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This filtration method takes advantage of the two characteristics of the filter aid layer, namely, high porosity and complete chemical inertness(brown fused alumina). It aims to intercept fine particles, obtain clear filtrate, and protect the secondary medium from the pollution of solids in the slurry(80 grit aluminum oxide blasting media). In order to form a precoating layer on the second medium, diatomite slurry should be prepared first (common loose body). 

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It has been reported that the turbidity of the filtrate is lower than that carried by the garden under the condition that the filtration rate is the feed of soap cat(brown aluminum oxide). After the addition of loose body, the space in the filter cake is increased and the filtration resistance is reduced(green silicon carbide). In the following, we will introduce several kinds of precoating layer filtration, which can effectively remove submicron particles and obtain sterile filtrate with high clarity. 

(cheap carborundum powder wholesale suppliers pakistan)If the concentration is too high, and cracks will appear on the precoated layer after shutdown for a period of time(brown aluminium oxide). However, the feed rate of diatomite slurry is equivalent to using diatomite per square meter of filtration area. However, in rotary drum vacuum filter, the thickness of precoating layer reaches above jiangui, so as to extend the working cycle(silicon carbide companies). The recommended thickness of precoating layer is Renlu pig.

The precoated layer filtration is usually combined with the disinfection of electrochlorination, hypochlorite, adsorption of activated carbon and desalination of reverse osmosis(brown fused alumina price). The medium used for filtration of silicon precoating layer is diatomite and other filter aids (called the first medium), the precoated layer is not dense(aluminum oxide abrasive), and the filter cloth or filter screen (called the second medium) supporting the pre coating layer.

The precoating layer is mainly used in animal and vegetable oil, mineral oil, organic solvent, coating, pigment, dye, chemical fiber(white alumina), fertilizer, acid and alkali salt, electroplating solution, chemistry, medicine, anti biomass, wine, beverage, seasoning, sugar, drinking water, industrial water and other fields(aluminum oxide grit). The concentration of diatomite slurry is better than neutral liquid. The main method is to add filter aid into the filter layer.(cheap carborundum powder wholesale suppliers pakistan)

Specifically, the addition of loose body mainly plays a role through the following effects(black aluminum oxide). After the addition of loose body, the compressibility index of filter cake is reduced, thus the specific resistance circle void effect of filter cake is reduced. In order to improve the pollution capacity of the filter and prolong the working life(synthetic corundum), the principle of adding the loose body of healthy vegetable into the filtration is introduced.

(cheap carborundum powder wholesale suppliers pakistan)As a filter aid, the loose body (diatomite) is filtered out together with the solid particles in the filter slurry to form a filter cake on the filter medium(pink aluminum oxide). In general, diatomite filter aids with large void ratio and low compressibility (below kitchen screw) should be selected. The surface structure and shape of particles are complex, so it is an ideal filter aid(emery abrasive). After a certain period of filtration, a new layer needs to be replaced.