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Inclusion growth and removal in gas-stirred ladies
KTH, Superseded Departments, Materials Science and Engineering.
KTH, Superseded Departments, Materials Science and Engineering.
KTH, Superseded Departments, Materials Science and Engineering.
2004 (English)In: Steel research, ISSN 0177-4832, Vol. 75, no 2, 128-138 p.Article in journal (Refereed) Published
Abstract [en]

A static modelling approach was used to study the growth and removal of inclusions during gas stirring in a ladle. A mathematical model of a gas-stirred ladle was used to predict the data necessary to calculate growth and removal of inclusions. Results indicated that inclusion growth resulting from laminar shear collisions is negligible in comparison with growth from turbulent and Stokes collisions. Furthermore, the need for a model describing inclusion flotation by spherical-cap bubbles was identified. Since the existing models presented in the literature are only valid for spherical bubbles, a model for the removal of inclusions by spherical-cap bubbles was developed. Inclusion removal to the slag, refractory and by bubble flotation was compared. The mechanism determined to be responsible for the removal of the majority of inclusions larger than 25 mum was Stokes flotation and for the majority of the smaller inclusions, bubble flotation by spherical-cap bubbles (assuming plane contact between the inclusion and the bubble).

Place, publisher, year, edition, pages
2004. Vol. 75, no 2, 128-138 p.
Keyword [en]
CFD model, inclusion removal, bubble flotation, inclusion growth, gas stirring
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-45408ISI: 000188945500007OAI: oai:DiVA.org:kth-45408DiVA: diva2:452572
Note
QC 20111031Available from: 2011-10-31 Created: 2011-10-28 Last updated: 2017-12-08Bibliographically approved

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