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A model of reoxidation from the top slag and the effect on sulphur refining during vacuum degassing
KTH, Superseded Departments, Materials Science and Engineering.
2003 (English)In: Scandinavian journal of metallurgy, ISSN 0371-0459, Vol. 32, no 3, 123-136 p.Article in journal (Refereed) Published
Abstract [en]

A 2-dimensional fluid-flow model covering 3 phases (steel, slag and gas) has been augmented to include thermodynamic equations to study simultaneous reoxidation and desulphurization, including macro kinetic behaviour. The numerical simulations were isothermal. Predicted steel and slag component concentrations were compared with plant data from vacuum degassing and the agreement was found to be quite good. When the initial FeO content in the slag was increased, the predicted desulphurization rate decreased, the final sulphur content in the steel increased, and aluminium loss increased. When the temperature was increased, the predicted aluminium loss decreased somewhat. The effect of changes in temperature on the predicted final sulphur content was influenced by the initial FeO content in the top slag. The results show that the model can be used for future work on the dynamic modelling of slag/metal reactions if the initial FeO content is less than 3-4% (by weight).

Place, publisher, year, edition, pages
2003. Vol. 32, no 3, 123-136 p.
Keyword [en]
aluminium loss, CFD modelling, ladle treatment, reoxidation, sulphur refining, top slag, vacuum degassing, gas-stirred ladle, fluid-flow
URN: urn:nbn:se:kth:diva-22510ISI: 000182940900002OAI: diva2:341208
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Jonsson, Lage T. I.
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