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Development of methods for recovering uranium from sludge-like uranium generated in decontamination of metal wastes

金属廃棄物の除染で生成したスラッジからのウラン回収法の開発

大橋 裕介; 田中 祥雄; 綱嶋 康倫; 池田 泰久*

Ohashi, Yusuke; Tanaka, Yoshio; Tsunashima, Yasumichi; Ikeda, Yasuhisa*

金属廃棄物の除染廃液から鉄を含んだスラッジが発生している。これらからウランを回収する方法として、${{it N-cyclohexyl}}$-2-pyrrolidone (NCP)を沈澱剤として用いた方法を検討した。その結果、スラッジを溶解した硝酸溶液からのウラン沈澱率はモル比[NCP]/[U(VI)]=20の条件で97.7%であった。また、Fe, Al, F$$^{-}$$, SO$$_{4}$$$$^{2-}$$の沈澱率は1%以下であり、選択的にウランが沈澱することが分かった。また、沈殿物のか焼物中のU, Fe, Al, F, Sの含有率はいずれもウラン転換原料に求められる基準を満たしており、本手法はスラッジから純度の高いウランを効率的に得られる方法として適用が期待できる。

Sludge-like uranium wastes (SUWs) have been generated with neutralization of acidic aqueous solutions used for decontamination of metal wastes containing a large amount of iron. We have examined the method for recovering uranium from such SUWs using ${{it N-cyclohexyl}}$-2-pyrrolidone (NCP) as a precipitate. As a result, it was found that precipitation ratios (PRs) of uranium in the solutions prepared by dissolving SUWs in HNO$$_{3}$$ is 97.7% at [NCP]/[U(VI)] = 20, and that the PRs of iron, aluminum, fluorine, and sulfate species are less than 1%. This indicates that uranium species are precipitated selectively. The content ratios of U, Fe, Ca, F, and S in the materials after calcining precipitates obtained at [NCP]/[U(VI)] = 20 were in accordance with the conditions of uranium ore concentrate. From these results, it is expected that highly purified uranium can be efficiently recovered from SUWs by using NCP as the precipitant.

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パーセンタイル:38.23

分野:Nuclear Science & Technology

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