Abstract:

Considering the difficulty to recover trace uranium in organic phase, Na₂CO₃ aqueous solution was used to strip uranium, then the amidoxime adsorbents were chosen to enrich uranyl in the aqueous phase. In the stripping part, the kinetics of stripping, the effects of the concentration of Na₂CO₃ and phase ratio on the stripping efficiency were investigated. Then, in the adsorption part, the effects of shaking rate, the mass of adsorbents and the concentration of Na₂CO₃ were studied. After the validation of the recyclable performance of the amidoxime adsorbents, a process for recovering trace uranium in organic waste liquid was proposed.

Key words: amidoxime, (NH₄)₄[UO₂(CO₃)₃], adsorption, organic waste liquid, stripping

摘要：

针对含微量铀的有机废液中铀难以回收的难题, 选择Na₂CO₃水溶液对有机相中的铀进行反萃, 得到碱性含铀水溶液, 并应用偕胺肟基吸附材料进行富集。考察了碳酸盐对有机相中铀的反萃过程中反萃动力学、碳酸钠浓度以及相比的影响, 探究吸附过程中振荡速率、吸附材料使用量、溶液中CO₃^2-浓度等参数的影响, 研究了偕胺肟基吸附材料的重复利用性。在此基础上, 提出了从有机废液中高效富集与回收微量铀的流程。

关键词: 偕胺肟, 三碳酸铀酰铵, 吸附, 有机废液, 反萃