Abstract: Abstract: Based on the CFD method, the single-phase flow of the cyclone-static microbubble flotation column was simulated by RSM turbulence model, the numerical simulation results were consistent with the PIV experimental results. On the basis of this, the effect of circulation flow rate and feeding mode on flow field in cyclone zone was researched. The results show that: with the increase of the circulating flow rate, the axial velocity and tangential velocity in the swirl inverted cone and column flotation zone are increased, when the circulation flow rate is constant, with the increase of the incident angle, the axial velocity gradually changes from "W" type to "U" type in the swirl inverted cone zone, the tangential velocity decreases with the angle of incidence, the axial velocity and tangential velocity in the column floatation zone are reduced, when the incident angle is 90 °, it decreases to 0 m/s, and the turbulent dissipation rate in the cyclonic reversal cone also increases with the incident angle. When the angle of incidence is low, increasing the angle increases the flotation probability of fine-grained and coarse-grained minerals, and the angle of incidence being the best at 60 °, continue increasing the incident angle, the way of mineralization will changes from cyclone to pipe flow, which is not beneficial to the cyclone zone to sort the particle by the difference in size and density, thereby reducing the separation efficiency.