Zimbabwe has abundant natural resources, coal, chromium, gold, silver, iron, asbestos, lithium, and niobium, lead, zinc, tin, uranium, copper, nickel, etc. Coal, iron, chromium, and asbestos deposits are famous in the world for the large quantity. Zimbabwe has been a crazy plundering Africa wealth of western colonists, and it was referred as "the jewel in the crown" before it was independent. Coal reserves are about 27 billion tons. Iron reserves are about 250 million tons. Chromium and asbestos reserves are large. This country is lack of water resources. Main industrial categories are metal and metal processing, food processing, oil, chemical industry, drinks and tobacco, textile, paper making and printing, etc.
In 2008, the domestic political and economic situation continues to deteriorate and the international financial crisis, most mining companies are closed. Since the coalition government was establishment in February 2009, mining industry began to recover. Mining industry grew 26% year-on-year in 2011. According to the report, Zimbabwe platinum producer has regarded Engels's area underground mine as the company $258 million plan's first phase of expansion plans for the long term. Once realizing full production, the new platinum mining is expected to push up Zimbabwe mining company's ore annual output to 4.5 million tons, and the platinum output will be 5 tons.
For mining platinum ore in Zimbabwe, SBM supplies and evaluate equipment to make unbiased selections of the best equipment for this mining processing. SBM can provide the full range of capabilities to convert run of mine platinum to saleable products, integrating engineering and process know-how in development and optimization of plant designs for platinum that meets global environmental standards.
Platinum mining plant usually includes three main processing stages: crushing, grinding and beneficiation stages. The first two stages are used to get large scale raw platinum materials into fine size. Beneficiation plant will help to get fine powder materials into high grade and pure materials.
The main machine used in platinum mining plant has jaw crusher, cone crusher, impact crusher, mobile crusher and ball mill, vertical roller mill, ultrafine mill and mobile grinding plant. Of course, in the whole production line, it needs the auxiliary equipment to finish the whole processing, such as the vibrating feeder, vibrating screen, belt conveyor and so on. In beneficiation plant, all kinds of beneficiation machines will be used, like, separators, washing machine etc. These beneficiation machines will cooperate with main processing equipment to make the whole line for Zimbabwe platinum production line.
SBM is a professional mining machine manufacturer from China and our company has established good cooperation relationship with Africa countries, such as Zimbabwe, South Africa, and Uganda and so on. Our mining machines have helped local mining operators get much profit. Based on over 20 years' production experience, SBM has produced high quality and advanced mining machines for sale, crushing machine, grinding machine and beneficiation equipment.
Platinum mining jaw crusher is the major crushing equipment used as primary crushing machine in mining and quarrying industry. SBM jaw crusher machine belongs to the practical and economic equipment machine for mining operators. This primary crusher machine is designed to break all kinds of mineral ores with high crushing capability, low costs, high reduction ratio which makes it popular in over 100 countries.
SBM's cone crusher machine has the spring release system will allow the tramp platinum to pass without damage to the crushing chamber. The sealing system adopts the double dry oil and water sealing to separate the lubricating oil from stone dust to provide its reliable operating. Our platinum cone crusher has reliable construction, high productivity, easy adjustment and low operating costs.
Milling machine used in platinum processing line from SBM refers to the vertical roller mill. This grinding mill has easy access for replacement of runners, casing and segments of the rotating table without dismantling of the grinding chamber and separator. This grinding milling machine is used to get fine powder platinum materials in Zimbabwe.
Its fully-enclosed layout features high integration. It integrates the functions of high-efficiency sand making, particle shape optimization, filler content control, gradation control, water content control, and environmental protection into a single syst
According to the national annual report on prevention and control of solid waste pollution in large and medium-sized cities issued by the Ministry of ecological environment of China, the annual output of bulk industrial solid waste in China is 3.067 billion tons, of which the tailings of lead-zinc mine also accounts for a high proportion of industrial tailings.
What kind of machine is used to grind lead-zinc tailings? There are many kinds of lead-zinc tailings recycling equipment in the market. HC series Raymond mill and HLM series vertical mill are popular all the time. They can be divided into several models according to different needs of users. Customers can choose according to their own needs.
[Application field]The mill covers a number of patented technologies. It is widely used in electric power, metallurgy, cement, chemical industry, building materials, coatings, papermaking, rubber, medicine, food and other fields of production and life.
[Performance advantages]The mill is a new generation of traditional mill equipment. It is widely used, easy to operate, easy to maintain, stable performance, cost-effective, the output is 30% - 40% higher than the traditional Raymond mill, is an economic and practical grinding equipment.
[Application material]It has high yield and high efficiency grinding ability for all kinds of non-metallic mineral materials with Mohs hardness less than 7 and humidity less than 6%. For example, talc, calcite, calcium carbonate, dolomite, potassium feldspar, bentonite, kaolin, graphite, carbon, fluorite, brucite and other grinding effect is good.
[Scope of application]It is widely used in electric power, metallurgy, cement, chemical industry, building materials, coatings, papermaking, rubber, medicine, food and other fields of production and life.
[Applicable materials]For all kinds of non-metallic mineral materials with Mohs hardness less than 7 and humidity less than 6%, it has high-yield and efficient grinding ability, such as cement raw meal, clinker, power plant desulfurization limestone powder, slag powder, manganese ore, gypsum, coal, barite, calcite, bauxite, etc.
[Performance advantages]It has the advantages of high grinding efficiency, low power consumption, large feed particle size, easy adjustment of product fineness, simple equipment process, small floor area, low noise, small dust, low operation cost and low consumption of wear-resistant materials.
The lead-zinc mine tailings recycling is mainly grinding the lead-zinc mine tailings into powder. Tailings re concentration, building materials production and mine filling are the most common lead-zinc mine tailings recycling processes.
There are sulfur, iron, barite, sericite, fluorite and other minerals in lead-zinc tailings. It uses flotation, magnetic separation and other processes to enrich sulfur. When the sulfur content reaches a certain level, it can be sent to produce sulfuric acid to realize the reuse of lead-zinc tailings. Lead, zinc, copper and other elements in the tailings of lead-zinc mine can mineralize or promote the melting of cement clinker. It can be used to produce building wallboard materials and produce economic value. At the same time, it can also achieve zero discharge of tailings. It is also a good choice for the reuse of lead-zinc mine tailings.
