Simultaneous recovery of all actinides from spent nuclear fuel by carbamoylmethylphosphine oxide in fluorinated diluents

CMPO-フッ素系希釈剤による使用済核燃料からの全アクチニドの同時一括回収

小澤 正基; 岩井 武彦*; Babain, V.*; Shadrin, A.*

Ozawa, Masaki; Iwai, Takehiko*; Babain, V.*; Shadrin, A.*

フッ素系極性希釈剤に溶解したCMPO抽出剤によるf元素の第3相生成特性,抽出及び逆抽出特性を検討した。0.4-0.8MCMPO/30%TBP/Metanitrobenzotrifluoride抽出剤による抽出使用済核燃料溶解液中からの全アクチニドの同時一括抽出,Salt-free錯化剤,methylamine carbonate、によるU+Nu+NP群,Am+VCm群の分別的逆抽出を示唆した。

Bifunctional organophosphorus extractants dissolved in polar fluorinated diluents were studied aiming at directly recovering all f-elements from the dissolver solution of spent nuclear fuel. Distribution ratios of U, Np and Pu were sufficiently high for 0.40.8MCMPO in this solvent system, and combination of salt-free, methylamine carbonate (MAC), etc, were evaluated to obtain fractional stripping of f-elements. Static multi-stage extraction using artificial FBR dissolver solution supported the process feasibility.