Extraction of Al-Si master alloy and alumina from coal fly ash
Coal fly ash from coal power plants is a potential raw material for the production of alumina. An objective aluminothermic reduction method for the preparation of Al-Si master alloy and alumina from coal fly ash was investigated. The kinetic analysis using non-isothermal differential scanni...
Saved in:
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2017-01-01
|
| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2017/1450-53391700006L.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Coal fly ash from coal power plants is a potential raw material for the
production of alumina. An objective aluminothermic reduction method for the
preparation of Al-Si master alloy and alumina from coal fly ash was
investigated. The kinetic analysis using non-isothermal differential scanning
calorimetry indicated that the reduction of Al6Si2O13, Fe2O3, and TiO2 by
aluminum in coal fly ash occurs at 1618 K, 1681 K, and 1754 K, respectively.
Moreover, the influence of reaction temperature on product composition was
studied. The phases and morphologies of the products obtained by the
aluminothermic reduction of coal fly ash at 1373-1773 K were analyzed by
X-ray diffraction, scanning electron microscopy, and energy-dispersive
spectroscopy, respectively. The results from X-ray diffraction show that no
oxide reduction has taken place at 1373 K and 1473K, the compositions of the
product obtained by aluminothermic reduction of fly ash at 1573K- 1673 K are
Al2O3, mullite, Al and Si, while the compositions of the product at 1773 K
are Al2O3, Al, and Si. In addition, the chemical compositions of Al-Si alloy
obtained at 1773 K are 86.81 wt% Al and 13.19 wt% Si. |
|---|---|
| ISSN: | 1450-5339 2217-7175 |