Boron removal from metallurgical grade silicon using a FeCl2 molten salt refining technique
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-S...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2013-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2013/1450-53391300019J.pdf |
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| Summary: | 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. |
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| ISSN: | 1450-5339 |