Mechanical Operations
In case of a hammer crusher, the

Feed may be highly abrasive (Moh's scale >5)
Maximum feed size may be 50 mm
Minimum product size is 3 mm
Rotor shaft carrying hammers can be vertical or horizontal

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Mechanical Operations
Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is

Separated from the cake by dissolving solids or by burning it off
All of these
Added to the feed slurry
Precoated on the filter medium prior to filtration

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