[1H06-10] Separation and Recovery of Actinide Elements

[1H06] Fundamental Study on Carbonate-based Simple Reprocessing Utilizing Photochemical Reactivity of UO₂²⁺

(1) Principle and Demonstration of Photochemical Recovery of Uranium from Carbonate Solution

Shogo Uchida¹, Satoru Tsushima^1,2, *Koichiro Takao¹ (1. Tokyo Tech, 2. HZDR)

Keywords:Carbonate-based Reprocessing, Uranyl(VI) Carbonate, UO2, Photochemical Reduction

To establish chemical fundamentals of carbonate-based simple reprocessing technology, we have attempted recovery of U through photochemical reduction of a triscarbonato uranyl(VI) complex. As a result, U efficiently deposited as UO₂ under light-illumination and presence of N₂H₄. We have also studied dependency on several parameters such as solution conditions and the light wavelength as well as impact of H₂O₂ added at the prior stage to dissolve spent nuclear fuels.