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Since the iron, manganese, aluminum, calcium, etc(silicon carbide price). contained in diatomaceous earth exist in the form of oxides and hydroxides, they are slightly soluble in acidic liquids. The amount of dissolution depends on the strength of the acid, temperature and contact time, so these three conditions must be adjusted to minimize the amount of dissolution(aluminum oxide blasting abrasive). The standard number is the characteristics of the company’s expanded perlite filter aid.

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Usually, the amount of filter aid is very small, only the circular image of the amount of filtrate(white fused alumina). Passive carbon is stable in alkali and acid and can be completely incinerated. However, the pre-alkaline washing method is not effective in reducing the amount of silica dissolved in the alkaline filtrate(green carborundum). The selection principle of filter aid is based on two points, one is the clarity of the filtrate, and the other is the filtration speed.(cheap white alumina grit suppliers south africa)

First, use a medium particle size filter aid to test(white aluminum oxide). made a comparison between perlite and diatomite filter aids, the purpose of loosening the filter cake, increasing the pores and reducing the filtration resistance was achieved. But for occasions where a little dissolution needs to be avoided, acid-washed diatomaceous earth filter aid should be used(silicon carbide companies). At present, the filtration test method is a reliable method to select a suitable filter aid.

(cheap white alumina grit suppliers south africa)In comparison, when filtering alkaline liquids, diatomaceous earth(white corundum). The amount of dissolution depends on the type, strength, temperature, due to the addition of loose bodies, and contact time of the base. Therefore, these conditions must be adjusted to minimize the amount of silica dissolved in the alkaline liquid(arc fused alumina). Therefore, if even a small amount of dissolution is not allowed, pickled diatomaceous earth filter aid should be used.

When filtering strong lye or dissolving a small amount of silica is not allowed, the filter aid filtration method should not be used, but the method of replacing the filter aid with alkaline salts(brown fused aluminum oxide). When filtering slurry with high solid particle concentration, if the filter cake needs to be recovered, inorganic filter aids should not be used(fused alumina), but organic filter aids should be used, which will not cause trouble, which is a silicate mineral.

When filtering acidic liquids, filter aids with coarse particle size can achieve high filtration speed, but the clarity of the filtrate is low: on the contrary(black corundum), fine particle filter aids can obtain high filtrate clarity, but the filtration speed is low. Therefore, when selecting filter aids, follow this principle(black oxide aluminum): from the filter aid grades that can meet the necessary clarity, select the fastest filter, will have a little silica dissolved in the alkaline liquid.(cheap white alumina grit suppliers south africa)

If the clarity of the filtrate obtained at this time is very good and exceeds the expected value by a lot(pink corundum), then it should be selected again Coarse particles are tested in order to not only meet the clarity requirements, but also increase the filtration speed. As mentioned earlier, the pre-pickling method can reduce the amount of silica dissolved in the acid filtrate(glass beads supplier), that is, the impurities are dissolved and removed before filtration.