【作者】 王瑞祥； 唐谟堂； 刘维； 杨声海； 张文海；

【Author】 WANG Rui-xiang~(1,2) TANG Mo-tang~1 LIU Wei~1 YANG Sheng-hai~1 ZHAGN Wen-hai~1 1.School of Metallurgy Science and Engineering,Central South University,Changsha,Hunan 410083,China; 2.School of Materials and Chemical Engineering,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China

【机构】 中南大学冶金科学与工程学院； 江西理工大学材料与化学工程学院；

【摘要】 对 NH₃-NH₄-NH₄Cl-H₂O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,SO₄^2-和 CO₃^2-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:CaCl₂,BaCl₂可将 CO₃^2-和 SO₄^2-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2502 kW·h:电解废液经补充氨后返回浸出.更多还原

【Abstract】 The leaching-elcetrowinning process in the NH₃-NH₄Cl-H₂O 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（NH₃）i²⁺,and the impurities of As,Sb,Fe,SO₄^2- and CO₃^2- 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 CO₃^2- and SO₄²¹ could be removed completely with the addition of BaCl₂ and CaCl₂.After cementation with zinc powder,the elecrtowinning of zinc was carried out in the NH₃-NH₄Cl-H₂O system.The content of Zn in deposited zinc strip was higher than 99.999%.The current efficiency was 96.35%,and electricity consumption was 2502 kW·h/t.Ammonia was added into the spent electrolyte,which would be recycled back to leaching stage.更多还原