ABSTRACT

Flotation cell and flotation column are widely used as the separation equipment for coal slime. In order to obtain better flotation results for different particle sizes, different turbulence intensity of flow field need to be created, but the turbulence intensity is not easy to adjust in conventional flotation equipment. In this paper, a new fluidized bed flotation column was designed to control turbulence intensity by the liquid velocity and static bed height. The effects of liquid velocities (0.198 m/s,0.226 m/s,0.254 m/s) and static bed heights (0.317 m,0.343 m,0.380 m) on coal slime flotation with different particle sizes were studied, which were evaluated by the combustible recovery, ash content, and the yield of clean coal. The research results showed that the flotation performance of coarse particles is better with low turbulence caused by low liquid velocity and great static bed height than that in high turbulence. Under the condition of high liquid velocity and low bed height, a high turbulence intensity environment is created, and the fine particle separation efficiency is better than that in low turbulence.

摘要

浮选机和浮选柱被广泛用作煤泥的分离设备。为使不同粒径的颗粒获得较好的浮选效果，需要产生不同湍流强度的流场，而常规浮选设备湍流强度不易调节。在本文中，设计了一种新型流化床浮选柱，通过液体速度和静态床层高度来控制湍流强度。研究了液速（0.198 m/s、0.226 m/s、0.254 m/s）和静床层高度（0.317 m、0.343 m、0.380 m）对不同粒度煤泥浮选的影响，通过可燃物回收率、灰分含量和精煤收率。研究结果表明，粗颗粒的浮选性能在低流速和大静床高引起的低湍流条件下优于高湍流条件下的浮选性能。在高液速、低床高条件下，创造高湍流强度环境，细颗粒分离效率优于低湍流。