ATP/PAM接枝聚合物对煤泥水的絮凝研究

A study on ATP/PAM graft copolymer and flocculation of slime

为了改善煤泥水的沉降性能,研究了在氧化还原体系下,将酸活化凹凸棒石粘土(ATP)与丙烯酰胺单体混合发生接枝聚合反应,生成凹凸棒石粘土/聚丙烯酰胺接枝聚合物(ATP/PAM),并对煤泥水进行了絮凝处理,同时考察了絮凝剂浓度对絮状物沉降速率、压缩层压实程度以及上层清液透光率等的影响,探讨了ATP/PAM的絮凝机理。实验结果表明,特性粘数接近的ATP/PAM在很宽的添加量范围比普通PAM具有更好的絮凝效果。ATP/PAM处理后获得的絮状物体积更小,压缩层的压实程度更好,且在絮凝剂浓度相同的情况下,其上层清液的透光率更高。这是由于ATP/PAM降低了分散体系的ξ电位并且具有不同于普通PAM的高分子结构造成的。

In this paper,ATP/PAM is prepared by the graft copolymerization of acid activation ATP and water-soluble acrylamide monomer under the redox system.It is applied to slime treatment and the effect of flocculent concentration on the settling velo,compression degree of compressed layer as well as transmittance of the supernatant are studied.Also the flocculation mechanism of ATP/PAM is discussed.The experimental results show that ATP/PAM with similar intrinsic viscosity has better flocculating effect than ordinary PAM in a wide range.ATP/PAM has smaller volume,better compression degree of compressed layer and higher transmittance of the supernatant than ordinary PAM.All of the above are attribute to reducing the ξ potential of dispersions by ATP/PAM and the different polymer structure from ordinary PAM.