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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.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0002-3548-8638
2018 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 38, no 2, p. 789-797Article in journal (Refereed) Published
Abstract [en]

Dissolution of different types of MgO based refractories into molten CaO-Al2O3-MgO-SiO2 slag was studied. 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 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 min. The major dissolution took place between the MgO grains and the liquid in this penetrated layer. The increase of the thickness slowed down the dissolution. In the case of stagnant slag and slag stirred at low speed, the internal mass transfer in the slag penetrated layer is the controlling step. At higher stirring speeds, the slag-penetrated layer was removed. The removal of the penetrated layer would enhance the dissolution process.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2018. Vol. 38, no 2, p. 789-797
Keyword [en]
MgO based refractory, Slag-refractory reaction, Dissolution, Dissolution mechanism
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-220806DOI: 10.1016/j.jeurceramsoc.2017.09.030ISI: 000418211000048Scopus ID: 2-s2.0-85029808952OAI: oai:DiVA.org:kth-220806DiVA, id: diva2:1174693
Note

QC 20180116

Available from: 2018-01-16 Created: 2018-01-16 Last updated: 2018-03-13Bibliographically approved

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Sichen, Du

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