Hydro cyclone is a high-efficiency separation device which uses centrifugal force to separate two-phase fluids,it has been applied in classification, thickening, dehydration, desliming, separation, washing and other processes. Slurry is fed into the cyclone through the inlet in a tangential or involute direction (depends on how the slurry be fed). Under centrifugal force, large particles will move downwards along outer swirling flow, be discharged through apex as underflow, while fine particles will move upwards through inner swirling flow,be discharged from vortex as overflow.