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对空心圆柱熔体中非金属夹杂的电磁分离过程进行了动力学分析 ,通过解析法计算得出了无量纲数 r1 /δ、磁感应强度 Be、电磁力作用时间 t和颗粒粒径 dp 等与夹杂分离效率 η的关系 .结果表明 ,采用空心圆柱形状 ,可以使实心圆柱熔体大部分区域受力较弱的情况得到改善 ,提高分离效率 ;取频率 f=10～ 15 k Hz、r1 / δ=1.5～ 2时 ,可获得最大电磁分离效率 ;对粒径小于 5μm的夹杂颗粒 ,电磁分离作用不显著 ;磁感应强度和电磁力作用时间的最佳取值范围是 t>5 s、Be>0 .1T.
The kinetic analysis of the electromagnetic separation of non-metallic inclusions in hollow cylindrical melt was carried out. The dimensionless number r1 / δ, magnetic induction Be, electromagnetic force time t and particle size dp were calculated by analytical method. Separation efficiency η.The results show that hollow cylindrical shape can make the situation of weak stress in most of the solid cylindrical melt improve and improve the separation efficiency.When the frequency f = 10 ~ 15 k Hz, r1 / δ = 1.5 ~ 2, the maximum electromagnetic separation efficiency can be obtained; for the inclusion size less than 5μm, the electromagnetic separation effect is not significant; the optimum range of magnetic induction intensity and electromagnetic force time is t> 5 s, Be> 0. 1T.