1/1/2024 0 Comments Transloader spoutsStirring mills may be horizontal or vertical and motion is imparted to the charge by an internal stirring element. Tumbling mills generally operate in a horizontal orientation, and the shell of the mill rotates to impart motion to the contents or charge. Mills may be classified into two broad types based on how they operate: tumbling mills and stirring mills. Milling, often called grinding, is a process by which granular minerals are reduced in size by compression, abrasion, and impaction. In contrast, hammermills operate with higher speed components and can act as centrifugal fans. The mechanical action of crushers can generate air movement i.e., jaw crushers can have a bellows-type effect, and cone or gyratory crushers can act as fans, although neither of these classes of crushers operate at high speeds. Compression involves a slower energy transfer than impaction, and compressive crushers produce somewhat less dust than impact crushers. Hammermills, impact breakers, and roll crushers operate primarily by impaction depending upon rotor speed at which the breaking force is transmitted from the crusher to the material. Cone or gyratory crushers may be used as primary or secondary crushers and also operate through compression. The most common primary crusher type is the jaw crusher which operates by compressing the feed material between a fixed and moving plate or jaw. Secondary selection considerations include the composition, hardness, and abrasiveness of the feed material(s). Selection of crushers is based primarily on material size-reduction and throughput requirements. Size reduction processes will always contain at least one crushing circuit, and many times will have multiple crushers, often of different types.
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