It has been proved from theory and production practice that under the condition that the structural parameters of small diameter hydrocyclone group remain unchanged, it is affected by feed pressure and feed rate Limestone classification cyclone station 。 The effect of concentration is greater. 1、 Operation principle: the classification principle of hydrocyclone: pulp is fed into the hydrocyclone through the tangential feed port under a certain pressure, so a rotary flow is formed in the hydrocyclone. In the center of the cyclone, the pulp rotation speed reaches the maximum, so the centrifugal force is the largest. The effect of slurry loose movement to the surrounding, I, operation principle, classification principle of hydrocyclone: pulp in the Hydrocyclone A low pressure zone is formed around the central axis. At this time, air is inhaled through the underflow port and fed into the cyclone through the tangential feed inlet under a certain pressure? A low pressure air column is formed at the central axis. 2、 The influence of operation factors (1) the feed pressure is an important parameter of cyclone operation. The forward feed pressure can increase the pulp flow rate, increase the centrifugal force on the material, and advance the classification power and underflow concentration. However, it has little effect to reduce the classification particle size by increasing the pressure, but the kinetic energy consumption is greatly increased, and the wear of all hydrocyclones, especially the underflow nozzle, is becoming more and more serious. (2) Feed rate: increase the feed rate, the grading particle size will become coarse, reduce the feed amount, the grading particle size will become smaller. Slime dense medium cyclone (3) Concentration: when the cyclone size and pressure must be kept, the feed concentration has an important impact on overflow particle size and classification power. When the feed concentration is high, the viscous resistance of the fluid increases, the grading particle size becomes coarse and the grading power decreases. (4) Feed size: the change of feed size will obviously affect the classification effect of hydrocyclone. When other parameters are constant, when the content of material smaller than grading size is less, the content of fine particles in underflow is less than that in overflow?