Filtration cake because of porous structure,
thus leaving a part of the mother liquor in the internal association,
custom content mother liquor in the filter cake called wet content of filter cake,
the lowest also have a few percent, up to more than 80% high. For this reason,
we use second kinds of liquid in the filter cake mother liquor from replacement operation called filter cake washing,
in solid liquid separation is generally referred to as washing.
There are three main purpose of washing
(1) recovery of valuable filtrate from the filter cake, improve filtrate recovery rate
(2) of liquid magazine washing in filter cake, improve the residue in the solid component cleanliness.
(3) washing solution to value a filter cake in the composition or harmful impurities.