[2K05-08] Nuclide Adsorption and Separation 1

[2K05] Facile, Efficient and Selective Recovery of Palladium from Simulated High-Level Radioactive Wastes through Chemical Reduction Catalyzed by Coexisting Chalcogens

*Falitiana Randrianasolo¹, Koichiro Takao¹ (1. Tokyo Tech)

Keywords:High-level radioactive waste, Pd recovery, N2H4·H2O, chalcogen, chemical reduction

Chemical reduction of Pd by N₂H₄ in HNO₃ aq was studied to demonstrate facile recovery of Pd from simulated HLW. Full and selective recovery of Pd with co-precipitation of Se can be achieved by addition of 60.5 mM N₂H₄·H₂O. First, a yellow amorphous phase containing Pd(II) is formed, followed by its reduction to Pd(0) under a catalytic effect of the concomitant Se. Further separation of Se from the recovered Pd would be required.