Due tothe slight difference in the use of grinding equipment for different lead-zinc tailings, the different models and different prices are required, so the specific machine for the reuse of lead-zinc tailings is more than one, and the actual production is also required. HCMilling(Guilin Hongcheng)has many offices all over the world. If you have any demand, you can consult online directly. Our sales manager will provide you with a price list and choose the right model for you according to your investment budget.
If you are interested in calcium silicon slag grinding mill for papermaking,pls contact [email protected] call at , HCM will tailor for you the most suitable grinding mill program based on your needs, more details please check www.hcmilling.com.
Simply complete the form below, click submit, you will get the price list and a Hongcheng representative will contact you within one business day. Please also feel free to contact us by email or phone. ( * Denotes a required field).
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In the western region of Nigeria, there is distributed with lots of alluvial gold mine and native gold. The following states have abundant gold ore resources: Osun, Edo, Niger, Kebbi, Kaduna and Sokoto. In this country's northwest and southwest areas, it have found large scale commercial extraction native gold ore site. According to information, these native gold ores are buried shallow and the level is relatively high. The production costs of the gold ore are per ounce 50 dollars.
Nigeria is rich with gold ore and how to make best use of these native gold ore resources becomes very important for the local economic increasing. For all of us, we know that, native gold ore does not satisfy the detailed production requirements and it needs to be processed into the high grade gold ore.
Native gold ore materials will be extracted, crushed, grinded, washed and benefited. Then these processed materials will be sold or used in the market. Nigeria whole gold ore processing line includes the gold ore mining stage and gold ore washing plant.
SBM's range of services for gold ore processing covers all processes needed for the recovery of gold, from ore to bullion and fine gold, converting run-of-mine (ROM) ore into saleable products, integrating engineering and process know-how in development and optimization of plant designs, and delivering processing facilities to global environmental standards.
Native gold ore mining processing plant in Nigeria refers to the gold ore extraction stage, gold ore crushing and grinding stages. In gold ore extraction stage, the native gold ore will be got from the mineral monitions. These gold ore will be taken to the mining processing plant. In the mining processing plant, gold ore crushing and grinding stages will play great role.
Gold ore crushing mining processing plant will break the large scale gold ore materials into small size with crushing machine. SBM is a professional crushing machine manufacturer and it has produced lots of high efficient crushing machine for the mineral ore mining production line and construction industry. SBM has the PE series jaw crusher, PEW series jaw crusher, PF series impact crusher, PFW series impact crusher, cone crusher, hammer crusher, VSI crusher and so on. These different kinds of crushers can be used in the mineral ore production line.
When the gold ore is crushed into small size, some customers will need the grinding machine to process the gold ore materials into further smaller size to powder. Grinding machine from SBM will help to grind the crushed gold ore materials into powder. These high quality and low costs gold ore grinding machine is vital for gold ore mining processing plant.
If the gold ore is processed in mining production line, next will be the gold ore washing stage. Gold ore washing machine generally can make the unpurified gold ore into high grade gold ore materials without mud or other materials.
SBM gold ore washing processing machine has new seal structure and reliable driving equipment which can make sure the cleaning effect and a kind of high efficient. This gold ore washing machine is welcomed by Nigeria for the following great features:
According to the above text, SBM designs the specific gold ore processing production line for Nigeria local customers. The local gold ore hardness is 2.5-3.0. The detailed gold ore processing production line involves the gold ore PE series jaw crusher + gold ore cone crusher + gold ore PF series impact crusher + gold ore XSD sand washer + the auxiliary equipment. Besides the main crushing and grinding processing machine, it also needs the auxiliary equipment, such as the vibrating feeder, vibrating screen, belt conveyor. The whole gold production line will help local clients get high grade gold ore with low operation costs.
In all ore dressing and milling Operations, including flotation, cyanidation, gravity concentration, and amalgamation, the Working Principle is to crush and grind, often with rob mill & ball mills, the ore in order to liberate the minerals. In the chemical and process industries, grinding is an important step in preparing raw materials for subsequent treatment.In present day practice, ore is reduced to a size many times finer than can be obtained with crushers. Over a period of many years various fine grinding machines have been developed and used, but the ball mill has become standard due to its simplicity and low operating cost.
A ball millefficiently operated performs a wide variety of services. In small milling plants, where simplicity is most essential, it is not economical to use more than single stage crushing, because the Steel-Head Ball or Rod Mill will take up to 2 feed and grind it to the desired fineness. In larger plants where several stages of coarse and fine crushing are used, it is customary to crush from 1/2 to as fine as 8 mesh.
Many grinding circuits necessitate regrinding of concentrates or middling products to extremely fine sizes to liberate the closely associated minerals from each other. In these cases, the feed to the ball mill may be from 10 to 100 mesh or even finer.
Where the finished product does not have to be uniform, a ball mill may be operated in open circuit, but where the finished product must be uniform it is essential that the grinding mill be used in closed circuit with a screen, if a coarse product is desired, and with a classifier if a fine product is required. In most cases it is desirable to operate the grinding mill in closed circuit with a screen or classifier as higher efficiency and capacity are obtained. Often a mill using steel rods as the grinding medium is recommended, where the product must have the minimum amount of fines (rods give a more nearly uniform product).
Often a problem requires some study to determine the economic fineness to which a product can or should be ground. In this case the 911Equipment Company offers its complete testing service so that accurate grinding mill size may be determined.
Until recently many operators have believed that one particular type of grinding mill had greater efficiency and resulting capacity than some other type. However, it is now commonly agreed and accepted that the work done by any ballmill depends directly upon the power input; the maximum power input into any ball or rod mill depends upon weight of grinding charge, mill speed, and liner design.
