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论文类型：期刊论文

发表时间：2014-08-01

发表刊物：JOURNAL OF CRYSTAL GROWTH

收录刊物：SCIE、EI、Scopus

卷号：399

页面范围：43-48

ISSN号：0022-0248

关键字：Purification; Stirring; Solidification; Alloys

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 refilled 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. (C) 2014 Elsevier B.V. All rights reserved.