复配絮凝剂对细粒煤泥沉降的影响研究

Study on the effect of compound flocculants on the settlement of fine coal slime wate

以细粒难沉降煤泥为研究对象,以上清液浊度、初始沉降速度及煤泥水综合评价指标作为评定依据,研究了不同离子类型聚丙烯酰胺(PAM)单一及组合使用时对煤泥水沉降的影响。结果表明,絮凝剂单独使用时,非离子型PAM对煤泥水絮凝效果最好,在絮凝剂用量为180 g/t时,综合评价指标最高,为7.86 mm/(s·NTU),煤泥水上清液浊度为246.3 NTU。以2∶1比例对分子量为1000万和1400万的非离子型PAM进行复配,使用复配絮凝剂时煤泥水沉降效果进一步提高,当复配絮凝剂用量为180 g/t时,煤泥水沉降综合评价指标最高,达到27.86 mm/(s·NTU),同时絮团的分形维数增加,表明絮团的结构更加紧密,有利于提高煤泥水沉降效果。

The paper studied the impacts of ionic types and compound mixing of polyacrylamide(PAM)flocculants on the settling behaviors of fine-size and hard-to-settle coal slime water by measuring the supernatant turbidity,initial settling speed,and comprehensive evaluation indexes.The results showed that when the flocculant was added signally,the PAM of nonionic type could achieve the best flocculation effect at 180 g/t with the highest comprehensive evaluation index of 7.86 mm/(s·NTU)and the supernatant turbidity 246.3 NTU.Settlement behavior was further intensified using the compound flocculant made by the nonionic PAM with molecular weights of 10 million and 14 million mixed at a 2∶1 ratio.The comprehensive evaluation indexes of coal slurry water achieved the highest value 27.86 mm/(s·NTU)at a dosage of 180 g/t by using the compound flocculant and the fractal dimension of the flocs was found increased.This indicated that the floc structure became compact,which is favorable for the settlement of coal slime water.