ball mills in ore plants

ball mills - metso outotec

ball mills - metso outotec

With more than 100 years of experience in developing this technology. Metso Outotec has designed, manufactured and installed over 8,000 ball and pebble mills all over the world for a wide range of applications. Some of those applications are grate discharge, peripheral discharge, dry grinding, special length to diameter ratio, high temperature milling oprations and more.

All equipment adheres to the applicable standards set by ASTM, NEMA, AGMA, AWS, and ANSI. Reliable and effective grinding mills includes being safe throughout. When the mills are quoted we make sure to include any and all safety components needed.

Metso Outotec process engineers welcome the opportunity to assist you with circuit and circuit control design as well as start-up, operation, and optimization of the milling plant. Automatic operation saves power, grinding media, and liner wear, while increasing capacity.

To ensure top-of-the-line operation, software can be developed to suit the most complicated circuits and complex ores. Our engineers can specify or supply computer control systems for your sophisticated circuit needs. These controls are feasible for also smaller installations.

Three types of tests are available for mill power determinations. In most cases one of two bench scale tests is adequate. First, a Jar Mill grindability test requires a 5 lb. (2 kg) sample and produces a direct measured specific energy (net Hp-hr/t) to grind from the design feed size to the required product size. The second test, a Bond Work Index determination, results in a specific energy value (net Hp-hr/t) from an empirical formula.

If time permits and the user wishes, grinding circuits are set up and continuous tests are run to simulate plant operation. These tests require two or three days for each ore type and approximately 1,000 pounds of material for each day of testing. Variations in ore hardness or circuit design may require larger samples.

Metso Outotec Premier horizontal grinding mills are customized and optimized grinding solutions built on advanced simulation tools and unmatched expertise. A Metso Outotec Premier horizontal grinding mill is able to meet any projects needs, even if it means creating something novel and unseen before.

Metso Outotec Select horizontal grinding mills are a pre-engineered range of class-leading horizontal grinding mills that were selected by utilizing our industry leading experience and expertise. With developing a pre-engineered package, this eliminates a lot of the time and costs usually spent in the engineering and selection stages.

what are the differences between ball mill and rod mill? | fote machinery

what are the differences between ball mill and rod mill? | fote machinery

Ball mill and rod mill are the common grinding equipment applied in the grinding process. They are similar in appearance and both of them are horizontal cylindrical structures. Their cylinders are equipped with grinding medium, feeder, gears, and transmission device.

The working principle of ball mill and rod mill machine is similar, too. That is, the cylinder drives the movement of the grinding medium (lifting the grinding medium to a certain height then dropping). Under the action of centrifugal force and friction, the material is impacted and ground to required size, so as to realize the operation of mineral grinding.

Grate discharge ball mill can discharge material through sieve plate, with the advantage of the low height of the discharge port which can make the material pass quickly so tha t to avoid over-grinding of material. Under the same condition, it has a higher capacity and can save more energy than other types of mills;

It is better to choose a grate discharge ball mill when the required discharge size is in the range of 0.2 to 0.3 mm. Grate discharge ball mill is usually applied in the first grinding system because it can discharge the qualified product immediately.

Overflow discharge ball mill can grind ores into the size under 0.2 mm, so it is very suitable for the second grinding system. The capacity of it is about 15% lower than grate discharge ball mill in the same specification, and the loaded grinding medium is also less than that one.

It can be divided into three types of rod mills according to the discharge methods, center and side discharge rod mill, end and side discharge rod mill and shaft neck overflow discharge rod mill.

It is fed through the shaft necks in the two ends of rod mill, and discharges ore pulp through the port in the center of the cylinder. Center and side discharge rod mill can grind ores coarsely because of its structure.

This kind of rod mill can be used for wet grinding and dry grinding. "A rod mill is recommended if we want to properly grind large grains, because the ball mill will not attack them as well as rod mills will."

It is fed through one end of the shaft neck, and with the help of several circular holes, the ore pulp is discharged to the next ring groove. The rod mill is mainly used for dry and wet grinding processes that require the production of medium-sized products.

The diameter of the shaft neck is larger than the diameter of the feeding port about 10 to 20 centimeters, so that the height difference can form a gradient for ore pulp flow. There is equipped with a spiral screen in the discharge shaft neck to remove the impurities.

