利用水相酸度可控的恒定界面池，研究了在２９８±０．５Ｋ下２－乙基己基膦酸单（２－乙基己基）酯－加氢煤油Ｎａ＿２ＳＯ＿４体系萃取钇的动力学，以及在动力学坪区，Ｙ~（３＋）离子浓度、萃取剂浓度、酸度及水相ＳＯ和Ｃｌ－离子浓度对萃取反应速率的影响，并探讨了可能的萃取机理。实验结果表明，萃取过程为扩散和化学反应混合控制过程。在动力学坪区，萃取过程的速率决定步骤发生在两相界面处。 The kinetics of extraction of yttrium with 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester-hydrogenated kerosene Na_2SO_4 system at 298 ± 0.5 K was studied using a constant interface cell with controlled aqueous phase acidity. Kinetics Ping District, Y ~ (3 +) ion concentration, extractant concentration, acidity and aqueous SO and Cl- ion concentration on the extraction reaction rate, and discussed the possible extraction mechanism. The experimental results show that the extraction process is controlled by diffusion and chemical reaction. In the dynamical Ping area, the rate-determining step of the extraction process takes place at the two-phase interface.