Electromagnetic separation of nonmetallic inclusion from liquid metal by imposition of high frequency magnetic field
Electromagnetic separation of nonmetallic inclusion from liquid metal by imposition of high frequency magnetic field
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DOI：
10.2355/isijinternational.43.820
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发表时间：
2003-01-01
影响因子：
1.8
通讯作者：
Taniguchi, S
中科院分区：
文献类型：
--
作者：
Takahashi, K;Taniguchi, S
本文研究了利用交变磁场产生的电磁力分离金属液中夹杂物颗粒的方法。为了弄清夹杂物分离的特点，在高频感应炉上用碳化硅-铝液体系进行了模拟实验。从凝固铝试样的横截面显微照片上测量了在侧壁上形成的颗粒聚集层的厚度及其颗粒的面积分数。结果表明，颗粒堆积层的生长在很短的时间内完成，随着线圈电流的增加，颗粒堆积层的厚度变小，颗粒堆积层中的颗粒含量变大。发现在小线圈电流的情况下，机械搅拌延缓颗粒分离。对于3质量%的颗粒添加获得的颗粒累积层的最大厚度几乎与趋肤深度相同。为了研究本系统中的电磁分离，建立了一个完整的混合模型，该模型考虑了粒子聚集层对电磁力分布的影响。该模型是基于拉弗斯的理论与一个简单的修改，在颗粒积累层的表观电导率的变化。颗粒浓度变化和颗粒堆积层生长的估算结果与观测结果吻合较好。
In this study, a method is investigated for separating inclusion particles from liquid metal by the electromagnetic force generated by an alternating magnetic field. To make clear the characteristics of the inclusion separation, a model experiment has been performed by the use of a SiC-liquid aluminum system in a high frequency induction furnace. The thickness of particle-accumulated layer formed on the side wall and its area fraction of particles are measured from the micrographs of the cross section of solidified aluminum sample. It is found that the growth of the particle-accumulated layer is completed in a short time (ten and several seconds), and that the thickness of the layer becomes smaller and the particle fraction in the layer becomes larger with increasing coil current. Mechanical stirring is found to retard particle separation in the case of small coil current. The maximum thickness of the particle-accumulated layer obtained for the 3 mass% addition of particle is almost same as the skin depth. To investigate the electromagnetic separation in the present system, a complete mixing model is made, which takes into account the effect of the particle-accumulated layer on the electromagnetic force distribution. This model is based on the Lavers' theory with a simple modification of the change in apparent electric conductivity in the particle-accumulated layer. The estimated results of the change in particle concentration and the growth of particle-accumulated layer are in good agreement with the observed results.