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研究了不对称荚醚N,N’ 二甲基二己基 3 氧戊二酰胺(DMDHGA)、N,N’ 二甲基二辛基 3 氧戊二酰胺(DMDOGA)、N,N’ 二甲基二月桂基 3 氧戊二酰胺(DMDLGA)和N,N’ 二甲基二己基 3,6 二氧辛二酰胺(DMDHOA)在HNO3介质中对铀(Ⅵ)、稀土(Ⅲ)和锶(Ⅱ)的萃取行为。结果表明,随着酰胺官能团氮原子上烷基链增大,不对称荚醚萃取性能下降,与铀(Ⅵ)形成的萃合物在烷烃稀释剂中的溶解性增加。分别使用正十二烷、异辛烷和煤油作稀释剂时,DMDOGA萃取铀(Ⅵ)均出现第三相,而DMDHGA,DMDHOA和DMDL GA萃取时均不出现第三相。DMDHGA萃取铀(Ⅵ)和锶(Ⅱ)的分配比及铀(Ⅵ)与锶(Ⅱ)之间的分离系数均比对称荚醚N,N,N’,N’ 四丁基 3 氧戊二酰胺(TBGA)的大,有利于铀(Ⅵ)与锶(Ⅱ)的分离。DMDLGA与铀(Ⅵ)生成1∶1型萃合物;而DMDLGA和DMDOGA与混合稀土(Ⅲ)(组成以氧化物计为27%La2O3,51%CeO2,6%Pr6O11,16%Nd2O3)生成1∶2型萃合物。
The effects of asymmetric pod ether N, N ’dimethyldihexyl 3 oxoglutarate (DMDHGA), N, N’dimethyldioctyl 3 oxoglutarate (DMDOGA), N, N’dimethyl (Ⅵ), rare earth (Ⅲ) and strontium (Ⅱ) in the presence of HNO3 in the presence of DMDLGA and DMDHOA. ) Extraction behavior. The results showed that with the increase of the alkyl chain on the nitrogen atom of the amide functional group, the extraction performance of asymmetric podole decreased, and the solubility of the complex with uranium (Ⅵ) in alkane diluent increased. When n-dodecane, isooctane and kerosene were used as diluent respectively, the third phase was found in the DMDOGA extraction of uranium (Ⅵ), while the third phase was not observed in the extraction of DMDHGA, DMDHOA and DMDL GA. The partition coefficients of uranium (Ⅵ) and strontium (Ⅱ) and the separation coefficients of uranium (Ⅵ) and strontium (Ⅱ) by DMDHGA were all higher than those of symmetrical pods N, N, N ’ Amide (TBGA) is large, is conducive to the separation of uranium (Ⅵ) and strontium (Ⅱ). DMDLGA and uranium (Ⅵ) generate a 1: 1 type complex; and DMDLGA and DMDOGA with a mixed rare earth (III) (composition of 27% La2O3, 51% CeO2, 6% Pr6O11, 16% Nd2O3) : Type 2 Extract.