YGM high pressure micro powder mill is referred to as micro powder mill or super fine grinding mill. The high pressure micro grinder is mainly used for the ultra-fine powder processing of more than 500 kinds of materials, such as feldspar, talc, barite, marble, limestone, carbon black and clay. The fineness is between 80 mesh (0.19mm) and 425 mesh (0.033mm), and the finest powder is 500 mesh ( 0.025mm).
High Pressure Spring, Strong Grinding Force Compared with YGM high pressure grinder, the grinding force of YGM high pressure ultrafine grinders roller to material is increased by 800-1200 kg under the function of high pressure spring. Big Input Size, High Output Fineness Big input size, average output size could be 6.5 um. Energy-efficient In the condition of same capacity and fineness, energy consumption is 1/3 of jet mills. Seal Grinding Eclipsed form multiple seal grinding device with perfect seal.
Inside the host of the high-pressure grinder, a 1000-1500 kg high pressure spring is fastened on the roller hanger. After starting work, the grinding roller revolves around the spindle, and under the action of high-pressure spring and centrifugal force, rollers close to the grinding ring. The rolling pressure is 1.2 times higher than Raymond mill under the same power condition, so the capacity is greatly increased. When the grinding material enters the chamber, it is shoveled by a spade and fed into the grinding roller and the grinding ring for rolling. The powder after rolling is brought into the analyzer with the circulating air of the blower. The qualified fine powder enters the cyclone collector with the air flow, and the large particles fall back to grinding. The recirculating air returns to the blower to repeat the above process and the remaining wind enters the bag filter to purify. When grinding roller and ring reach a certain wear, adjust the length of the high-pressure spring to maintain a constant grinding pressure between the roller and the ring, so as to ensure stable capacity and fineness.
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HPGR orhigh-pressure grinding rolls have made broad advances into nonferrous metal mining. The technology is now widely viewed as a primary milling alternative, and there arc a number of large installations commissioned in recent years. After these developments, an HPGR based circuit configuration would often be the base case for certain ore types, such as very hard, abrasive ores.
Though long established in the cement industry, penetration to the hard-rock mining industry was slow , and hampered by high maintenance requirements both for wear surfaces in general, and in particular, high wear on the edge of rolls. HPGRs first made inroads into diamond processing (where rock fracture along grain lines favored a reduction in diamond breakage during comminution), and in the iron-ore industry. Over the course of the past 20 years. HPGR based circuits have become a circuit commonly evaluated, and there are now many circuits in operation.
This industry acceptance has been based on a reduction in the level of overall maintenance effort, an increase in the available size of the units, and the unit operations ability to improve overall comminution efficiency (particularly for harder ore types that can be problematic in a typical SAG circuit). Improvements to wear life and overall availability decreased the overall maintenance effort required. Incorporation of studs on the surface of rolls to allow formation of autogenous wear surfaces, and implementing edge blocks of a long-wearing material for edge protection, have allowed HPGRs to break into the mainstream of mineral processing. These wear-retarding innovations were the focal point of a full-scale trial at Lone Tree (Seidel ct al., 2006). Successful completion of this trial marked somewhat of a turning point in interest in HPGRs for hard-rock applications. Manufacturers have also paid special attention to the bearings, wear surfaces, and the handling of tramp metal through the rolls to improve operational reliability, reduce maintenance, and obtain longer service lives.
The most common HPGRbased circuit involves feeding primary crusher product to a secondary crushing circuit with of cone crushers in closed circuit with screens, followed by tertiary crushing with HPGRs, also operating in closed circuit with screens. The product of these two stages of crushing and screening then passes to secondary milling. In hard-rock metals mining applications, HPGRs are currently in use in tertiary and quaternary crushing applications, as well as in secondary pebble crushing. In many respects, HPGRs replace crushers as a unit operation.
However, from a process standpoint. HPGRs produce a product with substantially more lines (for a given P80) than a crushing circuit. In this regard, the size distribution of an HPGR circuit is much more similar to the product of an SAG circuit than a conventional crushing circuit, reducing the amount of power in the ball-mill circuit required (relative to a crushing circuit).
