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Extraction of uranium from simulated ore by the supercritical carbon dioxide fluid extraction method with nitric acid-TBP complex

硝酸-TBP錯体を用いる超臨界二酸化炭素抽出法による模擬鉱石からのウランの抽出

Dung, L. T. K.*; 今井 智紀*; 富岡 修; 中島 幹雄; 高橋 邦明; 目黒 義弘

Dung, L. T. K.*; Imai, Tomoki*; Tomioka, Osamu; Nakashima, Mikio; Takahashi, Kuniaki; Meguro, Yoshihiro

抽出剤として硝酸とリン酸トリブチルの錯体を含む超臨界二酸化炭素を用いる超臨界流体抽出法(SFE)を数種のリン酸ウラニル化合物と模擬ウラン鉱物からのウランの抽出に適用した。静的抽出工程と動的抽出工程からなる抽出法を構築し、圧力,温度,抽出時間などの実験因子を最適化した。リン酸ウラニル及び模擬鉱石のどちらからも効果的にウランを抽出できることを見いだし、SFE法が鉱石中のウラン分析のための前処理法として有用であることを明らかにした。

Supercritical fluid extraction (SFE) method using supercritical CO$$_2$$ fluid containing a complex of HNO$$_3$$-tri-$$n$$-butyl phosphate (TBP) as an extractant was applied to extract uranium from a several uranyl phosphate compounds and simulated uranium ores. Extraction method consisting of a static and a dynamic extraction processes was established and experimental condition such as pressure, temperature, and extraction time were optimized. It was found that uranium could be efficiently extracted from both of the uranyl phosphates and simulated ores by the SFE method and then it was demonstrated that SFE was useful as a pretreatment method for uranium analysis in ores.

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パーセンタイル:76.03

分野:Chemistry, Analytical

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