Mechanical Operations
__________ is used for producing a thick suspension from a thin slurry.

Cartridge filter
Rotary drum vacuum filter
Pressure filter thickener
Plate and frame filter press

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Mechanical Operations
Rod mills employed for grinding

Is useful for handling sticky materials
All of these
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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