While HPGRs replace crushing as a unit operation, they represent a much larger installation of power in a given footprint relative to conventional crushers. As such, larger single-line capacities relative to a conventional crushing circuit can he attained. Freeport McMoRans (Freeport) Cerro Verde operation was a ground-breaking installation in that a combination of secondary crushing (using MP1000s), tertiary crushing using HPGRs, and screens replaced what would have been more typically been a large SAG mill feeding a multiple ball-mill circuit (Vanderbeek, 2006). The circuit, commissioned in 2006. was a significant step, and presented an alternative to conventional crushing plants or AG/SAG milling for primary milling applications (see Figure 17.10). Indeed, among the lessons learned for the Cerro Verde circuit w ere techniques to address rolls w ear, maintenance techniques, and elements of the art of operating a comminution circuit of this configuration (Koski et al., 2011).
Newmont Mining Companys Boddington gold project followed on the heels of the Cerro Verde project and, after considerable care and study, selected HPGR comminution, with circuit commissioning in 2009 (Hart et al.. 2011). Using Boddington as a reference for comparing an SAG-based circuit to the selected HPGR-based circuit was widely documented in the literature. The project was commissioned with a similar comminution flowsheet to the Cerro Verde (and also employing four 2.4 x 1.7-m units).
A Cerro Verde expansion used a similar flowsheet as the 2006-commissioned circuit to triple circuit capacity. The expansion circuit includes eight MP1250 cone crushers, eight HPGRs (also 2.4 x 1.7-m units, with 5 MW each), and six ball mills (22 MW each), for installed comminution power of 180 MW. and a nameplate capacity of 240,000 tpd. The expansion circuit was under commissioning and ramp-up in Q4. 2015; combined, the original and expansion Cerro Verde HPGR-based circuits are the largest throughput mill in world.
Like trends in mills, larger equipment sizes continue to evolve. Freeports Morenci operation, for example, commissioned a 3.0 x 2.0-m Metso HPGR (called the hydraulic rolls crusher, or HRC) in an expansion mill circuit in 2014. The circuit has a single-line capacity of over 60,000 tpd. with the single HRC having 11.4 MW of installed power, and operating in conjunction with twin MP1250 cone crushers to feed twin 24 x 40-feet ball mills (26 MW for each of installed power). This single-line capacity approaches that of the larger SAG circuits, with a substantially reduced number of material handling units (feeders, conveyors, screens, chutes) relative to a typical crushing plant, and a more straight-forward plant layout. Notably, the HPGR in this installation (the Metso HRC) made a substantial step forward in process performance with a flanged roll set, w hich eliminates material bypassing the full crushing effect on the edge of rolls, as well as other innovations.
Of note, an HPGR circuits mode of operation is fundamentally different to that of SAG mill. As a largely volumetric machine, the comminution specific energy in an HPGR is a function of the power drawn by the machine at a given rolls pressure setting, divided by the throughput. This has two related effects: firstly, HPGR throughput has relatively little variation based on ore hardness, but it also implies that the specific power input for the HPGR stage is also relatively fixed. As a result, for harder ore types, the product of the HPGR circuit the grind coarsens with harder ore at equivalent throughput. This is typically a positive effect relative to an SAG circuit (where throughput drops with harder ore. but typically achieving an overall finer grind)a coarser grind typically has less impact on revenue (based on a shift on the grindrecover) curve) than a drop in throughput for an SAG circuit. Stated another way, HPGR circuits aremore accommodating of ore variability. Amelunxen et al. (2011) captured this impact well, and converted this variability to NPV estimates relative to an SAG mill circuit (assuming that the SAG was designed based on median ore hardness). Sizing of the secondary milling circuit needs to consider this variability in comminution response in primary milling.
The wear on a rolls surface is a function of the ores abrasivity. Increasing roll speed or pressure increases wear with a given material. Studs allowing the formation of an autogenous wear layer, edge blocks, and cheek plates. Development in these areas continues, with examples including profiling of stud hardness to minimize the bathtub effect (wear of the center of the rolls more rapidly than the outer areas), low-profile edge blocks for installation on worn tires, and improvements in both design and wear materials for cheek plates. As mentioned, the HRC technology takes a different approach through the use of a flanged roll, which in turn also reduces edge wear.
HPGRs typically operate with improved comminution efficiency relative to rotating millsthis effect is typically more pronounced with harder ore types. Also. HPGRs improve observed downstream comminution efficiency. This is attributable to both increased fines generation (which can be corrected for mathematically, as this portion of comminution w ork is actually done by the HPGR. and not downstream unit operation), but also due to what appears to be weakening of the ore. which many researchers attribute to micro-cracking. This effect has been observed by the author in both well-controlled (and fincs-corrected) laboratory tests, and also in plant trials, as well as by other operators and researchers. A typical HPGR-circuit product approaches the lines generation of an SAG-circuit product, both with markedly more fines than a crushing circuit.
