Extraction of Gold(III) from Acidic Chloride Media Using Phosphonium-based Ionic Liquid as an Anion Exchanger

The present work addresses Au­(III) extraction from chloride media using phosphonium-based ionic liquid (Cyphos IL 109) as a novel anion exchanger diluted in xylene. Gold­(III) is extracted into the organic phase as [P66614 +]­[AuCl4 – ] and can easily be stripped by reduction to Au­(I) with CS­(NH2...

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Bibliographic Details
Published in:Industrial & engineering chemistry research 2015-02, Vol.54 (4), p.1350-1358
Main Authors: Nguyen, Viet Tu, Lee, Jae-chun, Jeong, Jinki, Kim, Byung-Su, Cote, Gérard, Chagnes, Alexandre
Format: Article
Language:English
Subjects:
Anion exchanging
Chlorides
Extraction
Ion exchangers
Ionic liquids
Media
Pilots
Stripping
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Summary:The present work addresses Au­(III) extraction from chloride media using phosphonium-based ionic liquid (Cyphos IL 109) as a novel anion exchanger diluted in xylene. Gold­(III) is extracted into the organic phase as [P66614 +]­[AuCl4 – ] and can easily be stripped by reduction to Au­(I) with CS­(NH2)2/HCl or Na2S2O3. A series of extraction-stripping cycles show a possible recirculation of used solvent without loss of performance, as far as the extraction of gold­(III) from HCl/Cl– media is concerned. Au­(III) was quantitatively (99.4%) extracted from 0.1 mol L–1 HCl initially containing 100 mg L–1 Au­(III) with 0.8 g L–1 Cyphos IL 109 with two counter-current stages at O/A = 1, whereas total stripping as Au­(I) with 0.02 mol L–1 CS­(NH2)2 in 5% HCl or 0.02 mol L–1 Na2S2O3 also needed two counter-current stages, at O/A = 3. Simulations of counter-current modes reveal Cyphos IL 109 can be considered a promising new extractant for complete recovery of Au­(III) from Cl– media in pilot scale.
ISSN:0888-5885
1520-5045
DOI:10.1021/ie5045742