Removing boron from metallurgical grade silicon by a high basic slag refining technique

Wu J.J.; Xu M.; Liu K.B.; Ma W.H.; Yang B.; Dai Y.N.

doi:10.2298/JMMB140202005W

Journal of Mining and Metallurgy. Section B: Metallurgy (Jan 2014)

Removing boron from metallurgical grade silicon by a high basic slag refining technique

Wu J.J.,
Xu M.,
Liu K.B.,
Ma W.H.,
Yang B.,
Dai Y.N.

Affiliations

Wu J.J.: State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming, China + Key Laboratory of Non-Ferrous Metals Vacuum Metallurgy of Yunnan Province, Kun
Xu M.: Key Laboratory of Non-Ferrous Metals Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming, China + Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial Universities, Kunming U
Liu K.B.: Key Laboratory of Non-Ferrous Metals Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming, China + Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial Universities, Kunming U
Ma W.H.: State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming, China + Key Laboratory of Non-Ferrous Metals Vacuum Metallurgy of Yunnan Province, Kun
Yang B.: Key Laboratory of Non-Ferrous Metals Vacuum Metallurgy of Yunnan Province, Kunming University of Science and Technology, Kunming, China + Engineering Research Center for Silicon Metallurgy and Silicon Materials of Yunnan Provincial Universities, Kunming U
Dai Y.N.: State Key Laboratory Breeding Base of Complex Nonferrous Metal Resources Cleaning Utilization in Yunnan Province, Kunming University of Science and Technology, Kunming, China + Key Laboratory of Non-Ferrous Metals Vacuum Metallurgy of Yunnan Province, Kun

DOI: https://doi.org/10.2298/JMMB140202005W
Journal volume & issue: Vol. 50, no. 1
pp. 83 – 86

Abstract

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A new purification method of removing boron from metallurgical grade silicon (MG-Si) using a high baisicity slag was developed in this paper. The typical impurities Al, Ca, Ti, B, P etc in MG-Si can be removed by the binary calcium sillicate slag and it is especially efficient for removing impurity Boron. It was found that the maximal distribution coefficient of boron between calcium sillicate slag and silicon reaches to 1.57 when the mass ratio of CaO/SiO2 was 1.5 and the composition was 60%CaO-40%SiO2. It showed that the oxidizability of calcium sillicate slag was affected and restricted by the basicity and the mass ratio of acid oxide SiO slag according to the thermodynamic relationship. The boron concentration in MG-Si can be reduced from 18x10-6 to 4.5x10-6 and 1.4x10-6, respectively, when using the ternary slags 40.5%CaO-49.5%SiO2-10%Li2O and 32CaO-38%SiO2-30%Li2O.

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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