NDLI: Slag Treatment Followed by Acid Leaching as a Route to Solar-Grade Silicon

Content Provider	Springer Nature Link
Author	Meteleva Fischer, Yulia V. Yang, Yongxiang Boom, Rob Kraaijveld, Bert Kuntzel, Henk
Copyright Year	2012
Abstract	Refining of metallurgical-grade silicon was studied using a process sequence of slag treatment, controlled cooling, and acid leaching. A slag of the Na$_{2}$O-CaO-SiO$_{2}$ system was used. The microstructure of grain boundaries in the treated silicon showed enhanced segregation of impurities, and the formation of CaSi$_{2}$ and other Ca-rich phases. Boron and phosphorus were found in the grain boundary phases of silicon after the slag treatment and were successfully removed together with most of the metallic impurities by acid leaching. The interaction between silicon and slag and the distribution of impurities are discussed. A novel mechanism of the refining approach is proposed, based on the microstructure of silicon and the analysis of impurities at each refining step. Parallel processes of slag refining, segregation, and solvent refining were observed, which explains the relatively high efficiency of the proposed refining technology. The investigated combination of refining processes followed by acid leaching has great potential as an efficient and cost-saving route for upgrading metallurgical-grade to solar-grade silicon.
Starting Page	957
Ending Page	967
Page Count	11
File Format	PDF
ISSN	10474838
Journal	JOM
Volume Number	64
Issue Number	8
e-ISSN	15431851
Language	English
Publisher	Springer US
Publisher Date	2012-07-31
Publisher Institution	The Minerals, Metals & Materials Society (TMS)
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Earth Sciences Chemistry/Food Science Environment Physics Engineering
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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