The apparent difference in capacities between grinding mills (listed as being the same size) is due to the fact that there is no uniform method of designating the size of a mill, for example: a 5 x 5 Ball Mill has a working diameter of 5 inside the liners and has 20 per cent more capacity than all other ball mills designated as 5 x 5 where the shell is 5 inside diameter and the working diameter is only 48 with the liners in place.
Ball-Rod Mills, based on 4 liners and capacity varying as 2.6 power of mill diameter, on the 5 size give 20 per cent increased capacity; on the 4 size, 25 per cent; and on the 3 size, 28 per cent. This fact should be carefully kept in mind when determining the capacity of a Steel- Head Ball-Rod Mill, as this unit can carry a greater ball or rod charge and has potentially higher capacity in a given size when the full ball or rod charge is carried.
A mill shorter in length may be used if the grinding problem indicates a definite power input. This allows the alternative of greater capacity at a later date or a considerable saving in first cost with a shorter mill, if reserve capacity is not desired. The capacities of Ball-Rod Mills are considerably higher than many other types because the diameters are measured inside the liners.
The correct grinding mill depends so much upon the particular ore being treated and the product desired, that a mill must have maximum flexibility in length, type of grinding medium, type of discharge, and speed.With the Ball-Rod Mill it is possible to build this unit in exact accordance with your requirements, as illustrated.
To best serve your needs, the Trunnion can be furnished with small (standard), medium, or large diameter opening for each type of discharge. The sketch shows diagrammatic arrangements of the four different types of discharge for each size of trunnion opening, and peripheral discharge is described later.
Ball-Rod Mills of the grate discharge type are made by adding the improved type of grates to a standard Ball-Rod Mill. These grates are bolted to the discharge head in much the same manner as the standard headliners.
The grates are of alloy steel and are cast integral with the lifter bars which are essential to the efficient operation of this type of ball or rod mill. These lifter bars have a similar action to a pump:i. e., in lifting the product so as to discharge quickly through the mill trunnion.
These Discharge Grates also incorporate as an integral part, a liner between the lifters and steel head of the ball mill to prevent wear of the mill head. By combining these parts into a single casting, repairs and maintenance are greatly simplified. The center of the grate discharge end of this mill is open to permit adding of balls or for adding water to the mill through the discharge end.
Instead of being constructed of bars cast into a frame, Grates are cast entire and have cored holes which widen toward the outside of the mill similar to the taper in grizzly bars. The grate type discharge is illustrated.
The peripheral discharge type of Ball-Rod Mill is a modification of the grate type, and is recommended where a free gravity discharge is desired. It is particularly applicable when production of too many fine particles is detrimental and a quick pass through the mill is desired, and for dry grinding.
The drawings show the arrangement of the peripheral discharge. The discharge consists of openings in the shell into which bushings with holes of the desired size are inserted. On the outside of the mill, flanges are used to attach a stationary discharge hopper to prevent pulp splash or too much dust.
The mill may be operated either as a peripheral discharge or a combination or peripheral and trunnion discharge unit, depending on the desired operating conditions. If at any time the peripheral discharge is undesirable, plugs inserted into the bushings will convert the mill to a trunnion discharge type mill.
Unless otherwise specified, a hard iron liner is furnished. This liner is made of the best grade white iron and is most serviceable for the smaller size mills where large balls are not used. Hard iron liners have a much lower first cost.
Electric steel, although more expensive than hard iron, has advantage of minimum breakage and allows final wear to thinner section. Steel liners are recommended when the mills are for export or where the source of liner replacement is at a considerable distance.
Molychrome steel has longer wearing qualities and greater strength than hard iron. Breakage is not so apt to occur during shipment, and any size ball can be charged into a mill equipped with molychrome liners.
Manganese liners for Ball-Rod Mills are the world famous AMSCO Brand, and are the best obtainable. The first cost is the highest, but in most cases the cost per ton of ore ground is the lowest. These liners contain 12 to 14% manganese.
The feed and discharge trunnions are provided with cast iron or white iron throat liners. As these parts are not subjected to impact and must only withstand abrasion, alloys are not commonly used but can be supplied.
Gears for Ball-Rod Mills drives are furnished as standard on the discharge end of the mill where they are out of the way of the classifier return, scoop feeder, or original feed. Due to convertible type construction the mills can be furnished with gears on the feed end. Gear drives are available in two alternative combinations, which are:
All pinions are properly bored, key-seated, and pressed onto the steel countershaft, which is oversize and properly keyseated for the pinion and drive pulleys or sheaves. The countershaft operates on high grade, heavy duty, nickel babbitt bearings.
Any type of drive can be furnished for Ball-Rod Mills in accordance with your requirements. Belt drives are available with pulleys either plain or equipped with friction clutch. Various V- Rope combinations can also be supplied.
The most economical drive to use up to 50 H. P., is a high starting torque motor connected to the pinion shaft by means of a flat or V-Rope drive. For larger size motors the wound rotor (slip ring) is recommended due to its low current requirement in starting up the ball mill.
Should you be operating your own power plant or have D. C. current, please specify so that there will be no confusion as to motor characteristics. If switches are to be supplied, exact voltage to be used should be given.
Even though many ores require fine grinding for maximum recovery, most ores liberate a large percentage of the minerals during the first pass through the grinding unit. Thus, if the free minerals can be immediately removed from the ball mill classifier circuit, there is little chance for overgrinding.
This is actually what has happened wherever Mineral Jigs or Unit Flotation Cells have been installed in the ball mill classifier circuit. With the installation of one or both of these machines between the ball mill and classifier, as high as 70 per cent of the free gold and sulphide minerals can be immediately removed, thus reducing grinding costs and improving over-all recovery. The advantage of this method lies in the fact that heavy and usually valuable minerals, which otherwise would be ground finer because of their faster settling in the classifier and consequent return to the grinding mill, are removed from the circuit as soon as freed. This applies particularly to gold and lead ores.
Ball-Rod Mills have heavy rolled steel plate shells which are arc welded inside and outside to the steel heads or to rolled steel flanges, depending upon the type of mill. The double welding not only gives increased structural strength, but eliminates any possibility of leakage.
Where a single or double flanged shell is used, the faces are accurately machined and drilled to template to insure perfect fit and alignment with the holes in the head. These flanges are machined with male and female joints which take the shearing stresses off the bolts.
