3kA钕电解槽流场中颗粒受力分析

近年来随着NdFeB永磁的应用发展,对金属Nd质量的要求越来越高,而电解过程碳颗粒运动及溶解对金属质量的影响至关重要。通过理论与数值模拟相结合的方式对流场中不溶于电解液的碳固体颗粒的主要受力类型进行梳理,对其运动轨迹进行数值模拟研究,针对稀土电解槽进行了颗粒-流场的计算及模拟,研究发现曳力及重力是颗粒在电解槽中起主要作用的力。曳力是改变颗粒运动轨迹的影响因素,且曳力随粒径的增大而增大。0.07 mm颗粒粒径是区分主要作用力是重力还是曳力的临界值,颗粒粒径越大,越不利于电解槽得到纯净的Nd单质。对进一步改进电解槽槽型,从而得到质量更好、杂质更少的稀土金属,并对后续各物理场对颗粒的影响提供参考意义。

Force Analysis of Particle in Flow Field of 3kA Rare Earth Electrolysis Cell

With the application development of Nd-Fe-B permanent magnets in recent years,the requirement for the metal Nd quality has been increased.Meanwhile,the movement and dissolution of carbon particles in electrolysis process have crucial effect on the quality of metal.Combining theory with numerical simulation,this paper sorted out the main force types of carbon solid particles insoluble in electrolyte,and studied its trajectory by numerical simulation.In terms of rare earth electrolyte tank,this paper made particle-flow field calculation and simulation.The study showed that drag force and gravity are the mainforces of particles in electrolyte tank.The research also showed that drag force can change the particle trajectory,and the effect of the force will be increased with the size of particle.The particle size of 0.07 mm is the critical value to distinguish gravity from drag.The larger particle size makes more difficulty in obtaining pure Nd in electrolyte tank.This paper also provides further references for improving the type of electrolytic tank,so as to obtain rare earth metals with better quality and less impurities.Moreover it provides reference for the studies of the influences of subsequent physical fields on particles.