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The flowing characteristics of coal slurry in floatation cyclone were investigated on the bases of theoretical calculation of velocity and pressure distributions by Navier-Stokes equation by means of reasonable simplification and modification. Thus, the position of multiphase interface of gas-liquid in the cyclone was located. Apart from this, it could be concluded that an air cylinder exists in the cyclone, the volume of which depends on the velocity, pressure of the fed material and the diameter of overflow pipe. The up-flow of jet stream with fine particles is limited by air cylinder, which is of great significance for the separation process in the flotation cyclone. Meanwhile, separation mechanism by floatation cyclone can be elucidated. Besides, it has been found that there are two types of fluid flow in floatation cyclone, inflow and outflow. In the cases of floatation cyclone with diameter of 100 mm, in the zone with the radius more than 31.5 mm, the radial velocity belong to outflow, and vice versa

Velocity and pressure distributions characteristics of coal slurry in floatation cyclone