磨矿对高灰极难选细粒煤泥解离度影响的试验研究

Test study on influence of grinding on liberation degree of high ash content and refractory fine coal slime

首先分析了煤泥的粒度和密度性质,结果表明,该煤泥化现象严重,细粒级灰分含量偏高,同时煤与矸石共生,这可能是煤泥难选的主要原因。其次研究磨矿时间对高灰极难选细粒煤泥解离度的影响,通过煤泥可浮性的指标判断解离情况,从精煤累积产率-灰分曲线来看,若得到相同灰分的精煤,磨矿40 min煤样的精煤理论产率最高,若得相同的精煤产率,磨矿40 min煤样的精煤灰分最低。

Firstly, the size and density properties of a kind of coal slime were analyzed. The results showed that the coal was seriously slimed, and the ash content of fine-particle slime was slightly high, moreover the symbiotic of coal and gangue was determined as the main cause of refractoriness. Secondly, the influence of grinding duration on liberation degree of the high ash content and refractory fine coal slime was studied. The floatability of the coal slime served as the index to evaluate the liberation degree, and the relationship curve of cumulative yield and ash content of clean coal indicated： the theoretical yield of clean coal was the highest after grinding for 40 min at the same ash content of clean coal; the ash content of clean coal was the lowest after grinding for 40 min at the same yield of clean coal.