Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    No. 4    April 2012

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Si purification by solidification of Al−Si melt with super gravity
LI Jing-wei1, GUO Zhan-cheng1, TANG Hui-qing1, WANG Zhi2, SUN Shi-tong1

1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing,
Beijing 100083, China;
2. National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology,
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China

Abstract:The investigation on purification of metallurgical grade silicon by solidification of hypereutectic Al−Si melt with super gravity as an intensified separation way was carried out. The results indicate that the refined silicon grains are successfully enriched at the bottom of the Al−Si alloy along the direction of super gravity. Then the refined silicon was collected by aqua regia leaching. The purity of the collected silicon is analyzed as 99.92%, which is obviously improved compared with the purity of the metallurgical grade silicon of 99.59%, proving the feasibility of this purification method. Furthermore, the mass fraction of B is reduced from 8.33×10−6 to 5.25×10−6 and that of P from 33.65×10−6 to13.50×10−6.

 

Key words: super gravity; metallurgical grade Si; Al−Si melt; solidification; purification

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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