用铝土矿选矿尾矿制备聚合氯化铝及污水处理试验研究

Preparation of Polyaluminum Chloride Using Bauxite Tailings and Its Application in Wastewater Treatment

研究了用铝土矿选矿尾矿制备聚合氯化铝,考察了铝土矿尾矿焙烧温度、焙烧时间、盐酸浓度、溶出温度和溶出时间对铝溶出率的影响及所制备聚合氯化铝(PAC)对污水的处理效果。结果表明:铝土矿尾矿在750℃下焙烧1.0 h,然后用20%盐酸在85℃下溶解2 h,铝溶出率为90.12%;溶出的铝在适宜条件下聚合获得聚合氯化铝(PAC);在常温下,以0.5 mL/L PAC处理污水,结果污水浊度去除率为90.46%,净化效果较好。

Preparation of polyaluminum chloride using bauxite tailings was studied.The effects of roasting temperature,roasting time,hydrochloric acid concentration,dissolution temperature and time on the dissolution rate of aluminum and the treatment effect of PAC on wastewater were investigated.The results show that the bauxite tailing is roasted at 750℃for 1.0 h,and then dissolved in 20%hydrochloric acid at 85℃for 2 h,the aluminum dissolution rate is 90.12%.The dissolved aluminum is polymerized under optimum conditions to obtain PAC.The wastewater is treated with 0.5 mL/L PAC at room temperature,the turbidity removal rate of wastewater is 90.46%,the purification effect is good.