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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Analyses And Characterization Of Industrial Silicon Slag On Physicochemical Properties
Fanmao Wang1; Jijun Wu1; Wenhui Ma1; Min Xu1;1KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY, KUNMING, China;
Type of Paper: Regular
Id Paper: 330
Topic: 6
Abstract:
Industrial silicon slag is a kind of metallurgical slag during ladle secondary refining process. In this study, the following methods were used: X-ray fluorescence (XRF), scanning electron microscopy (SEM), the energy dispersive spectrometer (EDS), and the X-ray diffraction (XRD) to determine the chemical composition, morphology, and phase of silicon slag and silicon inclusions in slag. The results showed that O, Si and Ca concentrations in silicon slag were very high, and the silicon content was as high as 22.19%. The purity of metallic silicon wrapped by slag reached 94.07%. Compared with the normal metallic silicon product, the concentrations of Ca and Al in silicon inclusions obviously increased while the concentrations of other impurities changed little. In addition, the separation between silicon and slag was not complete. After cooling, the impurity phases in silicon inclusions enriched at the grain boundaries and produced a significant dendritic segregation phenomenon. The silicon slag was mainly composed of Si, SiC and oxides of Si, Fe, Al and Ca. The impurity phases in silicon inclusions were FeSi2, Ca3Al2Si2, and CaSi2.
Keywords:
metallic silicon; secondary refining; silicon slag; inclusion; physicochemical propertyReferences:
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