大直径UO_2球球形度与尺寸的控制方法

The Control Method of Sphericity and Size for Large Diameter UO_2 Sphere

在溶胶凝胶法制备尺寸范围为2~3 mm、球形度≤1.10的大直径UO2球过程中,对影响UO2球的球形度以及球尺寸的因素进行了试验研究,其中影响UO2球的球形度的因素包括胶凝介质、表面活性剂、胶凝温度和溶胶密度;影响UO2球尺寸的因素包括分散头与载带流液面间的距离、载带流流量及流动稳定性和溶胶流量。最终确立了最佳工艺参数,经过试验验证,制得UO2球尺寸在2~3 mm范围内合格率达到93%以上,球形度小于1.1的比例平均达到89%以上,满足球型反应堆UO2技术要求。

In the preparation process using the sol gel method for the large diameter UO_2 sphere that it is in the size range 2~3mm,spherical degree 1.10 or less,the factors affecting UO_2 sphericity and sphere size were studied,the influencing factors of the UO_2 sphere spherical degree include the gelation medium,the surface active agent,the gel temperature and the sol density;The influencing factors of UO_2 sphere size include the distance between the head of dispersion and the liquid leve of carrier fluid,the quantity and the stability of carrier fluid,and the quantity of the sol.Finally established the optimum process parameters,after the test,obtained UO_2 sphere size in mm（2 ~ 3）within the scope of qualified rate of 93% or more,the proportion of less than 1.1 average sphericity of 89% or more.The requirements of UO_2 ball type reactor technology is met.