(中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083)
摘 要: 根據(jù)Cu-Cl-·-H2O多相體系的φ—pH圖和φ—lga(Cl-)圖，采用CuCl沉淀法脫去硫酸鋅浸出液中的雜質(zhì)Cl-，在加鋅粉過程中，分別采用銅絲電極和鉑片電極為指示電極連續(xù)測定φ (Cu2+/Cu)與φ[Cu2+/CuCl(s)]，并討論了浸出液中Cu2+含量對(duì)除氯的影響。結(jié)果表明：當(dāng)φ(Cu2+/Cu)與φ[Cu2+/CuCl(s)]首次相等時(shí)，體系中金屬銅、Cu2+和固態(tài)CuCl建立三相平衡，此時(shí)除氯效果最佳；除氯效果隨Cu2+含量的增加而提高；Cu2+含量大于0.15 mol/L才能達(dá)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，除氯效果沒有明顯提高。
關(guān)鍵字: CuCl；脫氯；Cu-Cl-·-H2O體系；指示電極
（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
