自蔓延高温合成法固化高放射性核废料  

SELF-PROPAGATING HIGH-TEMPERATURE SYNTHESIS FOR THE IMMOBILIZATION OF HIGH-LEVEL RADIOACTIVE WASTE

作　　者：张瑞珠[1] 

机构地区：[1]华北水利水电学院

出　　处：《硅酸盐学报》2008年第10期1484-1487,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(20476008);河南省高校科技创新人才支持计划(2008HASTIT015)资助项目。

摘　　要：用新型氧化剂——三氧化铬(CrO3)自蔓延高温合成了含锶核素(Sr2+)的钙钛矿固化体,分析了自蔓延高温反应的理论,并用X射线衍射、扫描电子显微镜和粉末浸出等分析了合成产物的物相组成、微观结构及浸出率。结果表明:用CrO3作氧化剂,可提高反应的绝热燃烧温度,使合成反应完全在液相下完成,有利于生成致密均匀的固化体;固化体浸出率低,皆小于10mg/(m2?d),化学稳定性好,能长期稳定地处理高放射废物。Using chromium trioxide（CrO3） as an oxidant, a perovskite structure compound with Sr^2＋ was synthesized by the self-propagating high-temperature synthesis （SHS） process. The phase, microstructure and leaching rate of the products were investigated by using X-ray diffraction, scanning electron microscopy and product consistency test powder immersion analysis. The foundation of the SHS theory was discussed. The results show that using CrO3 as oxygen agent can enhance the absolute combustion temperature Tad and lead to the reaction occuring in a liquid stage. As a result, the density and uniformity of the product was improved and the leaching rates were less than 10 mg/（m^2·d）, which indicates that they can hold high level radioactivity wastes in a stable way.

关 键 词：三氧化铬 自蔓延高温合成 固化 钙钛矿 浸出率 

分 类 号：TF124.32[冶金工程—粉末冶金]