It has high toughness, good manufacturability and low price. The surface layer of high manganese steel will harden rapidly under the action of great impact or contact. The harder index is five to seven times higher than other materials, and the wear resistance is greatly improved.

It has high toughness, good manufacturability and low price. The surface layer of high manganese steel will harden rapidly under the action of great impact or contact. The harder index is five to seven times higher than other materials, and the wear resistance is greatly improved.

It is made of several elements such as chromium and molybdenum, which has high hardness and good toughness. Under the same work condition, the service of this kind of ball is one time longer than the high manganese steel ball.

After the professional technology straightening and quenching processing process, a high carbon steel rod has high hardness, excellent performance, good wear resistance and outstanding quality.

The steel ball of ball mill and the mineral material are in point contact, so the finished product has a high degree of fineness, but it is also prone to over-grinding. Therefore, it is suitable for the production with high material fineness and is not suitable for the gravity beneficiation of metal ores.

The steel rod and the material are in line or surface contact, and most of the coarse particles are first crushed and then ground. Therefore, the finished product is uniform in quality, excellent in particle size, and high in qualification rate.

The cylinder shape of the rod mill and the ball mill is different: the cylinder of the rod mill is a long type, and the floor area is large. The ratio of the length to the diameter of the cylinder is generally 1.5 to 2.0;

The cylinder of the ball mill is a barrel or a cone. And the ratio of the length to the diameter of the cylinder is small, and in most cases the ratio is only slightly larger than 1, and the floor area is small, too.

The above is the main content of this article. The ball mill and the rod mill are the same type of machine on the appearance, but there are still great differences in the interior. It is very necessary to select a suitable machine for the production to optimize the product effect and maximize its efficiency.

As a leading mining machinery manufacturer and exporter in China, we are always here to provide you with high quality products and better services. Welcome to contact us through one of the following ways or visit our company and factories.

Based on the high quality and complete after-sales service, our products have been exported to more than 120 countries and regions. Fote Machinery has been the choice of more than 200,000 customers.

ball mill operation -grinding circuit startup & shutdown procedure

ball mill operation -grinding circuit startup & shutdown procedure

After the grinding circuit has been brought up to normal operating conditions, the operator must monitor the various process variables and alarms. Most of these variables are monitored in the mill control room, however, the operator is also required to sample and analyse process streams and read local indicators.

The ball mill is susceptible to variations in ore hardness resulting in various grinds at constant throughput, or alternatively, various tonnages at constant grind. The variation in grind is not directly determined. However, a changing cyclone overflow density, at a constant tonnage rate and feed density, would be indicative of changing ore hardness and in that case the tonnage fed to the ball mill should be changed accordingly.

The ore feed rate to the ball mill is controlled by the weightometer located on the mill feed conveyor which can be manually adjusted with in the control room to give a constant weight reading. The signal from the weightometer increases or decreases the belt feeder speed and adjusts the water addition to the ball mill (as a function of the actual weight reading). Both weight control and the proportion of water can be adjusted in the control room.

The water rationing controller must be adjusted programmatically to give the desired ball mill discharge density (normally 60-65% solids). The ball mill discharge density should be checked manually at regular intervals and adjustment made to water ratio controller setpoint to adjust the ball mill discharge density.

The grinding circuit operator must ensure that the ball mill runs properly loaded and gives the correct ore grind. A major practical indication of mill loading is the sound made by the mill. A properly loaded mill will have a deep rhythmic roar, while an under loaded mill will have a metallic rattling type noise and an overloaded mill will be quite silent.

The operator must manually measure the cyclone overflow and underflow densities regularly. An increase in overflowdensity is indicative of softer ore and will soon be accompanied by a lowering of power draw at the mill and a change of sound indicating that the mill is becoming under loaded. To compensate, feed tonnage must be increased. Similarity, a decrease in the cyclone overflow density is indicative of harder ore and this will be accompanied eventually by a coking of the mill. Feed to the ball mill must be reduced.

