Mechanical Operations
Rod mills employed for grinding

Is useful for handling sticky materials
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

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Mechanical Operations
Work index is defined as the

Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen
Energy needed to crush one tonne of feed to 200 microns
Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen
Energy needed to crush one ton of feed to 100 microns

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