Mechanical Operations
A filter press is

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

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Mechanical Operations
Rod mills employed for grinding

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

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