A novel approach to prepare high-purity Si and Si/TiSi2 materials simultaneously using Ti-bearing blast furnace slag
A new approach was proposed to prepare multi-products, high-purity Si powders, bulk Si, and Si/TiSi2 materials (eutectic Si-Ti), simultaneously using inexpensive low-purity Si (99.3%) and metallurgical waste—Ti-bearing blast furnace slag. TiO2 in Ti-bearing blast furnace slag was first reduced by Si...
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Published in | Journal of alloys and compounds Vol. 798; pp. 333 - 341 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Lausanne
Elsevier B.V
25.08.2019
Elsevier BV |
Subjects | |
Online Access | Get full text |
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Summary: | A new approach was proposed to prepare multi-products, high-purity Si powders, bulk Si, and Si/TiSi2 materials (eutectic Si-Ti), simultaneously using inexpensive low-purity Si (99.3%) and metallurgical waste—Ti-bearing blast furnace slag. TiO2 in Ti-bearing blast furnace slag was first reduced by Si to form a Si-Ti alloy which was then separated into high-purity bulk Si (99.97%) and Si/TiSi2 materials (99.4%) using directional solidification. The bulk Si could be repeatedly recycled as a reductant, or further upgraded to prepare super-pure Si powders (99.995%) after acid leaching. The new approach shows many sustainable and economic benefits, such as no carbon gas emission, low acid consumption and Si loss, recyclable Si reductant, widely-used multi-products employing one approach, and rapid consumption of accumulated Ti-bearing blast furnace slag.
•A new approach was proposed to clean up the Ti-bearing blast furnace slag.•Multi-products could be prepared simultaneously throughout one approach.•Most of Si could be recycled as reductant repeatedly.•Most of impurities could be removed to obtain high-purity Si and Ti materials.•Si-Ti alloy could be separated into bulk Si and eutectic Si-Ti alloy. |
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ISSN: | 0925-8388 1873-4669 |
DOI: | 10.1016/j.jallcom.2019.05.291 |