Three Main Factors That Affect the Decanter Centrifuge Effect
The production capacity of the decanter centrifuge depends on the density difference between the solid and liquid phases and the length of the sedimentation zone. The closer the density difference between the solid and liquid phases and the higher the viscosity of the slurry, the more difficult to separate and settle. In actual production, there are three main factors that affect the separation effect of the decanter centrifuge: the feed temperature, feed rate, and abnormal process conditions.
A. Feeding temperature: The temperature of the slurry can directly affect the viscosity of the mother liquor. Generally speaking, the higher the solution temperature, the lower the viscosity, the thinner the liquid film on the solid phase, and the easier the fine particles to settle. And the liquid in the pores will be less.
B. Feeding rate: Sometimes, large feeding amount will lead to poor separation effect, mainly because the sedimentation time of the particles in the decanter centrifuge drum is not enough. The premise of achieving the separation conditions designed by the decanter centrifuge is that the time for the solid particles to settle on the drum wall must be less than the residence time of the particles in the drum. The effective residence time of the slurry to be separated in the drum must be guaranteed, So that the solid particles have enough time to settle out. In our practical experience, the separation effect is not good when the feed volume is 1m3 / H for the same material, but when the feed volume is 0.5m3/h, the separation effect will be ideal.
C. Abnormal process conditions: mainly refers to the insufficient crystal content in the feed slurry or the crystals are not crystallized but flocculated, which is very difficult for the decanter centrifuge to obtain the ideal separation effect.