Purification of metallurgical grade Si combining Si-Sn solvent refining with slag treatment

Ma, Xiaodong, Yoshikawa, Takeshi and Morita, Kazuki (2014) Purification of metallurgical grade Si combining Si-Sn solvent refining with slag treatment. Separation and Purification Technology, 125 264-268. doi:10.1016/j.seppur.2014.02.003


Author Ma, Xiaodong
Yoshikawa, Takeshi
Morita, Kazuki
Title Purification of metallurgical grade Si combining Si-Sn solvent refining with slag treatment
Journal name Separation and Purification Technology   Check publisher's open access policy
ISSN 1383-5866
1873-3794
Publication date 2014-04-07
Sub-type Article (original research)
DOI 10.1016/j.seppur.2014.02.003
Open Access Status Not Open Access
Volume 125
Start page 264
End page 268
Total pages 5
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Formatted abstract
Highlights
• A novel process using Si–Sn solvents for SOG-Si refining was investigated.
• Refined Si crystals were easily agglomerated and separated.
• B content decreases to 0.3 ppmw, satisfying its usage of solar cell.
• An overall low-cost process for producing SOG-Si using Si–Sn solvent was proposed.

In order to develop a low-cost metallurgical route for solar grade silicon (SOG-Si) production, a novel process sequence of slag treatment and solidification refining using Si-Sn solvents under induction heating, followed by acid leaching was investigated. Slag and metal phases can be fully separated due to their density difference. Refined Si crystals were agglomerated in the metal by combining the electromagnetic stirring effect with controlled cooling. The purification efficiency showed high removal of impurities, especially B content decreasing to 0.3 ppmw, satisfying its allowable content in usage of solar cell. This route allows more effective removal of B with much less usage of slag volume which has the great potential for practical application and an overall low-cost process for producing SOG-Si using Si-Sn solvent was proposed.
Keyword Solar grade Si
Si–Sn solvent
Induction heating
Purification
Separation
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Non HERDC
 
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Citation counts: TR Web of Science Citation Count  Cited 11 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 17 Mar 2014, 23:46:16 EST by Xiaodong Ma on behalf of School of Chemical Engineering