Effect of impurities in recycling water on Pb-Ag anode passivation in zinc electrowinning process  

回用水中杂质离子对锌电解过程中Pb-Ag阳极钝化的影响(英文)

作　　者：刘恢[1] 王云燕[1] 柴立元[1] 肖海娟[1,2] 裴斐[1] 舒余德[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083 [2]中冶集团中冶长天国际工程有限责任公司,长沙410008

出　　处：《Transactions of Nonferrous Metals Society of China》2011年第7期1665-1672,共8页中国有色金属学报（英文版）

基　　金：Project(50925417) supported by China National Funds for Distinguished Young Scientists;Project(50830301) supported by the National Natural Science Foundation of China; Project(08JJ3020) supported by the Natural Science Foundation of Hunan Province,China;Project(2008SK2007) supported Key Program of Science and Technology of Hunan Province,China;Porject(2009ZX07212-001-01) supported by Key Project for Water Pollution Control and Management Technology of China

摘　　要：Effect of impurities in recycling water on Pb-Ag anode passivation in zinc electrowinning process was investigated by linear scan voltammetry.Results show that passivation process would be affected in the presence of Cl^-and F-in recycling water.It was highly advantageous to take H2SO4 concentration as 180g/L,Mn^2＋ concentration as 3-5 g/L and F-less than 42mg/L.However,passivation process would not be affected when Cl^-concentration was less than 13mg/L without any other ions,or when mass ratio of Mn^2＋ to Cl^-existing in electrolyte was 8,where Cl^-concentration could reach up to 625mg/L.采用线性扫描伏安法研究了回用水中杂质离子对锌电解过程中Pb-Ag阳极钝化的影响。结果表明:回用水中Cl-和F-的存在将会影响电极的钝化过程。当溶液中H2SO4浓度为180g/L,即酸锌比为3.6,Mn2+浓度为3～5g/L,F-浓度小于42mg/L时有利于Pb-Ag阳极钝化;而当溶液中只存在Cl-时,Cl-浓度必须低于13mg/L才不会影响电极的钝化过程;当溶液中同时存在Mn2+和Cl-且锰氯质量比为8时,电极的钝化过程不会受到Cl-的影响,此时溶液中Cl-的含量最高,可以达到625mg/L。

关 键 词：zinc electrowinning process Pb-Ag anode PASSIVATION IMPURITIES recycling water 

分 类 号：O646.54[理学—物理化学]