Abstract
The reduction path of the U 3O 8 powder vol-oxidized at 1200 °C has been determined by a series of electrochemical experiments in a 1 wt.% Li 2O/LiCl molten salt. Various reaction intermediates are observed by during electrolysis of U 3O 8. The formation of the metallic uranium is caused from two different reduction paths, a direct reduction of uranium oxide and an electro-lithiothermic reduction. As the uranium oxide is converted to the metallic uranium, the lithium metal is more actively formed in the cathode basket. The reducibility of the rare earth oxides with the U 3O 8 powder has been tested by constant voltage electrolysis. The results suggest the advanced vol-oxidation could lead to the enhancement in the reducibility of the rare earth fission products.
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