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Report No.
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Pyro-chemical reprocessing using molybdate melt chemical and electrochemical behaviors of uranium oxides in Na$$_{2}$$MoO$$_{4}$$ melt

Mizuguchi, Koji; Yasuike, Yoshiyuki*; Fukushima, Mineo ; Myochin, Munetaka

We develop a new decladding process which integrates with dissolution using the molybdenum oxide melt. This melt possesses characteristics that can make actinide oxide dissolve at high speed without reacting with metal such as the cladding tube. To construct the new process, it is necessary to clarify the reaction mechanisms of uranium in dissolution, oxidation, and electrolysis in this melt. In this study, the gram-scale uranium examination was carried out, and the reaction mechanism of the uranium in the melt was clarified. In Na$$_{2}$$MoO$$_{4}$$ - Na$$_{2}$$Mo$$_{2}$$O$$_{7}$$ melts, uranium dioxide dissolves as Na$$_{4}$$U(MoO$$_{4}$$)$$_{4}$$ without changing its oxidation number. In the oxidation, uranium valence was oxidized from IV to VI with oxygen. In electrolysis process, it was clarified that the low current efficiency was caused by the re-dissolution of deposit. The granulated UO$$_{2}$$ was recovered on the cathode by adjusting the temperature of the melt to 700 degrees centigrade at which re-dissolution was reduced.

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