Print Email Facebook Twitter Electrochemical extraction of rare earth metals in molten fluorides Title Electrochemical extraction of rare earth metals in molten fluorides: Conversion of rare earth oxides into rare earth fluorides using fluoride additives Author Abbasalizadeh, A. (TU Delft (OLD) MSE-3) Malfliet, Annelies (Katholieke Universiteit Leuven) Seetharaman, Seshadri (KTH Royal Institute of Technology) Sietsma, J. (TU Delft (OLD) MSE-3) Yang, Y. (TU Delft (OLD) MSE-3) Date 2017 Abstract In the present research on rare earth extraction from rare earth oxides (REOs), conversion of rare earth oxides into rare earth fluorides with fluoride fluxes is investigated in order to overcome the problem of low solubility of the rare earth oxides in molten fluoride salts as well as the formation of oxyfluorides in the fluorination process. Based on thermodynamic calculations, a series of experiments were performed for converting the rare earth oxides into rare earth fluorides using AlF3, ZnF2, FeF3, and Na3AlF6 as fluorinating agents in a LiF–Nd2O3 system. The formation of neodymium fluoride as a result of the reactions between these fluxes and neodymium oxide is confirmed. The rare earth fluoride thus formed can subsequently be processed through the electrolysis route in the same reactor, and rare earth metal can be produced as the cathodic deposit. In this concept, the REO dissolution in molten fluorides would become unnecessary due to the complete conversion of the oxide into the fluoride, REF3. The results of XRD and EPMA analysis of the reacted samples indicate that AlF3, ZnF2, and FeF3 can act as strong fluorinating agents for the neodymium oxide giving rise to a complete conversion of neodymium oxide into neodymium fluoride. Subject Rare earth oxidesRecyclingFluorination To reference this document use: http://resolver.tudelft.nl/uuid:2e80324f-47b2-43a5-86fa-1782e5e3915f DOI https://doi.org/10.1007/s40831-017-0120-x Source Journal of Sustainable Metallurgy, 3 (3), 627–637 Part of collection Institutional Repository Document type journal article Rights © 2017 A. Abbasalizadeh, Annelies Malfliet, Seshadri Seetharaman, J. Sietsma, Y. Yang Files PDF 10.1007_s40831_017_0120_x_1.pdf 2.33 MB Close viewer /islandora/object/uuid:2e80324f-47b2-43a5-86fa-1782e5e3915f/datastream/OBJ/view