[2L16-20] Vitrification 3

[2L16] Development of Recovery Process of Platinum-group Metals from HLLW for Stable Production and Volume Reduction of Homogeneous Vitrified Object

(22)Extraction of Platinum Group Metals from Nitric Acid Solutions Using Thiodiglycolamides and Tertiary Amines

*Michal Cibula¹, Yusuke Inaba¹, Kenji Takeshita¹, Hirokazu Narita² (1. Advanced Nuclear Fuel Cycle Unit, Institute of Innovative Research, Tokyo Institute of Technology, 2. Resources Refining Chemistry Research Group, Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology)

Keywords:solvent extraction, synergistic effect, platinum group metals, thiodiglycolamide, tertiary amine

Two novel thiodiglycolamides (TDGA) extractants were synthesized and their abilities to extract Pd(II), Rh(III) and Ru(III) from nitric acid solutions were studied. In order to improve extractability of Rh(III), mixed solvents of TDGA extractants and tertiary amine extractants were used. Pd(II) and Ru(III) were extracted by only TDGA from nitric acid solutions. Slope analyses and Job's plots were used to assume the stoichiometry of extracted complexes.