絮凝剂用量对尾矿浓密的影响机理

Influence mechanism of flocculant dosage on tailings thickening

以某铜尾矿为实验对象,每吨尾矿中分别添加阴离子聚丙烯酰胺0、10、25、40和55 g,进行浓密实验.在前期(1 h)尾矿浓密分数随着絮凝剂用量增加逐渐递增,由63.98%增加至68.20%;而后期(12 h)浓密分数则随絮凝剂用量的增加略有下降.结合实验结果,将每吨尾矿中絮凝剂添加量由少至多划分为低含量(0～10 g)、合适含量(10～25 g)、高含量(25～40 g)和超高含量(40～55 g)四个区间,提出了不同区间絮凝剂对尾矿浓密的影响机理,分别体现为部分吸附、吸附架桥、保护和包裹作用.

Taking copper tailings as an experimental object, dynamic thickening experiments were conducted by adding 0, 10, 25, 40 and 55 g of anionic polyacrylamide （APAM） pei tonne of the tailings, respectively. It was found that the thickening concentration of the tailings at the prophase （1 h） increased gradually from 63.98% to 68.20% with increasing flocculant dosage, but at the anaphase （12 h） the value fell slightly when the flocculant dosage increased. In combination with experimental results, the flocculant dosage was divided into four intervals from less to more, low concentration （0 to 10 g per tonne of the railings）, appropriate concentration （10 to 25 g per tonne of the tailings）, high concentration （25 to 40 g per tonne of the tailings）, and ultrahigh concentration （40 to 55 g per tonne of the tailings）. The influence mechanisms of fiocculant dosage on railings thickening in the different intervals were put forward, which present partial adsorption, adsorption bridging, protection, and encapsulation roles, respectively.