摘要
通过高温固相反应,以铈作为铀的模拟元素,在1 300℃下保温2h合成了钙钛矿基人造岩石固化体。采用XRD对固化体进行物相分析,同时采用MCC-1静态浸泡法及美国PCT粉末浸泡法对不同铈核素包容量的固化体进行浸出性能研究。结果表明,Ce在钙钛矿人造岩石固化体中的包容量低于质量分数18.94%,约为0.15～0.2个结构单位。Ce元素的掺入起到了促进烧结和稳定钙钛矿晶格的作用,当固化体中Ce的荷载量高达35.04%时,Ca元素的90d浸出浓度已超出检测限而未测得,累积浸出分数低至1.87×10-5 cm;Ce元素的90d浸出率和累积浸出分数低至0.27×10-8cm.d-1和6.55×10-7 cm,比玻璃固化体浸出率低了2～3个数量级,说明钙钛矿固化体具有良好的化学稳定性,且当铈核素掺量接近钙钛矿最大包容量时固化体结构最稳定,抗浸出性能最好。
Using high temperature solid-state method,simulating uranium with cerium,the Ce-doped synroc perovskite has been synthesized at 1 300 ℃ with heat preservation 2 h.The phase composition has been investigated by XRD.Anti-leaching performance has also been researched with MCC-1 and the Product Consistency Test.Results show that synroc perovskite can load cerium less than 18.94%,which is about 15%~20%（mol%） structure unit.The incorporation of Ce has promoted sintering and made the perovskite crystal lattice more stable.While the synroc loads as high as 35.04% weight of cerium,the accumulated leaching fraction of Ca is only 1.87×10-5 cm in 90 days,the leaching rate and accumulated leaching fraction of Ce are only 0.27×10-8 cm·d-1,6.55×10-7 cm in 90 days.The results indicate that the perovskite solidification has excellent chemical durability,and when the dosage of nuclide cerium is close to the saturation capacity of perovskite,the leaching performance is the best.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2011年第9期16-20,共5页
Journal of Wuhan University of Technology
基金
国家自然科学基金(10976023)
西南科技大学国防重点学科实验室开放基金(08zxnp05)
西南科技大学重点项目(07XZJ002)
关键词
钙钛矿
铈
铀
固化
浸出性能
perovskite
cerium
uranium
immobilization
leaching performance
