As can be seen from Figure 9-6, the slurry should have a driving force to overcome the resistance of the filter cake and the resistance of the filter medium. The driving force of the filtration is the pressure difference between the filter cake and the filter medium. Therefore, depending on the driving force, the filtering methods can be roughly classified into the following categories.
(1) Gravity filtration means that the filtrate is discharged through the filter medium under its own gravity.
(2) Pressure filtration uses a slurry pump or a vacuum compressor to apply pressure to the slurry, forcing the liquid to pass through the filter medium.
(3) Vacuum filtration The vacuum suction caused by the vacuum pump is used to cause the filtrate to be sucked through the filter medium.
(4) Centrifugal filtration, using centrifugal force to remove the liquid in the slurry.
(5) Magnetic filtration combined with vacuum filtration is mainly used for filtration of magnetic products.
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