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Thermal degradation and vitrification properties of MA adsorbents

MA吸着材の熱分解及びガラス化特性

小藤 博英  ; 渡部 創  ; 後藤 一郎; 折内 章男; 竹内 正行 ; 小林 秀和 ; 捧 賢一

Kofuji, Hirohide; Watanabe, So; Goto, Ichiro; Oriuchi, Akio; Takeuchi, Masayuki; Kobayashi, Hidekazu; Sasage, Kenichi

マイナーアクチニド(MA)等の分離法として開発を進めている抽出クロマトグラフィにおいて使用する抽出剤含浸吸着材の特性評価及び模擬高放射性廃液元素の吸脱着を行った使用済吸着材のガラス固化体原料としての利用可能性を評価するためのガラス化試験及び化学的安定性の評価を行った。CMPOやHDEHP抽出剤等の有機物を含有する吸着材に適したガラス化溶融手順を策定するとともに、試料は良好にガラス化され、十分な化学的安定性を有することを確認した。

Vitrification procedure for extraction chromatography using porous silica particles covered with extractant was investigated. In this method, minor actinides (MAs) were separated from high-level radioactive liquid waste by extractant CMPO and/or HDEHP. In this study, thermal degradation behavior and vitrification properties were evaluated from the viewpoints of high-level wasteform properties using porous silica adsorbent impregnated with extractant CMPO and HDEHP. As the results of various experiments, suitable vitrification procedure for MA/RE adsorbents was clarified and selected adsorbent was generally well-vitrified and had enough chemical durability.

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