A negative pressure is formed at the outlet of the filtrate as a driving force for filtration. The absolute pressure of the industrial vacuum filter operating vacuum is (2.5 to 8.0) x 105 Pa. The temperature of the suspension during filtration should be lower than the vaporization temperature of the filtrate under operating vacuum. This filter is divided into two types: intermittent operation and continuous operation. Intermittently operated vacuum filters filter various concentrations of suspension. The vacuum filter is filled with a suspension in the outer casing of the container. The filter leaves on both sides of the filter cloth are immersed in the suspension, and the inner chamber of the filter leaves is connected to the vacuum system. After the filtrate is sucked out, it is taken out by the conduit, and the filter residue accumulated on the surface of the filter leaf is removed after shutdown. A continuously operated vacuum filter is suitable for filtering thick suspensions containing more solid particles. The drum vacuum filter, inner filter drum vacuum filter, disc vacuum filter and tipping vacuum filter work in a similar manner. The entire filter surface is divided into a plurality of spaced filter chambers, and each of the rotating filter chambers is sequentially connected to each fixed tube through a distribution valve to suck out the filtrate, the washing liquid in the filtration chamber, or to supply compressed air. The entire process of the filtering operation is completed by one revolution of each filter chamber, and the operation of the plurality of filter chambers is connected to form a continuous filtration. The belt vacuum filter has a structure similar to that of a belt conveyor and has a continuous filter belt for easy filtration of the suspension. The belt vacuum filter, the inner filter surface drum vacuum filter and the tipping bucket vacuum filter are all fed on the upper part of the filter medium (filter cloth), and are especially suitable for the suspension with high solid particle density and fast sedimentation.