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本工作研究了十五种不同结构的冠醚在硝酸介质中对UO_2(NO_3)_2的革取。结果表明:二环已基系列的冠醚对UO_2(NO_3)_2络合萃取的性能较其他冠醚为好,其中以二环己基—24冠—8和二环己基—27—冠—9对UO_2(NO_3)_2的萃取性能最好。还研究了水相酸度、平衡时间、反萃性能及铀浓度等因素对萃取的影响。经实验测定:二环己基—30—冠—10、二环己基—27—冠—9、二环己基—24—冠—8和二环己基—21—冠—7与UO_2(NO_3)_2所形成的萃合物组成比皆为1:1。所计算出的萃取平衡常数分别为:K_(DCH18C?)=11.5;K_(DCH21C7)=11.2;K_(DCH24C?)=18.2;K_(DCH27C?)=14.2;K_(DCH30C10)=12.9。
In this work, the extraction of UO_2 (NO_3) _2 from 15 different crown ethers in nitric acid medium was studied. The results showed that the dianclohexyl series of crown ethers had better performance for the complex extraction of UO_2 (NO_3) _2 than other crown ethers, of which dicyclohexyl-24-crown-8 and dicyclohexyl-27-crown-9 UO_2 (NO_3) _2 has the best extraction performance. The effects of aqueous phase acidity, equilibrium time, stripping performance and uranium concentration on extraction were also studied. It has been experimentally determined that dicyclohexyl-30-crown-10, dicyclohexyl-27-crown-9, dicyclohexyl-24-crown-8 and dicyclohexyl-21-crown-7 and UO 2 (NO 3) The formation of the complex composition ratio of 1: 1. The calculated equilibrium constants for extraction are: K DCH18C? = 11.5; K DCH21C7 = 11.2; K DCH24C? = 18.2; K DCH27C? = 14.2; K DCH30C10 = 12.9.