表面技術
Online ISSN : 1884-3409
Print ISSN : 0915-1869
ISSN-L : 0915-1869
73 巻, 2 号
選択された号の論文の2件中1~2を表示しています
研究論文
  • 髙島 憂美, 松本 歩, 岩井 優奈, 有田 翔太郎, 八重 真治
    2022 年 73 巻 2 号 p. 98-102
    発行日: 2022/02/01
    公開日: 2022/02/05
    ジャーナル フリー

    For securing noble metal resources, recovery of noble metals from urban mines is a key technology. Recently, ammonium thiosulfate solution has attracted attention as a safe and low-cost solution for gold leaching. We previously reported a noble metal recovery process using electroless displacement deposition onto silicon powder. In this study, we tried to use silicon powder to recover gold from an ammonium thiosulfate leaching solution. For experimentation, we added silicon powder to a simulated ammonium thiosulfate leaching solution containing 1 mM(M: mol dm-3)sodium gold(I)sulfite and copper(II)sulfate(oxidizing agent for gold dissolution). In the cases that the copper(II)sulfate concentration was 5 mM or higher, gold was not recovered even after 24 h treatment. However, we recovered gold successfully in 3 h by decreasing the copper(II)sulfate concentration to 2 mM or less. We also recovered gold in 3 h by changing the pH from 10 to 13 of the solution containing 5 mM copper(II)sulfate.

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