Mechanical Operations
In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the

Filtration time only
Square of the viscosity
Square root of the velocity
Washing time only

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Mechanical Operations
Work index is defined as the

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
Energy needed to crush one tonne of feed to 200 microns

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