湖南柿竹园多金属矿选矿废水处理试验研究

Experimental Study on Treatment of Mineral Processing Wastewater from Shizhuyuan Polymetallic Mine in Hunan

为了高效稳定的处理选矿废水及降低尾砂的输送阻力保证选厂顺利生产,针对选矿废水排放SS、COD超标等问题,进行了选矿废水水质分析、Fenton氧化机理分析、选矿废水石灰混凝-Fenton氧化-PAM絮凝工艺条件试验及不同废水处理工艺效果对比研究。结果表明,在结合井中加入石灰可破除水玻璃引起所形成的难沉降系统脱稳沉降,SS的去除率高达98%以上且降低了尾砂泵输送阻力,石灰处理后的上层水在反应初始pH=3,H_(2)O_(2)用量1000 mg/L,FeSO_(4)·7H_(2)O用量1000 mg/L,反应时间60 min,COD去除率高达86.98%,使选矿废水COD达标,选矿废水经过Fenton氧化后得到的氧化产物在石灰调pH=7.5~8.5,PAM用量2 mg/L,可快速絮凝沉降使外排水中氧化产物达标,工艺处理成本为1 m3水约需2.95元。研究结果表明,石灰混凝-Fenton氧化-PAM絮凝工艺可快速高效稳定经济处理湖南柿竹园多金属选矿废水。

In order to efficiently and stably treat the beneficiation wastewater and reduce the resistance of tailing sand transport to ensure the smooth production of the processing plant,the analysis of the water quality of the beneficiation wastewater,the analysis of the mechanism of Fenton oxidation,the test of lime coagulation-Fenton oxidation-PAM flocculation process conditions of the beneficiation wastewater and the comparative study of the effect of different wastewater treatment processes were carried out for the problems of SS and COD exceeding the standard of the beneficiation wastewater discharge.It was obtained that the addition of lime in the combination well can break the difficult settling system caused by water glass,and the removal rate of SS can reach over 98%and reduce the resistance of tailing sand pumping.Up to 86.98%to make the beneficiation wastewater COD standard,beneficiation wastewater after Fenton oxidation of oxidation products obtained in lime adjustment pH=7.5-8.5,PAM dosage of 2 mg/L,can be quickly flocculated and settled so that the external drainage of oxidation products to meet the standard,the process treatment cost of about 2.95 yuan per cubic meter water.It was concluded that the lime coagulation-Fenton oxidation-PAM flocculation process can treat the polymetallic beneficiation wastewater from Kakizhuyuan,Hunan province,quickly,efficiently,stably and economically.