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Separation and purification of Si from solidification of hypereutectic Al-Si melt under rotating magnetic field

机译:旋转磁场下过共晶Al-Si熔体凝固中的Si分离纯化

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摘要

A low-cost and high-efficiency method to purify Si directly from cheap MG-Si at low temperature was proposed and demonstrated in this paper, which used power frequency rotating magnetic field (RMF) to separate the primary Si from a hypereutectic Al-Si alloy and was followed by the acid peeling. The separation mechanism was based on the flow characteristic of melt under RMF and the cooling condition of the liquid metal. A Si-rich layer with Si content of 65-59 wt% was formed in the periphery of alloy, while the inner microstructure of the alloy was mainly the Al-Si eutectic structure. The refined silicon was collected after aqua regia leaching, and had much fewer typical impurities (Fe, Ti, Ca, B, P) than those in MG-Si, and the metallic impurities besides Al had removal fraction higher than 98%, which is mainly ascribed to the segregation effect of Al-30Si alloy during solidification under RMF.
机译:提出并证明了一种低成本,高效地从廉价的MG-Si低温直接纯化Si的方法,该方法利用工频旋转磁场(RMF)分离过共晶Al-Si中的原始Si合金,然后酸剥离。分离机理是基于RMF下熔体的流动特性和液态金属的冷却条件。在合金的外围形成了Si含量为65-59wt%的富Si层,而合金的内部微观结构主要为Al-Si共晶结构。经王水浸提后收集到的精制硅,其典型杂质(Fe,Ti,Ca,B,P)比MG-Si少得多,除Al之外的金属杂质的去除率均高于98%,这是主要归因于RMF凝固过程中Al-30Si合金的偏析作用。

著录项

  • 来源
    《Journal of Crystal Growth》 |2014年第1期|43-48|共6页
  • 作者单位

    School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;

    School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;

    Laboratory of Special Processing of Raw Materials, Dalian University of Technology, Dalian 116024, China;

    School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;

    School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;

    School of Material Science and Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China;

    Laboratory of Special Processing of Raw Materials, Dalian University of Technology, Dalian 116024, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    A1.Purification; A1.Stirring; A1.Solidification; B1.Alloys;

    机译:A1。净化;A1。搅拌;A1。固化B1。合金;

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