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Investigation of Magnetite Oxidation Kinetics at the Particle Scale
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.ORCID iD: 0000-0002-0873-0476
Indian Institute of Technology Bombay. (Metallurgical Engineering and Material Science)
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.ORCID iD: 0000-0002-2358-7719
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
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2019 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 50, no 1, p. 150-161Article in journal (Refereed) Published
Abstract [en]

The induration of magnetite pellets is a complex physico-chemical process that involves oxidation, sintering, and heat transfer. The thermal- and gas-composition profile that is experienced by the pellet in an induration reactor could result in the formation of a homogenous or heterogeneous pellet structure, which could affect the pellet quality. The oxidation kinetics of magnetite pellets from sintering studies have been studied at two levels, namely, the pellet scale and at the particle scale, and the findings of the latter are presented here. The rate of oxidation of the magnetite concentrate depends primarily on temperature, oxygen content in the oxidizing gas, and particle size. These factors are investigated in this study. It was found that the oxidation of the magnetite concentrate is comprised of two distinct stages, a primary stage with high rates followed by a secondary stage where rates decrease significantly. The isothermal oxidation behavior as analyzed by the Avrami kinetic model was found to fit better than the shrinking-core model. The partially oxidized particles were examined microstructurally to supplement the experimental and model results. The Avrami kinetic model for isothermal oxidation was extended to non-isothermal profiles using the superposition principle, and the model was validated experimentally.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 50, no 1, p. 150-161
Keywords [en]
Oxidation Kinetics, Shrinking Core Mechanism, Avrami Mechanism, Magnetite particle oxidation
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-71839DOI: 10.1007/s11663-018-1459-5ISI: 000456070300016Scopus ID: 2-s2.0-85057526513OAI: oai:DiVA.org:ltu-71839DiVA, id: diva2:1267146
Projects
Investigations on the Physico-Chemical Phenomena during Induration of a Magnetite Pellet
Note

Validerad;2019;Nivå 2;2019-02-01 (johcin) 

Available from: 2018-11-30 Created: 2018-11-30 Last updated: 2019-02-01Bibliographically approved

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Kumar, TK SandeepAhmed, HeshamAndersson, CharlotteBjörkman, Bo

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