. Under the conditions of low impact conditions, high manganese steel cannot exert the characteristics of the material because the work hardening effect is not obvious.
Chromium alloy cast iron is divided into high chromium alloy cast iron (chromium content 8-26% carbon content 2.0-3.6%), medium chromium alloy cast iron (chromium content 4-6%, carbon content 2.0-3.2%), low chromium Three types of alloy cast iron (chromium content 1-3%, carbon content 2.1-3.6%). Its remarkable feature is that the microhardness of M7C3 eutectic carbide is HV1300-1800, which is distributed in the form of a broken network and isolated on the martensite (the hardest structure in the metal matrix) matrix, reducing the cleavage effect on the matrix. Therefore, the high-chromium alloy liner has high strength, ball mill toughness, and high wear resistance, and its performance represents the highest level of current metal wear-resistant materials.
Qiming Machinery uses Cr-Mo alloy steel to cast ball mill liner. This material based on Australia standard, (AS2074 Standard L2B, and AS2074 Standard L2Cits provides superior impact and wear resistance in all semi-autogenous milling applications.
Ni-Hard is a white cast iron, alloyed with nickel and chromium suitable for low impact, sliding abrasion for both wet and dry applications. Ni-Hard is an extremely wear-resistant material, cast in forms and shapes which are ideal for use in abrasive and wear environments and applications.
Qiming Machinery is the leading manganese steel, chromium steel, alloy steel, and heat-resisting steel manufacturer in China. We manufacture crusher wear parts, shredder wear parts, mill liners, apron feeder pans, and other wear parts for customers.
The Lining Plate Of Ball Mill Is Gradually Replaced By Rubber And Polyurethane Lining Plate In China, But With The Continuous Application Of Rubber Polyurethane Lining Plate In The Lining Plate Of Ball Mill, It Has Gradually Replaced Manganese Steel And Other Lining Plates And Become The Mainstream Of Market Development.
Ball Mill Liner ( Rubber , Polyurethane ) | Mill Rubber Linings Plate Parts Ball Mill Liner Plate Of Is Used To Protect The Cylinder From The Direct Impact And Friction Of The Grinding Body And Materials. At The Same Time, Different Liner Plates Can Be Used To Adjust The Movement State Of The Grinding Body, So As To Enhance The Grinding Effect Of The Grinding Body On The Materials, Improve The Grinding Efficiency Of The Mill, Increase The Output And Reduce The Metal Consumption. Our Company Mainly Provides Rubber Ball Mill Liner And Polyurethane Mill Liner . In Addition To Protecting The Cylinder, The Liner Plate Of The Cylinder Also Affects The Movement Law Of The Grinding Body. In Order To Meet The Requirements Of Different Working Conditions (Grinding Or Fine Grinding), The Shape Of The Rubber Liner Plate Is Different. When Grinding Is The Main Method, The Liner Of The Ball Mill Is Required To Have a Strong Ability To Push The Abrasive Body, And The Liner Should Have a Good Impact Resistance. When Grinding Is The Main Method, The Protrusion Of The Liner Is Relatively Small, The Pushing Effect On The Abrasive Body Is Weak, The Impact Is Small, And The Grinding Effect Is Strong. The Lining Plate Is Required To Have Good Wear Resistance. Characteristic 1. High Wear Resistance And Impact Resistance The Wear-Resistant Rubber Adopts Special Formula, Which Makes The Rubber Lining Plate Have Good Physical And Chemical Properties. The Hardness Is More Than 60shore a, The Impact Toughness Value Is More Than 25J, And The Service Life Is More Than 2 Times Of That Of The Metal Lining Plate. Able To Withstand Huge Impact. It Can Keep The Surface Shape Of Liner Plate For a Long Time In Order To Increase The Output Of Mill More Than 5% 2. High Strength And Toughness After Being Processed By The Heat Vulcanization Process, The Lining Plate Of Rubber Ball Mill Adopts The Special Rubber Vulcanization Function With Good Heat Stability, So That The Product Can Achieve The Coordination Of High Strength, High Hardness And High Toughness, So As To