Mechanical Operations
Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called

Clarification
Froth floatation
Classification
Thickening

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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
Is useful for handling sticky materials
Employ a steel shell having L/D ratio of 1.5 to 3.0

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