Boron removal from metallurgical grade silicon using a FeCl2 molten salt refining technique

Jia B.J.; Wu J.J.; Ma W.H.; Yang B.; Liu D.C.; Dai Y.N.

doi:10.2298/JMMB120823019J

Journal of Mining and Metallurgy. Section B: Metallurgy (Jan 2013)

Boron removal from metallurgical grade silicon using a FeCl2 molten salt refining technique

Jia B.J.,
Wu J.J.,
Ma W.H.,
Yang B.,
Liu D.C.,
Dai Y.N.

Affiliations

Jia B.J.: Kunming University of Science and Technology, The national Engineering Laboratory for vacuum metallurgy, Kunming, China + Kunming University of Science and Technology, Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Prov
Wu J.J.: Kunming University of Science and Technology, The national Engineering Laboratory for vacuum metallurgy, Kunming, China + Kunming University of Science and Technology, Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Prov
Ma W.H.: Kunming University of Science and Technology, The national Engineering Laboratory for vacuum metallurgy, Kunming, China + Kunming University of Science and Technology, Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Prov
Yang B.: Kunming University of Science and Technology, The national Engineering Laboratory for vacuum metallurgy, Kunming, China
Liu D.C.: Kunming University of Science and Technology, The national Engineering Laboratory for vacuum metallurgy, Kunming, China
Dai Y.N.: Kunming University of Science and Technology, The national Engineering Laboratory for vacuum metallurgy, Kunming, China + Kunming University of Science and Technology, Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Prov

DOI: https://doi.org/10.2298/JMMB120823019J
Journal volume & issue: Vol. 49, no. 3
pp. 257 – 261

Abstract

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The slag refining for boron removal from metallurgical grade silicon is a promising metallurgical process for producing solar grade silicon. In this paper, FeCl2 molten salt has been used as a new refining agent to remove boron from MG-Si. The effects of refining time and mass ratio of MG-Si to FeCl2 molten salt on boron removal have been investigated in detail. The results showed that boron can be efficiently removed in form of BCl3 and boron concentration in MG-Si was successfully reduced from 22×10-6 to 4×10-6 at 1823K for 2 h with the mass ratio of FeCl2 molten salt to MG-Si for 1.0. The rate equation of boron removal using FeCl2 molten salt was proposed and established in kinetic, which showed a large difference in removal limitation of boron compared with thermodynamics.

Published in Journal of Mining and Metallurgy. Section B: Metallurgy

ISSN: 1450-5339 (Print); 2217-7175 (Online)
Publisher: Technical Faculty, Bor
Country of publisher: Serbia
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.doiserbia.nb.rs/journal.aspx?issn=1450-5339

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