mineral air classifier

types of classifiers in mineral processing

types of classifiers in mineral processing

In mineral processing, the Akins AKA spiral or screw Classifier has been successfully used for so many years that most mill operators are familiar with its principle and operation. This classifier embodies the simplest design, smallest number of wearing parts, and an absence of surge in the overflow. It separates coarse and fine solids, carried in liquids, with a high degree of accuracy and with lowest possible power and maintenance costs. Additional information on Akins Classifiers will be sent upon request.

If the pulp (solids and liquid) contains more than 5% of solids larger than 48 mesh, the type 40 Allen Sand Cone is almost always used, where as if the solids contain less than 5% coarser than 48 mesh it is generally advisable to install the type 50 Slime Cone.

The feed enters the cone through an inner truncated cone, settled solids gradually building up in the cone to a point restricting the out-flow of the inner truncated cone. This causes the water level in the truncated cone to rise lifting a float which operates a series of levers to operate a ball valve to open a spigot in the bottom of the cone which discharges the settled material. This arrangement maintains an even depth of sand regardless of increase or decrease in the feed rate. If a foreign object should obstruct the opening retarding the flow the valve opens wider, thus allowing the passage of the obstruction.

The operation of the Allen Slime Cone follows the same general principle as described above except the float is located near the bottom of the cone and is operated by the buoyancy of the settled slime. The float operates a ball valve and spigot same as for the sand cone.

CONE Classifiers are built in two types, one operating on the density of the pulp in the cone, and the other on the hydraulic or mechanical movement of the pulp. The Dewatering Cone is of the former type. The weight of the pulp in the cone actuates a lever with an adjusting weight, automatically controlling the discharge valve. This method gives a constant density discharge. The unit can be used as either a dewaterer or classifier, requires no power, and is entirely automatic.

The body of the separator can be conical or pyramidal in shape, to suit best the physical requirements of the location. The classifier can be used to advantage in dewatering and controlling feed to a regrind ball or rod mill, or material from tables, jigs, or flotation.

CLASSIFIERS having a helical (often improperly called spiral) flight for removing settled coarse material have long been in successful use and most mill operators are familiar with their operation. The Cross-Flow Classifier is of this general type but has many improvements which result in improved metallurgical efficiency, longer life and less repair. Among these improvements may be mentioned:

An auxiliary weir is provided at the end of the classifier. Both the main and auxiliary weirs are provided with weir blocks by which the depth of the pulp and pool area may be adjusted, thus controlling the size of separation.

The Cross-Flow Classifier is ruggedly constructed and the tank is thoroughly reinforced. Bearings are Jarge and all gears are enclosed. The 6, 9, and 12 sizes have replaceable hard cast iron flight sections on a square shaft. The 18, 24, and 30 have replaceable hard cast iron flight sections. The 36, 42, 48, 54, and 60 sizes have replaceable steel flights and replaceable hard iron wearing shoes. Sizes 30 and larger are provided with lifting device by which the lower end of the flight may be raised and the conveyor operated while it is slowly lowered, thus gradually removing the bed of solids which settles during a shutdown.

Hydraulic Classifier is designed for use in gravity concentration mills for preparing a classified feed for table concentration. The classifier compartments are provided with glass sides so that the conditions existing in each chamber can readily be observed. Only enough water is necessary to keep the solids in full teeter. As the sands accumulate in the classifier pockets the effective density of sand-water mixture increases and thumbscrews onthe valve rod assemblies may be adjusted to discharge sand fromeach compartment as required. The finer the sand the less water is required. When the pressure regulating valves and the product valves are set, no further adjustment is necessary.

The Hydraulic Classifier is made in 2, 4, 6, and 8 compartments with two sizes of compartments, namely 4x 4 and 8x 8. The standard units are of steel construction. Capacity depends on specific gravity of the material and range of size taken from each compartment. The 4x 4 has a capacity from 5 to 10 tons per compartment in 24 hours. The 8x 8 has a capacity from 20 to 50 tons per compartment in 24 hours. Additional data gladly furnished upon request.

