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Effect of added olivine on iron ore agglomerate during induration
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. Central Metallurgical Research and Development Institute (CMRDI).ORCID iD: 0000-0002-2358-7719
Luossavaara-Kiirunavara Aktiebolag (LKAB), Luleå.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
2018 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 58, no 3, p. 446-452Article in journal (Refereed) Published
Abstract [en]

Olivine is used extensively in iron-pellet production as an additive in LKAB blast furnace pellets, in order to improve the high temperature properties of the finished product during reduction. As the contribution of olivine into the process depends on the available surface area, the present study was designed to find out the effect of olivine and its fineness on the oxidation-sintering and subsequent dissociation of olivine in iron ore agglomerates. Agglomerates were exposed to different experimental conditions to study the effect of olivine on the behavior of magnetite and hematite at high temperatures. Olivine particles were found to react significantly only above 1 000°C. Porosity of the final product was found to depend largely on olivine fineness. The finer the olivine the lower the porosity of the final product. It is found also that irrespective of the starting iron oxide the ratio between hematite and spinel phase was the same after heating in air. Olivine fineness affects significantly the rate of hematite dissociation, the finer the olivine the higher the dissociation rate. Upon cooling the weight lost due to the dissociation was again regained

Place, publisher, year, edition, pages
Iron and Steel Institute of Japan , 2018. Vol. 58, no 3, p. 446-452
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-68380DOI: 10.2355/isijinternational.ISIJINT-2017-327Scopus ID: 2-s2.0-85045019266OAI: oai:DiVA.org:ltu-68380DiVA, id: diva2:1198219
Note

Validerad;2018;Nivå 2;2018-04-17 (andbra)

Available from: 2018-04-17 Created: 2018-04-17 Last updated: 2018-04-19Bibliographically approved

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