Mechanical Operations
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?

Calcium carbonate
Copper sulphate
Cresylic acid
Sodium carbonate

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Mechanical Operations
Rod mills employed for grinding

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

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