硝酸钡预处理高放废液玻璃固化体结构和抗浸出性能研究
Structure and Leaching Resistance of Ba(NO3)2-Pretreated High-Level Liquid Glass Waste Form
宁海霞 1安红娜 1雷杰 2王宾 2吴浪2
作者信息
- 1. 绵阳职业技术学院,绵阳 621000
- 2. 西南科技大学材料与化学学院,绵阳 621010
- 折叠
摘要
为提高硼硅酸盐玻璃对硫的包容能力,采用Ba(NO3)2将模拟高硫高钠废液中的SO42-转变为BaSO4,再利用熔融法制备硼硅酸盐玻璃固化体,研究了模拟高放废液掺量对玻璃固化体结构和抗浸出性能的影响.结果表明:采用Ba(NO3)2对模拟高硫高钠废液进行预处理后,废物包容量达到23％(质量分数)仍未发生分相;掺入模拟高放废液的玻璃固化体中的Na、B、Si元素归一化质量损失比纯硼硅酸盐玻璃低一个数量级,随着模拟高放废液掺量增加玻璃固化体抗浸出性能无明显变化.11B和29Si核磁共振谱分析表明,模拟高放废液的掺入使部分BO3结构转变为BO4结构,玻璃网络结构有所增强.
Abstract
In order to increase solubility of sulfur in borosilicate glass,SO4 ions in simulated high-level liquid waste(HLLW)with relatively high content of sulfur and sodium were pretreated by adding Ba(NO3)2 solution,and then borosilicate glass waste form was prepared by melt-quenching method.The effects of pretreated HLLW on the structure and leaching resistance were mainly investigated.The results show that the waste loading can be increased to 23％(mass fraction)without phase separation after the Ba(NO3)2 pretreatment.The normalized elemental mass loss of Na,B and Si of the HLLW-loaded samples are one order of magnitude lower than that of the pure borosilicate glass.Furthermore,the leaching resistance of the glass waste form has no significant change with increasing HLLW content.11B and 29 Si MAS NMR analyses indicate that part of BO3 transforms into BO4 structural units and a polymerization of the glass network occurs after HLLW addition.
关键词
高放废液/硼硅酸盐玻璃/硝酸钡/硫酸盐/核磁共振/抗浸出性能Key words
high-level liquid waste/borosilicate glass/barium nitrate/sulfate/nuclear magnetic resonance/leaching resistance引用本文复制引用
基金项目
国家自然科学基金(12375316)
绵阳职业技术学院校级科研项目(2022)(MY22YB01)
出版年
2024
国家科技期刊平台
NSTL
万方数据