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Application of a model for liquid inclusion separation at a steel-slag interface for laboratory and industrial situations
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2008 (English)In: Steel Research International, ISSN 1611-3683, Vol. 79, no 11, 826-834 p.Article in journal (Refereed) Published
Abstract [en]

A mathematical model based on the equations of particle motion was used to predict inclusion behavior observed at steel-slag interface in an in-situ Confocal Scanning Laser Microscope. The results show that the model can be used to explain some phenomena observed in the experiments. In addition, a parameter study was done in order to illustrate how the model can be used to study the effect of physical properties on the inclusion behavior at the slag-steel interface for some typical industrial ladle metallurgy conditions. Furthermore, to study the effect of steel temperature, sulfur and oxygen content in the steel, slag and inclusion density as well as initial inclusion velocity on the inclusions behavior at the slag-steel interface. The results show that the temperature and initial velocity was of less importance and that the oxygen content in the steel had a larger influence on the inclusion behavior than the sulfur content in the steel.

Place, publisher, year, edition, pages
2008. Vol. 79, no 11, 826-834 p.
Keyword [en]
CSLM experiments; Ladle refining; Mathematical model; Non-metallic inclusions; Physical properties; Equations of motion; Inclusions; Ladle metallurgy; Ladles; Mathematical models; Oxygen; Slags; Steel; Steel research; Sulfur; Surface chemistry; Confocal scanning laser microscopes; CSLM experiments; In-situ; Inclusion behaviors; Inclusion densities; Initial velocities; Ladle refining; Liquid inclusions; Non-metallic inclusions; Oxygen contents; Parameter studies; Particle motions; Steel interfaces; Steel temperatures; Sulfur contents; Steel metallurgy
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-7803DOI: 10.2374/SRI08SP006ISI: 000261160600004Scopus ID: 2-s2.0-57049156122OAI: oai:DiVA.org:kth-7803DiVA: diva2:12933
Note
QC 20100823Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2010-08-23Bibliographically approved
In thesis
1. A Mathematical and Experimental Study of Inclusion Behaviour at a Steel-Slag Interface
Open this publication in new window or tab >>A Mathematical and Experimental Study of Inclusion Behaviour at a Steel-Slag Interface
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

The aim of this thesis work is to increase the knowledge of inclusion behavior at the steel-slag interface by mathematical modeling and in-situ Confocal Scanning Laser Microscope experiments. Mathematical models based on the equation of motion predicting liquid and solid inclusion behavior was first investigated. Four main forces, the buoyancy force, the added mass force, the rebound force and the drag force, act on the inclusion as it crosses the interface. There are three types of behavior an inclusion at the steel-slag interface can adopt. These are a) pass, which means that the inclusion is separated to the slag, b) remain, where the inclusion stays at the interface without being fully transferred to the slag or c) oscillate, and the inclusion rises and descends at the interface until the motion is dampened out by the interfacial forces. The studies showed the importance of accurate experimental physical property data. Application of the models to industrial conditions illustrated that useful plots could be made showing the industry how to optimize their interfacial properties in the ladle and tundish to obtain maximum inclusion separation.

In-situ Confocal Scanning Laser Microscope (CSLM) experiments were carried out in order to study agglomeration of liquid and semi liquid inclusions at the steel-gas and steel-slag interfaces and in the slag. Liquid-liquid inclusion agglomeration at steel-gas and steel-slag interfaces was seen to not occur without using force. However, when already transferred to the slag the inclusions agglomerated freely due to a higher free energy force. Comparison of experimental and theoretical agglomeration force showed good agreement between experiments and theory.

The main conclusion of this work is that inclusion separation is a complex field of study and there exist no model that takes everything into account. Here the tendency for inclusion transfer and how to manipulate the physical properties for inclusion separation together with agglomeration experiments have been studied. For the future maybe coupling of models for computational fluid dynamics, agglomeration, inclusion separation, dissolution and slag entrainment in addition with experimental physical property data can provide a better overview and understanding.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. vii, 58 p.
Series
KTH/MSE, 2007:60
Keyword
mathematical modeling, inclusion separation, tundish, ladle, slag, steel-slag interface, CSLM experiments, agglomeration, physical properties
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-4574 (URN)978-91-7178-781-1 (ISBN)
Public defence
2007-12-19, Sal B2, KTH, Brinellvägen 23, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100823Available from: 2007-12-12 Created: 2007-12-12 Last updated: 2010-08-23Bibliographically approved

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