Corrosion mechanism of commercial doloma refractories in contact with CaO-Al2O3-SiO2-MgO slag
2008 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, Vol. 35, no 2, 99-107 p.Article in journal (Refereed) Published
The dissolution of three doloma based refractories in liquid CaO-Al2O3-SiO2-MgO slag was studied. Cylindrical refractory specimens of doloma, carbon bonded doloma, and magnesia doloma were rotated in a stationary crucible of molten slag under forced convection conditions. Slag composition, temperature, rod rotation speed and rod immersion time were varied. The refractory dissolution rate was determined from the change in diameter of the cylindrical specimens. The corrosion rate was found to increase with temperature and rod rotation speed and decrease when the slag was nearly saturated with MgO. The findings of the study substantiate the assumption that the diffusion of magnesium oxide through the slag boundary layer controls the corrosion process. The results indicated the overall corrosion process to be the dissolution of refractory material into the slag, followed by slag penetration of the pores and grain boundaries and finally, dispersion of the grains into the slag.
Place, publisher, year, edition, pages
2008. Vol. 35, no 2, 99-107 p.
doloma refractory; molten slag; corrosion rate; corrosion mechanism
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-8489DOI: 10.1179/030192307X232595ISI: 000255125600002ScopusID: 2-s2.0-44649153462OAI: oai:DiVA.org:kth-8489DiVA: diva2:13827
QC 201008132008-05-162008-05-162010-08-13Bibliographically approved