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Why buy a brand new ball mill when we have high-quality used and refurbished ball mills for sale? Well-made industrial equipment from top manufacturers maintain their value and save your company or industry substantially.

Ball mills are a fundamental part of the manufacturing industry in the USA as well as around the world. Ball mills crush material into various sizes and extract resources from mined materials. Pebble mills are a type of ball mill and are also used to reduce the size of hard materials, down to 1 micron or less.

Because of their fairly simple design, ball mills and pebble mills are less likely to need costly repairs (unlike other crushing or extraction equipment) making them an attractive option for businesses on a budget.

Unused 24 x 41 Polysius EGL Ball Mill. Steel Lined. Twin 7MW Electric Motor Drives, 14MW/11kV Power Supply Unit. Twin Combiflex Fixed Speed Gear Drive. Auxiliary Drive Motors, Lubrication Unit Fixed Bearing and Lubrication Unit Floating Bearing, Frozen Charge Protection System, Vibration Sensors for COMBIFLEX, Dam Ring, Permanent installed Centrifuge for Fixed Bearing, Closed Circuit Chiller Unit, Insurance and Commissioning Spares, Special Tools. Qty 2 Available.

Used 11.5' diameter X 17' long ball mill. Manufactured by KVS (Kennedy Van Saun). 1000 HP open winding synchronous motor. Features trommel discharge and feed tank. Refurbished in 2013, which included installation of new oil jacking system, oil lube system for Babbitt bearings, new titanium steel water jet-machined discharge grates, and motor refurbishment. Set of new babbit bearings available. Previously operated as a closed circuit dry mill with grinding capacity of 40 metric tons per hour with output fineness of >80% passing 200 mesh. Motor operating speed of 15.8 RPM charged with approximately 78 tons of 1", 2" and 3" steel balls. Last used at a phosphate processing facility and in good condition.

Used 8' x 10' Epworth 200 HP jacketed steel ball mill, approximately 8' diameter x 10' long, jacketed chamber, gear and pinion driven with approximately 200 motor drive, on stands, Serial# K-0845.

Used 175HP Hosokawa Alpine Super Orion Continuous Ball mill. Model 195/495 CLKE. Alumina Oxide lined. 195 cm (76")inner diameter x 495 cm (194") long drum, periphery dry discharge with adjustable discharge openings, enclosed discharge housing, direct driven thru gearbox. 175HP 460 volt motor with VFD motor controller. Serial# C1198474. Built 2012.

Used 6' x 8' Paul Abbe jacketed 100 HP steel ball mill, approximately 6' diameter x 8' long, jacketed chamber, gear and pinion driven with approximately 100 motor drive, on stands.

Unused 5' diameter X 6' long Steel Lined Ball Mill, manufactured by Patterson Industries, Type D, non-jacketed, with AR400 steel liners. Includes 30 HP, 3 phase, 60 Hz, 230-460 V, 1725 RPM motor. Mill drive is integrally coupled to horizontal parallel shafted helical gear reducer. Continuous type, with product feeding through spiral inlet trunnion and exiting through the discharge end trunnion. Features cylinder manway access door for cleaning. Internal volume measures approximately 839 USG (112 CF). Mill shell is lined with (24) 1/4" thick liner plates, each head lined with (8) 3/8" thick pie-shaped liner plates. Mounted on stand with approximately 66" clearance between the mill cylinder and floor. Mills were intended for use in glass particle size reduction but were never installed. Manufactured in 2019, units are still in factory plastic wrap and in new condition. (Qty - 2 available)

Used 5 ft. dia. x 6 ft. (Approx 120 Cu.Ft) Patterson Pebble Mill. Alumina brick lining. On stand with 20 HP motor and gear reduced drive with brake. Bull gear and pinion. Babbit bearings. Door is polyurethane and has a drain with plug.

Used 4' x 5' (345 Gallon Total/210 Gallon Working) Ball Mill. Mfg Steveco. Steel Lining. Jacketed. 20 HP (460V/60Hz/3ph) Gear Reduced heavy duty drive on high stands. Solid door and discharge door.

