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Study of the Mechanism and Kinetics of the Restoration of Hematites

  • KINETICS AND MECHANISM OF CHEMICAL REACTIONS, CATALYSIS
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Abstract

The effect of the reduction of hematite to magnetite on the strength characteristics of iron ore materials used in blast furnaces and shaft metallization furnaces is established. The mechanism and kinetics of the process of the reduction of hematite on samples of various sizes, taking into account the effect of the temperature and composition of the gas phase on it, are studied. The electrochemical behavior of samples from various hematites is considered, which makes it possible to judge the degree of defectiveness of the structure of the initial iron oxide. A dilatometric setup is used to study the change in the size of the hematite samples during the reduction heat treatment. Mineralogical and X-ray structural analyses are carried out, the results of which are used in carrying out kinetic analysis, which makes it possible to explain the main regularities and mechanisms of the processes during the reduction of hematite to magnetite. To describe such processes, equations for a contracting sphere are used. The values of the specific rates of the transition of hematite into magnetite at different contents of carbon monoxide in the atmosphere are analyzed. The results obtained are of interest and make it possible to develop technologies, which ensure the preservation of the initial magnetite in iron ore concentrates during its heat treatment, or to transfer the beginning of the reduction of hematite in blast furnaces and shaft metallization furnaces to the region of higher temperatures.

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Authors and Affiliations

  1. Yeltsin Ural Federal University, Yekaterinburg, Russia

    B. P. Yur’ev & V. A. Dudko

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  1. B. P. Yur’ev
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  2. V. A. Dudko
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Correspondence to B. P. Yur’ev.

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Yur’ev, B.P., Dudko, V.A. Study of the Mechanism and Kinetics of the Restoration of Hematites. Russ. J. Phys. Chem. B 16, 31–38 (2022). https://doi.org/10.1134/S1990793122010171

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  • DOI: https://doi.org/10.1134/S1990793122010171

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