沉淀-电吸附联合处理氰化提金废水

摘要

采用沉淀—电吸附联合工艺处理高铜高铁提金氰化废水，对处理过程的反应原理和工艺流程进行了系统的分析说明，同时对关键处理结果进行了讨论。研究表明，采用沉淀—电吸附联合工艺处理高浓度氰化提金废水是可行的。经 ZnSO4沉淀处理后，废水中 Fe2+、Cu2+及游离 CN-的沉淀率分别达到100%、85.89%和99.43%。电吸附处理后，废水中的 Cu2+、SCN-与游离 CN-的去除率分别为98.68%、43.60%和99.57%。经 X 射线衍射（XRD）分析表明，硫酸锌沉淀后的沉淀物主要由 Zn2[Fe（CN）6]、Zn（CN）2和 CuCN 组成，而电吸附处理后得到的沉淀物90%以上为 CuSCN，沉淀物及饱和阳极板可经综合处理回收氰化物与金属，同时废水可返回浸出系统循环利用。%Trea tment of gold mine wastewater with the characteristics of cyanide,high copper,iron by the chemical precipitation-electric adsorption combined technology,the analyzed and discussed were focused on the reaction principle,the technological process and the result of the reaction.Research shows that the method is viable to treatment wastewater containing high concentration of cyanide.After precipitation by ZnSO4,the precipitation rate of free cyanide,Fe and Cu in wastewater were 100%,85.89% and 99.43%,respectively.After advanced treatment by electric adsorption,the removal rates of Cu,thiocyanate,and free cyanide were 98.68%, 43.60% and 99.57%,respectively.The XRD analysis showed that the sediment from zinc sulfate precipitate mainly includes Zn2 [Fe(CN)6],Zn(CN)2 and CuCN,and the sediment from the electric adsorption is mainly CuSCN. Sediment and the anode plate after saturated adsorption can be comprehensive treatment and recovery of cyanide and metal,and the wastewater can be returned to the leaching system for recycling at the same time.