Abstract Industrial silicon is always used for the manufacture of organosilicon. This study evaluated the segregation properties of hypereutectic aluminum–silicon melts and revealed the silicon separation process from hypereutectic aluminum-silicon melts dealt with alternating electromagnetic directional solidification (AEM-DS). During the electromagnetic refining, the electromagnetic force can not penetrate Al–Si melts deeply and melts flow was generated by the outer thin surface, when the frequencies are 3, 30 and 50 kHz, the corresponding skin depths are 5.930, 1.876 and 1.027 mm, which show sharp attenuations. Moreover, the numerical simulation was used to simulate the electromagnetic field distribution. The experimental phenomenon can accord well with the simulation and calculation results. Moreover, this study reveal the middle process of hypereutectic Al–Si melt dealt with AEM-DS. The better separation effect will be helpful to eliminate Si, Al and acid waste in the following acid leaching.

中文翻译：

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用于有机硅的过共晶铝硅分离提纯工艺

摘要 工业硅一直用于制造有机硅。该研究评估了过共晶铝硅熔体的偏析特性，并揭示了从交替电磁定向凝固 (AEM-DS) 过共晶铝硅熔体中分离硅的过程。在电磁精炼过程中，电磁力无法深入Al-Si熔体，熔体流动由外薄表面产生，当频率为3、30和50 kHz时，对应的趋肤深度为5.930、1.876和1.027 mm，显示出急剧衰减。此外，数值模拟被用来模拟电磁场分布。实验现象与模拟计算结果吻合较好。而且，该研究揭示了 AEM-DS 处理过共晶 Al-Si 熔体的中间过程。较好的分离效果有利于后续酸浸过程中Si、Al和酸渣的去除。