Studies on platinum recovery from solutions after leaching of spent catalysts by solvent extraction
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Czestochowa University of Technology
Publication date: 2012-01-01
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Beata Pospiech   

Department of Chemistry, Czestochowa University of Technology, 42-200 Czestochowa, Armii Krajowej 19, Poland
Physicochem. Probl. Miner. Process. 2012;48(1):239-246
The results of studies on the separation of platinum(IV) ions by solvent extraction from aqueous solutions after leaching of spent catalysts have been reviewed. The following processes have been discussed: acid leaching of spent catalysts and solvent extraction of platinum(IV) ions by using organophosphorous acids, amines and oximes as the extractants. In hydrometallurgical leaching of spent automobile catalysts many reagents such as aqua regia solutions, aluminum chloride solutions with low concentrations of nitric acid as an oxidant, and sodium cyanide solutions were tested. After leaching, the metal ions in leach solutions have to be separated and purified by solvent extraction. Typical leach liquor contains economically valuable metal ions such as platinum(IV), palladium(II), rhodium(III) nickel(II) and manganese(II). The influence of several factors on the efficiency and selectivity of platinum(IV) ions extraction from leach solutions was shown. The optimum conditions of these processes were also reported on the ground of literature survey.
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