铜锰渣酸浸及选择性硫化沉淀法回收铜工艺  

Recovery of copper from copper manganese residue by acid leaching and selective sulfide precipitation

作　　者：邬建辉 陈小松 谌思磊 王翊民 严润 WU Jianhui;CHEN Xiaosong;CHEN Silei;WANG Yimin;YAN Run(School of Metallurgy and Environment,Central South University,Changsha 410083,China)

机构地区：[1]中南大学冶金与环境学院,长沙410083

出　　处：《有色金属科学与工程》2021年第3期70-76,共7页Nonferrous Metals Science and Engineering

摘　　要：系统开展了铜锰渣的H2SO4浸出及酸浸液Na2S2O3选择性沉铜研究,通过单因素实验,分别探究了2个工艺过程的影响因素。实验结果表明:铜锰渣酸浸的较优条件为:H_(2)SO_(4)用量200 g/L,液固体积质量比(mL/g)7∶1,反应温度80℃,反应时间2 h,该条件下铜、钴、锌、锰的浸出率分别为99.81%,99.54%,99.07%,24.10%,浸出渣主要物相为MnO2。酸浸液选择性硫化沉铜的较优条件为Na2S2O3用量倍数2.0,反应时间90 min,反应温度70℃,该条件下铜、钴、锌、锰的沉淀率分别为99.99%,0.26%,0.34%,0.29%,沉铜渣主要物相为CuS。经过上述工艺过程,铜的回收率达到99.80%,浸出渣和沉铜渣可直接用于工业生产,沉铜后液可继续分离锌、钴等金属元素。In this paper,a systematic study of H2SO4 leaching of copper manganese slag and Na2S2O3 selective copper precipitation in acid leaching solution was conducted.The influencing factors of these two processes were explored by single factor experiment.The results showed that the optimal conditions for sulfuric acid leaching of copper manganese slag were H_(2)SO_(4) dosage of 200 g/L,liquid to solid of(mL/g)7∶1,reaction temperature of 80℃and reaction time of 2 h.Under these conditions,the leaching rates of copper,cobalt,zinc and manganese were 99.81%,99.54%,99.07%and 24.10%respectively,and the main phase of leaching residue was MnO2.The optimal conditions for selective copper precipitation in acid leaching solution were Na2S2O3 dosage multiple of 2.0 and reaction time of 90 min,reaction temperature of 70℃.The results indicated that the precipitation rates of copper,cobalt,zinc and manganese were 99.99%,0.26%,0.34%and 0.29%respectively,and the main phase of copper slag was CuS.After the above process,the recovery efficiency of copper could reach 99.80%.The leaching residue and copper precipitation residue could be directly used in industrial production,and the liquid after copper precipitation could continue to separate zinc,cobalt and other metal elements.

关 键 词：铜锰渣 浸出 硫化沉淀法 选择性沉淀 硫酸 硫代硫酸钠 铜 

分 类 号：TF803.2[冶金工程—有色金属冶金]