Abstract In the present study, an emulsion liquid membrane (ELM) system containing 2-Thenoyltrifluoroacetone (TTA) as a carrier was applied for extraction of uranium from dilute aqueous solutions. The stability of the ELM globules was modified by adding a polymeric stabilizer (Polyisobutylene or PIB) to the membrane phase. Several operational parameters such as surfactant concentration, stirring speed, treat ratio and the internal to membrane phase volume ratio were optimized for achieving the maximum uranium extraction with minimum emulsion breakage and swelling. The results showed that the best extraction efficiency and emulsion stability is obtained at 2 wt% of the surfactant, 1.5 wt% PIB, stirring speed of 300 rpm, treat ratio of 1:10 and internal to membrane phase volume ratio of 1:1. With these conditions, the extraction efficiency of 95.2% was obtained within 5 min and the measured values of emulsion breakage and swelling were 0.39% and 0%, respectively. The optimized emulsion formulation and operating conditions were used for continuous extraction of uranium in a horizontal mixer-settler. The ELM performance in uranium extraction was also compared to the conventional solvent extraction method with the same organic solvent and extractant in batch and continuous modes.

中文翻译：

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操作条件对乳化液膜脱铀系统稳定性和效率的影响

摘要 在本研究中，将含有 2-Thenoyltrifluoroacetone (TTA) 作为载体的乳液液膜 (ELM) 系统应用于从稀水溶液中提取铀。通过向膜相中添加聚合物稳定剂（聚异丁烯或 PIB）来改善 ELM 小球的稳定性。优化了几个操作参数，如表面活性剂浓度、搅拌速度、处理比和膜内相体积比，以实现最大的铀提取和最小的破乳和溶胀。结果表明，当表面活性剂为2 wt%、PIB为1.5 wt%、搅拌速度为300 rpm、处理比为1:10、膜内相体积比为1:1时，提取效率和乳液稳定性最佳。在这些条件下，提取效率为 95。5分钟内获得2％，破乳和溶胀的测量值分别为0.39％和0％。优化的乳液配方和操作条件用于在卧式混合沉降器中连续提取铀。还将 ELM 在铀萃取中的性能与使用相同有机溶剂和萃取剂在间歇和连续模式下的常规溶剂萃取方法进行了比较。