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Neodymium electrowinning into copper-neodymium alloys by mixed oxide reduction in molten fluoride media

Ciumag, Mihaela Raluca and Gibilaro, Mathieu and Massot, Laurent and Laucournet, Richard and Chamelot, Pierre Neodymium electrowinning into copper-neodymium alloys by mixed oxide reduction in molten fluoride media. (2016) Journal of Fluorine Chemistry, 184. 1-7. ISSN 0022-1139

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Official URL: https://doi.org/10.1016/j.jfluchem.2016.02.001

Abstract

The possibility of neodymium electrowinning from neodymium oxide using a reducing agent (RA) produced in-situ by solvent reduction was investigated in molten LiF⿿CaF2⿿Li2O between 900 °C and 1040 °C. Nd2O3 galvanostatic electrolyses were performed and reaction products were analyzed by SEM, XRD and electron-probe microscopy. Metallic neodymium was not directly obtained, due to several limitations for Nd2O3 reduction: low electrical conductivity, unfavourable Pilling⿿Bedworth coefficient and formation of a dense insulating CaO layer on the sample surface. Consequently, the reduction of a pellet made of a neodymium oxide-metallic oxide mixture was carried out as an alternative pathway. Nd2O3-CuO reduction led to metallic neodymium production in the form of liquid Cu-Nd alloys. A reaction mechanism was proposed based on these experimental results:

Item Type:Article
HAL Id:hal-01890092
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Commissariat à l'Energie Atomique et aux énergies alternatives - CEA (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Loetitia MOYA
Deposited On:08 Oct 2018 10:18

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