Views: 2 Author: Site Editor Publish Time: 2019-01-09 Origin: Site
The diaphragm filter press used in the industry differs from the conventional filter press in that a filter press with a layer of elastic film is interposed between the filter plate and the filter cloth. During use, high-pressure fluid or gaseous medium can be injected into the elastic membrane when the feed is finished. At this time, the entire membrane will slowly swell and press the filter cake twice, thereby further dewatering the filter cake. It is called press filtration. Also known as diaphragm filter press.
The diaphragm filter press is firstly a normal ordinary filter, also known as slurry dewatering, that is, a certain number of filter plates are closely arranged in a row under the action of strong mechanical force, and a filter is formed between the filter plate surface and the filter plate surface. In the chamber, the filtered material is sent to the filter chamber under a strong positive pressure, and the filter material entering the filter chamber is intercepted by a filter medium (such as a filter cloth) to form a filter cake, and the liquid portion is discharged through the filter medium. The filter chamber is used for the purpose of solid-liquid separation, and the solid-liquid separation is more complete as the positive pressure is increased. The cost of a diaphragm filter press is also more expensive than a conventional filter press.
Basically, after the slurry is dewatered in the industrial process of the membrane filter press, a filter press equipped with a rubber extruded film is used, and a compressed medium (such as gas or water) enters the back surface of the extruded film to push the extruded film to press the filter cake. Further dehydration, called extrusion dehydration.
When the diaphragm filter press is used for slurry dewatering or extrusion dehydration, the compressed air enters the filter chamber side and passes through the filter cake. The liquid water is carried out from the other side of the filter cake through the filter cloth and discharged from the filter chamber to be dehydrated. This is called wind blowing dehydration.
If the filter cloth is applied to both sides of the filter chamber on the diaphragm filter press, the liquid portion can pass through the filter cloth on both sides of the filter chamber and exit the filter chamber, which is called double-sided dewatering of the filter chamber.
The industrial performance of the diaphragm filter press is that after the dewatering is completed, the mechanical pressing force of the filter plate is released, and the filter plate is gradually opened by a single piece, and the filter chamber is opened to perform the unloading of the cake, etc., as a main working cycle. Depending on the nature of the filter material, the filter press can be separately set into slurry dewatering, extrusion dewatering, wind blowing dehydration or single and double side dewatering, in order to minimize the filter cake moisture. It is a long-term benefit to save operating costs from transportation and handling.