化学学报 ›› 1994, Vol. 52 ›› Issue (11): 1095-1099. 上一篇    下一篇

研究论文

HEH(EHP)萃取稀土元素时萃取动力学行为的递变规律

孙都成   

  1. 新疆大学化学系
  • 发布日期:1994-11-15

The rule of transition of extraction kinetics behavior of rare earth elements with HEH(EHP)

SUN DUOCHENG   

  • Published:1994-11-15

采用恒界面池法研究了2-乙基己基2-乙基己基膦酸[HEH(EHP),P~5~0~7]在盐酸介质中萃取稀土元素时萃取动力学行为的递变规律,讨论了稀土元素分配比(D)和分离因数(β)随时间变化的规律,并测算出正向萃取速率常数(k~f)和逆向萃取速率常数(k~b).发现了萃取动力学中萃取速率常数的"四分组效应","斜W效应"和"钆断"现象,提出利用动态萃取体系分离稀土元素

关键词: 盐酸, 稀土元素, 速率常数, 萃取动力学, 乙基己基膦酸

On the basic theory of extration kinetics, the rule of transition of extration kinetics behavior of rare earth elements with 2-Et hexyl 2-Et hexyl phosphonic acid [HEH(EHP), P507] has been studied using stirred Lewis' cell. The transformation rules of distribution ratio and separation factor of rare earth elements with time are discussed. The forward rate constant (kf) and the backward rate constant (kb) are measured. The "tetrad effect", the "oblique W effect" and the "gadolinium break" phenomenon of the rate constants have given for the first time in extration kinetics.

Key words: HYDROCHLORIC ACID, RARE ELEMENT, RATE CONSTANTS, EXTRACTION KINETICS

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