Mechanical Operations
Work index is defined as the

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

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