(中南大学 化学化工学院，长沙 410083)
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。
关键字: CuCl；脱氯；Cu-Cl-·-H2O体系；指示电极
（School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China）
Abstract:Based on the potential—pH diagram and potential—lga(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(Cu2+/Cu) and φ[Cu2+/CuCl(s)], respectively. The effect of Cu2+ 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 Cu2+ content is 0.15 mol/L, and the effect of chloride removal can be improved as Cu2+ content increases, but when Cu2+ content is more than 0.20 mol/L, the effect of chloride removal cannot be obviously improved any more.
Key words: cuprous chloride; chloride removal; Cu-Cl-·-H2O system; indictor electrodes
