Operation method and separation process of decanter centrifuge

- May 29, 2019-

The decanter centrifuge is a new type of horizontal screw discharge centrifuge. Its working principle is to use the solid-liquid specific gravity difference and expand it by several thousand times by the centrifugal force field. The solid phase is settled under the action of centrifugal force. Solid-liquid separation is achieved and the body is discharged separately under the action of a special mechanism.


The decanter centrifuge is a centrifugal separator that separates the components of the suspension by centrifugal sedimentation. The suspension added to the drum forms a circular liquid layer under the action of centrifugal force, and the solid particles settle on the drum wall to form a sediment. The clarified liquid is discharged through a drum overflow or a pipette. At the end of the separation, the sediment is discharged manually or mechanically. During the process of sedimentation to the drum wall, the solid particles also move axially with the liquid flow. When the feed amount is too large, the liquid flows to the overflow port, and the fine particles that have not settled to the drum wall are discharged with the separation liquid. Rotate the drum to make the separation liquid turbid.


For difficult-to-separate suspensions with small solid-liquid phase density difference, small solid particles or high liquid viscosity, a sedimentation centrifuge with a high separation factor should be selected to prolong the residence time of the suspension in the drum to ensure the clarification of the separation liquid. The sedimentation centrifuge has a wide application, and is especially suitable for the separation of the suspension in the centrifugal filtration when the solid particles are easy to block the filter medium and the filtration resistance is too large or the fine particles are excessively lost, but the sediment has a high moisture content.