亜鉛電解採取における電析亜鉛の再溶解挙動に及ぼす不純物の相乗作用

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  • Synergistic Effect of Impurities on the Dissolution Behavior of Zn Electrodeposited from Electrowinning Solutions
  • アエン デンカイ サイシュ ニ オケル デンセキ アエン ノ サイヨウカイ キョドウ ニ オヨボス フジュンブツ ノ ソウジョウ サヨウ

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The synergistic effect of impurities on the dissolution behavior of Zn electrodeposited from the electrowinning solutions containing a different combination of impurities has been investigated by measuring the time-dependence of cathode potential during electrolysis and the polarization curves in the solutions. The impurities are classified into four groups ; group I (Ag, Cu, Cd) which changes inherent hydrogen overpotential η0H by depositing at limiting current density; group II (Ni, Co, Fe) which reduces η0H by partially depositing at lower current densities than limiting one ; group III (As, Sb, Ge) which catalytically reduces η0H ; and group IV (Al, Pb) which causes no change in η0H. In the solution containing both iron-group metal of group II and Cu of group I or Sb of group III as impurity, the dissolution of deposited Zn was more likely to occur than in the solution containing each impurity alone. Cu and Sb increase the kinetically suppressed deposition rate of iron-group metals, resulting in the increase in the critical current density for Zn deposition. The occurrence of dissolution of deposited Zn was closely related to the increase in critical current density for Zn deposition. Although the cycle of deposition and dissolution of Zn was repeated in the solution containing iron-group metal alone, no Zn deposited again after the dissolution occurred in the solution containing iron-group metal and Cu or Sb. This is ascribed to cathode surface replaced by Cu and iron-group metal during dissolution of Zn.

収録刊行物

  • 資源と素材

    資源と素材 124 (3), 179-183, 2008

    一般社団法人 資源・素材学会

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