[1B05-07] Behaviour of Actinide Elements

[1B06] Investigation on separation and extraction behavior of An and Ln using hydrophilic and lipophilic multidentate ligands

*Yuji Sasaki¹, Kaneko Masashi^1,2, Ban Yasutoshi¹ (1. Japan Atomic Energy Agency, 2. Osaka University)

Keywords:actinide, lanthanide, mutual separation, multidentate ligand, solvent extraction

Using TODGA and ADAAM extractants, which have been developed by JAEA, the whole recovery of An and Ln, and mutual separation of Am/Cm have been achieved. Recent studies give the very high SF(Ln/An) over 100 and show the different chemical behavior between An and Ln, using solvent extraction of tri, tetradentate extractant and masking agent including O and N donor atoms. Thus, we would like to confirm these conditions to satisfy the subsequent features, ① to maintain the favorable concentrations of extractants and masking agents for Ln recovery in HLW, ② to show high SF using sets of D values over and under 1. In presentation, we will show the difficulties of An/Ln separation and direction of researches, and present the SF(An/Ln) using various extractants and masking agents.