湖南柿竹园多金属矿选矿废水处理试验研究

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。

Experimental Study on Treatment of Ore Dressing Wastewater from shizhuyuan polymetallic mine in Hunan

In order to efficiently and stably treat the beneficiation wastewater to ensure the smooth production of the beneficiation plant, the water quality analysis of the beneficiation wastewater and the experimental study of lime coagulation-Fenton oxidation-PAM flocculation of the wastewater were carried out for the problems of SS and COD exceeding the standard of the wastewater discharge of the beneficiation plant. After the lime destabilization and sedimentation, the SS removal rate of the beneficiation wastewater was over 98%; at the initial pH=3, the dosage of H2O2 was 1000mg/L, the dosage of FeSO4·7H2O was 1000mg/L, and the agitation was 60 min, the COD removal rate could be as high as 86.98%; at pH=7.5~8.5, the dosage of 2mg/LPAM could accelerate the oxidation products The results of particle flocculation and sedimentation. It was concluded that the coagulation-oxidation-flocculation technology can treat the wastewater of Kakizhuyuan polymetallic processing plant quickly, efficiently and stably.