NH_3-NH_4Cl-H_2O体系浸出低品位氧化锌矿制取电锌  

Leaching of Low Grade Zinc Oxide Ore in NH_3-NH_4Cl-H_2O System for Production of Electrolytic Zinc

作　　者：王瑞祥[1] 唐谟堂[1] 刘维[1] 杨声海[1] 张文海[1] 

机构地区：[1]中南大学冶金科学与工程学院

出　　处：《过程工程学报》2008年第S1期219-222,共4页The Chinese Journal of Process Engineering

基　　金：国家自然科学基金(编号:50674104);国家重点基础研究发展规划(973)基金(编号:2007CB613604)

摘　　要：对NH_3-NH_4Cl-H_2O体系采用浸出法直接从低品位氧化锌矿提取锌,锌以锌氨配合物形式进入浸出液,浸出液中的As,Sb,Fe,SO_4^(2-)和CO_3^(2-)等杂质通过净化脱除.在最优浸出条件下,锌浸出率为88.9%;浸出液中As,Sb,Fe浓度可降至0.25 mg/L;CaCl_2,BaCl_2可将CO_3^(2-)和SO_4^(2-)几乎除尽,其他杂质元素含量也极低,浸出液经锌粉1次净化除杂后进行电积制取电锌.电锌中Zn的质量分数达99.999%,杂质含量极低,其中Fe的质量分数仅为0.00005%;电流效率高达96.35%,直流电耗为2502kW·h;电解废液经补充氨后返回浸出.The leaching-elcetrowinning process in the NH_3-NH_4Cl-H_2O system has been proposed for treatment of low grade zinc oxide ore in this paper.Zinc in oxide ore was leached into solution in the form of Zn(NH_3)_i^(2+),and the impurities of As,Sb,Fe,SO_4^(2-)and CO_3^(2-)in leaching solution were removed in the sequent purification stage.Under the optimum conditions,the leaching rate of zinc reached 88.9%.The content of As,Sb and Fe in leaching solution was less than 0.25 mg/L,respectively,and CO_3^(2-)and SO_...

关 键 词：NH_3-NH_4Cl-H_2O体系 低品位氧化锌矿 浸出 净化 电积 

分 类 号：TF813[冶金工程—有色金属冶金]