Of note is that while the HPGR improves comminution efficiency, the savings in overall circuit power requirements can be reduced or even negated by an increase in conveying and pumping costs relative to large single-line SAG circuits. Put simply, some of the power savings of more efficient comminution is used to transport material through the various unit operations of crushing, HPGR milling, and screening.
Media wear is much less than an SAG circuit in terms of total volume (balls and liners) or as unit consumption in terms of kg/kWh or kg/t. However, although the volume is less, the wear materials are much more highly finishedin economic terms, a high-volume. lower value media is replaced by a low-volume. higher value media. The cost is materials is therefore canceling to a greater or lesser extent. On the other hand, the savings in transport and logistics costs for the reduced volume can be substantial.
A number of trade-off study papers have been published. Very generally, such trade-offs often pit the higher capital cost of an HPGR circuit (with additional unit operations, bells, etc.) to lower comminution energy costs (based on higher comminution efficiency) relative to an SAG circuit. During studies of the Boddington project, comminution power efficiency gain was somewhat offset by increased power for additional conveying and screening units, for an overall net 5% decrease in unit power required for the circuit (Seidel et al., 2006). While the magnitude of the observed power efficiency benefit varies. HPGR circuits demonstrate a consistent benefit, which tends to be more marked for harder ores. Considerations in these trade-off studies also consider the differences in media consumption and overall circuit (not solely comminution) power requirements.
In summary, and relative to an SAG mill primary circuit, HPGRs appear to be most attractive with hard and abrasive ores, and in environments with high power costs. Availabilities are now such that aside from rolls change-outs, which are akin to a mill liner change, the unit rarely controls circuit availability. Overall single-line availabilities comparable to SAG milling can be attained.
HPGR is typically used in a third-stage or fourth-stage crushing application ahead of grinding. You could always try to build a circuit doing 45 m classification, but I suspect your circulating load would be overwhelming. Most HPGR applications in hard rock mining achieve 3000 m to 7000 m product
The largest HPGR Polycom in operation (Figure 5) using a maximum roll diameter of 2.2 meters is processing diamond-bearing rocks in Australia at a maximum feed rate of 600 to 800 mt/h with a top feed size of 150 millimeter (6). This rock material is reduced in one pass to 57% -1 millimeter with a power input of less than 3 kWh/mt.
Polycom HPGR offers particular improvements in the early physical recovery of coarse gold and gold-bearing sulfides through the addition of a PGF Circuit (i.e., Polycom Gravity Separation Flash Flotation).
The Polycom HPGR provides an easy and fast adaptation for throughput and product size through pushbutton changes of the hydraulic pressure. Constant product fineness can be maintained even when variations in ore grindability occur. This is of particular importance to gold operations where variations in particle size of gold and gold-bearing sulfides, silicification, changing rock types or other alteration features present challenges to conventional grinding circuits.
Following are several options for the use of the Polycom high-pressure grinding roll for optimization of gold ore comminution circuits. Specifically the increasing significance of whole ore oxidation treatments of refractory ores will require cost-efficient and optimal liberation of ultrafine precious metals mineralizations.
Additional options for high-pressure grinding roll use in gold ore comminution circuits are illustrated in Figure 11. As indicated by Kapur et al. (1992), high-pressure roll grinding is likely to replace ball mills in increasing numbers in the near future.
Krupp Polysius has developed a rapid and effective test for evaluating a gold ores amenability to high-pressure grinding. All test products are subjected to cyanide leach tests and mineralogical analysis to provide optimal performance data and recommendations for pilot plant work, scale-up and/or plant operation.
The F-series HPGR, developed by FLSmidth, incorporates a combination of engineered solutions and optimised components. Our design is derived from our years of maintaining these machines in the field and aimed at decreasing maintenance downtime, while placing special emphasis on the health and safety aspects of these operations.
Our HPGR is flexible enough to be highly suitable for both brownfield expansions and greenfield installations. The wide variety of ways our customers are already using the machine shows just how helpful the technology is.
Our HPGR is a perfect complementary tool to work in conjunction with, and even enhance the performance of traditional grinding mills and fixed-gap crushers. The HPGR exposes feed material to very high pressure for a short amount of time. The compression typically causes the rock to crack and cleave along the grain boundaries, weakening the rock structure and exposing the ore particles. This high pressure also creates a large amount of fines and causes the formation of microcracks in the larger particles, lowering the Bond work index of the ore and reducing the ball mill power required downstream.
