Microstructural characterization of alkali metal mediated high temperature reactions in mullite based refractories
2010 (English)In: Ceramics International, ISSN 0272-8842, Vol. 36, 733-740 p.Article in journal (Refereed) Published
Two types of refractory bricks were used in reaction tests with slag from a production kiln for iron ore pellet production. Electron microscopy was used to characterize morphological changes at the slag/brick interface and active chemical reactions. Phases such as kalsilite, nepheline and potassium β-alumina form, in a layered structure, as a consequence of alkali metals migration in the brick. Larger hematite grains (50–100 μm) in the slag remain at the original slag/brick interface, while smaller grains dissolve and move through the partly dissolved brick bulk, and forms micrometer sized needle-shaped crystals deeper in the lining material. Thermodynamic simulations predict the formation of a solid solution between hematite and corundum which is also observed in the reaction zone after extended time periods.
Place, publisher, year, edition, pages
2010. Vol. 36, 733-740 p.
National CategoryOther Engineering and Technologies not elsewhere specified
IdentifiersURN: urn:nbn:se:liu:diva-52758DOI: 10.1016/j.ceramint.2009.10.018ISI: 000273935100039OAI: oai:DiVA.org:liu-52758DiVA: diva2:285487
J. Stjernberg, B. Lindblom, J. Wikström, M.-L. Antti and Magnus Odén, Microstructural characterization of alkali metal mediated high temperature reactions in mullite based refractories, 2010, Ceramics International, (36), 733-740.
Copyright: Elsevier Science B.V., Amsterdam.