Selective Recovery Process for Gold Utilizing a Functional Gel Derived from Natural Condensed Tannin

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著者

    • Ogata Takeshi OGATA Takeshi
    • Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Technology, Tokyo Institute of Technology
    • Kim Yeon Ho KIM Yeon Ho
    • Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Technology, Tokyo Institute of Technology
    • Nakano Yoshio NAKANO Yoshio
    • Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Technology, Tokyo Institute of Technology

抄録

A tannin gel was prepared from condensed tannin (wattle tannin), which is a ubiquitous and inexpensive natural material extracted from the leaves or barks of plants. The tannin gel has the ability to adsorb and reduce the metal ions with a redox potential higher than that of the tannin gel. The selective recovery of Au from a mixed solution of various precious metal ions (Au, Pd, Pt, and Rh) was performed using such features of the tannin gel. The predominant species of each precious metal ion are AuCl<SUB>4</SUB><SUP>–</SUP>, PdCl<SUB>4</SUB><SUP>2–</SUP>, PtCl<SUB>6</SUB><SUP>2–</SUP>, and RhCl<SUB>5</SUB><SUP>2–</SUP> at pH 1.0 and pCl 1.0. The redox potential of the AuCl<SUB>4</SUB><SUP>–</SUP>/Au couple is much higher than that of the tannin gel, while the other precious metals such as the PtCl<SUB>6</SUB><SUP>2–</SUP>/PtCl<SUB>4</SUB><SUP>2–</SUP> couple, PdCl<SUB>4</SUB><SUP>2–</SUP>/Pd couple, and RhCl<SUB>5</SUB><SUP>2–</SUP>/Rh couple have redox potentials lower than that of the tannin gel. Under the conditions of pH 1.0 and pCl 1.0, the entire amount of Au in the solution was adsorbed perfectly by the tannin gel, while the other precious metals were hardly adsorbed. The adsorbed Au was reduced to metallic Au on the tannin gel. Thus the selective adsorption and reduction of Au could be achieved by controlling the predominant ions of each precious metal ion in the solution.

収録刊行物

  • Journal of chemical engineering of Japan  

    Journal of chemical engineering of Japan 40(3), 270-274, 2007-03-01 

    The Society of Chemical Engineers, Japan

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各種コード

  • NII論文ID(NAID)
    10018902810
  • NII書誌ID(NCID)
    AA00709658
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    00219592
  • NDL 記事登録ID
    8691526
  • NDL 雑誌分類
    ZP1(科学技術--化学・化学工業)
  • NDL 請求記号
    Z53-R395
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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