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Diaphragm Filter Press Working Principle

Views: 0     Author: Site Editor     Publish Time: 2020-04-03      Origin: Site

The main difference between a diaphragm filter press and an ordinary chamber filter is that an elastic membrane diaphragm plate is installed between the filter plate and the filter cloth. During the operation, when the feeding is completed, the high-pressure fluid medium can be injected between the filter plate and the diaphragm. At this time, the entire diaphragm will swell and press the filter cake, thereby achieving further dehydration of the filter cake, that is, squeezing and filtering.

The first is positive pressure dehydration, also known as slurry dewatering, that is, a certain number of filter plates are closely aligned in a row under the action of strong mechanical force. A filter chamber is formed between the filter plate surface and the filter plate surface. The solid part of the filter material that is sent to the filter chamber under positive pressure is trapped by the filter medium (such as filter cloth) to form a filter cake, and the liquid part passes through the filter medium and exits the filter chamber, so as to achieve the purpose of solid-liquid separation. With the increase of positive pressure, solid-liquid separation becomes more thorough, but from the perspective of energy and cost, excessively high positive pressure is not cost-effective.

After the pulp is dewatered, a filter press equipped with a rubber squeeze film is used. The compressed medium (such as gas and water) enters the back of the squeeze film to push the squeeze film to further dewater the squeeze filter cake, which is called squeeze dehydration. After the pulp is dewatered or squeezed, the compressed air enters one side of the filter cake and penetrates the filter cake. It carries liquid moisture from the other side of the filter cake through the filter cloth and exits the filter room. If filter cloth is applied to both sides of the filter chamber, the liquid part can be evenly penetrated through the filter cloth on both sides of the filter chamber and discharged from the filter chamber, so that the filter chamber is dehydrated on both sides.

After the dehydration is completed, the mechanical pressing force of the filter plate is released, and the single piece gradually pulls open the filter plate, and the filter room is opened to carry out cake unloading as a main work cycle. Depending on the nature of the material being filtered, the filter press can be equipped with feed dewatering, squeeze dewatering, wind-blown dewatering, or single or double-sided dewatering, the purpose of which is to minimize the water content of the filter cake.


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