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

研究成果: 会議への寄与タイプ論文

抄録

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.

元の言語英語
ページ559-572
ページ数14
出版物ステータス出版済み - 10 8 2013
イベント7th European Metallurgical Conference, EMC 2013 - Weimar, ドイツ
継続期間: 6 23 20136 26 2013

その他

その他7th European Metallurgical Conference, EMC 2013
ドイツ
Weimar
期間6/23/136/26/13

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Electrowinning
Cyclic voltammetry
Impurities
Hydrogen
Dissolution
Electrodes
Current density
Direction compound

All Science Journal Classification (ASJC) codes

  • Metals and Alloys

これを引用

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. 論文発表場所 7th European Metallurgical Conference, EMC 2013, Weimar, ドイツ.

Evaluation of harmful effects of impurities in Zn electrowinning solution using cyclic voltammetry. / Nakano, Hiroaki; Oue, Satoshi; Fukushima, Hisaaki; Kobayashi, Shigeo; Nishina, Kazuhiko; Sogabe, Nobuyoshi.

2013. 559-572 論文発表場所 7th European Metallurgical Conference, EMC 2013, Weimar, ドイツ.

研究成果: 会議への寄与タイプ論文

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' 論文発表場所 7th European Metallurgical Conference, EMC 2013, Weimar, ドイツ, 6/23/13 - 6/26/13, pp. 559-572.
Nakano H, Oue S, Fukushima H, Kobayashi S, Nishina K, Sogabe N. Evaluation of harmful effects of impurities in Zn electrowinning solution using cyclic voltammetry. 2013. 論文発表場所 7th European Metallurgical Conference, EMC 2013, Weimar, ドイツ.
Nakano, Hiroaki ; Oue, Satoshi ; Fukushima, Hisaaki ; Kobayashi, Shigeo ; Nishina, Kazuhiko ; Sogabe, Nobuyoshi. / Evaluation of harmful effects of impurities in Zn electrowinning solution using cyclic voltammetry. 論文発表場所 7th European Metallurgical Conference, EMC 2013, Weimar, ドイツ.14 p.
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N2 - 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.

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