Kinetics of Incomplete Reduction of Hematite Low Grade Iron Ore to Magnetite Using Mixture of CO and CO2

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Heidari, Aidin | 1398

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 52917 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Halali, Mohammad
Abstract:
In this research the process of incomplete reduction of hematite low iron ore to magnetite in a fluidized bed reactor was investigated. Temperature, composition of reduction air, particle size, and stay time were investigated as effective parameters. In this way, temperatures of 560, 580, 600, 620 and 640 degrees of centigrade, input air with flows of 1.2, 1.3 and 1.4 l/s, particles size of 425-850 µm, 850 µm-1.4 mm, and 1.4-2 mm, stay times of 4, 8, 12, 16, and 20 min were used in this research. The reduced specimens were analyzed by XRD and chemical analysis. The results illustrated that increase of temperature, decrease of input air flow, decrease of particles size, and increase of stay time help progress of reduction reaction. Temperature of 640 degrees of centigrade, stay time of 20 min, input air flow of 1.2 l/s, and particles size of 850 µm-1.4 mm caused formation of 69.36% magnetite. Finally, the Kinetics of the reaction was investigated using shrinking core model (SCM), and it was realized that chemical reaction control is the Kinetics controller of the reaction
Keywords:
Magnetite ; Fluidized Bed ; Partial Reduction ; Reaction Kinetics ; Hematite Low Grade Iron Ore