Evaluation of harmful effects of impurities in Zn electrowinning solution using cyclic voltammetry

Hiroaki Nakano, Satoshi Oue, Hisaaki Fukushima, Shigeo Kobayashi, Kazuhiko Nishina, Nobuyoshi Sogabe

Research output: Contribution to conferencePaper

Abstract

In this study, the harmful effects of impurities in Zn electrowinning solution was evaluated using cyclic voltammetry. The voltammograms obtained from solutions containing Cu, Ni, and Sb as impurities showed a shift in potential for hydrogen evolution to the more noble direction and an increase in critical current density for Zn deposition. When the potential of the working electrode was reverted to the more noble direction after Zn deposition, the deposited Zn was found to dissolve. The potential required for initiating the dissolution of Zn was slightly more noble in solutions containing Cu and Ni than that in impurity-free solutions. In solutions containing Cu and Ni, the further shift in potential to the more noble direction after dissolution of Zn caused an abrupt shift in current density toward the reduction side for hydrogen evolution. This is attributed to the deposition of Cu and Ni with lower hydrogen overpotential on the electrode, which determines if the occurrence of impurity deposition is indicated by the voltammogram. Thus, the harmful effects of impurities on the electrowinning of Zn can be evaluated using cyclic voltammetry.

Original languageEnglish
Pages559-572
Number of pages14
Publication statusPublished - Oct 8 2013
Event7th European Metallurgical Conference, EMC 2013 - Weimar, Germany
Duration: Jun 23 2013Jun 26 2013

Other

Other7th European Metallurgical Conference, EMC 2013
CountryGermany
CityWeimar
Period6/23/136/26/13

All Science Journal Classification (ASJC) codes

  • Metals and Alloys

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    Nakano, H., Oue, S., Fukushima, H., Kobayashi, S., Nishina, K., & Sogabe, N. (2013). Evaluation of harmful effects of impurities in Zn electrowinning solution using cyclic voltammetry. 559-572. Paper presented at 7th European Metallurgical Conference, EMC 2013, Weimar, Germany.