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The reason why the filter can thrive and is widely used in various industries, its greatest advantage is positive pressure, high pressure dehydration, pressure difference is much larger than the traditional vacuum filter, so the cake water is low, low energy consumption With less metal loss, the filtrate is clear and transparent. As early as a decade ago, experts pointed out that the filter is the only equipment in the industry that can ensure that the water content of filter cake is less than 10%, and that it can be equipped with no flocculant.
As far as the form of the filter plate is concerned, the filter is divided into a van type and a plate type; the orientation of the filter plate is different, and there are vertical and horizontal types; the material of the filter plate varies, including plastic, rubber, cast iron, cast Steel, carbon steel, stainless steel; on the filter plate is equipped with rubber extrusion film, there are squeezed dehydration and no squeeze dewatering; on the filter plate configuration filter cloth surface number is different, there are single-sided dehydration and double-sided dehydration Points and so on.
Regardless of the filter press, the principle of operation of the filter press is first of all, positive pressure and pressure dewatering, also called dewatering. In other words, a certain number of filter plates are closely packed in a row under the action of strong mechanical force. The filter plate surface and the filter plate surface Between the formation of the filter chamber, the filter material is fed into the filter chamber under a strong positive pressure. The solid part of the filter material entering the filter chamber is trapped by the filter medium to form a filter cake, and the liquid part passes through the filter medium and exits the filter chamber, thereby achieving The purpose of solid-liquid separation is to make the solid-liquid separation more complete as the positive pressure increases, but in terms of energy and cost, an excessively high positive pressure is not worthwhile.
After the pulp is dehydrated, a filter press equipped with a rubber squeeze film is used. The compressed medium (such as air and water) enters the back of the film and pushes the film to further dehydrate the pressed cake. After dewatering or extrusion dehydration, the compressed air enters the side of the filter cake through the filter cake, carrying the liquid water from the other side of the filter cake through the filter cloth to discharge the dehydration, and is called dehydration by wind.
If both sides of the filter chamber are coated with a filter cloth, the liquid portion can evenly pass through the filter cloths on both sides of the filter chamber to discharge the filter chamber, thereby dehydrating both sides of the filter chamber. After the dehydration is completed, the mechanical pressing force of the filter plate is released, and the filter plate is gradually pulled open by the single block, and the filter chamber is opened separately to complete the unloading of the cake as a main work cycle.
Filter application field is growing wider and brighter
Nowadays, in addition to the high requirements for energy conservation and environmental protection, companies have put forward higher and broader requirements for solid-liquid separation technology and equipment. For the social needs of beneficiation, metallurgy, petroleum, coal, chemical, food, environmental protection and other industries, the application of solid-liquid separation technology and equipment, especially filter products, has been promoted, and the breadth and depth of its application are still expanding.