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Late transition metals recovery from silver nitrate electrolyte using a phosphine-oxide bearing scavenger

Abstract

Silver is one of the eight precious metals, along with gold and the six platinum-group metals (PGM). Most of the silver is being obtained as a by-product of other metals mining and refining. Fine silver is produced in electrolytic processes, using silver anodes (electrolytic refining) or inert ones (electrowinning) and acidified silver nitrate electrolyte. Because the standards for refined silver are very high, it is necessary to control the behaviour of the impurities. Depending on the refining process parameters, it is not uncommon to find precious metals, such as palladium, platinum or even gold, dissolved in the electrolyte. In particular, palladium is very challenging because of its standard oxidation-reduction potential similar to the one of silver (E0Pd/Pd2+ = 0.987 V, E0Ag/Ag+ = 0.799 V). The recovery of palladium and platinum from the silver refining processes is important for two reasons: to produce high quality silver and to recover the valuable precious metals. In this work, Pd and to a lesser extent Pt recovery from silver nitrate effluent was investigated using a phosphine oxide – bearing coordinating resin (MPX-310). Laboratory scale studies, in batch and continuous modes, have shown the ability of MPX-310 to capture Pd and Pt from a matrix highly concentrated in Ag (up to 131 g/L) and Cu (up to 70 g/L) from industrial effluents. Moreover, adiabatic calorimetry studies were performed in order to determine the reactivity of the resin in the silver nitrate effluent and the optimal conditions where this resin can be safely used in an industrial process. Pilot scale experiments were done and confirmed the results obtained in the laboratory.

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Publication details

The article was received on 12 Dec 2017, accepted on 14 Feb 2018 and first published on 15 Feb 2018


Article type: Paper
DOI: 10.1039/C7NJ04928E
Citation: New J. Chem., 2018, Accepted Manuscript
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    Late transition metals recovery from silver nitrate electrolyte using a phosphine-oxide bearing scavenger

    A. Muşină, S. van Zutphen and V. Lavric, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C7NJ04928E

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