Hydrocyclone is the most attractive device for removing solid particles from liquid . It utilizes the centrifugal force to effect the separation. Thus, Hydrocyclone is a Static Separator based on centrifugal separation in which a vortex generated with a cono-cylindrical configuration. The feed flow, which is a slurry of small particles, into liquid enters tangentially into the cyclone and is divided into underflow, which carries most of the solids, and overflow, which contacts most of the Liquid. The separation of solid from liquid depends on the particle size and particle density. Centrifugal force throws the particles out against the wall and they subsequently drop into the outlet hopper. Cyclone consists of vertical cylinder with conical bottom. The inlet point is near the top of the cylindrical portion. The particles separated are collected at the bottom.
Dimensions of Individual Cyclones range from 10 mm to 2500 mm. Capacities (flow Rates) of Hydrocyclone (single unit) may vary between 0.1 to 10000 m3/hr. The particles that are separated could range from 10 to 500 micron. Operating pressure will vary between 0.2 to 10 Bar; higher pressure is usually for smaller particle separation. The underflow solid concentration will be between 40 to 60% by volume. It cannot be higher, otherwise the flow at the bottom shall be restricted.