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Gibilato, Mathieu
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article
Process Optimization to Avoid Perfluorocarbon Emission During Neodymium Rare Earth Electrolysis in Molten LiF-NdF<sub>3</sub>-Nd<sub>2</sub>O<sub>3</sub>
Abstract
<jats:p>Influence of Nd<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> in LiF-NdF<jats:sub>3</jats:sub>-Nd<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> melt on carbon anode oxidation was investigated by infra-red spectroscopy and electrochemical techniques to prevent CF<jats:sub>X(g)</jats:sub> formation during Nd metal production. A gas extractor device was developed to provide fast analysis of the electrochemically produced gas: the carbon anode was only oxidized into CO<jats:sub>2(g)</jats:sub> until a critical current density was reached. For higher values, CF<jats:sub>4(g)</jats:sub> and C<jats:sub>2</jats:sub>F<jats:sub>6(g)</jats:sub> were also produced. It was associated to diffusion limited current density of NdOF<jats:sub>5</jats:sub><jats:sup>4−</jats:sup>. To avoid CF<jats:sub>X(g)</jats:sub> production during the process, the influence of Nd<jats:sub>2</jats:sub>O<jats:sub>3</jats:sub> and temperature on this limiting current density was determined by steady-state voltammetry.</jats:p>