In the event of an emergency, the mill feed conveyor is shut down individually or by stopping the operating cyclone feed pump. The ball mill must be shut down separately. All equipmentshutdowns are performed locally or from the MCC located in the mill control room.

ball mills

ball mills

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.

cemtec - mining technology | mining news and views updated daily

cemtec - mining technology | mining news and views updated daily

CEMTEC is recognised worldwide as a specialist in wet and dry grinding technologies for the most wide-ranging bulk materials, industrial minerals and ore. In addition to systems for grinding processes, CEMTECs product range also includes solutions for thermal treatment (like calcinations, drying and cooling), and mechanical treatment (such as mixing, washing, conditioning, granulating and pelletising) for bulk materials, minerals and ore. CEMTEC offers complete turnkey projects as well as single machinery. Grinding mills and grinding plants Comminution solutions developed by CEMTEC include ball mills, rod mills, pebble mills, autogenous (AG) and semi-autogenous (SAG) mills. CEMTEC tube mills are available in a wide variety of designs, sizes and power capacities. Each machine is tailor-made according to the requirements of individual customers. CEMTECs product range also includes a number of special solutions for customers individual requirements. The design and size of CEMTEC grinding mills and grinding plants depends on the raw material used and the product characteristics required. CEMTECs qualified staff has the know-how and all essential facilities and tools to develop, in close co-operation with the customer, a perfect solution for each clients success.

In addition to systems for grinding processes, CEMTECs product range also includes solutions for thermal treatment (like calcinations, drying and cooling), and mechanical treatment (such as mixing, washing, conditioning, granulating and pelletising) for bulk materials, minerals and ore. CEMTEC offers complete turnkey projects as well as single machinery. Grinding mills and grinding plants Comminution solutions developed by CEMTEC include ball mills, rod mills, pebble mills, autogenous (AG) and semi-autogenous (SAG) mills. CEMTEC tube mills are available in a wide variety of designs, sizes and power capacities. Each machine is tailor-made according to the requirements of individual customers. CEMTECs product range also includes a number of special solutions for customers individual requirements. The design and size of CEMTEC grinding mills and grinding plants depends on the raw material used and the product characteristics required. CEMTECs qualified staff has the know-how and all essential facilities and tools to develop, in close co-operation with the customer, a perfect solution for each clients success.

Comminution solutions developed by CEMTEC include ball mills, rod mills, pebble mills, autogenous (AG) and semi-autogenous (SAG) mills. CEMTEC tube mills are available in a wide variety of designs, sizes and power capacities. Each machine is tailor-made according to the requirements of individual customers. CEMTECs product range also includes a number of special solutions for customers individual requirements. The design and size of CEMTEC grinding mills and grinding plants depends on the raw material used and the product characteristics required. CEMTECs qualified staff has the know-how and all essential facilities and tools to develop, in close co-operation with the customer, a perfect solution for each clients success.

The design and size of CEMTEC grinding mills and grinding plants depends on the raw material used and the product characteristics required. CEMTECs qualified staff has the know-how and all essential facilities and tools to develop, in close co-operation with the customer, a perfect solution for each clients success.

The CTM and CTC fine classifier series are based on the latest findings (fourth generation) in the field of classification technology and whose design was geared to optimise production, operating and maintenance costs. This is achieved by new combinations of rotor geometry and improved flow design. It is expressed in classifying efficiency, low bypass of fines and the resulting reduced pulverisation and classification energy. The CEMTEC CTC separators are designed specifically for cement and use with other materials with a similar range of fineness. The CEMTEC CTM classifiers are designed for finer applications, such as industrial minerals in the filler industry. Rotary drums for mineral processing Besides grinding equipment, CEMTEC offers rotary equipment like rotary dryers and kilns for thermal treatment of minerals. Dryers are available as single and double-shell dryers in a wide variety of designs and sizes. Rotary scrubbers for iron ore beneficiation plants as well as granulating drums, pelletising discs and all kind of rotating equipment are also included in CEMTECs wide range of products. Wet and dry grinding tests The parameters for each individual application can be verified in CEMTECs pilot test plant and laboratory. With this kind of pilot test CEMTEC can guarantee its clients that the selected solution will perform according to the customers requirements and that the selected processing equipment matches with the required process conditions. With this pilot test plant CEMTEC is able to offer wet and dry grinding tests in open and closed circuit as well as grinding tests with vertical roller mills, batch tests and drying tests. A multiplicity of other material testing methods complete CEMTECs testing portfolio. Turnkey wet and dry grinding technologies CEMTEC manages projects for the mining industry from start to finish, right from planning through to commissioning. Their solutions are based on the individual demands of their customers and the characteristics of the raw material. Testing of the customers raw material in CEMTECs in-house pilot test plant and laboratory is the base of each individual, tailor-made technical and economic solution. White Papers Wet and Dry Grinding Technologies CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person. Press Releases CEMTEC to Attend POWTECH 2013 CEMTEC is proud to announce that we will be attending our first major trade show... Company Links www.cemtec.at

