working principle

Thickener is a solid-liquid separation equipment based on gravity settlement. It is usually a shallow cylindrical groove with conical bottom made of concrete or metal welded plates as structural materials. The slurry with solid weight of 10%-20% can be concentrated by gravity settling of the thickener to the bottom flow slurry with solid content of 45%-55%. The thickened bottom flow slurry can be discharged from the bottom flow outlet at the bottom of the thickener by means of the rake installed in the thickener with slow running (0.2-0.35r/min). The clarifier produced by concentration (overflow) is left in the upper part of the thickener and discharged by the annular chute at the top. 

Concentration process: The pulp entering the pond gradually naturally forms five different zones. A clarification zone, B free subsidence zone, C sedimentation zone, D concentration zone and E slime zone. Concentration of pulp begins with free subsidence zone B, but the main process of concentration is in concentrate zone D.