Dissolution mechanism of dolomite in converter slag at 1873K
2014 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, Vol. 41, no 1, 75-80 p.Article in journal (Refereed) Published
The mechanism of dolomite dissolution in converter slag was studied and found to proceed by two steps: decomposition of dolomite into CaO and MgO and dissolution of the product into the slag. The first step was found to be controlled by heat transfer, which was confirmed by theoretical calculation. The decomposed dolomite had many pores, which allowed easy slag penetration. A discontinuous 2CaO.SiO2 layer along with MgO.Fe2O3 particles was found on the surface of the samples. Some 2CaO.SiO2 islands were found in the vicinity of the samples in the slag, revealing that the dissolution was dominated by peeling-off of the layer of 2CaO.SiO2- MgO.Fe2O3 mixture. 2CaO.SiO2, (Mg, Fe)Oss along with super cooled liquid phases were found inside dolomite samples close to the surface. 2CaO.SiO2 phase was replaced gradually by 3CaO.SiO2 towards the centre of the decomposed sample. While addition of small amounts of dolomite directly into the slag could be considered in steelmaking converter, too much would result in slow dissolution and waste of the raw materials.
Place, publisher, year, edition, pages
2014. Vol. 41, no 1, 75-80 p.
Converter slag, Decomposition, Dissolution, Dolomite
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-101416DOI: 10.1179/1743281212Y.0000000101ISI: 000334114700012ScopusID: 2-s2.0-84893223301OAI: oai:DiVA.org:kth-101416DiVA: diva2:547546
QC 20140317. Updated from submitted to published.2012-08-292012-08-282014-05-09Bibliographically approved