TheHydroclassifieris designed to make a separation according to size in the range from 100 mesh to that of colloidal particles. It is particularly suited to the removal of slimes prior to further treatment by flotation, cyanidation, or chemical processes. The separation in this fine size range requires a large quiet, pool area, such as isprovided by the Hydroclassifier, combined withaccurate control over the removal and washing of thesettled material for maximum classification efficiency.

In the Hydroclassifier the feed enters a feed well in the center of a large settling tank and flows without agitation into the pool. The slimes and fine material move radially to the overflow weir at the rim of the tank and overflow into the overflow launder. As the slimes move to the weir, the coarse particles settle on the sloping tank bottom, where slowly moving spiral rakes continuously move these settled solids to a central discharge cone. In the discharge cone water is added below a perforated plate while the settled solids are rabbled above the plate, thoroughly washing out slimes and fines from the coarse material, as it works through the openings in the plate. The coarse material is usually removed in the form of a sludge by means of a Adjustable Stroke Diaphragm Pump.

The tank is steel, thoroughly reinforced, and supported on steel columns, thoroughly braced. The mechanism driving the rakes is an alloy steel gear and bronze worm, supported on anti-friction bearings enclosed and running in oil. The vertical shaft and rakes may be raised or lowered while the mechanism is in operation. Extra heavy construction is provided throughout, resulting in long life and a minimum of repair. Additional data gladly furnished upon request.

In addition to these standard machines we can furnish larger sizes where mechanism is placed in customers concrete tanks. Mechanism sizes 22 to 40 can be furnished for concrete tanks. These sizes can be furnished in Bolted Steel Tanks. Capacity range depending on mesh separation, specific gravity and per cent solids in products. Horsepower depends on the amount of solids settling and specific gravity.

The Rake Classifier is designed for either open or closed circuit operation. It is made in two types, type C for light duty and type D for heavy duty. The mechanism and tank of both units are of sturdiest construction to meet the need for 24 hour a day service. Both type C and type D Rake Classifiers have a tank made of heavy steel plate with the seams double electric welded both inside and out. Tanks are arranged so that feed may enter from either side. Rakes are made either of heavy steel angles welded to channel supports which are carried by the actuating mechanism or channel irons split lengthwise and welded to supports, whichever type of duty the classifier will be expected to perform. Raking movement is accomplished by a cam and roller drive. Cams are mounted on an oversize shaft and driven by a semi-steel cast tooth gear and pinion on the light duty unit or heavy molychrome steel cams operated by machine cut gears are used on the heavy duty unit. Mechanism supports are of the strongest possible construction and have a large safety factor to withstand severe load conditions. Also, the babbitted pillow block drive bearings on the light duty unit and the bronze bushed drive bearings on the heavy duty unit are of ample size to handle most any overload condition.

A rake lifting device, utilizing worm gears, a hand crank, and steel cables, is provided on both units and this rake lifting device is so designed that one man can quickly and easily raise or lower the rake. Classifiers can be furnished either belt or motor driven. On the belt driven type a right angle drive can be supplied if desired. The standard motor drive is V to flat with 3-phase, 60 and 50 cycle, 220, 440 or 550 volt motor.

The standard length of C type simplex classifier is 148, with widths of 16, 20, 23, 30. Type C duplex standard lengths are 120, 148, 164 and 180, with widths of 40, 46, 50 and 60. Model D simplex has tank lengths of 184, 20,0, 218, 234, 250, or 268, with width of 30 and 40. Heavy duty model D duplex comes with tank lengths the same as model D simplex, and widths of 50, 60, 70 and 80.

The Rotary High Weir Classifier is designed to give best classification of fine and coarse material. The horsepower is low and maintenance is reduced to a minimum. The classifier is made with either a high or low weir, the highweir with its larger pool areabeing used where a fine separation is necessary. Rotary High Weir Classifier is built with replaceable wearing flights, steel tank mounted on base, and belt or gear-motor drive. Standard drive is a single bevel gear, although spur gear and double reduction drive units can be furnished.

