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Dissolution of MgO Based Refractories in CaO-Al2O3-MgO-SiO2 Slag
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Micro-modelling)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Micro-Modelling.
Department of R&D, INSERTEC.
(English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619XArticle in journal (Other academic) Submitted
Abstract [en]

Dissolution of different types of MgO based refractories into molten CaO-Al2O3-MgO-SiOslag was studied at 1873 K. The prepared refractory cubes were dissolved in both stagnant slagand slag stirred with different speeds. Even in a stagnant slag, the decarbonized commercial MgO-carbon refractory dissolved very fast. Formation of micro spinel particles by addition of either colloidal alumina or micro alumina powder in the MgO matrix efficiently reduced the dissolution. The dissolution of MgO refractories into slag was found to be controlled by the slag penetration into the MgO matrix. In the case of stagnant slag, the slag penetration would lead to the final dissociation of the decarbonized commercial MgO-carbon cube in less than 6 minutes. A slag penetrated layer was formed in the cubes with spinel particles formed in situ.The major dissolution took place between the MgO grains and the liquid in this penetrated layer. The increase of the thickness would slow down the dissolution process. In the case of forced convection, the slag penetrated layer was removed at high stirring speeds and partially removed at lower stirring speeds. The removal of the penetrated layer would enhance the dissolution process.

Place, publisher, year, edition, pages
Elsevier.
Keywords [en]
MgO based refractory, slag-refractory reaction, dissolution, dissolution mechanism
National Category
Ceramics Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-214598OAI: oai:DiVA.org:kth-214598DiVA, id: diva2:1141961
Projects
European Union’s Research Fund for Coal and Steel (RFCS) research program [grant agreement No RFSR-CT-2015-00005]
Funder
EU, European Research Council, RFSR-CT-2015-00005
Note

QCR 20170918

Available from: 2017-09-18 Created: 2017-09-18 Last updated: 2017-09-18Bibliographically approved
In thesis
1. A Study on the Reaction between MgO Based Refractories and Slag-Towards the Development of Carbon-free Lining Material
Open this publication in new window or tab >>A Study on the Reaction between MgO Based Refractories and Slag-Towards the Development of Carbon-free Lining Material
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In present thesis, the fundamental studies on the reaction between MgO based refractories and slag were undertaken for the development of a carbon-free bonding MgO lining material. Alumina was selected as a potential binder material. Due to MgO-Al2O3 chemical reaction, the developed refractory was bonded by MgO·Al2O3 spinel phase. To begin with, an investigation of the dissolution process of dense MgO and MgO·Al2O3 spinel in liquid slag was carried out. To obtain reliable information for dissolution study, a new experimental method was therefore developed. In this method, a cylinder was rotating centrally in a special designed container with a quatrefoil profile. This method also showed a good reliability in revealing the dissolution mechanism by quenching the whole reaction system. The experimental results showed that the dissolution process of MgO and spinel was controlled by both mass transfer and chemical reaction. It was found that the rapid dissolution of spinel was mainly because of its larger driving force. To improve the resistance against slag penetration, two aspects were studied to develop carbon-free MgO refractory. First, colloidal alumina was used and the effect of its addition into MgO matrix was investigated. The use of colloidal alumina was to form bonding products in the grain boundary of MgO. The results showed that the alumina addition greatly improved the resistance of MgO based refractory against slag penetration in comparison with the decarburized MgO-carbon refractory. It was found that the improvement of resistance was mainly related to the spinel-slag reaction products of CaO·Al2O3 and CaO·MgO·Al2O3 solid phases at the grain boundaries. Second, the effect of particle size distribution on the penetration resistance of MgO was investigated. The most profound improvement against the slag penetration was obtained by using a proper particle size distribution. The results highlighted the importance of considering the refractory structure. Experiments were undertaken to investigate the dissolution mechanism of different types of MgO based refractories in liquid slag. It was observed that the dissolution of spinel bonded MgO refractory was much slower than the decarburized MgO-carbon refractory. The primary dissolution in spinel bonded MgO refractory occurred at the slag-penetrated layer, and the removal of this layer by peeling off enhanced the dissolution rate rapidly.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. p. 54
Keywords
MgO refractory, lining material, carbon-free, clean steel, ladle glaze, slag penetration, dissolution mechanism
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-214420 (URN)978-91-7729-533-4 (ISBN)
Public defence
2017-10-27, Sal F3, Lindstedtvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Projects
European RFCS LEANSTORY project
Funder
EU, European Research Council, RFSR-CT-2015-00005
Note

QC 20170918

Available from: 2017-09-18 Created: 2017-09-13 Last updated: 2017-09-21Bibliographically approved

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