Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2557
Título: Oxidative leaching process with cupric ion in hydrochloric acid mediafor recovery of Pd and Rh from spent catalytic converters
Autor: Nogueira, C. A.
Paiva, A. P.
Oliveira, Paula C.
Costa, M. Clara
Costa, Ana M. Rosa da
Palavras-chave: Hydrometallurgy
Recycling
Oxidative leaching
Cupric chloridea
Pd-Rh catalyst
Data: 2014
Editora: Elsevier
Citação: Nogueira, C.A.; Paiva, A.P.; Oliveira, P.C.; Costa, M.C.; Costa, A.M. Rosa da. - Oxidative leaching process with cupric ion in hydrochloric acid mediafor recovery of Pd and Rh from spent catalytic converters. In: Journal of Hazardous Materials, 2014, Vol. 278, p. 82-90
Resumo: The recycling of platinum-group metals from wastes such as autocatalytic converters is getting growing attention due to the scarcity of these precious metals and the market pressure originated by increase of demand in current and emerging applications. Hydrometallurgical treatment of such wastes is an alternative way to the most usual pyrometallurgical processes based on smelter operations. This paper focuses on the development of a leaching process using cupric chloride as oxidising agent, in HCl media, for recovery of palladium and rhodium from a spent catalyst. The chloride media allows the adequate conditions for oxidising and solubilising the metals, as demonstrated by equilibrium calculations based on thermodynamic data. The experimental study of the leaching process revealed that Pd solubilisation is clearly easier than that of Rh. The factors temperature, time, and HCl and Cu2+ concentrations were significant regarding Pd and Rh leaching, the latter requiring higher factor values to achieve the same results. Leaching yields of 95% Pd and 86% Rh were achieved under optimised conditions (T = 80.C, t = 4 h,[HCl] = 6 M, [Cu2+] = 0.3 M).
URI: http://hdl.handle.net/10400.9/2557
ISSN: 0304-3894
Versão do Editor: http://dx.doi.org/10.1016/j.jhazmat.2014.05.099
Aparece nas colecções:UEE - Artigos em revistas internacionais

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