阳离子交换法浓缩铀同位素的络合剂选择理论——Ⅱ.UO_2~(2+)被加速传质研究

A THEORY FOR SELECTING THE COMPLEXING AGENT FOR THE ENRICHMENT OF URANIUM ISOTOPES WITH A PROCESS OF CATIONIC EXCHANGE Ⅱ. STUDY ON MASS TRANSFER OF ACCELERATED

摘要: 本文用大孔磺酸型阳离子交换树脂研究并确认了树脂相U(Ⅳ)、Ti(Ⅳ)、Fe(Ⅱ)以及液相中H_2SO_4、HCl、六种羧酸对UO_2~(2+)-H~+交换过程的加速作用。肯定了内扩散系数和滞留时间对应规律的普遍性;明确了阴离子的加速效应次序;用吸附双电层理论解释了阴离子加速传质效应的起因,并对UO_2~(2+)-H~+交换的起始阶段作了理论分析。

Abstract: The accelerative effect on the UO2 2+-H+ exchange process exerted by the presence of U(Ⅳ) or Ti(Ⅳ) or Fe(Ⅱ) in resin phase and H2SO4, HCI and six kinds of carboxylic acid in liquid phase is studied and confirmed with macrorecticular sulfonic ion exchange resin in this paper. The correspondence of inner diffusion coefficient D with detained time is verified as an universal rule; the order of accelerative effect exerted by anionic ion is clarified; the cause of accelerative effect exerted by anionic ion is explained by adsorption double layer theory and theoretical analysis for the initial stage during the UO2 2+-H+ exchange process is given.