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Crushers and mills reduce solid products to a desired particle or aggregate size in dry or slurry forms. In addition, mills are used for mixing and dispersing solids within liquids. Selection criteria for crushers and mills should be based on feed size, material, and hardness. Processing equipment types include ball or media mills, cone and gyratory crushers, disk attrition mills, colloid and roll mills, screen mills and granulators, pin mills, impact mills and breakers, hammer and cage mills, jaw crushers, jet and fluid energy mills, roll crushers, disc mills, and vertical rollers and dry pans. 

Ball and media mills, cone and gyratory crushers, and disk attrition mills are three types of crushers and mills. Ball and media mills use a grinding media (balls, rods, etc.) to reduce materials into particles. Water, liquids, and other additives assist the grinding process by reducing friction, deflocculating, and cooling. Media mills are also used to distribute a powder into a liquid (e.g., a pigment in a paint base). Motion is transmitted by tumbling, rotating, stirring rods, or vibration. Cone and gyratory crushers consist of a cone-shape bowl with a gyrating head. Feed is crushed between the cone and the head. Disk attrition mills and double-disk mills are modern versions of the ancient buhrstone mill; however, the stones are replaced with opposing plates that may be grooved, serrated, or spiked.

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Other Topics You Might Be Interested In
Ball Mills and Media Mills
Ball mills and media mills are milling equipment that reduces particle size by tumbling a feed with grinding media such as balls, rods or other shapes. Ball mills are typically wet, batch units. Water... (Read More)
Colloid, Dispersion and Roller Mills
Dispersion, colloid and roller mills are used to reduce solid products to a desired particle or aggregate size in dry or slurry forms. Colloid mills use discs or rotors that spin at very high speeds... (Read More)
Vertical Roller Mills
Vertical roller mills use a vertically orientated crushing wheel or muller that revolves around a solid or perforated pan, or screen. Alternately, the pan can rotate or both the rollers and pan or... (Read More)

Engineering Web: Crushers and Mills
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