Selective Extraction of Scandium from Transition Metals by Synergistic Extraction with 2-Thenoyltrifluoroacetone and Tri-n-octylphosphine Oxide

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  • ZHAO Zhigang
    Department of Applied Chemistry, Graduate School of Engineering, Kyushu 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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  • Selective Extraction of Scandium from Transition Metals by Synergistic Extraction with 2-Thenoyltrifluoroacetone and Tri-<i>n</i>-octylphosphine Oxide

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There has been an increasing demand for scandium (Sc). However the supply is insufficient because the separation and recovery of Sc as a byproduct from ores is difficult. In this study, extraction and separation of Sc3+ from a sulfuric acid solution containing transition metals such as Al3+, Fe3+, Mn2+, Co2+, Ni2+ and Zn2+ was investigated using a β-diketone, HTTA and a neutral extractant, TOPO. Due to the synergistic effect with the two extractants, Sc3+ was effectively and selectively separated even from Fe3+, the separation of which is difficult with HTTA alone. The extraction mechanism was examined and it was revealed that Sc3+ is extracted with three HTTA and one TOPO molecules. Scandium was readily stripped from the extracting phase by 1 M sulfuric acid. The potential use of the combination of the β-diketone with TOPO for the recovery of Sc3+ in a refining process was demonstrated.

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