About filter press operation principle, firstly, it is the positive pressure dewatering, which is also feeding and filtering. That is, a certain number of filter plates are closely arranged in a row under the strong mechanical force, and a filter chamber is formed between the filter plate surface, the raw material is fed into the filter chamber under a strong positive pressure. The solid part is intercepted by the filter medium (such as filter cloth) to form a filter cake, and the liquid portion is discharged through the filter medium to reach the purpose of liquid separation. With the increase of positive pressure, solid-liquid separation is more thorough. But considering the energy and cost, excessive pressure is not cost-effective.
After into the slurry dewatering, membrane filter equipment operation principle also has the squeeze extrusion dehydration. That is, the compressive media (such as air and water) press on the back of the extrusion film to push the extrusion film to further dehydrate the filter cake. After the into the slurry dewatering and extrusion dehydration, the compressed air enters the on one side of the filter cake, carry liquid water from the other side of the filter cloth to drain the filter chamber and dehydrate, called the core blow dehydration.
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