二次自蔓延高温合成钙钛矿固化^(90)Sr  

Synthesis of Perovskite by Double-SHS for Immobilization of ^(90)Sr

作　　者：张瑞珠[1,2] 仝玉萍[1] 杨丽[3] 郭志猛[2] 李勇[1] 

机构地区：[1]华北水利水电学院机械学院,河南郑州450011 [2]北京科技大学材料科学与工程学院,北京100083 [3](徐州工程学院机电工程学院,江苏徐州221008

出　　处：《核化学与放射化学》2009年第4期237-241,共5页Journal of Nuclear and Radiochemistry

基　　金：国家自然科学基金资助项目(20476008);河南省高效科技创新人才支持计划(2008HASTIT015);华北水利水电学院高层次人才启动基金(No.200820)

摘　　要：采用二次自蔓延高温合成(SHS)技术制备钙钛矿固化高放废物90Sr,通过XRD,SEM和PCT粉末浸泡法,研究了钙钛矿固化体的微观组织、浸出率以及其对高放废物90Sr的最大包容量。结果表明,固化体样品密度高、孔隙率小,浸出率都小于0.1 g/(m2.d),对SrO的包容量可达36%(质量分数);表明自蔓延高温合成的钙钛矿人造岩石固化体化学稳定性好、包容量大,是固化高放废物的理想固化体。Perovskite synroc samples containing high level radioactive waste （HLW） ^90Sr were synthesized by double self-propagating high-temperature synthesis （SHS） and their properties, including leach rate, density, microhardness and the maximum content of high level radioactive waste in the samples, were tested by X-ray diffraction, scanning electron microscope and PCT powder immersion analysis. The results indicate that the high density Sr^2＋-CaTiO3 composite are formed, and leaching rates are less than 0.1 g/（m^2·d）, and the maximum SrO content in the composite can reach 36 % in mass. It can be concluded that the perovskite synroc is a perfect material to immobilize HLW.

关 键 词：钙钛矿 高放废物(HLW) 固化 自蔓延高温合成 浸出率 

分 类 号：TF124.32[冶金工程—粉末冶金]