How is the Centrifugal Filtration Process Achieved

Solid Liquid Separator December 13, 2024 Centrifuge

The separation process performed by a centrifuge can be classified into the following types based on its operating principle:

Centrifugal Filtration
Centrifugal Sedimentation
Centrifugal Separation

Centrifugal Filtration Process:

This method is commonly used to separate suspensions containing larger solid particles (>10 μm) with relatively high concentrations.

Structure and Functionality:

The drum of a filtration centrifuge consists of a liquid barrier plate (1), a drum wall (2), and a drum bottom (3).
The liquid barrier plate prevents the suspension from overflowing from the top and allows for the formation of a specific thickness of the filter cake inside the drum.
The drum wall is uniformly perforated with small holes to allow the filtrate to exit.
A filter medium, typically composed of a metal mesh base and a filter cloth, is laid on the inner wall of the drum.

Process Description:

When the suspension is added into the rotating drum, the centrifugal force causes the suspension's solid particles to move radially outward and accumulate on the surface of the filter medium, forming a filter cake. Meanwhile, the liquid passes through the filter cake, the filter medium, and the small holes on the drum wall, being discharged outward. This process achieves the separation of solid particles from the liquid.

Enhanced Efficiency in a Centrifugal Force Field:

In the centrifugal force field, the suspension experiences forces thousands of times greater than gravity, significantly enhancing the filtration process and accelerating filtration speed.
As the process continues, the filter cake is progressively compressed under centrifugal force, and any liquid within the pores of the filter cake is further expelled. This results in a relatively dry filter cake.