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

Zhigang Zhao, Fukiko Kubota, Noriho Kamiya, Masahiro Goto

Research output: Contribution to journalArticlepeer-review

Abstract

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 Sc<sup>3+</sup> from a sulfuric acid solution containing transition metals such as Al<sup>3+</sup>, Fe<sup>3+</sup>, Mn<sup>2+</sup>, Co<sup>2+</sup>, Ni<sup>2+</sup> and Zn<sup>2+</sup> was investigated using a β-diketone, HTTA and a neutral extractant, TOPO. Due to the synergistic effect with the two extractants, Sc<sup>3+</sup> was effectively and selectively separated even from Fe<sup>3+</sup>, the separation of which is difficult with HTTA alone. The extraction mechanism was examined and it was revealed that Sc<sup>3+</sup> 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 Sc<sup>3+</sup> in a refining process was demonstrated.
Original languageEnglish
Pages (from-to)137-143
Number of pages7
JournalSolvent Extraction Research and Development
Volume23
Issue number2
DOIs
Publication statusPublished - 2016

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