焙烧酸浸渣中铜的形态对铜、金浸出率的影响  

Influence of copper morphology on copper and gold leaching rates in calcine and acid leaching residue

作　　者：杨玮[1] 曹欢 张凯 王刚[1] Wei YANG;Huan CAO;Kai ZHANG;Gang WANG(College of Materials and Mineral Resources,Xi'an University of Architecture and Technology,Key Laboratory of Gold and Resource of Shaanxi Province,Xi'an,Shaanxi 710055,China)

机构地区：[1]西安建筑科技大学材料与矿资学院陕西省黄金与资源重点实验室

出　　处：《过程工程学报》2018年第6期1226-1231,共6页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金资助项目(编号:51474169);陕西省工业科技攻关项目(编号:2016GY-154)

摘　　要：以某黄金冶炼厂含铜金精矿为研究对象,采用铜化学物相分析及浸出方法研究了焙烧-酸浸-氰化工艺处理含铜金精矿过程中焙烧酸浸渣中铜形态对铜、金浸出率的影响.结果表明,含铜金精矿焙烧酸浸及氰化浸出时,铜形态对铜、金浸出率有显著影响,当酸浸渣中氰化易溶铜(氧化铜、次生硫化铜)含量大于0.10%时,金浸出率降低.以原生硫化铜矿为主的含铜金精矿,适当提高焙烧温度、延长焙烧时间、增加初始酸浸酸度可有效降低酸浸渣中氰化易溶铜含量,提高铜浸出率,减弱其对金浸出率的影响.Taking gold-copper concentrate of a certain gold smelting plant as the research object determined changing situation of distribution of copper oxide,secondary sulfide copper and primary sulfide copper in calcine and acid leaching residue at different roasting temperature,roasting time and initial acid concentration of acid leaching; researched influence of copper morphology on copper and gold leaching rates in calcine and acid leaching residue with way of leaching.And ascertained the measures to improve the copper leaching rate of the gold-copper concentrate. The results showed that the morphology of copper had a significant influence on copper and gold leaching rate when gold-copper concentrate was treated by roasting-acid leaching--cyanidation process.When the content of cyanide soluble copper (copper oxide and secondary sulfide copper)in acid leaching residue was beyond 0.10%,the gold leaching rate was reduced.The gold-copper concentrate bearing mainly primary sulfide copper mine obtained a good indicator in the roasting temperature 690℃,roasting time 1.5h,initial acid concentration of acid leaching 35g/L, quality of leaching liquid-solid ratio 3:1,leaching time 1h,leaching temperature 85℃,initial concentration of NaCN 1.0-1.2g/L,leaching time 24h,pH of system 10~11,mass ratio of leaching liquid to solid 2:1.The copper leaching rate reached 95.40%,and gold leaching rate was up to 97.33%.The measures to improve the copper leaching rate of the gold--copper concentrate are increasing roasting temperature from 650~C to 690"C,extending the roasting time from 1.0h to 1.5h and increasing initial acid concentration of acid leaching from 30g/L to 35g/L.Gold-copper concentrate bearing mainly primary sulfide copper mine can effectively reduce cyanide soluble copper content in the acid leaching residue by increasing roasting temperature,extending the roasting time and increasing initial acid concentration of acid leaching.These measures improved the leaching rate of copper meanwhile reduced the impact on gold leaching

关 键 词：含铜金精矿 铜形态 酸浸渣 浸出率 

分 类 号：TF831[冶金工程—有色金属冶金]