以UF_6水解液为原料制备AUC粉末

Preparation of AUC by Hydrolysis Product of UF_6

以UF_6水解液为原料,采用AUC工艺流程制备AUC粉末。研究了以UF_6水解液为原料制备AUC粉末的主要控制参数,讨论了氟体系制备的AUC粉末与硝酸体系制备的粉末性能间的各种差异。实验结果表明:以UF_6水解液为原料制备AUC粉末时,n(NH_3)/n(U)控制在26～30之间,沉淀时间控制在3～4h较为适宜;按此工艺生产的AUC粉末粒度约为30μm,松装密度为1.2～1.4g/cm^3,组成恒定且质量稳定,重现性好;经分解还原得到的UO_2粉末性能稳定,烧结活性高,烧结密度大于97%T.D.(理论密度)。

The preparation process of AUC by the hydrolysis product of UF6 was described. The equipment and the basic theory of AUC preparation were introduced. The difference between nitric acid system and fluorine system was discussed. The experiment results show that controlling the precipitation time in 3-4 h and the NH3/U ratio in 26-30 are feasible. By this process, the granularity of AUC powder is about 30 μm, the bulk density is about 1.3 g/cm^3 , and the capability of UO2 powder which produced by AUC is excellent. The sinter density is above 97%T. D.