铜渣辅助铁粉去除含铜砷酸性溶液中铜、砷的试验  

Experiment on removal of copper and arsenic from acid solution containing copper and arsenic by iron powder and copper residuum

作　　者：潘辉 朱北平 刘洪嶂 陆开臣 熊义期 PAN Hui;ZHU Beiping;LIU Hongzhang;LU Kaichen;XIONG Yiqi(Wenshan Zinc-Indium Metallurgy Co.Ltd.,Yunnan Tin Group,Wenshan 663700,China)

机构地区：[1]云锡文山锌铟冶炼有限公司,云南文山663700

出　　处：《中国有色冶金》2023年第6期67-72,共6页China Nonferrous Metallurgy

摘　　要：湿法炼锌过程中,常采用铁粉置换法去除含铜砷酸性溶液中的铜、砷,但该方法要求溶液中n_(Cu):n_(As)≥3:1才能保证As的彻底沉降。正常生产的含铜砷酸性溶液中n_(Cu):n_(As)≤3:1,As沉降不彻底,容易产生砷化氢有毒有害气体。某冶炼企业在锌冶炼过程中产出含铜55%~60%的副产品铜渣,提出在铁粉置换工序中加入铜渣,并进行了试验验证。结果表明,在原料为该企业含铜砷酸性溶液前提下,当铁粉过量系数1.5倍时,不加入铜渣,铜砷去除率仅57.14%、26.73%;加入2 g/L铜渣,则铜砷去除率可达92.35%、89.85%;在较佳工艺参数反应时间1 h、温度80℃左右、铜渣添加量2 g/L、铁粉过量系数1.5倍条件下,除铜、砷率均可达到90%以上。该方法可减少铁粉消耗量、降低生产成本,为锌冶炼企业处理含铜砷酸性溶液提供了参考。In the process of zinc hydrometallurgy,iron powder replacement method is often used to remove copper and arsenic from acid solution containing copper arsenic.However,this method requires n_(Cu):n_(As)≥31 in the solution to ensure the complete settlement of As.In the normal zinc hydrometallurgy,n_(Cu):n_(As)≤3:1 in acidic solution containing copper and arsenic,the As deposition is not complete,and it is easy to produce toxic and harmful gases of hydrogen arsenide.A smelting enterprise produces copper residuum as by-product,containing 55%~60%copper,in the zinc smelting process.A method of adding copper residuum in the iron powder replacement process was proposed and verified by experiments.The results show that when the excess coefficient of iron powder is 1.5 times,without adding copper residuum,the removal rate of copper and arsenic is only 57.14%and 26.73%resp.The removal rate of copper and arsenic can reach 92.35%and 89.85%by adding 2 g/L copper residuum.Under the conditions of better process parameters,reaction time 1 h,temperature 80℃,copper residuum addition 2 g/L,iron powder excess coefficient 1.5 times,the removal rate of copper and arsenic can reach more than 90%.This method can reduce the consumption of iron powder and reduce the production cost,which provides a reference for zinc smelting enterprises to deal with acidic solution containing copper and arsenic.

关 键 词：湿法炼锌 含铜砷酸性溶液 铁粉置换 除铜、砷 铜渣 铜砷物质的量比 

分 类 号：TF813[冶金工程—有色金属冶金] TF803.2