The Ball-Rod Mill Heads are oversize in section, heavily ribbed and are cast from electric furnace steel which has a strength of approximately four times that of cast iron. The head and trunnion bearings are designed to support a mill with length double its diameter. This extra strength, besides eliminating the possibility of head breakage or other structural failure (either while in transit or while in service), imparts to Ball-Rod Mills a flexibility heretofore lacking in grinding mills. Also, for instance, if you have a 5 x 5 mill, you can add another 5 shell length and thus get double the original capacity; or any length required up to a maximum of 12 total length.
On Type A mills the steel heads are double welded to the rolled steel shell. On type B and other flanged type mills the heads are machined with male and female joints to match the shell flanges, thus taking the shearing stresses from the heavy machine bolts which connect the shell flanges to the heads.
The manhole cover is protected from wear by heavy liners. An extended lip is provided for loosening the door with a crow-bar, and lifting handles are also provided. The manhole door is furnished with suitable gaskets to prevent leakage.
The mill trunnions are carried on heavy babbitt bearings which provide ample surface to insure low bearing pressure. If at any time the normal length is doubled to obtain increased capacity, these large trunnion bearings will easily support the additional load. Trunnion bearings are of the rigid type, as the perfect alignment of the trunnion surface on Ball-Rod Mills eliminates any need for the more expensive self-aligning type of bearing.
The cap on the upper half of the trunnion bearing is provided with a shroud which extends over the drip flange of the trunnion and effectively prevents the entrance of dirt or grit. The bearing has a large space for wool waste and lubricant and this is easily accessible through a large opening which is covered to prevent dirt from getting into the bearing.Ball and socket bearings can be furnished.
Scoop Feeders for Ball-Rod Mills are made in various radius sizes. Standard scoops are made of cast iron and for the 3 size a 13 or 19 feeder is supplied, for the 4 size a 30 or 36, for the 5 a 36 or 42, and for the 6 a 42 or 48 feeder. Welded steel scoop feeders can, however, be supplied in any radius.
The correct size of feeder depends upon the size of the classifier, and the smallest feeder should be used which will permit gravity flow for closed circuit grinding between classifier and the ball or rod mill. All feeders are built with a removable wearing lip which can be easily replaced and are designed to give minimum scoop wear.
A combination drum and scoop feeder can be supplied if necessary. This feeder is made of heavy steel plate and strongly welded. These drum-scoop feeders are available in the same sizes as the cast iron feeders but can be built in any radius. Scoop liners can be furnished.
The trunnions on Ball-Rod Mills are flanged and carefully machined so that scoops are held in place by large machine bolts and not cap screws or stud bolts. The feed trunnion flange is machined with a shoulder for insuring a proper fit for the feed scoop, and the weight of the scoop is carried on this shoulder so that all strain is removed from the bolts which hold the scoop.
High carbon steel rods are recommended, hot rolled, hot sawed or sheared, to a length of 2 less than actual length of mill taken inside the liners. The initial rod charge is generally a mixture ranging from 1.5 to 3 in diameter. During operation, rod make-up is generally the maximum size. The weights per lineal foot of rods of various diameters are approximately: 1.5 to 6 lbs.; 2-10.7 lbs.; 2.5-16.7 lbs.; and 3-24 lbs.
Forged from the best high carbon manganese steel, they are of the finest quality which can be produced and give long, satisfactory service. Data on ball charges for Ball-Rod Mills are listed in Table 5. Further information regarding grinding balls is included in Table 6.
Rod Mills has a very define and narrow discharge product size range. Feeding a Rod Mill finer rocks will greatly impact its tonnage while not significantly affect its discharge product sizes. The 3.5 diameter rod of a mill, can only grind so fine.
Crushers are well understood by most. Rod and Ball Mills not so much however as their size reduction actions are hidden in the tube (mill). As for Rod Mills, the image above best expresses what is going on inside. As rocks is feed into the mill, they are crushed (pinched) by the weight of its 3.5 x 16 rods at one end while the smaller particles migrate towards the discharge end and get slightly abraded (as in a Ball Mill) on the way there.
We haveSmall Ball Mills for sale coming in at very good prices. These ball mills are relatively small, bearing mounted on a steel frame. All ball mills are sold with motor, gears, steel liners and optional grinding media charge/load.
Ball Mills or Rod Mills in a complete range of sizes up to 10 diameter x20 long, offer features of operation and convertibility to meet your exactneeds. They may be used for pulverizing and either wet or dry grindingsystems. Mills are available in both light-duty and heavy-duty constructionto meet your specific requirements.
All Mills feature electric cast steel heads and heavy rolled steelplate shells. Self-aligning main trunnion bearings on large mills are sealedand internally flood-lubricated. Replaceable mill trunnions. Pinion shaftbearings are self-aligning, roller bearing type, enclosed in dust-tightcarrier. Adjustable, single-unit soleplate under trunnion and drive pinionsfor perfect, permanent gear alignment.
Ball Mills can be supplied with either ceramic or rubber linings for wet or dry grinding, for continuous or batch type operation, in sizes from 15 x 21 to 8 x 12. High density ceramic linings of uniform hardness male possible thinner linings and greater and more effective grinding volume. Mills are shipped with liners installed.
Complete laboratory testing service, mill and air classifier engineering and proven equipment make possible a single source for your complete dry-grinding mill installation. Units available with air swept design and centrifugal classifiers or with elevators and mechanical type air classifiers. All sizes and capacities of units. Laboratory-size air classifier also available.
A special purpose batch mill designed especially for grinding and mixing involving acids and corrosive materials. No corners mean easy cleaning and choice of rubber or ceramic linings make it corrosion resistant. Shape of mill and ball segregation gives preferential grinding action for grinding and mixing of pigments and catalysts. Made in 2, 3 and 4 diameter grinding drums.
Nowadays grinding mills are almost extensively used for comminution of materials ranging from 5 mm to 40 mm (3/161 5/8) down to varying product sizes. They have vast applications within different branches of industry such as for example the ore dressing, cement, lime, porcelain and chemical industries and can be designed for continuous as well as batch grinding.
