Mechanical Operations
Rod mills employed for grinding

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

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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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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

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

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