中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 4 April 2012 |
（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
