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Development of engineering scale extraction chromatography separation system, 3; Designing of pre-column system for sludge removal

抽出クロマログラフィ法による元素分離システムの工学規模スケール開発,3; スラッジ除去のためのプレカラムの検討

高畠 容子  ; 渡部 創  ; 渡部 雅之; 佐野 雄一   ; 竹内 正行 

Takahatake, Yoko; Watanabe, So; Watanabe, Masayuki; Sano, Yuichi; Takeuchi, Masayuki

使用済み核燃料再処理にて発生する高レベル放射性廃液ではスラッジが発生する可能性がある。スラッジはMA分離のための抽出クロマトグラフィ工程に影響を与える可能性がある。そこで、抽出クロマトグラフィ工程の前段にてスラッジを回収するプレカラムについて検討した。プレカラムは多孔質シリカ粒子を充填材とし、充填材の充填及び抜出方法について検討を行った。充填材は塊状となり、水流による取り出しの障害となった。プレカラムへの水の供給に係る運転方法に関する検討が必要と分かった。

High level liquid waste generated from reprocessing of spent nuclear fuel is possible to form precipitations so called as sludge. The sludge will significantly influence on extraction chromatography technology for trivalent minor actinide (MA(III)) recovery. Applicability of a pre-column as a filter for removal of the sludge was experimentally evaluated. In this study, remote handling media exchanging experiments were carried out, and a concept of the pre-column system was proposed based on the results. The media of the pre-column was porous silica particle. Since the media formed block, it interfered water current on ejecting porous silica particle. It was better on trickling basis and using upper outlet than other system, but the operation to control the media block behavior and optimization of water flow is needed.

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