Operation of cellulose filter aids
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.
There are two types of filter cakes formed by filtration: one type has considerable rigidity, and the structure does not change with the increase of operating pressure, which is called incompressible filter cake; the other type of filter cake has a structure that changes with the increase of operating pressure, resulting in filter cake. The filtrate flow channel in the filtrate shrinks, and the flow resistance of the filtrate increases sharply, which is called compressible filter cake.
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 aids: 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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