掺铀榍石人造岩石固化体的制备及其浸出性能  

The Preparation and Leaching Performance of Sphene Synroc Form Doped Uranium

作　　者：滕元成[1] 赵伟[1] 任雪潭[1] 李玉香[1] 吴浪[1] 

机构地区：[1]西南科技大学四川省非金属复合与功能材料重点实验室-省部共建国家重点实验室培育基地,四川绵阳621010

出　　处：《辐射防护》2012年第2期72-76,87,共6页Radiation Protection

基　　金：国防基础科研计划资助项目(B3120110001)

摘　　要：以碳酸钙(CaCO3)、二氧化钛(TiO2)、氧化铝(Al2O3)、氧化硅(SiO2)和硝酸铀酰(UO(2NO3)2.6H2O)为原料,采用固相反应工艺,制备掺铀榍石基人造岩石固化体。借助X射线衍射(XRD)、扫描电子显微镜(SEM)等分析手段,研究固化体的烧结温度、物相组成、U元素的浸出性能等。结果表明,掺铀榍石基人造岩石固化体的较佳烧结温度是1 260℃;榍石能很好地固溶U形成榍石固溶体;配方化学式为Ca095U0.05Ti0.9Al0.1SiO5、Ca092U0.04Ti0.9SiO5固化体,28天90℃的浸出率分别为7.0×10-10m.d-1、9.5×10-10m.d-1,其归一化浸出率分别是2.10×10-3g.m-2.d-1、1.76×10-3g.m-.2d-1。The sphene synroc form doped uranium was prepared by solid-state method,using calcium carbonate（CaCO3）,titanium dioxide（TiO2）,alumina（Al2O3）,silica（SiO2） and uranyl nitrate [UO2（NO3）2.6H2O] as raw materials.The sintering temperatures,composes from crystals,and leaching rates of uranium of the synroc forms,were studied by means such as X-ray diffraction（XRD） and scanning electron microscope（SEM）.The results indicate that the ideal sintering temperature of the synroc form is 1 260 ℃.The sphene can dissolve commendably uranium and come into being sphene solution.The leaching rates of uranium of synroc forms,for the formulas of Ca095U0.05Ti0.9Al0.1SiO5 and Ca092U0.04Ti0.9SiO5,are 7.0×10-10 m.d-1 and 9.5×10-10 m.d-1 respectively;Their unitary leaching rates of uranium are 2.10×10-3 g.m-2.d-1 and 1.76×10-3 g.m-2.d-1 respectively at 90 ℃,42 day.

关 键 词：榍石 固化体 烧结温度 浸出率 

分 类 号：TL941[核科学技术—辐射防护及环境保护]