多金属矿尾矿库溢流水深度处理并回用于萤石浮选试验

Test on Advanced Treatment of Overflow Water from Polymetallic Tailing Pond and Its Reuse in Fluorite Flotation

为解决湖南某多金属矿选矿厂尾矿库溢流水难以资源化利用,造成环境污染和水资源浪费问题,进行了废水处理后回用于现场浮钨尾矿(CaF_(2)含量为20%~22%)浮选萤石可行性研究。结果表明,高碱度、高COD废水采用次氯酸钠氧化、电氧化、活性炭吸附和芬顿氧化工艺处理,均能有效降低废水的COD,且电氧化、活性炭吸附和芬顿氧化工艺可降低废水的浊度;与废水直接回用于萤石浮选相比,各工艺处理后的废水的浮选效果不同程度改善,以活性炭吸附工艺效果最好,其精矿指标与实验室清水选矿指标接近,精矿CaF_(2)品位为95.63%、回收率为43.16%。因此,现场多金属选矿废水采用活性炭吸附工艺处理后可回用于萤石浮选。

In order to solve the problem of environmental pollution and water resource waste caused by the difficult in utilization of the overflow water from polymetallic tailings pond in Hunan Province,a feasibil ity study was conducted on the reuse of treated wastewater for flotation fluorite from on-site tungsten tailings(CaF_(2)content of 20%to 22%).The results showed that the wastewater with high alkalinity and high COD treated by sodium hypochlorite oxidation,electro-oxidation,activated carbon adsorption and Fenton oxida tion process could effectively reduce the COD of wastewater,and electro-oxidation,activated carbon ad sorption and Fenton oxidation process could reduce the turbidity of wastewater.Compared with the wastewa ter directly reused for fluorite flotation,the flotation effects of the treated wastewater from each process were improved,with the best effect of the activated carbon adsorption process.The concentrate index of fluorite flotation was close to the laboratory clear water,with CaF_(2)concentrate grade of 95.63%and recovery rate of 43.16%,which means the treated water by the activated carbon adsorption process can be reused in fluorite flotation process.