摘要
本文探究了放射性废物处置过程环境中的阴离子对水泥固化体中矿物相成分的影响,基于吉布斯自由能最小化原理,通过热力学计算了不同浓度阴离子下水泥固化体中各矿物相成分含量的变化,分析了水泥固化体矿物相成分随阴离子浓度变化的演化过程。计算结果表明,阴离子SO_(4)^(2-)和Cl^(-)对水泥固化体矿物相成分影响较大,会导致水泥固化体完全降解,失去对放射性核素的阻滞作用,NO_(3)^(-)对水泥固化体矿物相成分影响较小,NO_(3)^(-)与水泥固化体矿物相成分反应后会达到一个稳定的平衡状态。本研究结果揭示了处置环境中的阴离子造成水泥固化体降解的演变规律及机制,可为水泥固化体处置安全评价提供数据支撑。
This paper explores the influence of anions in the environment during the disposal of radioactive waste on the mineral phase composition of cemented waste form.Based on the principle of minimization of Gibbs free energy,the changes in the content of each mineral phase component in the cemented waste form under different concentrations of anions were calculated by thermodynamics,and the evolution process of the cemented waste form with the change in anion concentration was analysed.The calculation results show that SO_(4)^(2-)and Cl^(-)have a relatively large impact on the mineral phase composition of the cemented waste form,which will lead to the complete degradation of the cemented waste form and the loss of retardation effect on radionuclides.The impact of NO_(3)^(-)on the mineral phase composition of the cemented waste form is relatively tiny,and a stable equilibrium state will be reached after the reaction between NO_(3)^(-)and the mineral phase composition of cemented waste form.The results of this study reveal the evolution law and mechanism of the degradation of cemented waste form caused by anions in the disposal environment,and can provide data support for the safety evaluation of the disposal of cemented waste form.
作者
樊丽阳
韩旭
赵彦东
孟子贺
王浩
高超
Fan Liyang;Han Xu*;Zhao Yandong;Meng Zihe;Wang Hao;Gao Chao(China Institute for Radiation Protection,Taiyuan,China)
出处
《科学技术创新》
2025年第15期224-228,共5页
Scientific and Technological Innovation
关键词
放射性废物
水泥固化体
矿物相组成
吉布斯自由能
水泥降解
radioactive waste
cemented waste form
mineral composition
Gibbs free energy
cement degradation
作者简介
樊丽阳(1992-),男,本科,助理工程师,研究方向:放射性废物处理处置及安全评价;通讯作者:韩旭(1996-),男,硕士研究生,助理研究员,研究方向:放射性废物处理处置及安全评价。