The two conveyor shaft bearings are mounted outside ofthe tank away from pulp and splash. The conveyor shaftis effectively sealed at the slime overflow end of the tankby means of a specially designed stuffing box which contains a distributing ring in addition to the conventional packing rings. Admission of water to the interior of the stuffing box prevents any dirt from entering. This classifier can also be made of corrosion-resisting material so as to handle successfully products such as sulphuric acid.

micron separator air classifier | classification & separation | applications | hosokawa micron powder systems

micron separator air classifier | classification & separation | applications | hosokawa micron powder systems

The Micron Separator Air Classifier is a mechanical centrifugal air classifier, using flow through technology, providing precise, efficient, and reliable separations of materials. The Micron Separator is unique in the field of fine powder classification as it can be retrofitted to many popular grinders, such as the Mikro Pulverizer Hammer & Screen Mill.

The machinery is able to classify particles by balancing the centrifugal force of the rotor and the centripetal force of the air. Material to be separated is pulled through by the fan into the inlet duct and up to the rotor, where the two opposing forces classify it. Finer particles are more susceptible to centripetal forces whereas coarse particles are more prone to centrifugal force. These forces flow coarse materials down the inside wall of the machine, emptying out the materials in the coarse particle discharge, while finer particles travel through the air current into the rotor and then discharged through the upper outlet duct. There are 12 motor options to suit all classification needs. The Micron Separator Air Classifier are perfect for applications in the food, chemical, and cosmetic industries.

Due to heavy market demands for multipurpose technology, the Micron Separator is unsurpassed with its broad applications range, boosted productivity when paired with a grinding unit, and precise classifications of even the finest particles.

The machinery is able to classify particles by balancing the centrifugal force of the rotor and the centripetal force of the air. Material to be separated is pulled through by the fan into the inlet duct and up to the rotor, where the two opposing forces classify it. Finer particles are more susceptible to centripetal forces whereas coarse particles are more prone to centrifugal force. These forces flow coarse materials down the inside wall of the machine, emptying out the materials in the coarse particle discharge, while finer particles travel through the air current into the rotor and then discharged through the upper outlet duct. There are 12 motor options to suit all classification needs. The Micron Separator Air Classifier are perfect for applications in the food, chemical, and cosmetic industries.

Due to heavy market demands for multipurpose technology, the Micron Separator is unsurpassed with its broad applications range, boosted productivity when paired with a grinding unit, and precise classifications of even the finest particles.

air classifier for calcium carbonate - top daswell ball mill and classifier

air classifier for calcium carbonate - top daswell ball mill and classifier

Air classifier is an industrial machine to separate materials by a combination of size, shape and density. And of course air classifier can be used to separate different materials. Usually, an air classifier can work alone, or work with grinding mills. Air classifier for calcium carbonate is a micron separator to separate calcium carbonate powder ground from calcium carbonate ball mills or other mills. In the calcium carbonate plant with ball mill and classifier, one or more calcium carbonate classifiers work with the ball mill to get the fine and ultra fine ground calcium carbonate powder. Daswell machinery offers quality classifiers for calcium carbonate with great durability, reliability and optimum performance. Working with calcium carbonate ball mills, Daswell calcium carbonate classifier can produce ground calcium carbonate powder with particle size range 2.0-25m.

Henan Daswell machinery company is a leader manufacturer of mineral processing equipment. In fact, Daswell offers end-to-end turnkey solutions for mineral processing plants, such as calcium carbonate plant, quicklime plant, hydrated lime process plant and silica plant. We offer designing and planning services for your mineral production lines in line with your needs. And we also provide complete set of equipment for the mineral processing plants. Air classifier is core equipment for calcium carbonate plant with ball mill. Daswell calcium carbonate air classifiers for sale come with several designs according to their internal designs, cut points and production output. Each of these Daswell air classifier for calcium carbonate is of robust design to be durable, and reliable. And according to the required sizes of ground calcium carbonate powder, there can be one or more air classifiers work together in series or parallel connection. Besides, each kind of air classifier has its own optimum production range for ground calcium carbonate powder, and the range can be adjusted through adjusting the inlet air flow, the speed and amount of reverse flow.