Meet The Process Requirements Of Wear Resistance 3. High Cost Performance And Strong Adaptability After Being Treated By Advanced Flat Vulcanizer, It Has The Characteristics Of High Elasticity And Strong Hardness, Which Makes The Lining Plate Of The Ball Mill Have Good Wear Resistance. Compared With High Manganese Steel Lining Plate, The Wear-Resistant Rubber Lining Plate And Polyurethane Ball Mill Lining Plate Show Excellent Cost Performance. It Can Be Used In Wet Grinding, Dry Grinding, Mixed Grinding, Etc. Specifications The Size Of The Lining Plate Of The Ball Mill Should Consider The Factors Such As The Convenience Of Handling, Loading And Unloading, And Entering And Leaving The Grinding Door. In Recent Years, The Size Of The Lining Plate Of The Ball Mill Has Been Unified, The Width Is 314mm, The Length Of The Whole Lining Plate Is 500mm, The Half Lining Plate Is 250mm, The Thickness Is 40-50mm, And The Mass Is About 45-55kg. Correlation Comparison According To The Test Comparison Between Rubber Liner And Polyurethane Liner, The Economic Effect Of Using Rubber Liner In Wet Mill Is Better Than That Of Polyurethane Liner. 1. Good Abrasiveness And Long Service Life In The Process Of Wet Grinding, The Wear Form Of The Alloy Liner Plate Of The Mill Is The Result Of The Comprehensive Action Of Impact, Fatigue, Grinding And Corrosion Wear, Especially The Corrosion Wear. The Rubber Lining Has Good Corrosion And Wear Resistance, So It Shows Good Wear Resistance In Wet Grinding Production, And Its Service Life Is Generally Higher Than That Of Alloy Lining. The Test Results Show That The Service Life Of Rubber Lining Is 2 ~ 4 Times Longer Than That Of Alloy Lining. Of Course, The Difference Of Service Life Between Different Grinding Methods And Conditions Is Obvious. In The First Stage Mill, The Service Life Of Rubber Liner Is Only 0.5 Times Longer Than That Of High Manganese Steel Liner. In The Second Stage Mill, The Service Life Of Rubber Liner Is 2-3 Times Longer Than That Of High Manganese Steel Liner. 2. Reduce Grinding Energy Consumption And Improve Energy Efficiency The Power Consumption Of Ore Dressing Plant Is Very Large, And The Power Consumption Of Ore Crushing, Especially Grinding Operation Accounts For About Half Of It. With The Rapid Increase Of Energy Price And The Demand Of Economic Grinding, The Key Point Of Grinding Production Is To Maximize The Production Capacity Of Grinding Equipment And Reduce The Power Consumption Of Unit Product To Improve The Energy Efficiency Of Grinding. The Production Practice Shows That The Rubber Lining Plate Grinding Machine Has Shown a Unique Energy-Saving Benefit In This Respect, And The Unit Power Consumption Of Grinding Has a Significant Reduction Trend, Which Can Generally Be Reduced By 10%-15% In China. Some Of Them Have a Large Reduction. 3. Reduce Production Noise And Improve Grinding Environment The Production Noise Of Manganese Steel Liner Mill Is Very Large, The Noise Of Ball Mill Is Generally 110 Db, And The Noise Of Ore Autogenous Mill Is About 105 Db. All Of These Greatly Exceed The Noise Level Stipulated By Environmental Protection Regulations And Seriously Damage The Hearing Health Of Workers. Due To The Damping And Absorption Effect Of Rubber Lining, The Sound Insulation Effect Is Better, And The Grinding Production Noise Is Reduced, Especially The High-Frequency Noise Which Endangers The Hearing Is More Significant. According To The Actual Measurement Results, The Production Noise Of The Rubber Lined Plate Mill In China Has Been Reduced By About 10-15 Decibels, The Working Environment Of The Grinding Workshop Has Been Improved, And The Physical And Mental Health Of The Workers Has Been Improved. 