Flocculation of flotation tailings in presence of silicate gel and polymer

高分子有机物与硅胶混凝处理浮选尾矿（英文）

Flotation tailings were successfully flocculated in the presence of cationic polyacrylamide and silica gel.The effects of various parameters such as polymer weight,charge density,and pH on the rate of flocculation were also investigated in the current study.The flocculation mechanism of the flocculant on tailings was investigated using zeta potential and Fourier transform infrared(FTIR)measurements.The results obtained reveal that 1)sodium silicate gel,used as a binder for the consolidation of tailings form primary flocs,acts as an anchor and the adsorption of polymer flocculant on these anchors results in the formation of larger flocs and,consequently,enhanced settling rate;2)flocculation in the presence of silica gel and polymer has a faster settling rate than single-polymer flocculation owing to the mechanisms of charge neutralization and bridging as identified using zeta potential and FTIR measurements.A pilot level study was conducted to investigate the influence of processed water on the flotation of scheelite.The results show that the proposed tailing disposal method could improve scheelite recovery by 2%(approximately)and could reduce the daily operation costs of the plant by approximately 108.57 USD.

采用阳离子聚丙烯酰胺与硅胶作为絮凝剂成功实现尾矿混合絮凝,考察了有机高分子絮凝剂分子量、电荷密度、溶液pH值等参数对絮凝沉降速度的影响。通过动电位、红外光谱研究了混凝剂絮凝尾矿的作用机理,结果表明:1)硅胶作为尾矿颗粒的粘结剂,先将尾矿形成第一集合颗粒;高分子絮凝剂絮凝第一集合颗粒并形成较大的絮团,同时加速尾矿沉降;2)动电位与红外光谱分析结果表明硅胶与有机高分子组合对尾矿的沉降速度效果明显优于单一絮凝剂,主要原因是混凝剂同时兼具中和电荷和桥联作用。考察了混凝处理尾矿回水对白钨矿浮选指标的影响,试验结果表明:采用回水能够提高白钨矿回收率2%,且每天能够为企业节约108.75美元的成本。