Filtration industrial applications, according to different filtering power can be divided into four types. 1.Gravity filtration. Filter belongs to the class of deep bed filtration (ie, thick filter layer), which is characterized by deposition of solid particles occurs within a thick layer of granular media bed. Suspension particle diameter smaller than the diameter of pores bed, when the particles with the fluid passing through the tortuous channels in the bed inside, and it adheres to the filter medium. This filter is suitable for very small particles in suspension and little content occasions, such as a water factory quartz sand filter media to achieve water purification. 2. By vacuum filtration. The use of a vacuum pump filter medium on both sides of a certain pressure difference, the driving force in this action, the liquid suspension through the filter cloth, while the solid particles are deposited cake layer on the upstream side of the filter cloth. This method is generally suitable for the treatment of solid and liquid-solid small particles finer suspension. 3. Pressure filtration. The use of high-pressure air 785 kPa (8 kg / cm 2) or high-pressure water 883 ~ 1569 kPa (9 to 166 kg / cm 2) mounted on the filter chamber filled with one or both sides of the diaphragm by means of a diaphragm expansion uniform press cake, filter cake can be obtained an aqueous low. Generally suitable for processing fine-grained sticky and difficult to filter material. In recent years, and the development of pressure – combined vacuum filtration. 4. Centrifugal filtration. The use of centrifugal force, the suspension liquid was thrown, and the surface of the particles are trapped in the filter cloth, centrifugal force field gravity field may provide a stronger driving force for filtration, separation of high-speed good effect. Adapted to process the slurry containing small solid particles.
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