The F-Series HPGR is ourfull size machine used in large mining projects throughout the world. Operation, maintenance and service personnel collaborated to create this modern HPGR design. With it, you get a reduced footprint, convenient and safe handling for heavy components and improved shipping.
We re-designed our legacy roll press to upgrade it and optimise it for mining duty, and the result is our S-Series HPGR. Though this series is meant for smaller projects, plants and retrofits, it is packed with plenty of the same features that are in our larger models. And the smaller size means that your machine can be shipped partially or fully assembled, resulting in a faster installation.
The lower section of our HPGR feed chute, which typically experiences the highest wear, is lined with FLSmidths patented FerroCer Impact Wear Panels. Our wear panels haveproven to greatly outperform conventional wear plates in this application where the feed ore is often large, very hard, and highly abrasive. These panels are easy and safe to install, while providing the longest possible wear life. Learn more about where else in your plant operation you can optimize your durability with FerroCer Impact Wear Panels.
The planetary reducers are shaft mounted to the rolls and are linked together via the torque sharing arm assembly. This saves you money because it eliminates the cost of additional foundation structure and hardware to bear the torque arm reaction forces.
This feature also allows the drive train to be captured and held in place during roll change-out using our (optional) drive retraction cradle, which further optimises the roll change-out time and makes the procedure safer.
Mounting the hydraulic cylinders to the frame with hinges allows maintenance personnel to safely access and inspect these components without getting inside the framework of the HPGR. For any maintenance that required removing the cylinders, overhead access is free and clear of the frame with the hinges in the outboard position. Dual-acting means that no special tools are required to separate the rolls to clear tramp metal. By simply reversing the oil flow, the hydraulic cylinders can be used to retract the rolls and allow the tramp to fall through, getting the machine back online quickly.
The HPGR has a skid mounted tank with a lubrication oil conditioning system that supplies clean filtered and temperature conditioned oil to the roll bearings. A constant flow of oil carries the contaminants and heat that are generated in operation away from the bearings to maximising uptime. The lubrication oil system instrumentation monitors and protects the system. In contrast, conventional grease lubricated units are messy, require frequent relubrication and must be water cooled.
We designed the hydraulic pumping system to the cylinders with advanced skew control (ASC) and use linear variable differential transducers (LVDTs) to monitor the system. As skewing starts to occur in the floating roll, the ASC system adjusts the press force applied to the hydraulic cylinders, keeping the roll assemblies as near parallel as possible during operation, while at the same time maintaining interparticle contact and grinding efficiency over the roll width.
There are two frame styles offered for industrial applications. The S-Series, which incorporates a traditional box frame design, has been optimised for smaller plants. The F-Series, using our express frame, accommodates the need to handle and operate larger and heavier components.
We designed and built our express frame for a faster and safer replacement of the roll surfaces. With the minerals processing industry trending towards larger equipment, we specifically developed the express frame to handle larger, heavier components in a safer and easier manner.
This new frame uses a tapered pin and bushing concept. Removal of the tapered bushing creates more clearance space for inserting and removing pins. A wedge jacking system takes the load off the pins for quick extraction and replacement.
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.
Henan LIMING Heavy Industry Science and Technology Co. LTD which mainly manufacture large and medium-sized crushing and grinding equipments was founded in 1987. It is a modern joint-stock corporation with research, manufacturing and sales together. The Headquarter is located in HI-TECH Industry Development Zone of Zhengzhou and covers 80000 m . Another workshop in Shangjie Industry Park covers 67000 m . Over the past 30 years, our company adheres to modern scientific management system, precision manufacturing, pioneering and innovation. Now LIMING has become the leader in domestic and oversea machinery manufacturing industry.
December, 2016: LIMING launched MB5X158Pendulum Suspension Grinding Mill. Besides, the company was rated as 2016 annual innovative enterprise of the sand and gravel industry and 2016 annual excellent entrepreneur of the sand and gravel industry.
October, 2016: LIMING passed the certification of intellectual property management system. There are 106 national patents including 4 invention patents, 12 design patents and 90 patents for utility models.
March,2015: The model line of VU aggregate optimization system was completed at Zhengzhou headquarters base, 26 meters high, including six core modules, showing the superiority of dry sand making technology
April, 2015: MTW European Trapezium Mill was jointly awarded Industrial Energy Saving Products by The Ministry of Industry And Information Office of Henan Province, and Science And Technology Department Of Henan Province; Liming Heavy Industry was assessed as Intellectual Property Advantage Cultivate Enterprise of 2014.
