Review on the Oxidation Behaviors and Kinetics of Magnetite in Particle Scale

One possible route for ironmaking process is using a hydrogen‐gas‐based fluidized bed to produce direct reduced iron (DRI), which allows to use the natural magnetite directly in particle scale. The magnetite particles are oxidized during the preheating stage before being charged into the reduction u...

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Bibliographic Details
Published in:Steel research international 2021-08, Vol.92 (8), p.n/a
Main Authors: Zheng, Heng, Schenk, Johannes, Spreitzer, Daniel, Wolfinger, Thomas, Daghagheleh, Oday
Format: Article
Language:English
Subjects:
Crystal structure
Direct reduced iron
Fluidized bed reduction
Fluidized beds
Heating
Hydrogen reduction
Ironmaking
Kinetics
Magnetite
Oxidation
oxidation behaviors
oxidation kinetics
Reaction kinetics
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Summary:One possible route for ironmaking process is using a hydrogen‐gas‐based fluidized bed to produce direct reduced iron (DRI), which allows to use the natural magnetite directly in particle scale. The magnetite particles are oxidized during the preheating stage before being charged into the reduction unit. The exothermic effect, the crystal transformation, and the structural evolution during the oxidation of magnetite are introduced. The oxidation of magnetite is summarized in both thermodynamics and kinetics aspects. Furthermore, the influence of the oxidation of magnetite on its subsequent reduction behavior is examined. The oxidation of magnetite involves exothermic effect, crystal transformation, and structure evolution. The oxidation is a spontaneous reaction from a thermodynamic point of view. Due to the restriction of kinetic conditions, a complete oxidation of magnetite is impossible. The oxidation of magnetite in particle scale is limited by solid‐state diffusion. Lower prior oxidation temperature is beneficial for reduction.
ISSN:1611-3683
1869-344X
DOI:10.1002/srin.202000687