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本文以实验室型浮选机研究为基础,从微观和宏观流体动力学两个方面讨论了两种典型浮选机(Wemco和Denver)的性能,并进行了煤的浮选试验。试验证明,W槽耗能低,充气量大,对于我国易选煤(灰分<15～16％)的浮选最为适宜;D槽能适应我国粒度较粗的难选煤(灰分介于20～30％);安装超声强化装置的W槽在浮选我国难选煤时获得了最优成绩,浮选数量效率竟达98％。流体动力学研究从理论上阐明了上述三种不同的机理,并得出了浮选槽内湍流微观脉动压力衰变方程I=ax~(-b)和宏观压力数N_p=(g(H+h))/(n~2D~2)为浮选机设计按比例转换(放大和缩小)提供了流态相似的依据。
Based on the research of laboratory flotation machine, this paper discusses the performance of two typical flotation machines (Wemco and Denver) from both microscopic and macroscopic hydrodynamics and conducts coal flotation tests. Experiments show that the energy consumption of W slot is low and the aeration volume is large, which is most suitable for the flotation of easily-selected coal (ash <15-16%) in our country. D-groove can adapt to the coarse coal- 30%). The W slot with ultrasonic intensifier has obtained the best result in the flotation of refractory coal in our country, and the flotation efficiency is as high as 98%. The fluid dynamics studies theoretically elucidated the above three different mechanisms, and concluded that the turbulence micro-turbulent pressure decay equation I = ax ~ (-b) and the macroscopic pressure N_p = (g (H + h )) / (n ~ 2D ~ 2) provides a basis for similar flow patterns for flotation machine designs that scale up (zoom in and out).