高频磁场下铝合金中非金属夹杂物电磁分离研究

Research on electromagnetic separation of inclusions from aluminum alloy melts by high frequency magnetic field

在高频磁场作用下,利用金属与夹杂物之间电导率差产生的电磁排斥力去除非金属夹杂物.实验材料为Al-10%Al2O3、Al-10%SiC及Al-24%Si.将含有杂质的合金置于不同管径的分离器中,开启高频电源,调整输出功率,利用高频磁场将其熔化,并进一步实现非金属夹杂物的分离.分析了不同管径、颗粒尺寸、磁感应强度、作用时间等条件下的分离效果,结果发现球形Al2O3和SiC颗粒较针状初生硅的分离效果好一些,较高的磁感应强度和小的管径对夹杂物的分离有利.

Using the electromagnetic repulsive force resulting from the conductivity diversity between alloys and inclusions, the inclusions were removed successfully under high frequency magnetic field.The experiment materials included Al-10％Al2O3, Al-10％SiC and Al-24％Si. The aluminum alloys mixed with the inclusions were first placed in separators with different pipe diameters, then the high frequency electrical source was turned on and the output power was adjusted, finally the aluminum alloy was melted and the inclusions were separated. Moreover, the separation efficiency of each technological parameter, such as pipe diameter, particle size, magnetic density and acting time wasanalyzed. It is found that the spherical Al2O3 and SiC particles are more easily separated compared to the acicular primary silicon particles, and higher magnetic density and finer pipe diameter are beneficial to the separation of inclusions.