Extraction of lanthanides from nitric acid solution using isobutyl-BTP/ionic liquid system

分类： 核科学技术 >> 核材料与工艺技术 提交时间： 2023-06-18 合作期刊: 《Nuclear Science and Techniques》

MA Guo-Long YUAN Wei-Jin DONG Zhen MA Sheng-Gu ZHAO Long WEI Yue-Zhou

摘要： Extraction behavior of lanthanides (La, Eu, Dy, Lu) from HNO3 solution was studied using a novel extraction system with hydrophobic ionic liquid being diluent and isobutyl-BTP being extractant. Compared with that in isobutyl-BTP/cyclohexane extraction system, application of ionic liquid as the extracting phase provided unprecedented enhancement of the extraction performance of isobutyl-BTP for lanthanides. It was found that the isobutyl-BTP/[Cnmim][NTf2] extraction system is favorable to get good extraction at low acidity condition (isobutyl-BTP/ [Cnmim][NTf2] (n=2, 6, 8) systems, isobutyl-BTP/[C2mim][NTf2] extraction system provides the best extraction performance and fastest extraction kinetics within 5 min towards Dy3+. The extraction is spontaneous endothermic and temperature is good for extraction. The transfer of lanthanides, in isobutyl-BTP/[C2mim][NTf2] extraction system, proceeded via a cation exchange mechanism, in contrast to extraction of neutral complex in the cyclohexane system.

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