Diaphragm filter press is a special type of filter press used for solid-liquid separation and dewatering treatment. Compared with the traditional chamber filter press, the diaphragm filter press adds an adjustable diaphragm in the filter press process to further compress the filter cake and improve the dewatering efficiency.

The core part of the Diaphragm filter press is composed of the filter plate, the filter frame and the diaphragm. The space between the filter plate and the filter frame is separated into several independent chambers by the diaphragm, and each chamber forms a filtration chamber around the filter plate and filter cloth. In the filter press process, the material slurry enters the filter chamber through the feed system and is subsequently filtered rapidly by applying a certain amount of pressure to the solid material to form a filter cake. Meanwhile, the diaphragm is usually controlled using pneumatic or hydraulic devices, which can adjust the degree of deformation of the diaphragm and further compress the filter cake.