Ball mills can be used for coarse grinding as described for the rod mill. They will, however, in that application produce more fines and tramp oversize and will in any case necessitate installation of effective classification.If finer grinding is wanted two or three stage grinding is advisable as for instant primary rod mill with 75100 mm (34) rods, secondary ball mill with 2540 mm(11) balls and possibly tertiary ball mill with 20 mm () balls or cylpebs.To obtain a close size distribution in the fine range the specific surface of the grinding media should be as high as possible. Thus as small balls as possible should be used in each stage.
The principal field of rod mill usage is the preparation of products in the 5 mm0.4 mm (4 mesh to 35 mesh) range. It may sometimes be recommended also for finer grinding. Within these limits a rod mill is usually superior to and more efficient than a ball mill. The basic principle for rod grinding is reduction by line contact between rods extending the full length of the mill, resulting in selective grinding carried out on the largest particle sizes. This results in a minimum production of extreme fines or slimes and more effective grinding work as compared with a ball mill. One stage rod mill grinding is therefore suitable for preparation of feed to gravimetric ore dressing methods, certain flotation processes with slime problems and magnetic cobbing. Rod mills are frequently used as primary mills to produce suitable feed to the second grinding stage. Rod mills have usually a length/diameter ratio of at least 1.4.
Tube mills are in principle to be considered as ball mills, the basic difference being that the length/diameter ratio is greater (35). They are commonly used for surface cleaning or scrubbing action and fine grinding in open circuit.
In some cases it is suitable to use screened fractions of the material as grinding media. Such mills are usually called pebble mills, but the working principle is the same as for ball mills. As the power input is approximately directly proportional to the volume weight of the grinding media, the power input for pebble mills is correspondingly smaller than for a ball mill.
A dry process requires usually dry grinding. If the feed is wet and sticky, it is often necessary to lower the moisture content below 1 %. Grinding in front of wet processes can be done wet or dry. In dry grinding the energy consumption is higher, but the wear of linings and charge is less than for wet grinding, especially when treating highly abrasive and corrosive material. When comparing the economy of wet and dry grinding, the different costs for the entire process must be considered.
An increase in the mill speed will give a directly proportional increase in mill power but there seems to be a square proportional increase in the wear. Rod mills generally operate within the range of 6075 % of critical speed in order to avoid excessive wear and tangled rods. Ball and pebble mills are usually operated at 7085 % of critical speed. For dry grinding the speed is usually somewhat lower.
The mill lining can be made of rubber or different types of steel (manganese or Ni-hard) with liner types according to the customers requirements. For special applications we can also supply porcelain, basalt and other linings.
The mill power is approximately directly proportional to the charge volume within the normal range. When calculating a mill 40 % charge volume is generally used. In pebble and ball mills quite often charge volumes close to 50 % are used. In a pebble mill the pebble consumption ranges from 315 % and the charge has to be controlled automatically to maintain uniform power consumption.
In all cases the net energy consumption per ton (kWh/ton) must be known either from previous experience or laboratory tests before mill size can be determined. The required mill net power P kW ( = ton/hX kWh/ton) is obtained from
Trunnions of S.G. iron or steel castings with machined flange and bearing seat incl. device for dismantling the bearings. For smaller mills the heads and trunnions are sometimes made in grey cast iron.
The mills can be used either for dry or wet, rod or ball grinding. By using a separate attachment the discharge end can be changed so that the mills can be used for peripheral instead of overflow discharge.
Zambia's economy mainly includes agriculture, mining and services sectors. Among them, mining industry takes important position. After independence to the 1970s mid time, economic has rapid development. Since then, because the international mining market prices drooped and the government nationalized policy mistakes, the economy was in trouble. After new government took the office, it pushes forward the economic privatization and diversification, actively attract foreign investment, which maintains rapid economic growth. The mining industry is relatively developed and it is one of the main pillars of the national economy. Its main body is copper and cobalt mining and smelting.
Cobalt is a hard metal with steel grey and metallic luster. Its main physical and chemical parameters are close to iron, nickel, and iron clan elements. Cobalt is a kind of high melting point and good stability of magnetic hard metal. It has permanent magnetism, melting point is 1495 , boiling point is 2900 . With high temperature resistant, the mohs hardness is 5. It is the important material to manufacturing heat resistant alloy, hard alloy, anticorrosive alloy, magnetic alloy and all kinds of cobalt salt. It is widely used in aviation, aerospace, electronics, machinery manufacturing, chemical and ceramic industries. Therefore, it is an important strategic material. Physical and chemical properties of cobalt determine it is the production of heat-resistant alloy, hard alloy, anticorrosive alloy, magnetic alloy and important raw materials of various kinds of cobalt salts.
According to the cobalt characteristics, SBM experts recommends Zambia cobalt mining operators adopting the following crushing machines: cobalt jaw crusher as the primary crushing machine, cobalt cone crusher as the secondary crushing equipment, if there is need tertiary crusher machine, the impact crusher can be used.
We can see that the cobalt hardness is 5 and it belongs to the medium hard materials. The application of cobalt needs powder materials for further production. Cobalt jaw crusher is always used as the primary crushing machines. With the jaw crusher's help, large scale cobalt materials will be processed into small size and it is designed to exceed the primary crushing needs of customers in Zambia mining, quarrying and recycling industries. These machines are amongst the most advanced and reliable in the market and are highly productive in a variety of applications. With a combination of dynamic jaw profiles and highly efficient drive system these machines return some of the lowest operating costs in their class.
The secondary cobalt crusher machine is the cone crusher. It is suitable for secondary and tertiary crushing in the Zambia cobalt mining applications. The advanced technology will provide high volumes of excellently shaped product.
Depending on customers' production requirements in Zambia, SBM designs the mobile cobalt crushing plant which includes jaw crusher, cone crusher and the feeding & screening machines for local clients. This plant is built around robust, high capacity crushers, feeders and screens, enabling them to process practically the cobalt. The mobile cobalt crushing plant can work from one place to another freely and it does not take much time and costs.