January, 2015: Liming Heavy Industry was selected to The Fifth Member Of The National Mining Machinery Standards Committee; VSI5X Vertical Shaft Impact Crusher was identified as Brand-Name Products in Henan Province.
November, 2014: Customer Center was fully upgraded to Customer Security Center, and sublimated the service concept. HPT Series High-Efficiency Hydraulic Cone Crusher and LUM Series superfine vertical roller grinding mill both got the provincial Science and Technology Achievement, which reached worlds advanced level.
July, 2014: Liming Heavy Industry had the honor to be on the list of "Henan province Quality credit AAA grade enterprise brand", and became a member unit of "China quality integrity enterprise association".
June, 2014: Tired Mobile Crushing Plant Wheeled Mobile Crusher won the second prize for Scientific and Technological Achievements of Henan province. And the world largest Crawler Mobile Vibrating Screen was successfully delivered in Shangjie Industrial Park.
May, 2014: 2014 First international trade e-commerce services base of Google in China, as well as first Google Adwords experience center, both settled in Liming Heavy Industry. With their powerful combination, e-commerce of Henan was well boomed. MTW European Type Trapezium Mill won the first prize for Science and Technology progress award in Zhengzhou. Liming Heavy Industry had the honor to be on the list of top 100 enterprises for the employment of college students, which is the only involved enterprise in mining and crushing field.
March, 2014: Liming Heavy Industry got financial support from " high growth " program of government, and was recognized as " Outstanding Innovation Enterprise". Sales volume of the first quarter got a 30% year-on-year contrarian growth, and sales volume of March renovated the historic records of monthly sales volume.
May, 2013: Liming Heavy Industry had the honor to be on the list of top 100 enterprises in Zhengzhou. And Liming Heavy Industry would like to make greater contribution to the economic development of Central China.
March, 2013: Liming Heavy Industry was awarded the Title of" National high-tech enterprises" which highlights the important value of technology in mining machinery industry. At the same time, Liming Heavy Industry was awarded the Fast growing Company and became the demonstration enterprise in regional economy and the development of the industry.
October 2012: Hydraulic Cone Crusher and VSI Vertical Shaft Impact Crusher were rated as the leading domestic level, European Jaw Crusher was rated as the domestic advanced level by Science and Technology Department of Henan Province.
June, 2012 HPC efficient hydraulic cone crusher and VSI sand making machine are rated as the leading domestic level by the Science and Technology Department of Henan; European type jaw crusher has been assessed as a national advanced level.
March, 2012 Crushing and milling series of more than 100 models passed the Russian GOST quality certification, becoming the second international quality certification following the European CE certification.
JApril, 2011 A base for the new headquarters completed in a smooth relocation of various functional departments. Of building a base for the new headquarters will be completed by the end of the year, when the company will become the domestic mining machinery industry, the most superior hardware capabilities, production and processing of the strongest, most advanced scientific research strength enterprise.
December, 2010 The group company crossed the line of 1,000,000,000 RMB in annual sales./p> March, 2010 Henan Liming Heavy Industry Science & Technology Co.,Ltd. is evaluated as "The Famous Brand" in Henan Province. February, 2010The Employee Award Congress for 2009 close with great success. Annual Work Conference for 2010 is held successfully.
June, 2009YSY Mobile Cone Crusher Crushing Plant for medium reduction is delivered to Azerbaijan. It marks the production of mobile crushing plants in complete seriality and maturity after YGE and YSF series. Meanwhile, the newly introduced VSI5X sand making machine is set up in Russia. The upgrading of new products kicks off.
June, 2009YSY Mobile Cone Crusher Crushing Plant for medium reduction is delivered to Azerbaijan. It marks the production of mobile crushing plants in complete seriality and maturity after YGE and YSF series. Meanwhile, the newly introduced VSI5X sand making machine is set up in Russia. The upgrading of new products kicks off.
December, 2008the sales of the company is nearly 600,000,000RMB. Meanwhile, MTW Series European Technology Trapezium Mill and large LM Series Vertical Mill are launched. Additionally, the researching and development of large Jaw Crusher achieve many breakthroughs. The models of jaw crusher become more complete because of the introduction of PE10001200.
March, 2006Our company is awarded as "The Advanced Company in Sand-Stone Association". The jaw crusher, impact crusher and vertical shaft impact crusher is listed as the recommended products in the association.
