研究了在不同稀释剂中石油亚砜(PSO)对铀()的萃取。其萃取能力在不同稀释剂中由强到弱的顺序为:苯、甲苯、环己烷、正庚烷、煤油、四氯化碳、氯仿。求出了萃取反应的各热力学函数变化值。建立了萃取平衡常数与稀释剂物理参数间的经验方程。考察了硝酸浓度、盐析剂浓度、配位阴离子浓度对萃取平衡的影响,并用红外光谱对萃取机理进行了研究。 The extraction of uranium () from petroleum sulfoxide (PSO) in different diluents was studied. Its extraction ability in different diluents from strong to weak order: benzene, toluene, cyclohexane, n-heptane, kerosene, carbon tetrachloride, chloroform. The thermodynamic functions of the extraction reaction were calculated. The empirical equation between the equilibrium constant of extraction and the physical parameters of diluent was established. The effects of nitric acid concentration, salting-out agent concentration and coordination anion concentration on the extraction equilibrium were investigated. The extraction mechanism was studied by infrared spectroscopy.