利用电磁场在Al-Si合金凝固过程中制备高纯度多晶Si

付莹; 丁鑫; 接金川; 王海伟; 张宇博; 卢一平; 李廷举

doi:10.15980/j.tzzz.2015.10.007

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利用电磁场在Al-Si合金凝固过程中制备高纯度多晶Si
Preparation of High-purity Silicon during Solidification of Al-Si Alloy by Electromagnetic Field
2015年35卷第10期页码：1030-1032
纸质出版日期： 2015 ，
DOI： 10.15980/j.tzzz.2015.10.007

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[1]付莹,丁鑫,接金川,王海伟,张宇博,卢一平,李廷举.利用电磁场在Al-Si合金凝固过程中制备高纯度多晶Si[J].特种铸造及有色合金,2015,35(10):1030-1032.

Fu Ying, Ding Xin, Jie Jinchuan, et al. Preparation of High-purity Silicon during Solidification of Al-Si Alloy by Electromagnetic Field[J]. Special Casting & Nonferrous Alloys, 2015,35(10):1030-1032.
[1]付莹,丁鑫,接金川,王海伟,张宇博,卢一平,李廷举.利用电磁场在Al-Si合金凝固过程中制备高纯度多晶Si[J].特种铸造及有色合金,2015,35(10):1030-1032. DOI： 10.15980/j.tzzz.2015.10.007.

Fu Ying, Ding Xin, Jie Jinchuan, et al. Preparation of High-purity Silicon during Solidification of Al-Si Alloy by Electromagnetic Field[J]. Special Casting & Nonferrous Alloys, 2015,35(10):1030-1032. DOI： 10.15980/j.tzzz.2015.10.007.

摘要

提出了一种低成本、高效率的提纯冶金级多晶Si的新方法

即利用交变旋转电磁场

从过共晶Al-Si合金熔体凝固过程中直接分离初生Si

经酸洗后制备太阳能级多晶Si。结果表明

在旋转磁场作用下

铸锭的外层形成富Si层

其中Si的质量占整个富Si层的60%左右

而铸锭内层大部分为Al-Si共晶组织。将富Si层从铸锭上剥离出来

用王水酸洗后

一些金属杂质元素与冶金级Si相比去除率高达98%以上

其中B、P等非金属杂质元素去除效率理想。

Abstract

A new method with low-cost and high-efficiency to purify MG（metallurgy grade）-Si was presented.The primary Si was separated directly from hypereutectic Al-Si melt by rotating magnetic field（RMF）.After etch cleaning

the solar-grade Si was obtained.The experimental results show that the Si-rich layer is formed in the ouer-layer of the ingot

and the content of Si is about 60% of Si-rich layer

while the inner microstructure of the ingot is composed mainly of the Al-Si eutectic structure.The Sirich was peeled from the ingot after aqua regia leaching

which its removal efficiency of metallic impurities was higher than 98%

and for B

P nonmetallic impurities

a desirable removal effect was realized.