It is expressed in classifying efficiency, low bypass of fines and the resulting reduced pulverisation and classification energy. The CEMTEC CTC separators are designed specifically for cement and use with other materials with a similar range of fineness. The CEMTEC CTM classifiers are designed for finer applications, such as industrial minerals in the filler industry. Rotary drums for mineral processing Besides grinding equipment, CEMTEC offers rotary equipment like rotary dryers and kilns for thermal treatment of minerals. Dryers are available as single and double-shell dryers in a wide variety of designs and sizes. Rotary scrubbers for iron ore beneficiation plants as well as granulating drums, pelletising discs and all kind of rotating equipment are also included in CEMTECs wide range of products. Wet and dry grinding tests The parameters for each individual application can be verified in CEMTECs pilot test plant and laboratory. With this kind of pilot test CEMTEC can guarantee its clients that the selected solution will perform according to the customers requirements and that the selected processing equipment matches with the required process conditions. With this pilot test plant CEMTEC is able to offer wet and dry grinding tests in open and closed circuit as well as grinding tests with vertical roller mills, batch tests and drying tests. A multiplicity of other material testing methods complete CEMTECs testing portfolio. Turnkey wet and dry grinding technologies CEMTEC manages projects for the mining industry from start to finish, right from planning through to commissioning. Their solutions are based on the individual demands of their customers and the characteristics of the raw material. Testing of the customers raw material in CEMTECs in-house pilot test plant and laboratory is the base of each individual, tailor-made technical and economic solution. White Papers Wet and Dry Grinding Technologies CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person. Press Releases CEMTEC to Attend POWTECH 2013 CEMTEC is proud to announce that we will be attending our first major trade show... Company Links www.cemtec.at

The CEMTEC CTC separators are designed specifically for cement and use with other materials with a similar range of fineness. The CEMTEC CTM classifiers are designed for finer applications, such as industrial minerals in the filler industry. Rotary drums for mineral processing Besides grinding equipment, CEMTEC offers rotary equipment like rotary dryers and kilns for thermal treatment of minerals. Dryers are available as single and double-shell dryers in a wide variety of designs and sizes. Rotary scrubbers for iron ore beneficiation plants as well as granulating drums, pelletising discs and all kind of rotating equipment are also included in CEMTECs wide range of products. Wet and dry grinding tests The parameters for each individual application can be verified in CEMTECs pilot test plant and laboratory. With this kind of pilot test CEMTEC can guarantee its clients that the selected solution will perform according to the customers requirements and that the selected processing equipment matches with the required process conditions. With this pilot test plant CEMTEC is able to offer wet and dry grinding tests in open and closed circuit as well as grinding tests with vertical roller mills, batch tests and drying tests. A multiplicity of other material testing methods complete CEMTECs testing portfolio. Turnkey wet and dry grinding technologies CEMTEC manages projects for the mining industry from start to finish, right from planning through to commissioning. Their solutions are based on the individual demands of their customers and the characteristics of the raw material. Testing of the customers raw material in CEMTECs in-house pilot test plant and laboratory is the base of each individual, tailor-made technical and economic solution. White Papers Wet and Dry Grinding Technologies CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person. Press Releases CEMTEC to Attend POWTECH 2013 CEMTEC is proud to announce that we will be attending our first major trade show... Company Links www.cemtec.at

