Abstract

Studies have been carried out in order to develop new ways to separate Am and Cm in nitrate solutions. It was shown that Am(VI) produced by oxidation of Am(III) by sodium bismuthate in 0.1 and 3.0 M HNO₃ solutions is extracted with 30% tri-n-butyl phosphate solution in Isopar M diluent. Using this extractive agent in a mixture with a synergic additive of 0.1 M of trioctylphosphine oxide with 0.1 M HClO₄ makes it possible to extract into the organic phase up to 90% of the starting amount of Am with not more than 3% of Cm contained in solution. It was found that, upon introduction of Na₄XeO₆·8H₂O into a 0.1 M HNO₃ solution containing Am(III) and NaBiO₃, the solution becomes alkaline (рН ~ 10) and Am(III) is oxidized to Am(IV) to give a stable complex of composition Am(IV)·XeO₆. As a result, Am remains in solution. Sodium bismuthate present in solution is hydrolyzed to give the solid phase Bi₂O₅ by coprecipitation of hydrolyzed Cm(III). Thus, the redox separation of Am(IV) from Cm(III) in the solution formed as a result of the interaction Am(III) with a 0.1 M HNO₃ solution with sodium bismuthate and perxenate it contains is a simpler and more effective way, compared with the developed extractive method.

中文翻译：

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铋和过氧化物离子氧化Am（III）分离硝酸溶液中的and和Cur

摘要

为了开发新方法以分离硝酸盐溶液中的Am和Cm，已经进行了研究。结果表明，AM（VI）在0.1产生通过AM（III）的氧化通过铋酸钠和3.0M的HNO _3种溶液中，用30％三-提取Ñ在ISOPAR中号稀释剂丁基磷酸盐溶液。在与0.1M三辛基氧化膦和0.1M HClO ₄的协同添加剂的混合物中使用这种萃取剂，可以将有机物的萃取率提高到Am起始量的90％，而Cm含量不超过3％在解决方案中。发现将Na ₄ XeO ₆ ·8H ₂ O引入含有Am（III）和NaBiO的0.1 M HNO ₃溶液中_{如图3所示}，溶液变为碱性（R a 10），并且Am（III）被氧化成Am（IV），从而得到组成稳定的Am（IV）·XeO ₆络合物。结果，Am仍然存在。溶液中存在的铋酸钠通过水解Cm（III）的共沉淀进行水解以生成固相Bi ₂ O ₅。因此，由于Am（III）与0.1 M HNO ₃溶液与铋酸钠和过氧化物的相互作用而形成的溶液中Am（IV）与Cm（III）的氧化还原分离是一种更简单有效的方法，与开发的提取方法相比。