Abstract
The extraction of platinum group metals (PGM) contained in waste automobile catalyst monolithic honeycomb was investigated by a novel approach that combines a pyro-metallurgical and electrolysis step. The first step aims to both up-concentrate the amount of PGMs by using a metal collector, as well as to prepare the conductive material to be used as anode in the electrolysis step. The electrolysis step is carried out in a molten chloride electrolyte, where the PGMs remain as metallic residue, and the refined metal is further reused in the pyro-metallurgical step. Optimization of the pyro-metallurgical process led to 82–100% metal recovery rates, while the PGM recovery rates were close to 100%. Furthermore, the electrolyte composition and working temperature, as well as cell design of the subsequent electrolytic method, were adjusted. The process was assessed in a lab-scale electrolysis reactor, where PGMs could be extracted selectively at a current efficiency of around 70%.
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References
Sinisalo P, Lundström M (2018) Refining approaches in the PGM processing value chain. a review. Metals 8:203–215
Martinez AM, Osen KS, Støre A (2020) Recovery of PGM from secondary sources by selective chlorination from molten salt media. Rare Metal Technol 221–233
Peng Z et al (2017) Pyro-metallurgical recovery of platinum group metals from spent catalysts. JOM 69:1553–1562
Kisza A, Kazmierczak J (1991) Kinetics of electrode reactions on metallic electrodes in pure molten chlorides. Chem Papers 45(2):187–194
Bellemans I, De Wilde E, Moelans N, Verbeken K (2018) Metal losses in pyro-metallurgical operations—a review. Adv Colloid Interface Sci 47–63
Mills K (2014) How mold fluxes work. In:Seethraman S (ed) Treatise on process metallurgy, vol 3. Industrial processes. Elsevier 435–475
HSC Chemistry v7.11, © Outotec
Castrillejo Y, Bermejo MR, Martínez AM, Pardo R, Sánchez S, Picard G (1999) Electrochemical behaviour of copper ions in molten equimolar CaCl2-NaCl mixture at 550 °C. In: Gaune-Escard M (ed) Advances in molten salts, 32–49. ISBN 1–56700–142–4
Acknowledgements
This work has received funding from the European Union's H2020 Programme under GA No. 730224 (www.platirus.eu).
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Martinez, A.M., Tang, K., Sommerseth, C., Osen, K.S. (2021). Extraction of Platinum Group Metals from Spent Catalyst Material by a Novel Pyro-Metallurgical Process. In: Azimi, G., et al. Rare Metal Technology 2021. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-65489-4_12
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DOI: https://doi.org/10.1007/978-3-030-65489-4_12
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