大淑村选煤厂煤泥水沉降试验研究

通过分析大淑村选煤厂煤泥水性质，说明选煤厂溢流水含有大量极细粒黏土矿物，导致煤泥水沉降效果差，介耗增加，选煤生产无法正常运行。针对以上问题，选煤厂选用聚合氯化铝（PAC）为凝聚剂，聚丙烯酰胺（PAM）为絮凝剂，研究了药剂对煤泥水沉降效果的影响，确定了凝聚剂和絮凝剂的添加方式和最佳用量，并选用聚合氯化铝铁（PAFC）代替PAC进行对照试验，验证PAC和PAM药剂组合的沉降效果。结果表明：随着凝聚剂用量的增加，煤泥水澄清效果逐渐变好，煤泥压缩效果变差；随着絮凝剂用量的增加，煤泥水沉降速度增加，煤泥压缩效果先增加后降低。PAC＋PAM是大淑村选煤厂的最佳药剂组合，PAM用量为500～700g／t，PAC用量为25～30kg／t时，煤泥水沉降效果最好。试验对改进大淑村选煤厂煤泥水沉降效果具有一定的指导意义。

Experimental study on slime water sedimentation in Dashucun coal preparation plant

The analysis of slime water characteristics of Dashucun coal preparation plant show that, the overflow contains lots of extremely fine clay minerals, which lead to poor slime water settling effects, large medium consumption,unstable production. To resolve the above problems, select poly aluminum chloride （PAC） as coagulant and polyacrylamide （PAM） as ilocculant, research their influence on coal slime settling effects, determine the best dosage and appropriate adding method of the coagulant and flocculant. Replace PAC with ferric chloride （ PAFC）, then conduct controlled trials, verify the settling effects of PAC and PAM combination. The results show that, when coagulant dosage increase, slime water become cleaner, and the slime compression effects become poorer. When the flocculant dosage increase, settling velocity of slime increase, and slime compression effects first improve, then become worse. The combination of PAC and PAM is the most suitable for Dashucun coal preparation plant. The settling effects get best while PAM dosage range from 500 g/t to 700 g/t and PAC dosage range from 25 kg/t to 30 kg/t. The research provides reference for Dashucun coal preparation plant transformation.