Mechanical Operations
Tank filter (e.g., Nutsch filter) is

A continuous filter
A high pressure filter
A leaf filter
Used for small scale filtration work

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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 ton of feed to 100 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 tonne of feed to 200 microns

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