Microbubbles have received great interest in the flotation of fine particles. A membrane distributor is developed to generate microbubbles for the flotation of fine apatite particles. Massive microbubbles are continuously formed under the shear flow in the membrane tube. Compared with a Venturi tube the membrane distributor achieves better performance in P₂O₅ recovery and grade. The effects of superficial gas velocity and collector concentration are investigated. It is found that there exists an optimal superficial gas velocity at which the large P₂O₅ recovery is obtained. The high P₂O₅ recovery and grade benefit from large concentration of sodium oleate. To further improve the performance of the flotation column, computational fluid dynamics (CFD) simulation is performed to reveal the gas-liquid flow influenced by inclined plates. The spatial pattern of the bubbles is photographed by a high-speed camera and reasonably characterized by the CFD results. Introducing the inclined plates in the column improves the P₂O₅ recovery. Both experimental observation and simulated data demonstrate that the inclined plates result in the slow circulating flow below the inclined plate. Good bubble-liquid segregation makes the entrained bubbles move upward into the overflow.

微气泡对浮选微粒引起了极大的兴趣。开发了一种膜分配器来产生微泡，以浮选细小的磷灰石颗粒。在膜管中的剪切流作用下连续形成大量的微气泡。与文丘里管相比，膜分配器在P ₂ O ₅回收和分级方面具有更好的性能。研究了表观气体速度和收集器浓度的影响。发现存在最佳的表观气体速度，在该速度下可获得大的P ₂ O ₅回收率。高P ₂ O ₅高浓度的油酸钠可提高回收率和品位。为了进一步提高浮选塔的性能，进行了计算流体动力学（CFD）模拟，以揭示斜板影响的气液流量。气泡的空间图案由高速相机拍摄，并通过CFD结果合理地表征。在塔中引入斜板可提高P ₂ O _5的回收率。实验观察和模拟数据均表明，斜板导致斜板下方缓慢的循环流。良好的气泡-液体分离使夹带的气泡向上移动到溢流口。