二(2-乙基己基)亚砜从硝酸介质中萃取铀(Ⅵ)的动力学研究

KINETIC STUDY ON THE EXTRACTION OF URANIUM(Ⅵ) WITH DI(2-ETHYLHEXYL)SULFOXIDE FROM NITRIC ACID MEDIA

摘要: 采用恒界面池法研究了二(2-乙基己基)亚砜(DEHSO)从稀硝酸介质中萃取铀(Ⅵ)的动力学行为。结果表明,在该条件下,DEHSO萃取铀(Ⅵ)的过程为扩散控制。硝酸根浓度是萃取过程重要动力学因子。萃取动力学方程为:R=K_fAUO_2~+H~+~(-0.33)NO_3~-~(2·16)DEH-SO~(0.63)。萃取速率常数K_f为7.90×10~(-2)m·s~(-1)·l~(2.5)·mol~(-2.5)萃取表观活化能为0.9KJ·mol~(-1)。

Abstract: The kinetic study on the extraction of uranium (Ⅵ)with di(2-ethylhexyl)-sulfoxide from nitric acid media is investigated using an improved constant interfacial area cell. Results demonstrate that the extraction process is controlled by diffusion under the present experimental conditions. The extraction rate expression obtained is:The rate constant of Kf is evaluated as 7.9×10-2m·12.5 ·s-1·mol-2.5, and the apparent active energy as 0.9kJ·mol-1.