Electrolysis of metal oxides in MgCl2 based molten salts with an inert graphite anode

Yuan, Yating and Wei, Li and Zhiyong, Wang and Xianbo, Jim and Chen, George Z. (2016) Electrolysis of metal oxides in MgCl2 based molten salts with an inert graphite anode. Faraday Discussions . ISSN 1364-5498

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Abstract

Eletrolysis of solid metal oxides has been demonstrated in MgCl2-NaCl-KCl melt at 700 oC taking the electrolysis of Ta2O5 as an example. Both the cathodic and anodic processes have been investigated using cyclic voltammetry, potentiostatic and constant voltage electrolysis, with the cathodic products analysed by XRD, SEM and the anodic products by GC. Fast electrolysis of Ta2O5 against a graphite anode has been realized at a cell voltage of 2 V , or a total overpotential of about 400 mV. The energy consumption was about 1 kWh/kg-Ta with a nearly 100% Ta recovery. The cathodic product was nanometer Ta powder with sizes of about 50 nm. The main anodic product was Cl2 gas, together with about 1 mol% O2 gas and trace of CO. The graphite anode was found to be an excellent inert anode. These results promise an environment-friendly and energy efficient method for metal extraction by electrolysis of metal oxides in MgCl2 based molten salts.

Item Type: Article
Schools/Departments: University of Nottingham, Ningbo Campus > Faculty of Science and Engineering > Division of Engineering
Identification Number: https://doi.org/10.1039/C5FD00231A
Depositing User: Eprints, Support
Date Deposited: 18 Jul 2016 07:31
Last Modified: 19 Sep 2016 22:28
URI: http://eprints.nottingham.ac.uk/id/eprint/34058

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