Impurity Deposition on Starting Sheet in Copper Electrorefining.

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  • ANDO Koji
    Niihama Research Laboratories, Sumitomo Metal Mining Co., Ltd., Niihama-shi 792-0002, Japan
  • SUGIMOTO Makoto
    Nippon Catalyst Cycle Co., Ltd.

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Other Title
  • 銅種板電解における不純物の析出抑制
  • ドウ タネイタ デンカイ ニ オケル フジュンブツ ノ セキシュツ ヨクセイ

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Abstract

In processing starting sheets for copper electrorefining, the stainless steel cathodes are commonly replaced in one-day period to strip off the starting sheets. Half of the cathodes in cell are replaced without power cut, then, the cathode current density rises twice during the replacement. This operation sometimes results in the formation of gloss parts on a surface of the starting sheet, resulted from the deposition of some impurities such as bismuth. The cause and mechanism of the bismuth deposition were studied by the experiments using a plant cell, and measures for avoiding the deposition was discussed in this paper.<BR>It was found that the content of bismuth deposited even in a short period of the electrolysis is so high as to give a serious effect to the quality of produced electrolytic copper and that the deposition is influenced by the current density and the electrolyte. To prevent the deposition of bismuth,the current distribution on the cathodes is to be uniform and the electrolyte is to be controlled for decreaseing the polarization. It was also found effective to replace the cathodes after they are covered with the deposited copper.

Journal

  • Shigen-to-Sozai

    Shigen-to-Sozai 117 (11), 885-890, 2001

    The Mining and Materials Processing Institute of Japan

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