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Americium and curium recovery using extraction chromatography from simulated acidic raffinate from the PUREX process

抽出クロマトグラフ法による酸性PUREX抽残液模擬溶液からのAm, Cmの回収

松村 達郎  ; 森田 泰治  ; 松村 和美; 佐野 雄一   ; 駒 義和  ; 野村 和則  

Matsumura, Tatsuro; Morita, Yasuji; Matsumura, Kazumi; Sano, Yuichi; Koma, Yoshikazu; Nomura, Kazunori

FaCTの一環として、抽出クロマトグラフ法によるMA回収技術を確立するため、担体であるSiO$$_{2}$$-P粒子に抽出剤を担持させた吸着材を用いるフローシートを検討している。抽出クロマトグラフ法においても、抽出剤は溶媒抽出法と同様な特性を発揮すると考えられるためMA・Ln回収工程とMA/Ln分離工程の2サイクルから構成されるフローシートとして進めている。本研究では、MA・Ln回収工程にTODGA吸着材及びCMPO吸着剤,MA/Ln分離工程にHDEHP吸着材,R-BTP吸着剤及びTOPEN吸着剤を使用した。フローシート全体を通じた各元素の分離挙動を観察した結果、TODGA吸着剤とR-BTP吸着剤あるいはTOPEN吸着剤を組合せたフローシートによってMA(III)を模擬再処理抽残液から分離することが可能であることを確認した。

As a part of the FaCT project, R&D of a reprocessing system for fast reactor spent fuel has been conducted. In the system, trivalent minor actinides (An(III) = Am(III) + Cm(III)) are recovered by the method of extraction chromatography from a raffinate from the reprocessing process. The chemical flowsheet is composed of the two cycles system; An(III) + lanthanides (Ln)(III) recovery and An(III)/Ln(III) separation. A best combination of extractants should be considered on the latest extractant development for application. In the course of our development, CMPO and TODGA for An(III) + Ln(III) recovery, and HDEHP, TOPEN and isoHEX-BTP for An(III)/Ln(III) separation were investigated. The adsorbent for the extraction chromatography is based on the composite material of porous silica support and polystyrenedivinylbenzene (SiO$$_{2}$$-P) impregnated with the extractants. The flowsheet tests using simulated acidic raffinate from reprocessing process containing TRU tracers were carried out. In this study, it was demonstrated that Am and Cm can be separated from the simulated raffinate with combinations TODGA adsorbent column and isoHEX-BTP adsorbent column or TOPEN adsorbent column. The flow sheets will separate An(III) effectively by improving condition of flow velocity, column length and ionic strength of the feed solution.

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