Simultaneous ion exchange recovery of platinum and rhodium from chloride solutions

Кононова, О. Н.; Melnikov, A.M.; Борисова, Тетяна; Крылов, А. С.

doi:10.1016/j.hydromet.2010.11.009

Cited by 57 publications

(23 citation statements)

References 15 publications

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“…It should also be noted that the calculated K value in the Langmuir isotherm in Table 5 for the adsorption of Pt on Purolite S985 compares reasonably well with previously published data (Kononova et al, 2011;2013) In the case of Lewatit M+ MP 600, the calculated b values in the Freundlich isotherm in Table 6 for the adsorption of Pt and Pd on the resin fall between values of 0 to 1, indicating favourable adsorption of Pt and Pd on Lewatit M+ MP 600. This is also implied by the K R values in Table 5.…”

supporting

confidence: 88%

“…In other words, this resin will only be selective for Pd given a sufficiently high concentration of Pd in the solution. Such phenomenon of enhanced affinity of the anion exchanger for traces of exchanged PGE ions was also observed by Kononova et al (2011), whereby convex segments of the isotherms were reported.…”

Section: Figure 3 Adsorption Isotherms Of Pd From Process Leach Solusupporting

confidence: 59%

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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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supporting

confidence: 88%

Section: Figure 3 Adsorption Isotherms Of Pd From Process Leach Solusupporting

confidence: 59%

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

2015

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“…Given the quantities of Rh and Ru extracted, and the possibility of these quantities increasing over longer leaching times, there is good reason to investigate the recovery of the Rh and Ru before or after BM recovery. Current technology and research is focusing on the use of ion exchange, precipitation and solvent extraction to recover Rh and Ru from chloride and nitrate media (Kononova et al, 2011;Els et al, 2000;Bernardis et al, 2005;Seymour and O'Farrelly, 2001). The use of these methods as a means of recovery from a sulphate media is also a possibility.…”

Section: Figure 3: Ph-redox Potential Profilementioning

confidence: 99%

A conceptual flowsheet for heap leaching of platinum group metals (PGMs) from a low-grade ore concentrate

Mwase

Petersen

Eksteen³

2012

Hydrometallurgy

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This research proposes a new conceptual process to economically extract platinum group metals (PGMs), and as a secondary aim, base metals (BMs) from a low-grade concentrate originating from typical PGM concentrator plants. Slurry made from the concentrate was coated onto granite pebbles and packed into a column, in which it was bioleached with a mixed culture of thermophiles and mesophiles at 65°C. After 30 days the extractions achieved were 52 % copper, 95 % nickel and 85 % cobalt. The residual concentrate material was subsequently subjected to a cyanide leach also in a packed column operating at a room temperature of 23°C. After 21 days 20.3 % Pt, 87 % Pd and 46 % Rh were extracted. Using these results and projected extractions over longer operating times, a conceptual flowsheet was proposed for a possible process route to recover PGM values circumventing the problematic smelter route for this material.

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“…Given that Rh and Ru are soluble in this acidic solution their extraction is unavoidable. However, considering the quantities extracted, recovery via methods such as solvent extraction, ion exchange and precipitation (Kononova et al, 2011;Bernardis et al, 2005;Seymour & O'Farrelly, 2001;Els et al, 2000) from the leach liquor should be evaluated. MLA and XRD analyses were conducted on a sub-sample from column 2; it was assumed that the splitting process to generate the samples for the bioleach experiment resulted in representative samples with similar bulk and PGM mineralogy.…”

Section: High Temperature Bioleachmentioning

confidence: 99%

Assessing a two-stage heap leaching process for Platreef flotation concentrate

2012

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Samples of low-grade flotation concentrate derived from Platreef ore were treated with a two-stage heap leach process to determine the potential to run this process parallel to to the convential concentrate-smelt-refine process for extracting platinum group metals, thereby adding value to the convential process via economic treatment of low-grade materials. Using bench-scale columns, a first stage bioleach achieved extractions of 91.1% Cu, 98.5% Ni and 83.5% Co in a space of 88 days at a temperature of 65°C. Samples of residual concentrate from this process were similarly treated via columns in a second stage leach using cyanide solution, achieving extractions of up to 96.5% Pd, 97.5% Au and 35% Pt in a space of 45 days at 50°C. Mineral liberation analysis of a sample of concentrate from the cyanide leach experiment revealed that the bulk of the remaining Pt was in the form of sperrylite which appeared to leach very slowly in cyanide solution. Further to this, analysis of the cyanide leachate solution showed high levels of thiocyanate

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Simultaneous ion exchange recovery of platinum and rhodium from chloride solutions

Cited by 57 publications

References 15 publications

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

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

A conceptual flowsheet for heap leaching of platinum group metals (PGMs) from a low-grade ore concentrate

Assessing a two-stage heap leaching process for Platreef flotation concentrate

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