HDEHP及其为载体的乳化液膜提取铀（VI）的动力学研究

KINETICS ON THE EXTRACTON OF URANIUM(VI)WITH HDEHP AND LIQUID SUKFACTANT MEMBRANES CONTAINING HDEHP AS A MOBILE CARRIER

用恒界面池法研究了二（２－乙基己基）磷酸（ＨＤＥＨＰ）－环己烷和以ＨＤＥＨＰ为载体的乳化液膜从硫酸介质中提取铀（ＶＩ）的动力学。通过分析水相组成、有机相或液膜组成、搅拌器转速和温度对提取速率的影响，分别得出了ＨＤＥＨＰ萃取和乳化液膜提取铀（ＶＩ）的速率规律。并对两种过程的提取机制进行了比较和讨论。研究表明：溶剂萃取过程属扩散控制；液膜提取过程属化学反应控制。

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.