1, The filter selection factors: Temperature and viscosity of the material was filtered state, physical and chemical characteristics, the processing amount per unit time, the moisture content of the filter cake, the filtrate solids content of the filter cake washed with degree and so on; type size (filter area and filter chamber volume) choices Key selection analogy and laboratory tests to determine. 2, Van filter frame filter press: Plate and frame filter press is a kind of pressure filtration equipment filter intermittent operation, it is made pressing portion, thrust plate, pressing plate, beams, consisting of a frame, all filter plates and filter box stacked alternately mounted on two equal support beam, the corresponding parts of all filter plates and filter box has liquid flow channel for introducing a liquid suspension or discharge, all sides of the filter plate and frame filter have the same shape as the sealing surface between the cloth sandwiched between the plate and the frame sealing surface, become sealed filter plates and gaskets in the frame-shaped sealing surface of the supporting cloth filter surface covered with grooves, trenches and all filtrate discharge communication channel, a filter made up of many parallel filter chamber formed on both sides of each filter chamber are prevented suspension of solid phase particles allow penetration of filtrate through the filter cloth layer, total filtration of these Plates the area representing all filter production capacity. Plate and frame filter press Is composed of a filter plate and a filter frame composition, can withstand lower filtration pressure (typically less than 0.6Mpa) for each device based on the size of the area, the number of different frame, frame filter press is generally used for materials containing particles like object less filter material, commonly used in fine filtration products can be added at the back of the paper filter cloth filter. Van filter Monolithic plate and frame filter plate filter plate than the thick, that is, by the same Chamber Filter Plates made two coincide, when pressed between two filter plate to form a filter chamber for storage of filter cloth granular objects isolated, feed hole in the center of the filter plate, generally used for more granular objects, materials, such as waste water treatment, mineral processing, coal washing and other industries, van filter characteristics of each filter chamber is not caused by bias so plates should not be damaged, filtering speed, convenient dumping slag, pressure filtration, the filter cake containing a low amount of fluid that can withstand the pressure filter up to 3.0Mpa, easy to implement automatic drawing board discharge, a broader range, It can be manufactured biggest filter press. Plate and frame filter press and vans can achieve free flow and undercurrent two kinds of press cake washing method can be divided into: washable and non-washable. Washable lotion is said to further wash after wash replacement and filter cake between the diffusion process to filter out unwanted waste products and cake washed cake method contained distinct flow washable , the undercurrent can be washed and washed in line type (also known as two-way cross-washing type). If the selection is not washable, you can only filter can not be washed.