硝酸介质中二环己基18-冠-6对锶的萃取  

Solvent Extraction of Strontium From Nitric Acid Solution by Dicyclohexyl-18-Crown-6

作　　者：范芳丽[1] 范富有[1,2] 白静[1] 田伟[1,2] 王洋[1,2] 吴晓蕾[1] 殷小杰[1] 秦芝[1] 

机构地区：[1]中国科学院近代物理研究所,兰州730000 [2]中国科学院大学,北京100049

出　　处：《核化学与放射化学》2013年第4期235-240,共6页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(No.20901080)

摘　　要：利用冠醚二环己基-18-冠-6(DCH18C6)作为萃取剂在硝酸介质中对锶的萃取性能进行了系统研究,考察了稀释剂、硝酸浓度、振荡时间、温度对锶萃取的影响,结果表明,该萃取体系与硝酸的浓度有关,当萃取剂浓度为0.01mol/L,以1,1,2,2-四氯乙烷为稀释剂,硝酸浓度为1mol/L时,锶的萃取率可高达92%左右,利用纯水作为反萃剂,反萃率可达(99.56±1.7)%左右。该萃取反应动力学比较快,可在10min达到平衡,热力学实验表明该萃取反应是一个放热反应。同时选择性萃取实验结果表明,冠醚二环己基-18-冠-6能有效地从多种离子共存的体系中选择性地萃取锶。Solvent extraction of strontium with dicyclohexyl-18-crown-6 （DCH18C6） from HNO3 solutions has been investigated. The effect of extraction conditions, such as organic diluents, the concentration of nitric acid, shaking time and temperature was studied. The extraction efficiency of Sr depends on the concentration of HNO3 and the maximal extraction efficiency （about 92%） of Sr is obtained at 1 mol/L HNO3. The back extraction efficiency is about （99.56± 1.7）% using H2O as stripping agent. In kinetics studies, the extraction equilibration can be achieved at 10 min for St. The negative values of AH indicate the exothermic process for extraction of Sr. The selectivity studies show that DCH18C6 is an efficient extractant for strontium ions.

关 键 词：锶 二环己基-18-冠-6 溶剂萃取 

分 类 号：TL241.14[核科学技术—核燃料循环与材料]