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Angelidis, Thomas

doi:10.1023/a:1016641906103

Cited by 55 publications

(33 citation statements)

References 5 publications

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“…In general, addition of H 2 O 2 more than 1 vol% does not increase the PGM dissolution. This result also confirms that NaClO might also take the role of oxidizing agent, as shown in reaction (7) and (8). ).…”

Section: Resultssupporting

confidence: 85%

Leaching of Pt, Pd and Rh from Automotive Catalyst Residue in Various Chloride Based Solutions

et al. 2006

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Platinum-group metals (PGM) are important precious metals in many industrial fields. However, their natural resource deposits are strictly limited. Accordingly, their recycling process from wastes and/or secondary resources must be considered. In this study, the leaching of PGM from automotive catalyst residue was performed based on the formation of their chloro-complexes in various concentration of acidic solution. The recovery of platinum, palladium and rhodium from the samples after hydrogen reduction pretreatments was examined in the leaching process by using a mild solution mixture of NaClO-HCl and H 2 O 2 at 65 C for 3 h. Effect of other solution mixtures on the extraction of the precious metals was also compared with NaClO-HCl-H 2 O 2 , such as HCl-H 2 O 2 and NaClO-HCl. The optimum condition to dissolve platinum, palladium and rhodium was achieved by the mixture of 3 vol% NaClO, 5 kmolÁm À3 HCl and addition of 1 vol% H 2 O 2 . The recovery of platinum, palladium and rhodium after 3 h leaching reaches 88%, 99%, 77%, respectively.

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Section: Resultssupporting

confidence: 85%

Leaching of Pt, Pd and Rh from Automotive Catalyst Residue in Various Chloride Based Solutions

et al. 2006

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“…Platinum did not occur in solution after leaching, or its content in liquid phase was low in trace level, which was in line with expectations. Dissolution of PGMs is only possible and performed with strong oxidants: in widely known mixtures of HCl/HNO 3 , in alternative chloride precursors such as AlCl 3 , alone or mixed with HCl, using HNO 3 as oxidant or in other common leachant mixture like HCl/H 2 O 2 or HCl/Cl 2 [9][10][11].…”

Section: Resultsmentioning

confidence: 99%

Dissolution of Metal Supported Spent Auto Catalysts in Acids

Fornalczyk¹,

Kraszewski²,

Willner³

et al. 2016

Archives of Metallurgy and Materials

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Metal supported auto catalysts, have been used in sports and racing cars initially, but nowadays their application systematically increases. In Metal Substrate (supported) Converters (MSC), catalytic functions are performed by the Platinum Group Metals (PGM): Pt, Pd, Rh, similarly to the catalysts on ceramic carriers. The contents of these metals make that spent catalytic converters are valuable source of precious metals. All over the world there are many methods for the metals recovery from the ceramic carriers, however, the issue of platinum recovery from metal supported catalysts has not been studied sufficiently yet. The paper presents preliminary results of dissolution of spent automotive catalyst on a metal carrier by means of acids: H2SO4, HCl, HNO3, H3PO4. The main assumption of the research was the dissolution of base metals (Fe, Cr, Al) from metallic carrier of catalyst, avoiding dissolution of PGMs. Dissolution was the most effective when concentrated hydrochloric acid, and 2M sulfuric acid (VI) was used. It was observed that the dust, remaining after leaching, contained platinum in the level of 0.8% and 0.7%, respectively.

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“…Batch experiments were performed at 25°C in a shaker (VS-8480SF, Vision Scientific Co., Ltd.) in 100 cm 3 screw- 3 ) and resin in the concentration range 0.25 g/dm 3 were shaken for 24 h. After separation by filtration, the concentrations of metal ions in the solution were determined using ICP-OES (ICPS-7500, Shimadzu). The concentrations of metal ions loaded onto the resin were obtained by mass balance.…”

Section: Ion-exchange Proceduresmentioning

confidence: 99%

“…The concentrations of Pt and Rh were 1 © 10 ¹3 and 2 © 10 ¹4 mol/dm 3 , respectively. The concentration of HCl was varied from 0.1 to 5 mol/dm 3 . The resin concentration was varied from 0.2 to 5 g/dm 3 .…”

Section: Batch Experiments 311 Effects Of Acid and Resin Concentratmentioning

confidence: 99%

“…The concentrations of PGMs in spent automobile catalysts are generally higher than those in ore bodies. 3) In the hydrometallurgical treatment of spent catalysts, the valuable metals are first dissolved by leaching with chloride-based solutions. 4) Pd can be separated from chloride leaching solutions containing Pt, Pd and Rh using solvent extraction with kinds of extractants, among of which ¢-hydroxyoxime has been used in practice.…”

Section: Introductionmentioning

confidence: 99%

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Separation of Platinum(IV) and Rhodium(III) from Hydrochloric Acid Solutions Using Diaion Resins

et al. 2015

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Pt and Rh in HCl solutions were separated by adsorption with strong basic resins (Diaion SA10A, Diaion SA20A, and Diaion PA308) in the HCl concentration range 0.15 mol/dm 3 . The molar ratio of Pt to Rh in the feed solution was fixed at 5 : 1, based on the composition of spent automobile catalysts. The resins used had selectivity for Pt over Rh, and the adsorptions of both metals were clearly affected by the acid concentration. Batch experiments indicated that it is possible to separate Pt from Rh at low acid concentrations with these resins; Diaion SA10A was the most effective. The feasibility of separation of Pt and Rh with Diaion SA10A was verified using continuous column experiments. The loaded Diaion SA10A resin was regenerated by elution with a mixture of HCl and thiourea.

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Cited by 55 publications

References 5 publications

Leaching of Pt, Pd and Rh from Automotive Catalyst Residue in Various Chloride Based Solutions

Leaching of Pt, Pd and Rh from Automotive Catalyst Residue in Various Chloride Based Solutions

Dissolution of Metal Supported Spent Auto Catalysts in Acids

Separation of Platinum(IV) and Rhodium(III) from Hydrochloric Acid Solutions Using Diaion Resins

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