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Reduction behavior of UO$$_{2}$$$$^{2+}$$ in molten LiCl-RbCl and LiCl-KCl eutectics by using tungsten

Nagai, Takayuki; Uehara, Akihiro*; Fujii, Toshiyuki*; Yamana, Hajimu*

The reduction of uranium from UO$$_{2}$$$$^{2+}$$ to UO$$_{2}$$$$^{+}$$ or U$$^{4+}$$ in molten LiCl-RbCl and LiCl-KCl eutectics was examined by using tungsten and chlorine gas. Spectrophotometric technique was adopted to determine the concentration of uranium species. When tungsten was immersed into the LiCl-RbCl eutectic melt at 400$$^{circ}$$C without supplying chlorine gas, 36% of the total weight of the hexavalent of UO$$_{2}$$$$^{2+}$$ was reduced to the pentavalent of UO$$_{2}$$$$^{+}$$. Under purging chlorine gas into the melt, 96% of UO$$_{2}$$$$^{2+}$$ was reduced to the tetravalent of U$$^{4+}$$. Tungsten oxy-chloride of WOCl$$_{4}$$ was produced via the reductions of UO$$_{2}$$$$^{2+}$$, which was volatized from the melt and adsorbed on the upper part of experimental cell. On the other hand, 84% of UO$$_{2}$$$$^{2+}$$ in the LiCl-KCl eutectic melt at 500$$^{circ}$$C was reduced to U$$^{4+}$$ by using tungsten and chlorine gas.

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Category:Materials Science, Multidisciplinary

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