Filter is a device for separation of solid particles and liquid via porous media (filter cloth, filter plate, etc) by using pressure difference.

Definition: a mechanical device to make liquid dialyzed out by using special filter media.
Function: extract the solids form the mixed liquor and realize the function of solid-liquid separation.
Classifications:
A. Classified by filter type: Chamber pressure filter and belt pressure filter, membrane pressure filter and plate and frame pressure filter
B. Classified by structure: Bridge pressure filter and belt pressure filter
Science involved: physical properties of solids and fluids.
Subject: coal science & technology (first-level discipline), mining mechanical engineering (second-level discipline); coal preparation machine (third-level discipline)
History: the first set of pressure filter equipment appeared at the beginning of the 18th century for production of chemical industry.

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