Dewatering solids suspensions in pusher centrifuges - using hydrocyclone train for pre-thickening with feed control adjusted to solids content of feed slurry

摘要

Solids suspensions in liquids are dewatered to a low residual moisture content in a pusher centrifuge. A hydrocyclone is mounted before this and the feed to it is controlled so that the total flow of solids in a given time period remains constant. This control can be achieved either by measuring the load on the centrifuge, or by measuring the density of the slurry leaving the final hydrocyclone or by weighing the primary hydrocyclone. Used for dewatering slurries which are liable to marked variations in their solids content. These can lead to blockages in the outlet from the hydrocyclones or increased residual moisture in the prod. The system described avoids this.