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

被引：26

作者：

Jie, J. C. ^{[1
]}

Zou, Q. C. ^{[1
]}

Wang, H. W. ^{[2
]}

Sun, J. L. ^{[1
]}

Lu, Y. P. ^{[1
]}

Wang, M. ^{[1
]}

Li, T. J. ^{[2
]}

机构：

[1] Dalian Univ Technol, Sch Mat Sci & Engn, Dalian 116024, Liaoning, Peoples R China

[2] Dalian Univ Technol, Lab Special Proc Raw Mat, Dalian 116024, Liaoning, Peoples R China

来源：

JOURNAL OF CRYSTAL GROWTH | 2014年 / 399卷

基金：

中国国家自然科学基金; 中国博士后科学基金;

关键词：

Purification; Stirring; Solidification; Alloys; CRYSTAL-GROWTH; SILICON; ALLOY;

D O I：

10.1016/j.jcrysgro.2014.04.003

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

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.

引用

页码：43 / 48

页数：6

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