Mechanical Operations
Screw conveyors are

Suitable for highly abrasive materials
All of these
Suitable for sticky materials
Run at very high rpm

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Mechanical Operations
Rod mills employed for grinding

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

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