Used Paul O. Abbe One Piece Ceramic Ball Mill, Model JM-300. Non-Jacketed chamber approximate 24.8" diameter x 39.5" long. Vessel volume 300 liter (79 gallons). Approximate 5" charge and discharge port with cover. Driven by a 3 HP, 3/60/208-230/460 volt 1760 rpm motor with a shaft mounted Sumitomo Model 203E-25 reducer. Approximate 32 rpm drum speed. Includes a control panel with an ABB drive. Mounted on a common carbon steel frame legs. Serial # 0830032JM. Built 2008.

Used 28 Gallon Paul O. Abbe Ceramic Jar / Ball Mill. Approximate 3.7 Cubic Feet. Approximate 20" diameter x 20" straight side. Includes motor and cage. Mounted on a carbon steel frame with safety cage.

Used 30 gallon Paul O. Abbe Jar Mill. Porcelain jar 21" diameter x 18" straight side. Driven by 1hp, 1/60/115/230 volt, 1740 rpm motor thru a reducer, ratio 9.3 to 1. Inlet & outlet with cover and clamp. Mounted on carbon steel legs with a discharge housing. Serial#84876

Used 25 Gallon Norton Chemical Process Products Jar Mill. Porcelain jar 20" diameter x 20" straight side. Driven by 1hp, 3/60/230/460 volt, 1730 rpm motor thru a reducer, no ratio. Inlet & outlet with cover and clamp. Mounted on carbon steel legs with a discharge housing. Serial# AV-83104.

Used 35.30 Gallon Paul O. Abbe Jar Mill. Model 5A Porcelain jar 22" diameter x 20" straight side. Driven by 1hp, 3/60/230/460 volt, 1745 rpm motor thru a reducer, ratio 25 to 1. Inlet & outlet with cover and clamp. Mounted on carbon steel legs with a discharge housing. Serial#A41563.

Unused 24 x 41 Polysius EGL Ball Mill. Steel Lined. Twin 7MW Electric Motor Drives, 14MW/11kV Power Supply Unit. Twin Combiflex Fixed Speed Gear Drive. Auxiliary Drive Motors, Lubrication Unit Fixed Bearing and Lubrication Unit Floating Bearing, Frozen Charge Protection System, Vibration Sensors for COMBIFLEX, Dam Ring, Permanent installed Centrifuge for Fixed Bearing, Closed Circuit Chiller Unit, Insurance and Commissioning Spares, Special Tools. Qty 2 Available.

Used 11.5' diameter X 17' long ball mill. Manufactured by KVS (Kennedy Van Saun). 1000 HP open winding synchronous motor. Features trommel discharge and feed tank. Refurbished in 2013, which included installation of new oil jacking system, oil lube system for Babbitt bearings, new titanium steel water jet-machined discharge grates, and motor refurbishment. Set of new babbit bearings available. Previously operated as a closed circuit dry mill with grinding capacity of 40 metric tons per hour with output fineness of >80% passing 200 mesh. Motor operating speed of 15.8 RPM charged with approximately 78 tons of 1", 2" and 3" steel balls. Last used at a phosphate processing facility and in good condition.

Used 8' x 10' Epworth 200 HP jacketed steel ball mill, approximately 8' diameter x 10' long, jacketed chamber, gear and pinion driven with approximately 200 motor drive, on stands, Serial# K-0845.

Used 175HP Hosokawa Alpine Super Orion Continuous Ball mill. Model 195/495 CLKE. Alumina Oxide lined. 195 cm (76")inner diameter x 495 cm (194") long drum, periphery dry discharge with adjustable discharge openings, enclosed discharge housing, direct driven thru gearbox. 175HP 460 volt motor with VFD motor controller. Serial# C1198474. Built 2012.

Used 6' x 8' Paul Abbe jacketed 100 HP steel ball mill, approximately 6' diameter x 8' long, jacketed chamber, gear and pinion driven with approximately 100 motor drive, on stands.