4. The Lining Plate Is Very Light To Avoid Dangerous Accidents, The Rubber Lining Board Is Light, 50-85% Lighter Than The High Manganese Steel Lining Board. The Weight Of a High Manganese Steel Lining Plate Is Generally About 50 Kg, And The Maximum Weight Is 120 Kg, While The Single Rubber Lining Plate Is Only 15-20 Kg, Which Reduces The Labor Intensity Of Maintenance Lining Plate And Avoids The Dangerous Accident Of Loading And Unloading Lining Plate, So It Is Welcomed By Workers. In Addition, Rubber Is An Elastomer. The Castor Hole Of The Rubber Grid Plate Of The Mill Is Basically Not Blocked, And There Is No Need To Stop Grinding For Cleaning. The Barrel Of The Rubber Liner Mill Does Not Leak Slurry, So There Is No Need To Stop Grinding For Inspection And Repair, Thus Reducing The Time Of Stopping Grinding And Improving The Capacity Of The Mill. Quality In Terms Of The Wear Properties Of Mill Liner, There Are Many Similarities Between Rubber Liner And Manganese Steel Liner, But There Are Also Basic Differences. The Main Difference Between Rubber Liner And Manganese Steel Liner Is That, In Addition To The Unique Elasticity Of Rubber, It Can Be Used To Make Wet Mill Liner, Which Is Not Affected By The Corrosion And Wear Of Slurry, And Different Rubber Varieties And Properties Can Obtain Rubber Liner With Different Wear Resistance, Elasticity, Impact Resistance And Chemical Corrosion Resistance, So As To Bear The Grinding Medium And Mineral Materials In The Grinding Process Impact And Abrasive Action. Therefore, When Using Rubber To Make Wet Mill Liner, We Should Make Full Use Of This Favorable Characteristic Of Rubber Elasticity To Achieve The Cushion Effect Of Liner And Reduce Wear. With a Unique Wet Formula Design, Combined With Nano Composite Dispersion Technology, We Can Get Wet Nano Rubber With Excellent Performance, Which Has Excellent Wear Resistance, Strength And Elasticity, And Greatly Increases Service Life. The Experimental Results Show That When The Impact Velocity Is Small, The Liner Has Only Elastic Deformation; When The Impact Velocity Is Greater Than 9 m / s, The Liner Will Have Surface Damage. Of Course, The Buffering Effect Of The Rubber Lining Is Also Related To The Impact Angle. When The Impact Angle Is 90 , The Buffering Effect Is The Largest And The Lining Wear Is The Smallest. With The Decrease Of The Impact Angle, The Lining Wear Increases Gradually. Installation Requirements 1. The Space Between The Rear End Lining Plate And The End Cover Of The Cylinder Shall Be Filled With 43.5mpa Cement Mortar With Compressive Strength. 2. The Bolts For Fixing The End Lining Plate Shall Not Be Allowed To Be Grouted With Cement Mortar, And Shall Be Able To Rotate Or Move In And Out. 3. The Lining Plate Is Generally Directional, So Attention Shall Be Paid To It During Installation, And It Shall Not Be Reversed. 4, The Arc Length Of All Circumferential Cracks Shall Not Exceed 310mm, And Steel Plates Shall Be Used To Wedge In The Places Beyond To Block Them. The Clearance Between Adjacent Lining Plates Shall Not Be Greater Than 3-9mm. 6. The Partition Layer Shall Be Laid Between The Lining Plate And The Inner Surface Of The Cylinder According To The Design Requirements. If There Is No Requirement, The Cement Mortar With Compressive Strength Grade Of 42.5mpa Can Be Filled Between The Two, And The Excess Part Shall Be Extruded Through The Solid Lining Plate Bolt. After The Cement Mortar Is Solidified, The Lining Plate Bolt Shall Be Tightened Again. 7, When Installing The Lining Plate With Rubber Base Plate, Open The Rolled Rubber Plate 3-4 Weeks Before Installation To Make It Stretch Freely; When Using The Rubber Plate, The Long Side Of The Secondary Rubber Plate Shall Follow The Axial Direction Of The Cylinder, And The Short Side Shall Follow The Circumferential Direction Of The Cylinder. 8. Carefully Check The Liner Bolt Hole And Liner Bolt Geometry, Carefully Clean The Flash, Burr And Protrusion On The Liner Bolt Hole And Liner Bolt, So That The Bolt Can Freely Penetrate Into The Required Position. 9, The Complete Set Of Lining Plate Bolts Shall Be Composed Of Eye Piercing Bolts, Dust-Proof Washers, Flat Washers, Spring Washers And Nuts; In Order To Prevent Dust Leakage, Do Not Forget To Use Dust-Proof Pads When Using. 10, Torque Wrench Shall Be Used To Fasten Lining Plate Bolts, And Lining Plate Bolts Of Different Specifications Shall Be Tightened According To Corresponding Tightening Torque Requirements.
