Solvent Extraction Research and Development, Japan
Online ISSN : 2188-4765
Print ISSN : 1341-7215
ISSN-L : 1341-7215
Original Articles
Extraction Behavior of Precious Metals in Hydrochloric-acid Media Using a Novel Amine Extractant Bearing a Furan Group
Tatsuya OSHIMASeishiro IWAONaoki MATSUOKaoru OHE
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2019 Volume 26 Issue 2 Pages 69-80


Amine extractants are effective for extracting precious metals in hydrochloric-acid media. We developed a novel secondary-amine extractant 2-ethylhexylfurfurylamine (EH-A-F). EH-A-F showed a higher Pd(II) extractability compared with many secondary-amine compounds, such as di(2-ethylhexyl)amine. Because the Pd(II) extraction from solutions of lower hydrochloric-acid concentration is small, Pd(II) and Au(III) can be extracted selectively from the trivalent metal ions Fe(III), Ga(III), and In(III). Because the extractability of hydrochloric acid using EH-A-F was lower than that of a competitive amine compound, benzyl 2- ethylhexylamine, EH-A-F was found to show a higher Pd(II) extractability because of its moderate basicity. Slope analysis for Pd(II) extraction showed that the complex stoichiometry was 2:1 for EH-A-F and Pd(II). The Pd(II) extracted by using EH-A-F was stripped quantitatively by using aqueous thiourea solution.

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© 2019 Japan Association of Solvent Extraction
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