中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 19 No. 2 April 2009 |
(School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China)
Abstract: The effects of Na+ and Ca2+ in the purified water on the conductivity of zinc electrolyte and the current efficiency of zinc electrolysis were studied by the alternating current bridge method and the simulated electrolysis experiments, and the water quality index of reused water was established. The results show that the conductivity of the solution and the current efficiency decrease as these two kinds of positive ions are added in the electrolyte. The effect of Ca2+ is much more remarkable than that of Na+. ρ(Na+)≤ 8 g/L and ρ(Ca2+)≤20 mg/L are the quality indexes in the zinc electrolysis process and the concentrations of Na+ and Ca2+ in the purified water reused to the process should be less than the limited values, i.e. the water quality index of the purified water should be controlled by its reused amount.
Key words: water quality index; purified water; zinc electrolysis process; alternating current bridge method