氟化物熔盐体系稀土钕电解槽出炉过程数值模拟

以8 kA稀土电解槽的出炉装置为研究对象,根据实际生产中稀土电解出金属情况,建立模型进行数值模拟,分析得出抽吸管内流体的流动特性:金属液能够从两边缝隙以较快流速流过挡块,在挡块上方形成对称的涡流,随着金属液和电解质液不断进入管道,大量金属液集中停留在挡块上方,少量金属液和气体以气泡和絮状掺杂在上方电解质液中,达到稳定后电解质不再进入吸管;对比装置中吸管入口处锥形挡块和圆柱挡块吸取金属液过程流场的变化,得出使用锥形挡块进行稀土金属出炉时,挡块上方形成的涡流更小,金属液分布更集中;分析不同直径的锥形挡块对流场的影响,得出挡块直径与电解槽接收器内径比为19/70时金属液流动更均匀。

Numerical Simulation of Discharge Process of Rare Earth Neodymium Electrolyzer in Fluoride Molten Salt System

Taking the discharging device of 8 kA rare earth electrolyzer as the research object,according to the actual production of rare earth electrolysis metal,the model was established to simulate the flow characteristics of the fluid in the suction pipe.The fluid flow in the suction pipe could flow through the baffle at a faster speed from both sides of the gap,forming symmetrical eddy current above the baffle,along with the metal.The liquid and electrolyte continuously entered the pipeline,a large number of metal liquid concentrated on the top of the block,a small amount of metal liquid and gas mixed with bubbles and flocs in the above electrolyte solution,and the electrolyte no longer entered the pipette after stabilization.The flow field changes of the conical and cylindrical baffled at the entrance of the suction pipe in the suction device were compared.It is concluded that the eddy current above the baffle is smaller and the liquid metal distribution is more concentrated when the conical baffle is used to discharge rare earth metals.The influence of tapered baffles with different diameters on the flow field is analyzed.It is concluded that the flow of liquid metal is more uniform when the ratio of baffle diameter to the inner diameter of the receiver is 19/70.