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.