含铁氰化提金废水综合回收研究  

Recycling of Cyanide Leaching Gold Wastewater Containing Iron

作　　者：周军[1,2,3] 王丽君[1] 张华[1] 宋永辉[1,2,3] 党晓娥[1,2] 张秋利[1,2,3] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]陕西省黄金与资源重点实验室,陕西西安710055 [3]陕西省冶金工程技术研究中心,陕西西安710055

出　　处：《稀有金属》2015年第10期922-927,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金青年基金项目(51204130);陕西省自然科学基础研究计划项目(2012JM7013);西安建筑科技大学基础研究基金项目(JC1212)资助

摘　　要：离子交换树脂法综合回收氰化废水被认为是最有应用前景的技术之一,但对于含铁氰化提金废水,直接应用该方法则会遇到因铁氰络合离子存在而引起的树脂钝化失活问题。针对某黄金冶炼厂含高铜、铁氰化提金废水特点及处理要求,进行了ZnSO4,NaOH两步沉淀、联合A-21S树脂吸附处理新工艺实验研究。结果表明:向含铁氰化废水中加入适量ZnSO4,其Fe络合离子去除率达100%,CN-T和Cu络合离子沉淀率均可达85%以上,沉淀物主要以Zn2[Fe(CN)6],Zn(CN)2和ZnCu2(CN)4为主。经分离后的滤液中再次加入适量NaOH,可使溶液中的Cu,Zn络合离子再次快速沉淀,去除率分别可达37.08%,70.90%。对再次分离后的最终滤液采用A-21S树脂吸附,在液固比(滤液与树脂体积比)为100∶3、常温搅拌75min时,废水中Au络合离子的回收率达96%以上。采用该工艺,最终溶液中CN-T,Fe,Cu,Zn,Au络合离子含量比原始废水中分别下降了94.54%,100%,96.34%,99.87%,96.76%,最终溶液可返回氰化浸金系统循环使用。For comprehensive recycling of cyanide wastewater, ion exchange resin method is considered as one of the most promising technologies. But for cyanide wastewater with iron of leaching gold, the resin deactivation problem resulting from the presence of iron i- ons would occur with direct application of this method. Mainly aiming at one gold smelter wastewater containing high copper and high i- ron cyanides, a new combining process of treating the wastewater was researched, which contained two-step precipitation with ZnSO4 and NaOH combined with A-21S resin adsorption. The results showed that the removal rate of iron ions could reach 100%, CNT and Cu ion precipitation rate could reach more than 85%, when suitable amount of ZnSO4 was added to the iron cyanide wastewater. The precipitations were mainly Zn2 [ Fe （CN） 6 ], Zn （CN） 2 and ZnCu2 （CN） 4. And then adding suitable amount of NaOH to the filtrate af- ter separation could make Cu and Zn ion precipitate quleldy and the removal rates could reach 37.08% and 70.90% , respectively. The recovery rate of Au ion in wastewater was more than 96% by A-21S resin adsorbing the final separation filtrate under the following conditions ： the liquid-solid ratio （ volume ratio of f＇dtrate to resin） of 100：3 and stirring for 75 rain at room temperature. Using this re- cycling process, the ion contents of CNT , Fe, Cu, Zn, Au in the final fihrate were decreased by 94.54%, 100%, 96.34%, 99.87%, 96.76%, respectively, compared with those in the raw wastewater. The final solution could be recycled to the cyanide gold leaching system.

关 键 词：氰化废水 铁氰络合离子 沉淀 树脂吸附 金 

分 类 号：TD926.5[矿业工程—选矿]