浮选柱充填方式及其优化

Packing mode and optimization of flotation column

分析了最常用的填料充填与筛板充填两种方式对浮选环境的作用,并指出:筛板充填整合了浮选柱内的流态和矿化环境,具有稳定气泡、提高浮选和矿化效率的作用.试验结果表明,柱体灰分梯度由充填前的1.62%/m提高到6.80%/m;填料充填可"清洗"泡沫层,降低精煤灰分,稳定泡沫层.提出了在浮选柱中下部采用筛板充填和精选泡沫区采用填料充填的混合充填方式,使浮选柱内真正形成符合矿物分选过程非线性变化的两种分选环境.通过充填方式的优化,提出了筛板充填和蜂窝管充填的混合充填方式.模拟结果表明:蜂窝管的强制性抑制使浮选柱内第2筛板高度处流体的径向分散完全消失,轴向速度已经基本平稳,实现了在较短距离内流体从紊流迅速过渡到"塞流".

The effects of the two usual packing types, namely, filling material and sieve plates, on floatation environment were analyzed and it was pointed out that the sieve plate filling could integrate fluid regime and mineralization environment with the results of stabilizing bubbles and enhancing the efficiencies of the floatation and mineralization. The tests show that the ash gradient of the flotation column increases from 1.62%/m to 6. 80%/m as the result of sieve plate filling; and material filling can clean the froth, reduce the ash of clean coal and make the froth steady. To form the two non-linear-change separation environments suitable for mineral separation, the mixed filling mode of packing sieve plates in the middle and lower parts of the column and packing material in the foam area was proposed. By optimizing the packing mode, the mixed packing mode of the sieve plates and honeycomb tubes was introduced. The simulation results show that obligatory suppression of the honeycomb tubes make the radial distribution of the fluid at the second sieve plate completely disappear and the axial velocity stable. It makes the flow regime transfers from turbulent flow to plug flow in a short distance come true.