Role of iron(III) and aluminum hydroxides in concentration/reduction of Au(III) complexes

Akiko Uchida, Takushi Yokoyama, Yoshinobu Motomura, Akane Miyazaki, Yoshihiro Okaue, Koichiro Watanabe, Eiji Izawa

研究成果: Contribution to journalArticle

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The adsorption of gold on iron(III) and aluminum hydroxides from solutions containing Au(III) complexes has been studied as a function of pH and chloride concentration at 30°C. Iron(III) hydroxide was more effective in adsorbing gold from solution than aluminum hydroxide. However, both hydroxides controlled the behavior of Au(III) complex with very similar manner. The most effective gold adsorption occurred in aqueous solution with near neutral pH and low Cl concentration. In this solution condition, Au(III) complexes were mainly dissolved as AuCl2(OH)2-and AuCl(OH)3-, and the surface charge for both hydroxides was positive. In addition, the adsorbed Au(III) complexes were spontaneously reduced to elemental gold in spite of the absence of a specific reducing agent. The results of this study suggest that adsorption and spontaneous reduction of gold complexes on the surface of hydrous metal oxides with positive charge play an important role in gold precipitation in subsurface environment.

元の言語英語
ページ(範囲)223-230
ページ数8
ジャーナルResource Geology
52
発行部数3
DOI
出版物ステータス出版済み - 1 1 2002

All Science Journal Classification (ASJC) codes

  • Geology
  • Geochemistry and Petrology

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