管段高紊流强化煤泥柱浮选的应用及作用机理

为了强化煤泥的柱浮选与细粒级回收,调整了旋流-静态微泡浮选床的管流段长度,分析了不同管流段长度下的煤泥浮选效果、产品特性和承载能力变化规律,并结合流体动力学和浮选动力学理论探讨了其强化作用机理。结果表明:管流段长度由1.5 m延长至3.0 m后,在精煤灰分相当的情况下,精煤可燃体回收率提高6.46%;细粒级0.074~0.045 mm和0.045 mm回收率分别提高7.96%和8.41%,设备承载能力提高0.09 t/(h·m2);同时各自增幅都随入料干煤泥量的增加逐渐变大。管流段延长可以增大管流段的紊流动能值,提高颗粒-气泡的碰撞速率,促进整体浮选指标的提升。

Application and affect mechanism of high turbulence in pipe unit enhancing coal column flotation

In order to enhance the coal column flotation and fine size fraction recovery，the pipe unit length of cyclonic- static micro bubble flotation bed was adjusted.The variation of flotation performance，product features and carrying capacity at different length was analyzed with the affect mechanism also investigated combining hydrodynamics and flotation kinetics theory.It is shown that when the length is extended from 1.5 m to 3.0 m，the combustible recovery increases by 6.46% in the case of equivalent ash and the fine size fraction recovery of 0.074-0.045 mm and <0.045 mm is also increased by 7.96% and 8.41% respectively at the same time carrying capacity raising 0.09 t/(h·m2).All of these increase rates increase with the mass flow rate of solids in the feed.The pipe unit length extended improves the turbulent kinetic energy and collision rate between mineral particles and bubbles，which can promote the improvement of the overall flotation index.