稀土电解槽真空吸铸流场仿真分析

Flow Field Simulation Analysis of Vacuum Suction Casting for Rare Earth Electrolyzer

对真空吸铸法抽吸稀土金属过程进行分析,选定8 kA电解槽工艺参数,建立流道的几何模型并确定其计算流体力学模型;通过模拟分析金属钕的出炉过程,发现液体金属钕在竖直管内上升过程中尾端呈环状流,过弯管进入水平管时金属液速度较大。研究吸管插入位置对流场的影响,分析得出吸管偏离中心会使得金属液抽取不均匀,电解质流失过多;吸管插入深度太大时易造成管道堵塞,所以在加载负压为-0.05 MPa的情况下,插入深度为离底30 mm时较为合适。对比不同的抽吸管的出炉效果,使用大圆弧抽吸管时金属钕液的出炉效果最佳。

The process of extracting rare earth metal by vacuum suction casting was analyzed.The technological parameters of 8 kA electrolyzer were selected,the geometric model of the flow channel was established and the computational fluid dynamics model was determined.It is found that liquid neodymium flows circularly at the tail end during the rising process in the vertical tube,and the liquid metal velocity is larger when passing through the elbow and entering the horizontal tube.The influence of suction tube insertion position on flow field was studied.It was concluded that the deviation of suction tube from the center would lead to uneven extraction of liquid metal and excessive electrolyte loss.The overdeeper of the insertion depth would cause the pipeline blockage,so when the negative pressure was-0.05 MPa,the insertion depth was 30 mm from the bottom.Compared with different suction pipes,the best discharge effect of neodymium liquid is obtained when using large arc suction pipe.