Recovery of Platinum from a Spent Automotive Catalyst through Chloride Leaching and Solvent Extraction
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Departamento de Ingeniería Geológica y Minera, E.T.S.I. Minas y Energía. Universidad Politécnica de Madrid, 28040 Madrid, Spain
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Laboratório Nacional de Energia e Geologia, I. P. (LNEG), Campus do Lumiar, 1649-038 Lisboa, Portugal
3
Centro de Química Estrutural (CQE), Faculdade de Ciências, Universidade de Lisboa (FCUL), Campo Grande, 1749-016 Lisboa, Portugal
*
Author to whom correspondence should be addressed.
Academic Editor: Daniel Goldmann
Recycling 2021, 6(2), 27; https://doi.org/10.3390/recycling6020027
Received: 17 March 2021
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Revised: 8 April 2021
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Accepted: 15 April 2021
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Published: 17 April 2021
(This article belongs to the Special Issue Hydrometallurgical Recycling of Critical Metals from End-of-Life Devices)
Considering economics and environmental sustainability, recycling of critical metals from end-of-life devices should be a priority. In this work the hydrometallurgical treatment of a spent automotive catalytic converter (SACC) using HCl with CaCl2 as a leaching medium, and solvent extraction (SX) with a thiodiglycolamide derivative, is reported. The aim was to develop a leaching scheme allowing high Pt recoveries and minimizing Al dissolution, facilitating the application of SX. The replacement of part of HCl by CaCl2 in the leaching step is viable, without compromising Pt recovery (in the range 75–85%), as found for the mixture 2 M CaCl2 + 8 M HCl when compared to 11.6 M HCl. All leaching media showed good potential to recover Ce, particularly for higher reaction times and temperatures. Regarding SX, results achieved with a model solution were promising, but SX for Pt separation from the real SACC solution did not work as expected. For the adopted experimental conditions, the tested thiodiglycolamide derivative in toluene revealed a very good loading performance for both Pt and Fe, but Fe removal and Pt stripping from the organic phases after contact with the SACC solution were not successfully accomplished. Hence, the reutilization of the organic solvent needs improvement.
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Keywords:
platinum-group metals (PGMs); cerium; hydrometallurgical recovery; chloride media; liquid-liquid extraction; thiodiglycolamide derivative
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MDPI and ACS Style
Méndez, A.; Nogueira, C.A.; Paiva, A.P. Recovery of Platinum from a Spent Automotive Catalyst through Chloride Leaching and Solvent Extraction. Recycling 2021, 6, 27. https://doi.org/10.3390/recycling6020027
AMA Style
Méndez A, Nogueira CA, Paiva AP. Recovery of Platinum from a Spent Automotive Catalyst through Chloride Leaching and Solvent Extraction. Recycling. 2021; 6(2):27. https://doi.org/10.3390/recycling6020027
Chicago/Turabian StyleMéndez, Ana, Carlos A. Nogueira, and Ana P. Paiva. 2021. "Recovery of Platinum from a Spent Automotive Catalyst through Chloride Leaching and Solvent Extraction" Recycling 6, no. 2: 27. https://doi.org/10.3390/recycling6020027
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