The plate and frame filter press (plate and frame filter press) consists of a filter plate and a filter frame which are alternately arranged to form a set of filter chambers. The surface of the filter plate has a groove, and a protruding portion thereof supports the filter cloth. There are through holes in the corners of the filter frame and the filter plate, which form a complete passage after assembly, and can pass into the suspension, wash water and lead the filtrate. There are handles on both sides of the plate and frame supported on the beam, and the plate and frame are pressed by the pressing device. The filter cloth between the plates and the frames functions as a gasket.
The suspension hydraulic pressure is introduced into the filter chamber by the feed pump to form a filter residue on the filter cloth until it fills the filter chamber. The filtrate passes through the filter cloth and flows along the groove of the filter plate to the corner channel of the plate frame to be discharged. After the filtration is completed, the filter residue can be washed with water. 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, frame, and start the next work cycle.