Unused 5' diameter X 6' long Steel Lined Ball Mill, manufactured by Patterson Industries, Type D, non-jacketed, with AR400 steel liners. Includes 30 HP, 3 phase, 60 Hz, 230-460 V, 1725 RPM motor. Mill drive is integrally coupled to horizontal parallel shafted helical gear reducer. Continuous type, with product feeding through spiral inlet trunnion and exiting through the discharge end trunnion. Features cylinder manway access door for cleaning. Internal volume measures approximately 839 USG (112 CF). Mill shell is lined with (24) 1/4" thick liner plates, each head lined with (8) 3/8" thick pie-shaped liner plates. Mounted on stand with approximately 66" clearance between the mill cylinder and floor. Mills were intended for use in glass particle size reduction but were never installed. Manufactured in 2019, units are still in factory plastic wrap and in new condition. (Qty - 2 available)

Used 5 ft. dia. x 6 ft. (Approx 120 Cu.Ft) Patterson Pebble Mill. Alumina brick lining. On stand with 20 HP motor and gear reduced drive with brake. Bull gear and pinion. Babbit bearings. Door is polyurethane and has a drain with plug.

Used 4' x 5' (345 Gallon Total/210 Gallon Working) Ball Mill. Mfg Steveco. Steel Lining. Jacketed. 20 HP (460V/60Hz/3ph) Gear Reduced heavy duty drive on high stands. Solid door and discharge door.

Used Paul O. Abbe One Piece Ceramic Ball Mill, Model JM-300. Non-Jacketed chamber approximate 24.8" diameter x 39.5" long. Vessel volume 300 liter (79 gallons). Approximate 5" charge and discharge port with cover. Driven by a 3 HP, 3/60/208-230/460 volt 1760 rpm motor with a shaft mounted Sumitomo Model 203E-25 reducer. Approximate 32 rpm drum speed. Includes a control panel with an ABB drive. Mounted on a common carbon steel frame legs. Serial # 0830032JM. Built 2008.

Used 28 Gallon Paul O. Abbe Ceramic Jar / Ball Mill. Approximate 3.7 Cubic Feet. Approximate 20" diameter x 20" straight side. Includes motor and cage. Mounted on a carbon steel frame with safety cage.

Used 30 gallon Paul O. Abbe Jar Mill. Porcelain jar 21" diameter x 18" straight side. Driven by 1hp, 1/60/115/230 volt, 1740 rpm motor thru a reducer, ratio 9.3 to 1. Inlet & outlet with cover and clamp. Mounted on carbon steel legs with a discharge housing. Serial#84876

Used 25 Gallon Norton Chemical Process Products Jar Mill. Porcelain jar 20" diameter x 20" straight side. Driven by 1hp, 3/60/230/460 volt, 1730 rpm motor thru a reducer, no ratio. Inlet & outlet with cover and clamp. Mounted on carbon steel legs with a discharge housing. Serial# AV-83104.

Used 35.30 Gallon Paul O. Abbe Jar Mill. Model 5A Porcelain jar 22" diameter x 20" straight side. Driven by 1hp, 3/60/230/460 volt, 1745 rpm motor thru a reducer, ratio 25 to 1. Inlet & outlet with cover and clamp. Mounted on carbon steel legs with a discharge housing. Serial#A41563.

