振动流化床的分选特性

Separation Characteristic of Vibrated Fluidized Bed

研究了振动流化床的流化特性及分选性能 ,分析了矿粒在振动流化床中的受力情况 ,分析了影响矿物按床层密度分层的主要参数 ,揭示了振动流化床的分选机理 .试验结果表明 :在适当的工艺及操作条件下 ,振动流化床床层密度均匀稳定 ,各密度最大相对误差仅 0 .32 % ,加重质宏观返混较小 ,具有良好的分选特性 .分选 6～ 1 mm级细粒煤 ,数量效率为 91 .66% ,分选精度( Ep值 )达 0 .0 7。

The fluidization characteristics and separation performance of vibrated fluidized bed (VFB) were researched. The force acting on mineral particle in VFB was specially analysed, and the main parameters interfering the separation of mineral according to bed density were also studied. Lastly, the separation mechanism of VFB was revealed. The result shows that the bed density of VFB is uniform and stable with a weak back mixing of medium solids under the condition of suitable technological and operating parameters. The maximum relative error of bed densities is 0.32%. The VFB has a good separation effect and can separate the fine coal of 6～1mm with a probable error (Ep value) of 0.08 and a quantitative efficiency of 91.66%, providing a new dry separation technology for fine coal.