Abstract: KINETICS ON THE EXTRACTON OF URANIUM（VI）WITH HDEHP AND LIQUID SUKFACTANT MEMBRANES CONTAINING HDEHP AS A MOBILE CARRIERZHOU ZUMING；DU HUIFANG；WANG HAIFANG；LUO JI（Department of modern Physics，Fudan University，Shanghai, 200433）ABSTRACT The kinetics of extraction of uranium（VI）from sulfuric acid solutions with HDEHP in cyclohexane and liquid surfactant membranes containing HDEHP as a mobile carrier is investigat-ed using Lewis cell technique. By analyzing the effects of stirring speed，temperature and the com-ponent of aqueous phase，organic phase or membrane phase on the rates of extraction of uranium(VI），the rate equations are obtained．The mechanisms of extraction for two processes are dis-cussed．The studies show that the solven extraction is diffusion-controlled and the liquid mem-brane extraction is chemical reaction-controlled.Key words Uranium Extraction Kinetics Di-（2-ethylhexyl） phosphoric acid Liquid membrane.