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 1. Plate-and-frame filter press (plate-and-frame filter press) consists of filter plates and filter frames arranged alternately to form a group of filter chambers. There are grooves on the surface of the filter plate, and the protruding parts are used to support the filter cloth. The corners of the filter frame and the filter plate are provided with through holes, which form a complete channel after assembly, through which suspension, washing water and filtrate can be introduced. Handles on both sides of the plate and frame are supported on the beam, and the plate and frame are pressed by the pressing device. The filter cloth between the plate and the frame acts as a sealing gasket. The suspending fluid is pumped into the filter chamber by the feed pump to form filter residue on the filter cloth until the filter chamber is filled. The filtrate passes through the filter cloth and flows along the groove of the filter plate to the corner channel of the plate frame, and is discharged centrally. After filtration, clean water can be introduced to wash the filter residue. After washing, compressed air is sometimes introduced to remove the remaining washing liquid. Then open the filter press to remove the filter residue, clean the filter cloth, re-press the plate and frame, and start the next working cycle.