Distribution of Calcium and Aluminum Between Molten Silicon and Silica-Rich CaO-Al2O3-SiO2 Slags at 1823 K (1550 °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 2 O 3 -SiO 2 slags were equilibrated...

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Published inMetallurgical and materials transactions. B, Process metallurgy and materials processing science Vol. 48; no. 1; pp. 308 - 316
Main Authors Ahn, Seung Hwan, Jakobsson, Lars Klemet, Tranell, Gabriella
Format Journal Article
LanguageEnglish
Published New York Springer US 01.02.2017
Subjects
Characterization and Evaluation of Materials
Chemistry and Materials Science
Materials Science
Metallic Materials
Nanotechnology
Structural Materials
Surfaces and Interfaces
Thin Films
Liquidus Line
Slag Composition
Silica Crucible
Molten Silicon
Graphite Crucible
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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 2 O 3 -SiO 2 slags were equilibrated with silicon at 1823 K (1550 °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 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