研究了 N,N,N ,N -四丁基己二酰胺 (TBAA)从硝酸介质中萃取铀的机理。通过考察HNO3 浓度、UO2 2 + 浓度、TBAA浓度及温度对铀分配系数的影响 ,得出了萃合物的组成为U O2 (NO3 ) 2 · TBAA,还对 TBAA萃取 HNO3 及铀的反萃取进行了研究 ,并计算出萃取反应的表观平衡常数及热力学函数 ,研究了饱和萃合物的 IR光谱 The mechanism of extracting uranium from nitric acid medium by N, N, N, N - tetrabutyl adipamide (TBAA) was studied. By investigating the influence of HNO3 concentration, UO2 2 + concentration, TBAA concentration and temperature on uranium partition coefficient, the composition of the extract was obtained as U O2 (NO3) 2 · TBAA. The extraction of HNO3 and uranium from TBAA was also carried out The apparent equilibrium constants and thermodynamic functions of the extraction reaction were calculated. The IR spectra of the saturated extract