Solvent extraction of actinides and fission products by amides and crown ether compounds

アミドとクラウン化合物によるアクチノイド、核分裂生成元素の溶媒抽出

佐々木 祐二  ; 鈴木 伸一; 森田 圭介 

Sasaki, Yuji; Suzuki, Shinichi; Morita, Keisuke

多くの種類のアクチノイド元素や核分裂生成元素が高レベル廃液中(HLW)に含まれる。そこで、アクチノイド、ランタノイド、Zr, Mo, Tc, Cs, Sr, Pdの溶媒抽出分離を検討した。アクチノイドやランタノイドはTODGA, ZrはマロンアミドかHDEHP, Mo, Tc, PdはMIDOAのようなアミド化合物で抽出される。残るCs, Srはクラウン化合物で抽出可能である。講演ではこれら元素の抽出条件や、相互分離について報告する。

Many kinds of metals with high concentration exist in high level radioactive waste (HLW). Most of metals have high radioactivity and strong heat, then there should be removed from aqueous phase. Target metals in HLW are as follows, actinides, lanthanides, zirconium, molybdenum, technetium, cesium, strontium, and palladium, due to long range radioactivity, huge environmental burden, and high concentration then troublemsome metals. We try to separate these metals by solvent extraction. Actinides and lanthanides can be extracted by TODGA (tetraoctyl-diglycolamide) from nitric acid, Zr is done by malonamide (or HDEHP), Mo, Re (substitution for Tc) and Pd can be extracted by MIDOA (methylimino-dioctylacetamide), and Sr and Cs can be removed by crown ether compounds. These extractants, except for HDEHP, belong to CHON compounds, which leads less secondary waste generation.