布尔台选煤厂煤泥水特性的研究

A study on the characteristics of the slurry water at Burtai Coal Preparation Plant

针对布尔台选煤厂煤泥水沉降难、药剂消耗大的问题,采用XRD、激光粒度分析仪和微电泳仪研究分析了煤泥水的矿物组成、粒度组成以及颗粒表面电性。研究结果表明:煤泥主要矿物质为高岭土和蒙脱石,该类黏土矿物遇水易泥化成微米级颗粒,导致煤泥水沉降困难;块煤、末煤系统浓缩机入料中<0.045 mm粒级煤泥含量分别为45.8%、47.1%,细粒含量较高;块煤系统和末煤系统浓缩机入料的Zeta电位的绝对值均高于20 m V,颗粒间静电斥力较大,煤泥水体系较稳定,不易发生絮凝沉降。

Because of the difficulty for the slurry to settle down, Buertai Coal Preparation Plant is facing the problem of a high consumption of reagent. To avert the situation, analysis is made of the mineral composition, size consist and particle surface potential of coal slurry by using XRD, lazer size analyser and micro-cataphoretic apparatus. Result of study indicates that： the main mineral matters in coal slurry are kaolinite and montmorillonite which as a sort of clay substance are liable to undergo degradation in water and finally become micron size particles, making it very difficult for the slurry to settle down; the slurry water fed into the thickeners of the coarse and small coal washing system all contain a high proportion of minus 0. 045mm fine materials which are 45.8% and 47. 1% respectively; and the absolute values of the zeta-potential of the slurry feed to the abovementioned 2 thickeners are all over 20 mV, making the slurry system to remain in a stable state and uneasy to undergo settlement even with the aid of flocculant because of the presence of a large interparticle electrostatic expulsive force.