Use of Computational Thermodynamic Calculations in Studying the Slag/Steel Equilibrium during Vacuum Degassing

The effectiveness of a ladle refining process for production of tool steel with focus on the top slag is studied using computational thermodynamic calculations. The theoretical assessment was based on compositional data of steel and slag samples collected during trials in a plant equipped with a 65‐...

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Bibliographic Details
Published in:Steel research international 2010-01, Vol.81 (1), p.31-39
Main Authors: Doostmohammadi, H., Andersson, M., Karasev, A., Jönsson, P.G.
Format: Article
Language:English
Subjects:
Chemical engineering
computational thermodynamics
Deoxidizing
DESULFURIZATION
Iron and steel making
Kemiteknik
ladle glaze
Ladle metallurgy
ladle refining
ladle slag
Ladles
Mathematical analysis
METAL
Metallurgical process and manufacturing engineering
Metallurgical process engineering
Metallurgisk process- och produktionsteknik
Metallurgisk processteknik
MOLTEN STEEL
slag carryover
SLAG COMPOSITION
Slags
STEEL PRODUCTION
Steels
SULFIDE CAPACITY
synthetic slag
TECHNOLOGY
TEKNIKVETENSKAP
Thermodynamics
tool steel
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Summary:The effectiveness of a ladle refining process for production of tool steel with focus on the top slag is studied using computational thermodynamic calculations. The theoretical assessment was based on compositional data of steel and slag samples collected during trials in a plant equipped with a 65‐t EAF, a ladle furnace and a vacuum degasser. The calculation of slag‐metal equilibrium during ladle treatment was performed for top slag excluding (Case A) and including (Case B) slag carryover and deoxidation products. The predictions showed that slag carryover and deoxidation products in the ladle significantly affect the composition of the top slag. Thus, these conditions must be taken into consideration when predicting the actual top slag composition. It was also found that it is possible to predict the final aluminium and sulphur content in steel based on the same calculation approach.
ISSN:1611-3683
1869-344X
1869-344X
DOI:10.1002/srin.200900112