JinRuiDa Industry Solution Co.,Ltd as for Famous Mining EPC(Engineering Procurement Construction) Company, We already help Many Project Owner solute their Rubber Lined Pipe Problem. Our business including help Owner Engineering and offer our production. We Are Also The Biggest Polyurethane Lined Pipe Manufacture In China
Mining businesses need to be able to rely on productive milling operations, built on todays most advanced equipment and expert process know-how. FLSmidth serves the global mining industry as a leading original equipment manufacturer (OEM) supplier of engineering, equipment and service solutions. Todays mill liner customers depend on FLSmidth for safe, efficient milling equipment solutions. Our range of proven mill liners is ideal for the full scope of mill brands currently available in the market.
Mill liners fill a basic role: to protect your mills from the intensewear and tear that comes from grinding down hard, rawmaterials. But even if they all do the same job, not all mill linersare created equal. From the abrasion resistance of rubber to theimpact resistance of steel, different material parts offer differentadvantages. FLSmidth supplies the full range of mill linersoptions, including composite, steel and rubber liner solutions.
Utilising new technologies, the designs of our mill liners are improved to increase safety and allow more accurate planning of their useful life. The material used in manufacturing the liners and lifters has been engineered to optimise operational conditions and in accordance with mineral characteristics.
Safety is crucial. Our mill liners are safe and have fewer parts and are therefore quicker to install. That means less downtime. It also means workers installing the liners or lifters spend less time in a potentially hazardous situation.
You need optimal solutions that provide increased safety and throughput. Our mill liners aredesigned with you in mind. PulpMax Composite Mill Liners are high-performance lightweight millliners uniquely constructed with a rubber, ceramic matrix, and carefully selected high-hardnesssteel inserts. Designed for a number of minerals processing applications, they are customisableto fit the specifications of your SAG or ball mill.
FLSmidth provides sustainable productivity to the global mining and cement industries. We deliver market-leading engineering, equipment and service solutions that enable our customers to improve performance, drive down costs and reduce environmental impact. Our operations span the globe and we are close to 10,200 employees, present in more than 60 countries. In 2020, FLSmidth generated revenue of DKK 16.4 billion. MissionZero is our sustainability ambition towards zero emissions in mining and cement by 2030.
Built to last longer and occupy less volume within your mill. A longer lasting mill liner means less downtime for maintenance or new liner installation. A mill liner that occupies less space allows increased volume within the mill and leads to greater grinding capacity and throughput potential.
50% lighter and have 50% fewer parts on average when compared to traditional cast steel liners. This results in faster relining and quicker installation, keeping your workers inside a hazardous work environment for a shorter time period. The liners are easy to remove and dont require the use of dangerous equipment like thermal lances. This not only enhances worker safety, but also keeps your mine assets free from potential damage and risk caused by removal equipment.
Built with high-abrasion and impact-resistant materials.Manufactured to meet your plants unique operational conditions and ore characteristics, the liners are engineered to last longer. This allows you to extend periods between scheduled maintenance times.
In addition to being the OEM supplier of composite, cast steel, and rubber mill liners, we provide the process know-how and service today's mining operations need for peak productivity. With over 135 years of experience in helping customers achieve their goals, let us improve your milling with:
FLSmidth provides sustainable productivity to the global mining and cement industries. We deliver market-leading engineering, equipment and service solutions that enable our customers to improve performance, drive down costs and reduce environmental impact. Our operations span the globe and we are close to 10,200 employees, present in more than 60 countries. In 2020, FLSmidth generated revenue of DKK 16.4 billion. MissionZero is our sustainability ambition towards zero emissions in mining and cement by 2030.
Qiming Machinery is a leader in the design, manufacture, and supply of mill liners for mineral processing and quarrying industries. We offer our customers complete wear liner solutions for mills that increase performance, equipment availability, and lower maintenance costs. Our mill liners are also tested to withstand the acidity level of different elements that may be present in the milling process. Longer milling life to your machine means fewer expenses and more profit or income to your company.
