新型絮凝剂TG对煤泥水沉降效果的影响

Effect of a new flocculant TG on sedimentation performance of coal slime water

针对选煤厂煤泥水存在难沉降、药剂消耗大等问题,以宁夏枣泉选煤厂煤泥水为研究对象,对其进行粒度组成和矿物组成等性质分析。分别采用新型絮凝剂(TG)、阳离子聚丙烯酰胺(CPAM)、氯化钙(CaCl2)以及聚合氯化铝(PAC)对煤泥水进行沉降试验,并对比研究2种药剂联合使用对煤泥水沉降效果的影响。结果表明:该煤泥<0.045 mm质量分数为74.88%,灰分为69.58%,且含有大量易泥化的黏土矿物,导致煤泥水难沉降。添加单种药剂时,TG效果最好,随TG用量增加,上清液浊度不断降低,沉积层高度先降低后增加,初始沉降速度不断增大。2种药剂联合使用时,TG与CPAM联合使用效果最好,最佳用量为60 g/t的TG和20 g/t的CPAM,初始沉降速度、沉积层高度、上清液浊度分别达到50.00 cm/min、2.30 cm和39 NTU。

In order to solve the problems of difficult settling and high consumptions of flocculants for coal slime water in coal preparation plants,the particle size distribution and mineral composition of the coal slime water from Zaoquan Coal Preparation Plant in Ningxia were analyzed.Sedimentation tests were conducted using a new type of flocculant(TG),cationic polyacrylamide(CPAM),calcium chloride(CaCl2),and polyaluminum chloride(PAC)respectively.The effect of combining two types of flocculants on the settling performance of the coal slime water was also studied.The results show that the coal slime water had a content of<0.045 mm of 74.88%and an ash content of 69.58%,and contain a large amount of clay minerals that are easy to mud,which makes the coal slime water difficult to settle.When a single type of flocculant is added,TG has the best effect,and with the increase of its dosage,the turbidity of the supernatant decreases continuously,the sedimentation layer height first decreases and then increases,and the initial settling velocity increases continuously.When two types of flocculants are combined,the combination of TG and CPAM have the best effect,and the optimal dosage is 60 g/t of TG and 20 g/t of CPAM,with an initial settling velocity of 50.00 cm/min,a sedimentation layer height of 2.30 cm,and a supernatant turbidity of 39 NTU.