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Uranium stripping from tri-n-butyl phosphate by hydrogen peroxide solutions

机译：过氧化氢溶液从磷酸三正丁酯中脱铀

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摘要

The processes of uranium stripping from 30% tri-n-butyl phosphate (TBP) in "odorless" kerosene by H_2O_2 solutions both with and without NH_4OH added were investigated in the temperature range of 20-50 °C and with a volumetric ratio of 1 between the organic and aqueous phases. The uranium was selectively precipitated in the form of uranium peroxide during stripping from the organic phase by hydrogen peroxide. The stripping of uranium increased with increasing H_2O_2 content, increasing temperature and increasing concentration of NH_3 in the range of 0-15 g/L. The use of a heated solution (40 °C) that contained 4 mol H_2O_2/mol U and NH_312 g/L resulted in 99.7% of the uranium being stripped from TBP in the form of uranium peroxide. The uranium peroxide obtained by stripping is a highly pure product that exists in two different hydrated forms: UO_4-4H_2O (92 mass %) and UO_4-2H_2O. The mean particle diameter was 20.75 urn. The effect of hydrogen peroxide on the organic phase was studied by IR spectroscopy. No structural changes in TBP were observed after 30 cycles of extraction/stripping; thus, the use of hydrogen peroxide in this application is unrestricted.
机译：研究了在20至50°C的温度范围内，体积比为1的条件下，通过添加和不添加NH_4OH的H_2O_2溶液从“无味”煤油中的30％磷酸三正丁酯（TBP）汽提铀的过程。在有机相和水相之间。在通过过氧化氢从有机相中汽提期间，铀以过氧化铀的形式选择性地沉淀。在0-15 g / L范围内，随着H_2O_2含量的增加，温度的升高和NH_3浓度的增加，铀的汽提量增加。使用包含4 mol H_2O_2 / mol U和NH_312 g / L的加热溶液（40°C），导致99.7％的铀以过氧化铀的形式从TBP汽提。通过汽提获得的过氧化铀是高纯度的产物，其以两种不同的水合形式存在：UO_4-4H_2O（92质量％）和UO_4-2H_2O。平均粒径为20.75。通过红外光谱研究了过氧化氢对有机相的影响。在提取/剥离的30个循环后，未观察到TBP的结构变化。因此，在该应用中过氧化氢的使用不受限制。

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