November, 2001 The first machine exported is delivered to Kazakhstan and put into use. In the same year, our products are exported to Malaysia, Australia, South Korea, Indonesia, Russia and other countries and get good reputation there.
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High PressureGrinding Mill Introduction: High PressureGrinding Mill is a new kind of mill with high pressure.It is invented with great concentration and on the basis of many years of powder processing experiences. This invention starts an epoch of high efficiency and low cost in international mining industry. High PressureGrinding Mill can be used to grind non-inflammable and non-explosive materials with Mohs hardness below 9.3 and moisture content below 6%, such as gypsum, barite, limestone, etc. Size of final products can be adjusted between 40-425 mesh (The fineness powdercanbe 1000 mesh). High PressureGrinding Mill Principle: In the mainframe of the mill, there are strong springs with pressure as high as 1000-1500 kg equipped on the roller suspender. When High PressureGrinding Mill (Raymond Mill) works, the roller rotates around the principal axis, and clings to ring under the effect of the strong spring and eccentricity. Its press is 1.2 times of Raymond mill under the same press condition, so the production is largely increased. When the materials are sent into the grinding chamber, they are brought to the space between the roller and ring and get grinded. Then the powder grinded will be blown into separator. The fine powder after departed with the air is discharged through the outlet as final product. The large-sized powder falls back for regrinding. The air will be back to the blower for repetition of the above process. The left air wil come to thel bag filter to get cleaned. When the wear and tear between roller and the ring reaches certain degree, adjust the length of the strong spring,, so to keep the invariable pressure between the roller and the ring, to make sure the stable production and the fineness. High Pressure Grinding Mill Performance Feature: 01- Compared withthe traditionalmills, its capacity increases by 10%-20% under the same power condition, and compression force of rollers to material improve 800-1200kgf under the force of high-pressure spring. 02- Output Size of final product can be 0.613mm (30mesh) 0.033mm (425mesh). Some can reach the fineness of 0.013mm (1000 mesh). 03-Meets the requirement of national dust-dump standard. 04- The separator can be adjusted very easily. High PressureGrinding Mill Specification: Model Roller Number Roller Size (mm) Max. Feed Size (mm) Maximum Output Size (mm) Capacity (t/h) Motor Power (kw) Blower Power (kw) Dimension (L*W*H) (mm) QBM6515 3 210150 12-20 0.613-0.033 0.25-2 15 11 4100*3300*4500 QBM7815 3 260150 15-20 0.025-0.005 0.28-3 18.5 15 4300*3500*5100 QBM3016 3 300150 15-20 0.025-0.005 0.35-4 22 18.5 5300*4100*5200 QBM9517 4 310150 15-25 0.025-0.005 1.5-9 37 30 7100*5900*7900 QBM4121 5 410190 15-25 0.613-0.044 4-8 75 55 7850*8000*9700 QBM4528 6 450280 15-35 0.613-0.044 5-22 132 132 12550*5700*8300 Notice: Any change ofHigh Pressure GrindingMilltechnical data shall not be advised additionally. If you are interested in ourHigh Pressure GrindingMill, please refer to: Email:[email protected] Mobile:+86 Skype:cliff-qin Video:https://www.youtube.com/watch?v=OEY6sF_TbpM https://www.youtube.com/watch?v=mKndTS0SpOI
High PressureGrinding Mill Introduction: High PressureGrinding Mill is a new kind of mill with high pressure.It is invented with great concentration and on the basis of many years of powder processing experiences. This invention starts an epoch of high efficiency and low cost in international mining industry. High PressureGrinding Mill can be used to grind non-inflammable and non-explosive materials with Mohs hardness below 9.3 and moisture content below 6%, such as gypsum, barite, limestone, etc. Size of final products can be adjusted between 40-425 mesh (The fineness powdercanbe 1000 mesh). High PressureGrinding Mill Principle: In the mainframe of the mill, there are strong springs with pressure as high as 1000-1500 kg equipped on the roller suspender. When High PressureGrinding Mill (Raymond Mill) works, the roller rotates around the principal axis, and clings to ring under the effect of the strong spring and eccentricity. Its press is 1.2 times of Raymond mill under the same press condition, so the production is largely increased. When the materials are sent into the grinding chamber, they are brought to the space between the roller and ring and get grinded. Then the powder grinded will be blown into separator. The fine powder after departed with the air is discharged through the outlet as final product. The large-sized powder falls back for regrinding. The air will be back to the blower for repetition of the above process. The left air wil come to thel bag filter to get cleaned. When the wear and tear between roller and the ring reaches certain degree, adjust the length of the strong spring,, so to keep the invariable pressure between the roller and the ring, to make sure the stable production and the fineness.
