Separation and Recovery of Refined Si from Al–Si Melt by Modified Czochralski Method

Author:

Li Jingwei,Li Juncheng,Lin Yinhe,Shi Jian,Ban Boyuan,Liu GuichengORCID,Yang Woochul,Chen Jian

Abstract

Separation of refined silicon from Al–Si melt is still a puzzle for the solvent refining process, resulting in considerable waste of acid and silicon powder. A novel modified Czochralski method within the Al–Si alloy is proposed. After the modified Czochralski process, a large amount of refined Si particles was enriched around the seed crystalline Si and separated from the Al–Si melt. As for the Al–28%Si with the pulling rate of 0.001 mm/min, the recovery of refined Si in the pulled-up alloy (PUA) sample is 21.5%, an improvement of 22% compared with the theoretical value, which is much larger 1.99 times than that in the remained alloy (RA) sample. The content of impurities in the PUA is much less than that in the RA sample, which indicates that the modified Czochralski method is effective to improve the removal fraction of impurities. The apparent segregation coefficients of boron (B) and phosphorus (P) in the PUA and RA samples were evaluated. These results demonstrate that the modified Czochralski method for the alloy system is an effective way to enrich and separate refined silicon from the Al–Si melt, which provide a potential and clean production of solar grade silicon (SoG-Si) for the future industrial application.

Funder

National Natural Science Foundation of China

Sichuan Province Science and Technology Support Program

State Key Laboratory of Refractories and Metallurgy

Natural Science Foundation of Anhui Province

Hefei Institutes of Physical Science, Chinese Academy of Sciences

State Key Laboratory of Pollution Control and Resource Reuse

Publisher

MDPI AG

Subject

General Materials Science

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