2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 8: Non-ferrous, Rotary Kiln, Ferro-alloys, Rare Earth, Coal

Editors:Kongoli F, Xueyi G, Shumskiy V, Kozlov P, Capiglia C, Silva AC, Turna T
Publisher:Flogen Star OUTREACH
Publication Year:2016
Pages:350 pages
ISBN:978-1-987820-50-8
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Boron Removal from Metallurgical Grade Silicon Using a United Blowing-slagging Secondary Refining Technique

    Min Xu1; Jijun Wu1; Wenhui Ma1;
    1KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY, KUNMING, China;
    Type of Paper: Regular
    Id Paper: 210
    Topic: 6

    Abstract:

    Boron is an obstinate impurity to be removed from metallurgical grade silicon (MG-Si) by metallurgical route. In this paper, boron removal from MG-Si was carried out by a united blowing-slagging secondary refining technique. The gases O2 and H2O-O2 were blown into MG-Si melt in an electrical resistance furnace. Simultaneously, the slagging reagents SiO2-CaO-CaCl2, SiO2-CaCl2 and CaO-CaCl2 were also added. The effects of gas composition, slag composition, gas flow rate, ratio of slag to MG-Si, refining time and refining temperature on the efficiency of boron removal were investigated. The results indicated that the boron removal efficiency of 40% and 97% can be obtained, respectively, when a single O2 or H2O-O2 gas was blown with a refining time of 120 min at 1450 oC. The distribution coefficient of boron (LB) increased from 0.93 to 2.85 with a slag/MG-Si ratio of 2:1, a refining temperature of 1550 oC and refining time of 120 min, respectively. An optimal result can be gotten by a united blowing-slagging refining method.

    Keywords:

    Furnace; Gases; Melting; Non-Ferrous; Oxygen; Processing; Slag; Smelting; Temperature; Thermodynamics;

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    Cite this article as:

    Xu M, Wu J, Ma W. Boron Removal from Metallurgical Grade Silicon Using a United Blowing-slagging Secondary Refining Technique. In: Kongoli F, Xueyi G, Shumskiy V, Kozlov P, Capiglia C, Silva AC, Turna T, editors. Sustainable Industrial Processing Summit SIPS 2016 Volume 8: Non-ferrous, Rotary Kiln, Ferro-alloys, Rare Earth, Coal. Volume 8. Montreal(Canada): FLOGEN Star Outreach. 2016. p. 149-150.