U(OH)_x~(4-x)-H~+的离子交换平衡

ION EXCHANGE EQUILIBRIUM OF U(OH)_x~(4-x)-H~+ SYSTEM

摘要: 本文指出了一种离子交换体系的两相中有U(Ⅳ)存在时的酸度研究法。测定了与0.18-0.27NHCl平衡的磺酸型交换树脂中U(Ⅳ)的平均价n_(U(Ⅳ))为2.8、H~+浓度RH_(U(Ⅳ))为0.15当量/升树脂床,U(Ⅳ)主要U(OH)~(3+)存在;0.50NHCl时,n_(U(Ⅳ))为3.6,RH_(U(Ⅳ))减为0.10当量/升例脂床,UCl~(3+)仅占树脂中U(Ⅳ)总量的5％以下。讨论了不同U(Ⅳ)浓度时两相中的酸度关系,得出了适当高的溶液酸度有利于RH_(U(Ⅳ))的减低的结论并给予了解释。

Abstract: A method for the investigation of the concentration of H+,coexist-ing with U(Ⅳ) in two phases of ion exchange equilibrium system is suggested. The average valance of U(Ⅳ),nu(IV) and the H+ concentration RHu(IV) in sulfate-type ion exchange resin equilibrated with 0.18-0.27N HC1 are determined to be 2.8 and 0,15N/1·bed, respectively. U(Ⅳ) exists mainly in the form of U(OH)3+ when 0.50N HC1 is used,nu(Ⅳ) reaches 3.6 and RHu(Ⅳ) is reduced to 0. 10N/1·bed.UCl3 is less than 5% of the total amount of U(Ⅳ) in the resin phase. The dependance of acid concentration in one phase on another under different U(Ⅳ) concentrations is discussed, and it is concluded that moderate acid concentration is suitable for the reduction of RHu(Ⅳ).An explanation is given.