High Pressure Grinding Mill Performance Feature: 01- Compared withthe traditionalmills, its capacity increases by 10%-20% under the same power condition, and compression force of rollers to material improve 800-1200kgf under the force of high-pressure spring. 02- Output Size of final product can be 0.613mm (30mesh) 0.033mm (425mesh). Some can reach the fineness of 0.013mm (1000 mesh). 03-Meets the requirement of national dust-dump standard. 04- The separator can be adjusted very easily.
Model Roller Number Roller Size (mm) Max. Feed Size (mm) Maximum Output Size (mm) Capacity (t/h) Motor Power (kw) Blower Power (kw) Dimension (L*W*H) (mm) QBM6515 3 210150 12-20 0.613-0.033 0.25-2 15 11 4100*3300*4500 QBM7815 3 260150 15-20 0.025-0.005 0.28-3 18.5 15 4300*3500*5100 QBM3016 3 300150 15-20 0.025-0.005 0.35-4 22 18.5 5300*4100*5200 QBM9517 4 310150 15-25 0.025-0.005 1.5-9 37 30 7100*5900*7900 QBM4121 5 410190 15-25 0.613-0.044 4-8 75 55 7850*8000*9700 QBM4528 6 450280 15-35 0.613-0.044 5-22 132 132 12550*5700*8300
High-pressure grinding mill is mainly composed of main engine, blower, ultra-fineness analysis machine, finished cyclone powder collector, bag filter and connecting duct pipe, etc. According to the needs of users, it can be equipped with auxiliary equipment such as bucket elevator, storage bin, electric control cabinet, electromagnetic vibrating feeder, and jaw crusher.
High-pressure grinding mill is suitable for various fields, such as calcium carbonate pulverization processing, gypsum powder processing, power plant desulfurization, non-metallic mineral powder production, coal powder preparation, etc. Common materials include limestone, calcite, calcium carbonate, dolomite, barite, talc, gypsum, diabase, quartz, bentonite, etc. The particle size of the micro-grinding product can be arbitrarily adjusted within the range of 80-325 mesh, and some materials can be as high as 600 mesh.
In the grinding chamber, the grinding roller assembly is suspended on the grinding roller hanger through the cross-arm shaft and the grinding roller hanger is fixedly coupled with the main shaft and the blade holder. The pressure spring is tightly pressed by the tension rod in the grinding roller bearing chamber. On the outer end of the cantilever, with the cross-arm shaft as the support point, the spring roller presses the grinding roller tightly on the inner surface of the grinding ring. When the motor rotates through the transmission device, the blade mounted on the blade holder rotates synchronously with the grinding roller, and the grinding roller rotates around itself while rolling on the inner surface of the grinding ring. The analyzer drives the analyzer impeller to rotate through the motor drive, and the speed adjustment of the analyzer determines the fineness.
1. In the case of the same yield and fineness, the price of micro powder grinding mill is only one-eighth of the airflow mill, the scope of application is also larger, and the system energy consumption is only one-third of the airflow mill.
If your machine fails, production at the entire plant will be at risk. To avoid such losses, you can get critical replacement parts of the machine whenever you need it.
HPGR technology is a qualified alternative for large-scale comminution circuits and is becoming increasingly popular. The technology's working principle is that two counter-rotating grinding rolls expose a column of material to high pressure, which is distributed across the gap between the rolls. Interparticle comminution is the HPGR specific grinding process in which material particles are crushed and ground within the compressed material bed and not by contact with the roll surface. Feed material can be smaller than the gap, which is an important distinction as compared to crushers, for example. The high pressure comminution process causes micro-cracks in the particles, which lead to the liberation of minerals and a higher portion of fines. HPGR treated minerals show better leaching performance, because the micro-cracks increase the particle contact surface for the leaching liquid. Also, flotation efficiency is further enhanced through the use of HPGR comminution.
Grinding of material in HPGRs has proven to be more cost efficient as compared to conventional mills and crushers. Especially downstream processing stages such as ball-milling are more energy-efficient with an HPGR due to the finer product size distribution coming out and the additional effect of micro cracks within the product particles. In essence, the main motivation to use HPGR's is to save energy and production costs.
HPGRs can be employed in brownfield projects to de-bottleneck conventional crushing/milling circuits so as to increase total plant capacity. They can also be used as tertiary and/or quaternary crushing stages or in the pebble-crushing stage to improve downstream milling performance.
