Abstract

The technology of fractionation of trans-plutonium elements (TPEs) and REEs with the use of 0.15 M TODGA (tetraoctylamide of diglycolic acid) + 5% n-decanol in Isopar-M as extractive agent was tested on high-activity raffinates characteristic of high-activity wastes formed in processing of spent fuel from nuclear power plants. The mixture satisfies the explosion-and-fire safety requirements and possesses the necessary hydrodynamic characteristics. A >99.99% recovery was reached in the extraction stage. In the re-extraction stage of TPEs, it was possible to provide their nearly full purification to remove yttrium, with 70% of lanthanides remaining in the TPE fraction. All the metals were quantitatively recovered from the organic phase in the stage of REE re-extraction. The increase in the degree of separation of TPEs and REEs is provided by lowering the concentration of the extractive agent (TODGA). The radiation hardness of the mixture was examined.

中文翻译：

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在“轻”稀释剂中使用 TODGA 萃取剂分离 HAW 的方案的开发和验证

摘要

使用 0.15 M TODGA（二乙醇酸四辛基酰胺）+ 5% n-分馏反式钚元素 (TPE) 和 REE的技术使用 Isopar-M 中的癸醇作为萃取剂，在处理核电厂乏燃料时形成的高活性废物的高活性残液特征上进行了测试。该混合物满足防爆和防火安全要求并具有必要的流体动力学特性。在萃取阶段达到了 >99.99% 的回收率。在 TPE 的再提取阶段，可以提供它们几乎完全纯化以去除钇，其中 70% 的镧系元素保留在 TPE 部分中。在稀土元素再萃取阶段，所有金属均从有机相中定量回收。通过降低萃取剂 (TODGA) 的浓度，可以提高 TPE 和 REE 的分离程度。检查混合物的辐射硬度。