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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。
The purification simulation and experimental study of metallic uranium by rotating magnetic field were carried out. Two types of crucibles with and without core were adopted. The migration and polymerization of inclusions in uranium melt were compared and analyzed. The experiment of electromagnetic purification was optimized. According to the distribution of melt flow rate, the migration and collisions of inclusions and the simulation results, it is known that the inclusions can collide and grow under the action of rotating magnetic field. The collisional polymerization mainly concentrates in the core region of uranium melt. Adding crucible core to promote the inclusion of the melt collision and polymerization growth, making it easier to remove floating. The use of rotating magnetic field to purify uranium metal, inclusions in the melt with a cylindrical core crucible melt collision aggregation effect and impurity removal was significantly better than the non-core cylindrical crucible.