What are cellulose filter aids? how to use?
2022-03-18
Cellulose filter aid is a substance that can improve the filtration efficiency of filtrate. In order to prevent the filter residue from accumulating too densely and make the filtration proceed smoothly, insoluble inert materials with different degrees of fineness are used.
In the filtration operation, in order to reduce the filtration resistance, increase the filtration rate or obtain a highly clarified filtrate, an auxiliary powdery substance is added, which is called cellulose filter aid. Auxiliary material used to reduce filter cake resistance or filter media resistance. Usually some hard powdery or fibrous solids. Cellulose filter aids are only used in filtration operations for the purpose of obtaining a clean filtrate.
For compressible filter cakes, the addition of cellulose filter aids can increase the rigidity and prevent the increase of filtration resistance. When filtering the suspension containing viscous fine particles, a dense filter cake layer is often formed. Adding cellulose filter aids can change the filter cake structure and reduce the filter cake resistance. The use method of cellulose filter aid: one is to mix the cellulose filter aid with the suspension to be filtered in a certain proportion, and then filter together; the other is to prepare a suspension containing only cellulose filter aid, first Filtration to form a precoat on the filter media, followed by filtration of the slurry. The pre-coating of cellulose filter aid can withstand a certain pressure without deformation, and can prevent the filter cloth from increasing resistance due to clogging.
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