粒度和密度组成对煤泥浮选的影响

Influence of granularity and density composition on flotation of coal slime

对某无烟煤泥进行了煤岩组分、密度组成、粒度组成分析,确定了最优浮选条件,并在最优浮选参数下进行了浮选速度试验,对速度试验的产品进行了粒度和密度组成分析,研究了各自的浮选行为。结果表明:高岭石为煤泥的主要成灰矿物,该煤泥中间密度级含量高,且灰分不是很高,高灰细粒级物料含量比较高;4种常见的浮选速度模型比较说明,该煤泥的浮选速率符合一级动力学方程;低灰粗粒主要损失在浮选尾煤中,高灰细泥较多地进入精煤中。高灰细泥通过机械夹带、在煤粒或气泡表面形成覆盖层或随水分夹带进入精煤;低密度级主要集中在J1、J2与J3产品中,高密度级大部分损失在尾煤中,中间密度级较均匀地分布在各产品中。

Taking a kind of the analyzed its petrographical, density, and granularity composition, and conditions. And then, the experiment on flotation rate was also conducted at , In addition, the granularity and density composition of the samples were analyzed, and their, respective flotation behaviors were studied. The results showed： kaolinite was the main ash mineral of coal slime, which contained more intermediate-density slime and less ash; fine slime with high ash conent accounted for large proportion; comparison of four kinds of common modelsfor flotation rate indicated the flotation rate of the coal slime accorded with the first dynamical equation; coarse slime with low ash content mainly lost in flotationrailings, while fine slime with high ash content mostly enterod into the cleaned coal through mechanical entrainment, coating on coal particle and bubble surface or watert; lowdensity sloe mainly ested re＇product Jl, J2 and J3, high-density slime mainly lost in tailhags, while intermediate-density slime evenly distributed in each product.