旋转磁场下铀中夹杂物运动行为模拟与实验研究

Simulation and Experimental Study on Movement Behaviour of Inclusions in Uranium Under Rotating Magnetic Field

开展了旋转磁场对金属铀的净化模拟以及实验研究。采用了带芯柱形与无芯柱形两种坩埚,对比分析了铀熔体中夹杂物的迁移与聚合长大,并对电磁净化实验工艺进行了优化。由熔体流场速率分布以及夹杂物的迁移与碰撞模拟结果和实验结果分析可知,夹杂物在旋转磁场作用下能够发生碰撞聚合长大,碰撞聚合主要集中在铀熔体芯部区域。添加坩埚芯促进了熔体中夹杂物碰撞与聚合长大,使之更易上浮去除。采用旋转磁场净化金属铀,带芯柱形坩埚熔体中夹杂物碰撞聚集效果与杂质去除效果明显优于无芯柱形坩埚。

Simulation and experimental study which rotating magnetic field purified metal uranium were developed. And using two kinds of cylindrical crucible with and without core, migration and aggregation growth of inclusions in the melt uranium were contrasted and analyzed. And the experimental technology of electromagnetic purification was optimized. From the simulation results and the experimental results of the melt flow rate distribution and migration and collision of inclusions, it was known that inclusions can produce collision and convergence. The collision polymerization mainly concentrated in the core area of uranium melt. Adding the crucible core promoted inclusion collision and polymerization to make it easilier floating and dislodging. Using rotating magnetic field to purify metallic uranium, inclusion collision and aggregation effect and the removal effect of impurities in melt of cylindrical crucible with core are obviously better those that of cylindrical crucible without core.