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Magnesium diffusion in magnetite-olivine diffusion couple during oxidation and reduction: Preliminary laboratory study
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
LKAB, Research & Development, 983 81 Malmberget.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
2012 (English)In: 6th Int. Congress on the Science and Technology of Ironmaking 2012, ICSTI 2012 - Including Proceedings from the 42nd Ironmaking and Raw Materials Seminar, and the 13th Brazilian Symp. on Iron Ore, 2012, Vol. 2, p. 1268-1277Conference paper, Published paper (Refereed)
Abstract [en]

The solid-state diffusion of magnesium through iron oxides is important in understanding the oxidation and reduction of iron ore pellets containing olivine. In this study, a diffusion couple was made of olivine (containing 50% MgO) and magnetite. Initially, experiments were conducted under oxidizing atmosphere at a temperature above 1,250°C. A new 100-micron thick layer of magnesioferrite and 11% Mg now appeared at the interface of the couple. In the oxidized iron oxide layer there was no detectable presence of Mg. Subsequently, the oxidized samples were subject to reduction atmosphere sufficient for formation of wustite. The layers of oxidized magnetite (i.e. hematite) and the magnesioferrite reduced to wustite. In the reduced samples, the magnesium level in the wustite by the interface was found to be 1.5 wt%. At distance of 700-1,000 μm from the olivine boundary, the magnesium levels went below detection limit. A diffusion coefficient was estimated from the data. The implication of these observations in iron ore pellets will be discussed.

Place, publisher, year, edition, pages
2012. Vol. 2, p. 1268-1277
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-40412Local ID: f8c06ce6-0743-4acc-b43c-ae001ea5dd7dISBN: 9781627480215 (print)OAI: oai:DiVA.org:ltu-40412DiVA, id: diva2:1013934
Conference
International Congress on the Science and Technology of Ironmaking : 14/10/2012 - 18/10/2012
Note
Godkänd; 2012; 20130924 (andbra)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved

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Semberg, PärBjörkman, Bo

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