The CEMTEC CTM classifiers are designed for finer applications, such as industrial minerals in the filler industry. Rotary drums for mineral processing Besides grinding equipment, CEMTEC offers rotary equipment like rotary dryers and kilns for thermal treatment of minerals. Dryers are available as single and double-shell dryers in a wide variety of designs and sizes. Rotary scrubbers for iron ore beneficiation plants as well as granulating drums, pelletising discs and all kind of rotating equipment are also included in CEMTECs wide range of products. Wet and dry grinding tests The parameters for each individual application can be verified in CEMTECs pilot test plant and laboratory. With this kind of pilot test CEMTEC can guarantee its clients that the selected solution will perform according to the customers requirements and that the selected processing equipment matches with the required process conditions. With this pilot test plant CEMTEC is able to offer wet and dry grinding tests in open and closed circuit as well as grinding tests with vertical roller mills, batch tests and drying tests. A multiplicity of other material testing methods complete CEMTECs testing portfolio. Turnkey wet and dry grinding technologies CEMTEC manages projects for the mining industry from start to finish, right from planning through to commissioning. Their solutions are based on the individual demands of their customers and the characteristics of the raw material. Testing of the customers raw material in CEMTECs in-house pilot test plant and laboratory is the base of each individual, tailor-made technical and economic solution. White Papers Wet and Dry Grinding Technologies CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person. Press Releases CEMTEC to Attend POWTECH 2013 CEMTEC is proud to announce that we will be attending our first major trade show... Company Links www.cemtec.at

Besides grinding equipment, CEMTEC offers rotary equipment like rotary dryers and kilns for thermal treatment of minerals. Dryers are available as single and double-shell dryers in a wide variety of designs and sizes. Rotary scrubbers for iron ore beneficiation plants as well as granulating drums, pelletising discs and all kind of rotating equipment are also included in CEMTECs wide range of products. Wet and dry grinding tests The parameters for each individual application can be verified in CEMTECs pilot test plant and laboratory. With this kind of pilot test CEMTEC can guarantee its clients that the selected solution will perform according to the customers requirements and that the selected processing equipment matches with the required process conditions. With this pilot test plant CEMTEC is able to offer wet and dry grinding tests in open and closed circuit as well as grinding tests with vertical roller mills, batch tests and drying tests. A multiplicity of other material testing methods complete CEMTECs testing portfolio. Turnkey wet and dry grinding technologies CEMTEC manages projects for the mining industry from start to finish, right from planning through to commissioning. Their solutions are based on the individual demands of their customers and the characteristics of the raw material. Testing of the customers raw material in CEMTECs in-house pilot test plant and laboratory is the base of each individual, tailor-made technical and economic solution. White Papers Wet and Dry Grinding Technologies CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person. Press Releases CEMTEC to Attend POWTECH 2013 CEMTEC is proud to announce that we will be attending our first major trade show... Company Links www.cemtec.at

Rotary scrubbers for iron ore beneficiation plants as well as granulating drums, pelletising discs and all kind of rotating equipment are also included in CEMTECs wide range of products. Wet and dry grinding tests The parameters for each individual application can be verified in CEMTECs pilot test plant and laboratory. With this kind of pilot test CEMTEC can guarantee its clients that the selected solution will perform according to the customers requirements and that the selected processing equipment matches with the required process conditions. With this pilot test plant CEMTEC is able to offer wet and dry grinding tests in open and closed circuit as well as grinding tests with vertical roller mills, batch tests and drying tests. A multiplicity of other material testing methods complete CEMTECs testing portfolio. Turnkey wet and dry grinding technologies CEMTEC manages projects for the mining industry from start to finish, right from planning through to commissioning. Their solutions are based on the individual demands of their customers and the characteristics of the raw material. Testing of the customers raw material in CEMTECs in-house pilot test plant and laboratory is the base of each individual, tailor-made technical and economic solution. White Papers Wet and Dry Grinding Technologies CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person. Press Releases CEMTEC to Attend POWTECH 2013 CEMTEC is proud to announce that we will be attending our first major trade show... Company Links www.cemtec.at