Qiming Machinery mill liners are subjected to different combinations of impact and abrasion, as they are used in SAG/AG, ball or rod mills. Our wear parts are manufactured to the highest standards of quality and delivery, ensuring high levels of reliability for our customers. Also, our mill liners wear parts that add value to customers processes through customized designs.
When choosing any type of mill liners for your mill plants, think long-term. Qiming Machinerys parts help keep your mill plants working at peak performance because they are made to fit and function for just that.
SAG is an acronym for semi-autogenous grinding. SAG mills are autogenous mills that also use grinding balls like a ball mill. SAG mill is usually used to grind large pieces into small pieces, especially for the pre-processing of grinding circuits, thus also known as primary stage grinding machine.
AG is short for the autogenous mill. it combines with two functions of crushing and grinding, uses the ground material itself as the grinding media, through the mutual impact and grinding action to gradually reduce the material size.
Ball mill is a fine grinder. A horizontal or vertical rotating cylinder is filled partially with the balls of ceramics, small rocks, and balls made from stainless steel. The ball charge of a SAG mill is about 29% to 30%. By friction and influence of tumbling balls inside the rotating cylinder grinds the raw material to the required fineness. The internal machinery of the ball mill grinds the raw material into the powder-like material, And if extreme fineness and refinery are required then rotation goes on to continue.
The role of a ball mill liner is to give the mill heads protection against wear and tear thus increasing their lifetime and creating optimal grinding efficiency. Qiming Machinery can design and supply mill liners for all types of ball mill.
Rod mills are very similar to ball mills, except they use long rods for grinding media. The rods grind the ore by tumbling within the mill, similar to the grinding balls in a ball mill. To prevent the conditions leading to rod charge tangling, the length to diameter ratio is maintained at 1.4 to 1.6. Rod mills accept feed up to about 50 mm (2 in.) and produce a product in the size range of 3000 to 270 mm (4 to 35 mesh). Grinding action is by line contact between the rods extending the length of the mill. Rods tumble and spin in roughly parallel alignment simulating a series of roll crushers. This results in preferential grinding of coarse material and minimizes the production of slimes.
This is used for grid liners and generally smaller mills. Its great advantage is that it works hardens under stress, yet the substrate remains tough and can withstand extreme impact without fracture. Its primary disadvantage is that it spreads with impact, so solid liners begin to squeeze together and become extremely difficult to remove, and can damage a mill shell if the stress is allowed to build up to an extreme level.
Low Carbon Chrome Moly Steel (300 to 370BHN):Was generally used for mill liners (AG, SAG, and Ball) prior to the movement to higher carbon content steels. It has excellent wear characteristics with some impact resistance, generally now used for discharge grates where slightly better impact resistance is required compared to the higher carbon chrome-moly steels or for thinner section liners.
High Carbon Chrome Moly Steel (325 to 380BHN):This steel is now considered the main material used for SAG mill liners. There are a number of variations with either different carbon or chrome contents. The variations tend to have a bearing on the size of the liner and its section thickness. There is ongoing development within this area as the size of the liners is outstripping the properties provided by the standard high chrome-moly steels.
Chrome Moly White Irons (600 to 700BHN) WI:This casting material is considered to be the ultimate developed and used to date for abrasion resistance in Milling. It is commonly used in cement mills and some of the largest Ball Mills in the world and where performance has not been bettered to date.
The use of this type of material generally began with Rod Mills and Ball Mills, where impacts were considered low enough for this brittle yet highly abrasive resistant wear material to perform well. However, it is now considered obsolete in light of the use of high chrome irons and chrome-moly white iron.
High chromium alloy cast iron generally refers to the alloy white cast iron with the chromium content of 12% 30% and carbon content of 2.4% 3.6%. It is characterized by the microhardness hv1300 1800 of M7C3 eutectic carbide, which is dispersed on the matrix of martensite (the hardest structure in the metal matrix) in the form of a broken network and isolated shape, which reduces the splitting effect on the matrix.
Qiming Machinery is the leading manganese steel, chromium steel, alloy steel, and heat-resisting steel manufacturer in China. We manufacture crusher wear parts, shredder wear parts, mill liners, apron feeder pans, and other wear parts for customers.Get in Touch with Mechanic