强化重力沉降作用的浮选柱降灰研究

为降低旋流微泡浮选柱(FCMC)处理高灰细泥含量大煤泥的精煤灰分,构建了强化重力沉降作用、沉降物单独回收的沉降-旋流微泡浮选柱(S-FCMC),研究了结构参数对精煤灰分、产率及浮选完善指标的影响,并与最优工艺参数的FCMC进行对比。结果表明:与FCMC相比,最佳结构参数组合的S-FCMC精煤灰分降低1.17%,尾煤灰分提高10.79%,精煤主导粒级(0.045mm粒级)灰分降低2.48%,0.074 mm粒级产率基本相当;沉降物中0.045 mm粒级占本级产率50%,灰分58.16%。S-FCMC通过强化浮选过程中高灰细泥的重力沉降脱除,有效减少高灰细泥对精煤的污染,降灰效果明显。

Enhancement of gravity sedimentation in column flotation to reduce clean coal ash

A sedimentation cyclonic micro bubble flotation column (S FCMC)，adopting structure modifications in conventional cyclonic micro bubble flotation column (FCMC) to enhance gravity sedimentation in froth zone and collect sediment particles as a separate product，was built to avoid high ash fine slime pollution in clean coal.The effect of structure parameters on clean coal ash，yield and flotation perfect index was investigated and evaluated.Optimum results obtained in FCMC and S FCMC show that the latter is 1.17% lower in clean coal ash and 10.79% higher in tailing ash.Moreover，a much obvious reduction is obtained in <0.045 mm clean coal ash (2.48%) whereas both machines are equal in >0.074 mm clean coal yield.The dominant size fraction (<0.045 mm particles) also takes the highest proportion of more than a half in the sediment product with the 58.16% of ash.This means that，by strengthening gravity sedimentation in flotation process，the proportion of high ash fine slime entrainment can be significantly reduced in S FCMC clean coal.