This mobile crushing plant features an extensive range of track-mounted crushing plants designed for contracting, quarrying and crushing applications. For cobalt production, this mobile crushing plant can comprise two or three stage crushing plants. The mobile crushing plants and mobile screens are engineered and built to work together smoothly even at most demanding applications. Guarantee the profitability of your cobalt production by choosing the field proven, leading mobile processing equipment.
SBM grinding mill has the LM Vertical Grinding Mills, MTM Trapezium Grinder, SCM Ultrafine Mill, T130X Reinforced Ultrafine Mill, Ball Mill, Raymond Mill and MTW Milling Machine. These grinding machines are designed to meet the rugged grinding needs of the mining industry. Cobalt grinding mill contains a hydraulic motor designed to match power and for grinding applications.
A striking feature of the Galena Complex mineralization is that two entirely distinct types of utterly different ore mineralogy occur within the mineralized envelope. These are: 1) silver-copper veins and disseminations, dominated by tetrahedrite, and 2) silver-lead veins and disseminations, dominated by galena.Mineralization at the Galena Mine is typified by structurally controlled veins that can extend for a few thousand feet of depth and hundreds of feet of strike. The general strike is N 50 W, with steep dips to the south, but there are many local variations. Due to the complex threedimensional arrangement of the numerous veins, which include NW, NE and N-S trends, a two-dimensional graphic presentation is difficult.The veins principally contain silver, lead, copper and zinc in relatively simple mineralogy. Silver is the primary economic metal at the Galena Mine. Historically, the silver-copper veins, containing argentiferous tetrahedrite have been the focus of production at the Galena. The silver-copper ratio averages 30 to 35 ounces per percent copper. Typically, the silver-lead ratio of silver-lead ore at the Galena Mine is about 0.9 opt silver per 1.0 percent of lead.The mineralized veins at the Galena Mine occur along four major fracture systems and three major faults (South Argentine, Argentine, and Polaris). The veins generally strike east-west to northeast-southwest, and dip vertically to steeply to the south. Thickness ranges from a few inches to over fifteen feet.The vein fillings are a gangue of siderite with variable amounts of pyrite and quartz as blebs and stringers. The ore bearing sulfides are predominately galena, tetrahedrite and chalcopyrite, with pyrite.Wall rocks for the vein mineralization are not significantly mineralized except, where cut by narrow unnamed veins or stringers.The Silver Vein at the Galena Mine is one of the widest and most productive veins in the history of the mine. The vein cuts through quartzites and siltites of the Revett Formation for over 3,600 vertical feet with an average strike length of 1,000 feet. It can be as narrow as 1.0 foot and as wide as 15.0 feet but typically averages about 4 feet wide. The Silver Vein consists of massive siderite with pods of quartz and chalcopyrite and scattered blebs and stringers of tetrahedrite.The 185 Vein in the Galena Mine strikes east-west within a hard quartzite unit and consists of zones strongly enriched in silver bearing galena. Common accessory minerals are pyrite, ankerite, barite, and quartz. Only trace amounts of tetrahedrite are typically found within the vein.The fault-bounded veins are found within three major structures that cross through the Galena Mine. These veins include the 31, 72, 133, and 164 Veins hosted by the Polaris fault, the 117 Vein hosted by the South Argentine fault, and the 123 Vein hosted by the Argentine fault. The wall rocks encompassing these fault-controlled veins vary throughout the mine from soft siltite argillites to very hard quartzite.The Polaris fault is a major fault and strikes west-northwest to east-southeast and cuts through the middle of the Galena Mine, and south of the Coeur Mine. The Argentine and South Argentine faults are smaller east-west striking faults that lie north of the Polaris fault.The 72 Vein is a silver-enriched narrow vein bounded by the Polaris fault. It strikes at approximately N 75 degrees W and dips to the SW at -70 degrees. The genesis of the 72 Vein ore body is hypothesized to be the result of left lateral oblique movement along the Polaris fault that produced dilation zones in brittle quartzite units creating openings for silver concentrations from metal rich metamorphic fluids. The ore-bearing quartzites are bounded by more ductile siltite units that according to drill data cut off the mineralization along strike and up-dip. At the current drill limits the 72 Vein exhibits an ore grade strike length of 1,200 feet and a down-dip length of 900 feet. However, drill data between the 5500 and 5800 elevations reveals that the 72 Vein ore body is open down dip, showing increasing Ag grades within a thickening quartzite package.Mineralogically the 72 Vein is composed primarily of massive siderite veins that contain variable amounts of tetrahedrite, chalcopyrite, pyrite, and trace galena. These siderite veins and stringers are commonly found as brecciated angular to sub-rounded clasts set in a fault gouge matrix. Tetrahedrite is not always visible and can appear as black powder.The 117 Vein is hosted by the South Argentine fault. It is a strong siderite vein with small tetrahedrite blebs and parallel stringers. Hard quartzite in the hanging wall and siltite and argillite in the footwall bound the vein. Silver bearing tetrahedrite mineralization appears to rake flatly up dip to the northwest at about 40 degrees. The vein varies in width from 2 to 12 feet. In certain areas of the mine the vein will pinch out and only a black mineralized fault is present.The 123 Vein is a narrow siderite vein with small parallel tetrahedrite stringers. The vein is found within the Argentine fault, north of the Polaris fault and the 117 Vein. The hanging wall of the 123 Vein is a barren soft argillite while the footwall is a mineralized siltite-quartzite. The vein averages 2 to 4 feet wide and during mining the soft argillites in the hanging wall are found to be not competent which can cause dilution.The Coeur Mine, northwest of the Galena Mine, contains a Mineral Resource which is dominantly within the 425 Vein, the 400 Vein and the 356 Vein with Measured, Indicated and Inferred Resources on 12 other veins. The Coeur Mine had been idle since 1997 until Americas Silver rehabilitated the mine and resumed production in the second half of 2012 in the 425 Vein. Production ceased in 2014 due to low prices and the focus changed to silverlead mineralization.The Coeur Mine mineralization generally resembles the Galena Mine, in containing a complex vein set controlled largely by the pattern of faults, and the geology of the Revett quarzitic and argillitic units. Pre-1997 workings at Coeur attained a depth of 4,225 feet below surface (3900 Level), and were mostly in the 356, 400, and 483 Veins.It has been noted that the tetrahedrite of the Coeur Mine has a lower silver/copper ratio than that in the Galena Mine, about 15-20 ounces of silver per percent of copper.The disseminated mineralization consists of small stringers and disseminations of galena in wall rock sediments. This style of mineralization is locally termed "blue rock".Disseminated galena mineralization mainly occurs in thicker bedded, relatively more siliceous stratigraphic intervals. The disseminated mineralization ranges from narrow, weak zones less than a foot thick, to strongly mineralized zones which are several tens of feet thick. Disseminations vary from mottling and streaking to completely pervasive. Disseminated galena commonly follows lamination, where present, in siliceous rock. Galena grains in blue rock are usually quite fine, but variable. Blebs and pods of galena up to about inch comprise a minor part of the disseminated mineralization. Pyrite is often present in minor amounts. Disseminated mineralization is usually strong (greater than 6% Pb) around major lead veins. Major lead veins are mainly on the southwest (stratigraphically lower), side of the Caladay Zone. These veins, typically about 2 feet thick, may carry more than 40% Pb and relatively high pyrite (greater than 20%). The stronger intervals of blue rock in general contain galena-bearing stringers and pods. Stringers up to about 0.2 foot or 0.3 foot in width average roughly one per two to four feet in the strongest blue rock. These stringers consist of quartz, galena, pyrite, and siderite. Very high-grade stringers carrying more than 40% Pb are present.
