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

Ball mill
Hammer mill
Buhrstone mill
Crushing rolls

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Mechanical Operations
A filter press is

A batch filter
Not suitable, if the liquid is the main product
Having prohibitively high maintenance cost
Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure

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