Separation of Silicon from Coarse Al-Si Melts under Alternating Electromagnetic Field with Varying Frequencies
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ORIGINAL PAPER
Separation of Silicon from Coarse Al-Si Melts under Alternating Electromagnetic Field with Varying Frequencies Yufeng Zhang 1,2,3 & Yanfeng Chang 4 & Guoqiang Lv 1,2,3 & Wenhui Ma 1,2,3 & Yunfei He 1,2,3 & Guangjie Xie 1,2,3 Received: 6 September 2019 / Accepted: 2 January 2020 # Springer Nature B.V. 2020
Abstract The separation behaviour of primary silicon from high-silicon Al-Si melts during the directional solidification under alternating electromagnetic field with varying frequencies and pulling rates is investigated. Results show that the separation of Si from Al-Si melts significantly depends on the electromagnetic frequency and the solidification rate of the melts as well. Moreover, the separation and enrichment effects of Si electromagnetic frequency with 3 kHz was superior to 30 kHz during the electromagnetic separation process, which was independent on the initial concentration. The flat and distinct separation interfaces could be formatted by using a relatively low pulling rate of 5 μm/s and a frequency of 3 kHz. Finally, the differential scanning calorimetry analysis showed that the alloy section had good thermal stability in the whole electromagnetic separation process. This method has the prospect and potential of becoming the method for manufacturing low-cost Al-Si alloys after the electrothermal process. Keywords Al-Si alloy . Thermal stability . Casting . Microstructure . Electrothermal
1 Introduction * Guoqiang Lv [email protected] * Wenhui Ma [email protected] Yufeng Zhang [email protected] Yanfeng Chang [email protected] Yunfei He [email protected] Guangjie Xie [email protected] 1
State Key Laboratory of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming 650093, China
2
Faculty of Metallurgical and Energy Engineering, The National Engineering Laboratory for Vacuum Metallurgy, Kunming University of Science and Technology, Kunming 650093, China
3
Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial Universities, Kunming 650093, China
4
Library of Kunming University of Science & Technology, Kunming 650500, China
It’s undoubtedable that Al-Si alloys are widely used in kinds of fields such as automobile, aerospace and electronic domains due to their high strength-to-weight ratio, excellent casting ability, wonderful wear and corrosion resistance and high tensil [1]. Generally, the most common methods to manufacture Al-Si alloys include the mixing method, molten salt electrolysis, and electrothermal reduction method. Presently in China, mixing method is the dominated method to produce eutectic Al-Si alloys, namely remelting metallurgical-grade silicon (MG-Si) and electrolytic aluminum with different proportions [2]. Whereas, the manufacturing chain to eutectic Al-Si alloys needs long transportation routes, high requirements for quality of the apparatus, high consumption of energy, and also triggers off adverse environmental effects [3]. Furthermore, the carbon electrothermal reduction method to prod
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