铝熔体中非金属夹杂物电磁分离效率研究

Research on electromagnetic separation efficiency of nonmetallic inclusions from aluminum melts

分析比较了电磁分离非金属夹杂物的几种不同方法 .推导了不同类型电磁场 ,如直流电场与稳恒磁场正交、交变磁场、交变电场等作用下夹杂物的去除速度和去除效率计算公式 ,并同重力沉积速度进行了对比 .对圆管半径、电磁场频率等参数对去除效率的影响作了分析阐述 .发现夹杂物的去除效率随着电流及其作用时间的增加而增加 ,但随管径增加而显著降低 .就小尺寸夹杂物的分离而言 ,交变磁场法相对较好 ,因为其去除效率对颗粒尺寸的依赖性较小 .

Several methods for the electromagnetic separation of nonmetallic inclusions from an aluminum melt were analyzed and compared. The migration rate of inclusion particles for each method, such as DC electric field with steady magnetic field, AC magnetic field, AC electric field, was derived and compared with the gravity settling velocity. Effects of the radius of circular pipe and frequency on the inclusion removal efficiency were ascertained for each case. It is found that the removal efficiency for three methods increases with the current and acting time, conversely, decreases with the pipe radius. As far as the removal of small inclusions is concerned, the AC magnetic method is a favorable one because its removal efficiency has less dependence upon the particle size.