Sr05Zr2(PO4)3-(Ce,Sm)PO4 复相陶瓷核废物固化体的制备及化学稳定性
Preparation and Chemical Stability of Sr0.5Zr2(PO4)3-(Ce,Sm)PO4 Multiphase Ceramic Nuclear Waste Forms
刘缘 1范林杰 1刘昆奇 1刘蝶 1宋江 1刘吉 1王军霞1
作者信息
- 1. 西南科技大学材料与化学学院,绵阳 621010
- 折叠
摘要
为同时固化高放废物中的模拟放射性核素Sr、Ce和Sm,采用一步微波烧结工艺成功制备了 Sr0.5Zr2(PO4)3-(Ce,Sm)PO4复相磷酸盐陶瓷固化体,采用XRD、Raman、SEM-EDS和密度表征研究了其物相组成、微观结构以及致密性,并利用PCT法评估了化学稳定性.结果表明:Sr0.5Zr2(PO4)3相和(Ce,Sm)PO4独居石相兼容性好,两相间不发生相互反应;所制备的复相陶瓷固化体晶粒尺寸小,相对密度高于96％,改变Sm/Ce比对固化体的微观结构和致密性无明显影响;PCT测试结果表明Sr、Ce和Sm的元素归一化元素浸出率都较低,与单相磷酸盐陶瓷固化体相比,复相磷酸盐陶瓷固化体具有较为优异的化学稳定性.
Abstract
In order to simultaneously immobilize the simulated radionuclides Sr,Ce,and Sm in high-level radioactive wastes,Sr0.5Zr2(PO4)3-(Ce,Sm)PO4 multiphase phosphate ceramic waste forms were successfully prepared in this paper by a one-step microwave sintering process.The phase composition,microstructures and density were investigated by XRD,Raman,SEM-EDS and densitometry,respectively.Meanwhile,the chemical stability was evaluated using the PCT method.The results show good compatibility between the Sr0.5Zr2(PO4)3 phase and the(Ce,Sm)PO4 monazite phase,with no mutual reactions occurring between the two phases.The prepared multiphase ceramic waste forms exhibit small grain size and a relative density exceeding 96％,with no significant impact on microstructure or density observed with changes in the Sm/Ce ratio.PCT test results show that the elemental normalized leaching rates of Sr,Ce and Sm are all low-level,demonstrating superior chemical stability compared to single-phase phosphate ceramic forms.
关键词
Sr0.5Zr2(PO4)3-(Ce,Sm)PO4复相陶瓷固化体/微波烧结/致密性/化学稳定性Key words
Sr0.5Zr2(PO4)3-(Ce,Sm)PO4 multiphase ceramic waste forms/Microwave sintering/Density/Chemical stability引用本文复制引用
基金项目
国家自然科学基金面上项目(12275226)
国家级大学生创新创业训练计划(202210619010)
出版年
2024
NETL
NSTL
万方数据