The Galena Complex property covers 8,915 acres over an approximate area of 9 miles long east-west and 2 to 3 miles wide north-south. The Complex contains four shafts, all connected by deep underground workings. The Galena and #3 shafts are near the center of the property, while the Coeur shaft is approximately 1.5 miles northwest of the Galena shaft and the Caladay shaft is approximately 1.5 miles southeast of the Galena shaft. The Caladay shaft and workings are currently used as ventilation exhaust for the Galena workings. The current mining methods used at the Galena Complex are conventional cut and fill and mechanized cut and fill. Conventional cut and fill is done using the overhand method, utilizing hydraulically placed tailings (sand fill) as backfill, typically without the addition of cement. Mechanized cut and fill is done using both overhand and underhand methods. In the case of the overhand method, sand fill is used as backfill, typically without the addition of cement. For the underhand method, cement is typically added to the sand fill in order to provide the required strength to work underneath the placed backfill. Ore is hauled to either the Galena or #3 shafts via tracked locomotives and rail cars. Ore is loaded into the rail cars directly via ore chutes in stopes, pneumatic cavos, or in mechanized stoping areas, by diesel scooptrams/Load Haul Dump equipment. Waste associated with primary and secondary development is typically kept underground and placed as fill in old headings and open stopes. As needed, it can be hauled to the shaft, skipped to surface and placed on the existing surface waste rock storage facility. Ore is currently skipped to surface from several levels of the mine using either the #3 hoist. The Coeur mine and shaft is currently on care and maintenance. The Coeur shaft is used for ventilation purposes and provides an alternative means of egress.
Ore from the mine is hauled in 5-ton cars and directly tipped into a 400-ton coarse ore bin located adjacent to the plant. A Pioneer pan feeder feeds material to a 2-foot by 3-foot Kue Ken jaw crusher. The secondary crushing circuit consists of a 3 foot standard cone crusher in closed circuit with a 4-foot by 12-foot vibrating single deck horizontal screen. Minus 5/8 product is conveyed to a 300-ton fine ore bin.Ore is fed to a 9-foot by 12-foot ball mill, after passing over a weightometer. Grab samples are taken from the conveyor to determine daily moisture content. Ball mill discharge passes over a 3- foot by 6-foot vibrating screen prior to cyclone classification.
The Galena Complex consists of two processing plants, Galena and Coeur. The Coeur plant has been on care and maintenance since April 2016. The Galena processing plant follows a conventional flowsheet: Crushing and Screening. Grinding and Cycloning. Flotation Concentration. Concentrate Dewatering. Tailings Pumping for Sand Fill. Tailings Pumping for Osburn Tailings Storage Facility. Overall recoveries achieved in 2019 production at the Galena processing plant were approximately 95% for silver and 92% for lead. Although only a silver-lead concentrate is currently produced, the LOMP does include future mining from the silver-copper veins, at which time a silver- copper concentrate may be produced again.
Raymond millis mainly used as a piece of common mining equipment, which is mainly suitable for grinding various minerals, chemical, construction and other industries of more than 300kinds of materials with high fine powder processing. Besides, it is also a piece of very practical equipment for grinding charcoal or coal briquettes into charcoal and coal powderso that it is very useful in the charcoal production line.
The Raymond mill is very common and efficient in the shisha or hookah charcoaland bbq charcoal production line, which can crush and grind the charcoal blocks into fine powder, and then the charcoal powder can be mixed with the binder for making good charcoal briquettes like cubic or tablet hookah charcoal or barbecue charcoalbriquettes.The charcoal or coal powder which is ground by the Raymond mill is very suitable for mixing with the binder and then being formed into charcoal briquettes with many different shapes and these charcoal briquettes are very popular in the market.
Different from other charcoal crushers, this kind of charcoal grinder is more efficient for making fine charcoal powder which is especially good for making high-quality shisha charcoal with good appearance and good prices. This Raymond mill for grinding charcoal powder has a very compact structure which is mainly composed of a host machine, an analyzer, a blower, a finished cyclone separator, a micro powder cyclone separator, and an air pipe.
Among all the parts, the hostpart is the most import part whichis composed of a machine frame, inlet volute, blade and grinding roller and grinding ring and shell composition. Large bulk materials crushed by jaw crusher to the needed size are fed into storage hopper by a hoisting machine and then fed into grinding chamber of the main engine uniformly, quantitatively and continuously by electromagnetic vibrating feeder for grinding.