The parameters for each individual application can be verified in CEMTECs pilot test plant and laboratory. With this kind of pilot test CEMTEC can guarantee its clients that the selected solution will perform according to the customers requirements and that the selected processing equipment matches with the required process conditions. With this pilot test plant CEMTEC is able to offer wet and dry grinding tests in open and closed circuit as well as grinding tests with vertical roller mills, batch tests and drying tests. A multiplicity of other material testing methods complete CEMTECs testing portfolio. Turnkey wet and dry grinding technologies CEMTEC manages projects for the mining industry from start to finish, right from planning through to commissioning. Their solutions are based on the individual demands of their customers and the characteristics of the raw material. Testing of the customers raw material in CEMTECs in-house pilot test plant and laboratory is the base of each individual, tailor-made technical and economic solution. White Papers Wet and Dry Grinding Technologies CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person. Press Releases CEMTEC to Attend POWTECH 2013 CEMTEC is proud to announce that we will be attending our first major trade show... Company Links www.cemtec.at

With this pilot test plant CEMTEC is able to offer wet and dry grinding tests in open and closed circuit as well as grinding tests with vertical roller mills, batch tests and drying tests. A multiplicity of other material testing methods complete CEMTECs testing portfolio. Turnkey wet and dry grinding technologies CEMTEC manages projects for the mining industry from start to finish, right from planning through to commissioning. Their solutions are based on the individual demands of their customers and the characteristics of the raw material. Testing of the customers raw material in CEMTECs in-house pilot test plant and laboratory is the base of each individual, tailor-made technical and economic solution. White Papers Wet and Dry Grinding Technologies CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person. Press Releases CEMTEC to Attend POWTECH 2013 CEMTEC is proud to announce that we will be attending our first major trade show... Company Links www.cemtec.at

CEMTEC manages projects for the mining industry from start to finish, right from planning through to commissioning. Their solutions are based on the individual demands of their customers and the characteristics of the raw material. Testing of the customers raw material in CEMTECs in-house pilot test plant and laboratory is the base of each individual, tailor-made technical and economic solution. White Papers Wet and Dry Grinding Technologies CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person. Press Releases CEMTEC to Attend POWTECH 2013 CEMTEC is proud to announce that we will be attending our first major trade show... Company Links www.cemtec.at

CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person.

CEMTEC operates on the basis of individual responsibility. Every member of our team has the right to make high-level decisions. The entire responsibility for a project, from planning to commissioning, rests with a single person.

buy ore ball mill for mineral processing | iron & gold ore ball mill

buy ore ball mill for mineral processing | iron & gold ore ball mill

Ore ball mill sometimes called ore grinding mill, is generally used in mineral processing concentrator, processing materials include iron ore, copper ore, gold ore, molybdenum ore and all kinds of nonferrous metal ore. The core function of the ore ball mill is to grind the materials, and also to separate and screen different mineral materials, and to separate the tailings, which is very important to improve the quality of the selected mineral materials.

The ore ball mill designed by our company, which is represented by gold ore ball mill and iron ore ball mill, is manufactured with high-quality materials and advanced technology. They have the characteristics of high efficiency, energy-saving, green environmental protection, simple operation, stable operation, and low failure rate, and have a good reputation in the industry.

The crushing ratio of the ore grinding mill is very large, and it is easy to adjust the fineness of the grinding product. The ore grinding mill has strong sealing performance and can be operated under negative pressure. It is widely used in chemical industry, metallurgy, new building materials and other fields.

We offer different types of ore ball mills for customers to choose from. There are energy-saving ore ball mill, dry and wet ball mill,wet grate ball mill, andwet overflow ball mill. Customers can choose to purchase according to material conditions.

Mineral processing is the most important link in the entire production process of mineral products. It is a process of separating useful minerals from useless minerals (usually called gangue) or harmful minerals in a mineral raw material by physical or chemical methods, or a process of separating multiple useful minerals The process is called mineral processing, also known as ore processing.

The first step in the ore processing is to select the useful minerals. In order to select useful minerals from ore, the ore must be crushed first. Sometimes, in order to meet the requirements of subsequent operations on the particle size of materials, it is necessary to add a certain ore grinding operation in the process.

The preparation before beneficiation is usually carried out in two stages: crushing screening operation and mineral classification operation. Crusher and ore ball mill are the main equipment in these two stages.

As a ball mills supplier with 22 years of experience in the grinding industry, we can provide customers with types of ball mill, vertical mill, rod mill and AG/SAG mill for grinding in a variety of industries and materials.

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