Extraction and stripping behavior of platinum group metals using amic-acid-type extractants

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  • Yoshida Wataru
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University
  • Baba Yuzo
    Department of Applied Chemistry, Graduate School of Science and Technology, Tokushima University
  • Kubota Fukiko
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University
  • Kamiya Noriho
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University Center for Future Chemistry, Kyushu University
  • Goto Masahiro
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu University Center for Future Chemistry, Kyushu University

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  • Extraction and Stripping Behavior of Platinum Group Metals Using an Amic-Acid-Type Extractant

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<p>The recovery and separation of platinum group metals (PGMs) are of considerable significance for metal sustainability. To establish an efficient extraction process for PGMs, the novel extractant N-[N,N-di(2-ethylhexyl)aminocarbonylmethyl]phenylalanine (D2EHAF), containing a phenylalanine moiety as the metal-affinity group, was synthesized. The extraction of PGMs from aqueous HCl and HNO3 solutions with D2EHAF, or our previously developed N-[N,N-di(2-ethylhexyl)aminocarbonylmethyl]glycine (D2EHAG), in n-dodecane was investigated. Both D2EHAF and D2EHAG exhibited high extraction affinities for Os4+, Pt4+, and Pd2+ in aqueous HCl. In a HNO3 solution, D2EHAF extracted Pd2+ more efficiently than D2EHAG, and the extraction of Pd2+ from a 1 mol dm−3 HNO3 solution with D2EHAF proceeded quantitatively. The extracted metal ions were stripped from the organic solution using a highly acidic solution, or thiourea.</p>

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