The vacuum filter is a device that realizes solid-liquid separation by using vacuum negative pressure as a driving force. In the structure, the filter section is arranged along the horizontal length direction, and the operations of filtering, washing, sucking, and filter cloth regeneration can be continuously performed. The rubber belt filter has the advantages of high filtration efficiency, large production capacity, good washing effect, low moisture content of the filter cake, flexible operation and low maintenance cost. Rubber belt filter can be widely used in solid-liquid separation in metallurgy, mining, chemical, paper, food, pharmaceutical, environmental protection and other fields, especially in the field of gypsum dewatering (FGD) in flue gas desulfurization. Vacuum belt filter press is a new type of filtration equipment with high degree of automation. Its products are widely used in: thermoelectric, chemical, pharmaceutical, paper, building materials, smelting, rubber, food and other fields. Vacuum belt filter press is a new type of filtration equipment with high degree of automation. Its products are widely used in: thermoelectric, chemical, pharmaceutical, paper, building materials, smelting, rubber, food and other fields. The filter is a device that utilizes a porous filter medium to trap solid particles in a mixture of liquid and solid particles to achieve solid-liquid separation. Filters are widely used in chemical, petroleum, pharmaceutical, light industry, food, mineral processing, coal and water treatment sectors. In ancient China, filtration technology was applied to production. In the 200th century BC, paper made from plant fibers was used. In 105 AD, Cai Lun improved the papermaking method. In the papermaking process, he smashed the plant fiber pulp onto a dense bamboo curtain. The water was filtered through the bamboo curtain gap, and a thin layer of wet pulp remained on the bamboo curtain. Serve paper. Most of the earliest filtration was gravity filtration, and later the filtration was used to increase the filtration speed, and vacuum filtration appeared. The drum vacuum filter invented in the early 20th century achieved continuous filtration operation. Thereafter, various types of continuous filters have appeared one after another.