Journal
CHEMICAL ENGINEERING SCIENCE
Volume 63, Issue 13, Pages 3485-3492Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2008.04.021
Keywords
electrolysis; materials processing; molten salt; powders; separations; U3O8
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An electrolytic reduction of U3O8 in a molten LiCl-Li2O salt was investigated using the electrochemical techniques of cyclic voltammetry (CV) and chronopotentiommetry (CP). The electrolytic reduction of U3O8 powder exhibited a different behavior when the initial current density was higher than 200 mA/cm(2) for 10 g U3O8/batch run. Two kinds of reduction mechanisms, an electro-metallothermic reduction (EMR) and a direct electrochemical reduction (DER) were adopted to explain the resultant behavior. Current efficiencies and reduction products were obtained by a series of constant current runs. Current efficiencies, evaluated for a reduction side, were estimated to be more than 75% throughout a series of constant current runs and lithium uranium oxides (lithium uranates) were detected during the U3O8 reduction to metallic uranium. (C) 2008 Elsevier Ltd. All rights reserved.
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