HPGR roll diameters typically range from 0.5 m to 2.8 m, depending on the supplies, and roll widths vary from 0.2 m to 1.8 m. The aspect ratio of the rolls also varies as a function of manufacturer. Typical HPGR throughput rates range from 20 to 3,000 tph, with installed motor power as high as 3,000 kW per roll. The roll surface is protected with wear-resistant materials, and it has been these that have traditionally stymied HPGR acceptance, but solutions are now in place.
Detailed descriptions of the derivation and formulation of the parameters are given in numerous texts, and as such, the following section provides only a precis of the critical formulas, with some examples of actual relationships from testwork.
When a plant design (with or withoutHigh Pressure Grinding Rolls) is being assembled, every well-equipped engineer will be able to turn to numerous rules of thumb associated with these crushers-even without reference to textbooks or suppliers.
The high pressure grinding roll has established itself in various industries. High pressure grinding rolls has been leading the way for the use of HPGR in the non-ferrous metals mining industry. In comminution circuits of the cement and diamond industry, HPGR has become a standard grinding tool. HPGR has demonstrated economic and technical benefits that are nothing short of spectacular.
HPGR offers operational features such as low wear, high availability, push button control for fineness of grind and throughput, compact size, proven technology and performance guarantees will become pivotal for plant optimization and expansion. The key features of HPGR, the cost-efficient operation due to reduction of power and the even more significant decreases of steel wear cost, have been unchallenged by any other available comminution technology.
Unfortunately, high pressure grinding rolls continue to be confused with conventional roll crushers. HPGR comminution is substantially different from impact, attrition and abrasion comminution as it occurs in crushers, SAG and ball mills. The HPGR comminution occurs in a bed of particles between two counter-rotating rolls where only a limited amount of the ore is in contact with the rolls. The particles are breaking each other in a restricted space with no opportunity to move or escape. Therefore, the comminution efficiency is significantly higher than in conventional crushing and ball mill grinding. The HPGR comminution exhibits two extremely important features in regard to hydrometallurgical dump, heap, thin layer, vat or agitation leach operations:
High-pressure grinding rolls were first applied in the minerals industry in 1985 in cement plants. The main objective for the use of HPGR was the significant energy savings achievable. Today, they are also being used by diamond mines and for the communition of coal as well as for the grinding of slag, iron and chromium concentrates (Figure 4).
If ball milling was completely replaced by HPGR, up to 50% of the energy needed for the dry grinding mill could be saved. In wet grinding, the energy savings are lower, yet still noticeable. Further to the reduction in energy costs, the HPGR also proved to produce higher quality grinding products and/or a better recovery. At present, 165 HPGR Polycom units have been sold worldwide; about 11% of them are operating in the mining industry.
Gold mining operations have, thus far, not utilized the considerable metallurgical and economic benefits offered by HPGR grinding. As is the case with any new processing equipment, a certain acceptance time is required before operators recognize the potential and are willing to modify conventional circuits. Also, while the priority in many grinding operations has been on energy and throughput, gold processing plants, especially, have not recognized the dramatic beneficial effects high-pressure roll grinding has on the gold metallurgy.
Through these recent optimizations and the simplicity of the unit, todays HPGR designs provide high reliability and cost-efficient operations. Coupled with the Polycom HPGR small space requirements, they are ideally suited for comminution plant modifications and upgrades. HPGR Polycom grinding is now being considered for several gold operations in the western United States as well as for refractory gold plants in Australia (Grier, 1992). Judging from other technology improvements and operating practices in gold processing which have come from the cement industry (Marsden et al. 1993), it is almost certain that the remarkable impact high-pressure grinding rolls have made in cement plants will also find its way into gold operations.
Even though there are definitely local preferences to the use of comminution technology, the selection of a cost-efficient, high-recovery crushing and grinding circuit depends predominantly on the compositional characteristics of the gold ore. Therefore, many of the subsequent gold recovery problems are directly related to results of the comminution.
Although considerable progress has been made with optimized conventional and/or innovative gold ore treatment, significant processing problems remain with many ores. They are primarily related to the mineralogy of the ore feed. Further, the mode of occurrence of the gold is essential for the precious metals recovery after comminution (Baum, 1990).
These findings are supported by Mintek (1993) in an evaluation of gold ores from the Pacific Rim which points out that because of the variability and mineralogical complexity of many ores from the southwest Pacific, very careful control of the comminution process is required for optimum results.Get in Touch with Mechanic