The ground material then is blown into separator by blower for classification. With the function of impellers in the separator, materials without meeting the requirements of the fineness are fallen into grinding chamber for grinding again; materials meeting the requirements of the fineness are blown into cyclone powder collector with airflow through pipelines for separation and collection. Powder from a discharging device is the finished product. Separated airflow is back to the blower through return duct on the top of the cyclone powder collector.
The grinding process of Raymond mill is widely used in metallurgy, building materials, mining materials, mining and other chemical field, suitable for barite, calcite, feldspar, talc, marble, limestone, dolomite, fluorite, lime, activated clay, activated carbon, bentonite, kaolin, gypsum, cement, phosphate rock, glass, manganese, titanium, copper, chrome ore, refractory materials, insulation materials, coal, coal, carbon black, clay, bone powder, titanium dioxide, iron oxide, quartz with hardness less than 7, and humidity below 6%, non-flammable and explosive mineral processing.
Over 300 kinds of chemical materials, construction and other industries can be processed with high fine powder, 60-300 mesh product size in the range of arbitrary regulation. So that nearly all the hard and brittle materials can be ground by this charcoal processing machine. In the charcoal production line, after the grinding in this charcoal machine, the charcoal powder can be further processed by a series of charcoal briquette machines, such asshisha charcoal press machine, BBQ charcoal briquette machineand honeycomb coal or charcoal press machine.
2, Resilient coupling between the main engine and the separator can reduce vibration and noise and improve the service life of the equipment. Because of connecting crushing, drying, grinding, classifying and transmission together with the simple system and compact layout, it covers about 50% of the area of the ball mill system and can be an outdoor arrangement, which can reduce the investment cost a lot.
3, Milling roller devices adopt superimposed multistage seal with excellent seal performance. Unique air circulation system with advanced dust remover carries the environmental protection concept through to the end.
4, Impeller devices with high density and high precision increase more than 50% of finished product yield under the same power. Efficient and energy-saving centrifugal induced draft fans improve the efficiency of induced draft fans greatly. Convenient impeller adjusting devices improve the precision of the finished product.
5, According to different requirements for the working capacities of the users, this charcoal grinding machine can be different types and models, and we can also customize the type the customers need. Besides, we can also provide the supporting equipment such as screw conveyor, stock bin and the accessories of this Raymond mill.
Shuliy Machinery not only provides high-quality machines but also provides comprehensive after-sales service. We have been focusing on the charcoal machinery industry for nearly 20 years and have rich experience in designing and manufacturing large and medium-sized charcoal machines to meet the needs of various customers. At the same time, according to the requirements of customers, we can provide services such as plant construction plan, market analysis, and best product formula. learn more >>>
This ball mill is typically designed to grind mineral ores and other materials with different hardness, and it is widely used in different fields, such as ore dressing, building material field, chemical industry, etc. Due to the difference of its slurry discharging method, it is divided to two types: grid type ball mill and overflow type ball mill.
Compared with grid type ball mill, overflow type ball mill can grind materials finer even though its grinding time is usually longer. So it can make finer particle products. Hence the grid type ball mill is mainly used for primary stage of grinding while overflow type ball mill is mainly used for the secondary grinding.
Ball mill Advantages: 1Jack-up device, easy maintenance; 2The hydrostatic and hydrodynamic bearings ensure the smooth operation; 3Low speed transmission is easy for starting and maintenance; 4The oil-mist lubrication device guarantees reliable performance of bearings; 5The air clutch adopts the flexible start-up model./5According to the customer demand, manganese steel liner and wear-resistant rubber liner can be customized with good wear resistance, long service life and easy maintenance.
The grinding system uses either 'open circuit' or 'closed circuit'. In an open circuit system, the feed rate of materials is adjusted to achieve the desired fineness of the product. In a closed circuit system, coarse particles are separated from the finer ones and sent back for further grinding.
Prominer has been devoted to mineral processing industry for decades and specializes in mineral upgrading and deep processing. With expertise in the fields of mineral project development, mining, test study, engineering, technological processing.
Ball mill is the key equipment for grinding materials. those grinding mills are widely used in the mining process, and it has a wide range of usage in grinding mineral or material into fine powder, such as gold, ironzinc ore, copper, etc.
JXSC Mining produce reliable effective ball mill for long life and minimum maintenance, incorporate many of the qualities which have made us being professional in the mineral processing industry since 1985. Various types of ball mill designs are available to suit different applications. These could include but not be restricted to coal mining grate discharge, dry type grinding, wet mineral grinding, high-temperature milling operations, stone & pebble milling.
A ball mill grinds ores to an end product size of thirty-five mesh or finer. The feeding material to a ball mill is treated by: Single or multistage crushing and screening Crushing, screening, and/or rod milling Primary crushing and autogenous/semi-autogenous grinding.
Normal feed sizes: eighty percent of six millimeters or finer for hard rocker eighty percent of twenty-five millimeters or finer for fragile rocks (Larger feed sizes can be tolerated depending on the requirements).
The ratio of machine length to the cylinder diameter of cylindrical type ball mills range from one to three through three to one. When the length to diameter ratio is two to one or even bigger, we should better choose the mill of a Tube Mill.
Grinding circuit design Grinding circuit design is available, we experienced engineers expect the chance to help you with ore material grinding mill plant of grinding circuit design, installation, operation, and optimization. The automatic operation has the advantage of saving energy consumption, grinding media, and reducing body liner wear while increasing grinding capacity. In addition, by using a software system to control the ore grinding process meet the requirements of different ore milling task.
The ball mill is a typical material grinder machine which widely used in the mineral processing plant, ball mill performs well in different material conditions either wet type grinding or dry type, and to grind the ores to a fine size.
Main ball mill components: cylinder, motor drive, grinding medium, shaft. The cylinder cavity is partial filling with the material to be ground and the metal grinding balls. When the large cylinder rotating and creating centrifugal force, the inner metal grinding mediums will be lifted to the predetermined height and then fall, the rock material will be ground under the gravity force and squeeze force of moving mediums. Feed material to be ground enters the cylinder through a hopper feeder on one end and after being crushed by the grinding medium is discharged at the other end.
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