Sorption recovery of platinum(II, IV) from chloride and sulfate-chloride solutions

Melnikov, A.M.; Кононова, О. Н.; Ozerova, T. A.; Lukyanenko, Alexander

doi:10.1134/s1070427212100138

Cited by 5 publications

(4 citation statements)

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“…The strongly basic anion exchanger Lewatit M+ MP 600 exhibited a high sorption affinity to Pt, as seen in the sorption recovery of Pt from both process leach solution and synthetic solution. This is consistent with the observations by Kononova et al (2010c) and Mel'nikov et al (2012b) who tested a heterodisperse version of this ion exchanger. On the other hand, the sorption recovery of Rh from both synthetic solution and process leach solution was markedly unfavourable, which was also observed by Kononova et al (2009).…”

Section: Methods Used To Determine Rate Of Desorptionsupporting

confidence: 81%

“…This suggests that the acidity of the contacting solution may have some detrimental effects towards the sorption recovery of Pt and Pd. The effect of acidity of the contacting solution towards the sorption ability of Purolite S985 has also been reported by Kononova et al (2013;Mel'nikov et al (2012b). The possible reason for such behaviour of the weak base resin is included in the latter section of this paper.…”

Section: Accepted M Manuscriptmentioning

confidence: 77%

“…11 should be noted that this is unlikely to be due to the effect of the acidity of the contacting solution (Kononova et al, 2009;2010c;Mel'nikov et al, 2012b) which is explained further in the latter section of this paper.…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…On the other hand, Lewatit M+ MP 600 which is a strong basic exchanger, has no complexation ability since its quaternary ammonia base functional group maintains equal adsorption ability in a broad range of pH values, in contrast to weak and intermediate basic anion exchangers (Kononova et al, 2010c(Kononova et al, , 2011Mel'nikov et al, 2012b). The adsorption ability of this resin for Pt and Pd is therefore not greatly affected by the low pH of the contacting medium, but more likely to be affected by the competing effect of the high chloride concentration in the strong acidic media, as illustrated by the following reaction scheme:…”

Section: Adsorption Selectivitymentioning

confidence: 99%

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Recovery of platinum, palladium and rhodium from acidic chloride leach solution using ion exchange resins

2015

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ÔØ Å ÒÙ× Ö ÔØRecovery of platinum, palladium and rhodium from acidic chloride leach solution using ion exchange resins This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A C C E P T E D M A N U S C R I P T ACCEPTED MANUSCRIPT AbstractThe objective of this study was to investigate the applicability and performance of the selected ion exchangers with different physicochemical characteristics and functional groups to simultaneously recover three different platinum group elements (PGE), platinum(IV), palladium(II) and rhodium(III), present in a chloride solution produced by the leaching of spent automotive catalysts. The tested ion exchangers included a resin with a quaternary ammonium functional group (Lewatit MonoPlus (M+) MP 600), a resin with a polyamine functional group (Purolite S985) and a resin with a thiouronium functional group (XUS 43600.00). The study also focused on the achievable desorption from the loaded resins using different eluent systems. The leach solution was chlorine-saturated and contained 2.35 mol/L hydrochloric acid, platinum and palladium in concentrations of 0.13 mmol/L, and rhodium 0.03 mmol/L. It was found that XUS 43600.00 showed the best adsorption performance for platinum(IV) and palladium(II) chloride complexes among the investigated resins, but weak affinity for rhodium(III) chloride complexes was observed for all three resins. The adsorption kinetics were found to obey the Ho pseudo-second order expression. For Lewatit MonoPlus (M+) MP 600 and Purolite S985 the adsorption was best described by the Freundlich isotherm, while for XUS 43600.00 the Langmuir isotherm was more apt. Desorption of the PGE was examined using four different elution agents: sodium thiocyanate (2 mol/L); hydrochloric acid (2 mol/L); thiourea (1 mol/L) in hydrochloric acid (2 mol/L); and thiourea(1 mol/L) in sodium hydroxide (2 mol/L). The results showed that platinum and palladium can be fully eluted with the acidic thiourea but desorption of rhodium proved difficult with all the eluents.

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Section: Methods Used To Determine Rate Of Desorptionsupporting

confidence: 81%

Section: Accepted M Manuscriptmentioning

confidence: 77%