摘要
为制备高温气冷堆用燃料致密UO2核芯,对传统的溶胶-凝胶法进行优化和改进。主要对改进后的外胶凝工艺的湿法部分进行介绍,包括U3O8粉的溶解即欠酸硝酸铀酰(ADUN)溶液的制备、胶液的制备、胶液的分散和胶凝及凝胶球的陈化、洗涤和干燥等,并对湿法过程的机理进行了探讨。采用这一工艺,所得重铀酸铵微球的球形度好、尺寸分布均匀且具有良好空隙结构,经过后续的干法工艺如焙烧、还原和烧结,可制备出合格的高温气冷堆用燃料致密UO2核芯。
In order to prepare the dense uranium dioxide （UO2） kernel for high temperature gas-cooled reactors （HTGR） fuel, the conventional sol-gel processes are optimized and modified. The wet process of modified external gelation of uranium （EGU） is introduced, which includes the dissolution of U3Os, i.e. the preparation of acid-deficiency uranyl nitrate, preparation of broth solution, casting and gelation of broth solution and aging, washing and drying of the gelled spheres, and etc. The mechanism of wet process of EGU is also discussed. With the optimized wet process, the ammonium diuranate （ADU） microspheres with good sphericity, uniform diameter and perfect porous structure are prepared. After the subsequent treatments of dry processes such as calcination, reduction and sintering, the eligible dense UO2 kernels for HTGR fuel are manufactured.
出处
《核动力工程》
EI
CAS
CSCD
北大核心
2012年第4期40-43,共4页
Nuclear Power Engineering
基金
国家重大专项子课题基金(2008ZX06901-013)
关键词
溶胶-凝胶法
高温气冷堆
外胶凝法
二氧化铀
Sol-gel process, HTGR, External gelation of uranium, Uranium dioxide
