摘要：
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 0m/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.%基于CFD方法,采用RSM湍流模型,对实验室旋流-静态微泡浮选柱进行了单相流数值模拟研究,通过PIV实验验证了数值模拟结果与实验一致,并在此基础上研究了循环流量和旋流段入料方式对流场的影响.结果表明:随着循环流量的增加,旋流倒锥段和柱浮选段内的轴向速度和切向速度均增大,循环量一定时,随着入射角度的增大,旋流倒锥段内轴向速度逐渐由"W"形向"U"形转变,切向速度呈下降趋势,柱浮选段内轴向速度和切向速度均降低,当入射角为90°时降低最明显,切向速度基本降至0m/s,旋流倒锥段内湍流耗散率随着入射角的增大而增大.入射角较低时,增大角度可增加微细粒矿物和粗粒级矿物的浮选概率,其中入射角为60°时最佳,继续增加入射角度,旋流矿化方式转变为管流矿化方式,不利于旋流段按粒度差和密度差分选,从而降低分选效率.
