Mechanical Operations
A filter press is

Not suitable, if the liquid is the main product
A batch filter
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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Mechanical Operations
Rod mills employed for grinding

Employ steel rods of 2-12 cms diameter extending over full length of the mill
All of these
Employ a steel shell having L/D ratio of 1.5 to 3.0
Is useful for handling sticky materials

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