Distribution of Calcium and Aluminum Between Molten Silicon and Silica-Rich CaO-Al sub(2)O sub(3)-SiO sub(2) Slags at 1823 K (1550 degree C)

Oxidative refining of silicon after tapping from the furnace is performed to remove calcium and aluminum impurities. Depending on the slag composition, the refining limit is determined by the thermodynamic equilibrium between silicon and slag. Silica-rich CaO-Al sub(2)O sub(3)-SiO sub(2) slags were...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2017-02, Vol.48 (1), p.308-316
Main Authors: Ahn, Seung Hwan, Jakobsson, Lars Klemet, Tranell, Gabriella
Format: Article
Language:English
Subjects:
Aluminum
Calcium
Calcium aluminum silicates
Process metallurgy
Silicon
Slags
Thermodynamic equilibrium
Transaction processing
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Summary:Oxidative refining of silicon after tapping from the furnace is performed to remove calcium and aluminum impurities. Depending on the slag composition, the refining limit is determined by the thermodynamic equilibrium between silicon and slag. Silica-rich CaO-Al sub(2)O sub(3)-SiO sub(2) slags were equilibrated with silicon at 1823 K (1550 degree C) in the present study. The results were compared with previous experimental measurements, experimentally measured activities in the slag and thermodynamically modeled data. The present study was found to agree relatively well with most of these works. The concentrations of calcium and aluminum in silicon along the liquidus line for SiO sub(2) saturation were also investigated, and this area was found to have less agreement between different works.
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-016-0829-0