电极指示法在硫酸锌浸出液脱氯反应中的应用  

Application of indicator electrodes in chloride removal from ZnSO_4 leachate

作　　者：王松森[1] 李元高[1] 曾孟祥[1] 陶涛[1] 张平民[1] 

机构地区：[1]中南大学化学化工学院,长沙410083

出　　处：《中国有色金属学报》2007年第8期1379-1384,共6页The Chinese Journal of Nonferrous Metals

摘　　要：根据Cu-Cl--H2O多相体系的φ—pH图和φ—lga(Cl-)图,采用CuCl沉淀法脱去硫酸锌浸出液中的杂质Cl-,在加锌粉过程中,分别采用铜丝电极和铂片电极为指示电极连续测定φ(Cu2+/Cu)与φ[Cu2+/CuCl(s)],并讨论了浸出液中Cu2+含量对除氯的影响。结果表明:当φ(Cu2+/Cu)与φ[Cu2+/CuCl(s)]首次相等时,体系中金属铜、Cu2+和固态CuCl建立三相平衡,此时除氯效果最佳;除氯效果随Cu2+含量的增加而提高;Cu2+含量大于0.15 mol/L才能达到除氯要求(Cl-含量小于300 mg/L);Cu2+含量增加到0.20 mol/L以后,除氯效果没有明显提高。Based on the potential-pH diagram and potential-lgα（Cl^-） diagram of Cu-Cl^--H2O multiphase system, in the chloride removal process by cuprous chloride precipitation copper indictor electrode and platinum indictor electrode were used to continually monitor the φ（Cu^2＋/Cu） and φ[Cu^2＋/CuCl（s）], respectively. The effect of Cu^2＋ content on the chloride removal effect was researched. The results show that when the two potentials intersect at the same point for the first time, which means that the equilibrium is established at the triple point, the effect of optimum chloride removal can be gained. The final Cl^- content can be decreased to 300 mg/L when Cu^2＋ content is 0.15 mol/L, and the effect of chloride removal can be improved as Cu^2＋ content increases, but when Cu^2＋ content is more than 0.20 mol/L, the effect of chloride removal cannot be obviously improved any more.

关 键 词：CUCL 脱氯 Cu-Cl^--H2O体系 指示电极 

分 类 号：O646.2[理学—物理化学]