In calcium carbonate production line with high capacity, ball mill usually works with air classifier to obtain fine and ultra fine ground calcium carbonate powder. Firstly, the required sizes of raw materials will be feed into the ball mill for grinding. And to get fine and ultra fine ground calcium carbonate powder with great consistent sizes, one or more air classifiers are needed to separate the calcium carbonate powder from the ball mill. In the classifiers, the calcium carbonate powder is further cut into fine and super fine sizes due to the high speed working of classifier wheels. With the influence of air flow, the fine and ultra fine calcium carbonate powder will be transported to product silo, while the coarser powder will be rejected and be returned to ball mill with feed materials. Ball mill and air classifier system is perfect for fine ground calcium carbonate powder processing plant. Classifier for Ground Calcium Carbonate Plant Ultra Fine Air Classifier Get Solutions Name:* Email:* Phone Message:* How does Air Classifier for Calcium Carbonate Work In calcium carbonate production line, after grinding the calcium carbonate in ball mill, the grounded calcium carbonate powder will be transported to the air classifier pneumatically through the inlet scroll. In the air classifier, the air flow becomes a rising air under the function of classifier wheel. The ascending vortex carries the fine and ultra fine calcium carbonate powder out of the classifier, and then be transferred to product silo. If more than one air classifiers work together to get superfine ground calcium carbonate powder, these fine calcium carbonate powder will be transferred to another classifier for another round of separation and classification. For the coarse material, under the influence of gravity, they will fall down the air classifier and be returned to ball mill with feed material for further grinding. How to Choose Classifier for Calcium Carbonate As stated above, Daswell provides several kinds of calcium carbonate micron separator. They are different in cut points, designs, and other factors. Despite these air classifier for calcium carbonate can be different in detailed designs, they are all durable and reliable micron separator with high quality. There is no one for all solution for choosing air classifier. But you can choose the suitable ones according to your needs. There are several factors to consider, such as the desired particle size, the grinding mill, the capacity and your budget, etc. Daswell can offer you the most suitable calcium carbonate air classifier for you in line with your specific needs. Please fill the form below to get free quotes. We will reply in 24 hours. Product Model: Your Name(required): Your Email(required): Your Tel: Your country: Your Company: Your Message(required): Other Products You May be Interested in:Calcium Carbonate PlantGround Calcium Carbonate ProcessCalcium Carbonate Grinding MillCalcium Carbonate Coating MachineWet Grinding Mill for Calcium CarbonateCalcium Carbonate Processing PlantBall Mill for Grinding Calcium CarbonateCalcium Carbonate Production Line Equipment

In calcium carbonate production line, after grinding the calcium carbonate in ball mill, the grounded calcium carbonate powder will be transported to the air classifier pneumatically through the inlet scroll. In the air classifier, the air flow becomes a rising air under the function of classifier wheel. The ascending vortex carries the fine and ultra fine calcium carbonate powder out of the classifier, and then be transferred to product silo. If more than one air classifiers work together to get superfine ground calcium carbonate powder, these fine calcium carbonate powder will be transferred to another classifier for another round of separation and classification. For the coarse material, under the influence of gravity, they will fall down the air classifier and be returned to ball mill with feed material for further grinding.

As stated above, Daswell provides several kinds of calcium carbonate micron separator. They are different in cut points, designs, and other factors. Despite these air classifier for calcium carbonate can be different in detailed designs, they are all durable and reliable micron separator with high quality. There is no one for all solution for choosing air classifier. But you can choose the suitable ones according to your needs. There are several factors to consider, such as the desired particle size, the grinding mill, the capacity and your budget, etc. Daswell can offer you the most suitable calcium carbonate air classifier for you in line with your specific needs. Please fill the form below to get free quotes. We will reply in 24 hours. Product Model: Your Name(required): Your Email(required): Your Tel: Your country: Your Company: Your Message(required):

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