Mechanical Operations
For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a

Buhrstone mill
Ball mill
Crushing rolls
Hammer mill

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Mechanical Operations
Rittinger's crushing law states that

Work required in crushing is proportional to the new surface created
Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product
For a given machine and feed, crushing efficiency is dependent on the size of the feed & product
Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product

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