Phoenix Equipment is a global supplier of used ball mills. We have new, used and reconditioned ball mills from leading manufacturers, including: Paul O. Abbe Retsch Epworth Patterson Netzsch Newell Dunford Marcy Denver FL Smidth Nordberg Allis Chalmers Metso Hardinge Kurimoto Iron Works Kobe-Allis Chalmers Stevenson Fuller-Traylor Steveco Western Machinery Marion Machine Makrum and more. Ball mills are used in a wide-range of industrial applications: cement processing, paint dyes and pigmentation processing, coal and ore processing, chemical processing and pyrotechnics, and many others. Ball milling has several key advantages over other systems: cost of the grinding medium and installation is generally low works for batch or continuous operation (as well as closed-circuit grinding) suitable for a wide range of materials simple design ensures less repairs Whether you are in the market for a used ball mill for your business or you have a pre-owned ball mill youd like to sell, USA-based Phoenix Equipment can help. Contact us today to learn more about what Phoenix can do for you. Related equipment: Agitators, Screen/Separators, Kilns and Calciners, Scales and Extruders. Fill out our quick and easy quote form for more information about our Ball Mills inventory.

Ball mills are used in a wide-range of industrial applications: cement processing, paint dyes and pigmentation processing, coal and ore processing, chemical processing and pyrotechnics, and many others.

Whether you are in the market for a used ball mill for your business or you have a pre-owned ball mill youd like to sell, USA-based Phoenix Equipment can help. Contact us today to learn more about what Phoenix can do for you.

Phoenix Equipment buys and sells used chemical process equipment and plants for relocation. Our industry focus includes process plants and machinery in the chemical, petrochemical, fertilizer, refining, gas processing, power generation, pharmaceutical and food manufacturing industries. We have extensive experience acquiring processing plants and process lines that require the execution of complex dismantlement, demolition and decommissioning projects. Based in Red Bank, New Jersey, USA, we have team members located in China, India, Germany and relationships throughout the world.

Why Use Phoenix for Your Plant Dismantling & Plant Relocation Needs A Common Plant Liquidation Scenario Your company has made the tough decision to close a plant. This plant was running for years, and the company paid a lot to have it built, paid everyones salaries, and maintained or even modernized all of the production assets over the plants life but the plant needs to be sold off for one reason or another. Your company has called upon you to recover as much dollar as you can to help keep the organization alive, and better yet, healthy, in what is a constant battle in the marketplace. Youve either: Have spent months, maybe even years trying to find a buyer that would operate the plant in place, without any success, while the plants assets lose value every passing day. Or, you cant sell it to another company, as you are one of the few suppliers of the product the plant makes, and you dont want to create a competitor, or improve a competitors position. Or, the plant is on leased propert

Hydrogenation: Major Applications Hydrogenation is a billion-dollar industry. Hydrogenating means to add hydrogen to something. According to Haldor Topsoe, hydrogenation comprises 48% of total hydrogen consumption, 44% of which is for hydrocracking and hydrotreating in refineries , and 4% for hydrogenation of unsaturated hydrocarbons (including hardening of edible oil) and of aromatics, hydrogenation of aldehydes and ketones (for instance oxo-products), and hydrogenation of nitrobezene (for manufacture of aniline). Hydrocracking & Hydrotreating Industrially, hydrotreating and hydrocracking are performed in down flow trickle bed reactors, where the gas and the liquid feed are sent concurrently through a fixed bed plug flow reactor. Although the flow pattern in the reactor can be reasonably approximated, the observed kinetics in such a trickle bed reactor are quite often affected by minor unplanned oscillations in the flow. How the gas and liquid collide and mix together affects the end prod

Thermoplastics A Focus on Polyethylene & Polypropylene Thermoplastics are a class of polymers, that with the application of heat, can be softened and melted, and can be processed either in the heat-softened state (e.g. by thermoforming) or in the liquid state (e.g. by extrusion and injection molding). Over 70% of the plastics used in the world are thermoplastics, and the two most commonly used thermoplastics are both olefins, compound made up of hydrogen and carbon that contains one or more pairs of carbon atoms linked by a double bond. These two olefins are polyethylene and polypropylene. Polyethylene Polyethylene is a tough, light, flexible synthetic resin made by polymerizing ethylene, chiefly used for plastic bags, food containers, and other packaging. It may be of low density or high density depending upon the process used in its manufacturing. It is resistant to moisture and most of the chemicals. It can be heat sealed and is flexible at room temperature (and low temperature), and in additional to its material properties,

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.