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Résumé :
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Three-liquid-phase extraction and one-step separation of platinum, palladium, and rhodium in the system composed of diisoamyl sulphide (S201), polyethylene oxide-polypropylene oxide random block copolymer (EOPO), Na2SO4, and H2O were investigated. Experimental results indicated that phase-forming salt type, salt concentrations, coexisting H+ and Cl- concentrations in equilibrious Na2SO4 aqueous solutions have significant influences on the three-liquid-phase partitioning behaviors of Pt(IV), Pd(II), and Rh(III). Under the optimized operation parameters, over 99 wt % of Pd(II), about 90 wt % of Pt(IV), and 85 wt % of Rh(III) in initial feed solutions were respectively concentrated into S201 top phase, EOPO middle phase, and Na2SO4 bottom aqueous phase. The present work explores a possibility to develop a three-liquid-phase extraction approach for one-step separation of platinum metal ions in highly concentrated acidic chloride media obtained by hydrometallurgical processes.
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