Thermal decomposition reaction kinetics of hematite ore

Journal article (2020)

Authors

Z. Chen (OLD) MSE-3
Christiaan Zeilstra Tata Steel Europe Limited
Jan van der Stel Tata Steel Europe Limited
J. Sietsma (OLD) MSE-3 , Materials Science and Engineering
Y. Yang (OLD) MSE-3
Department
Materials Science and Engineering
Copyright: © 2020 Z. Chen, Christiaan Zeilstra, Jan van der Stel, J. Sietsma, Y. Yang
DOI: https://doi.org/10.2355/isijinternational.ISIJINT-2019-129
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Published Date

2020

Language

English

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Department

Materials Science and Engineering

Abstract

In order to understand the thermal decomposition kinetics of hematite particles in inert atmosphere, thermogravimetriy was employed for isoconversional analysis. The kinetic triplet was estimated from the experimental data and the isothermal reaction kinetics was predicted. The results indicated that the thermal decomposition could be divided into two stages, of which the activation energies were 636 kJ/mol and 325 kJ/mol, respectively. The exponential form of pre-exponential factor, ln(A/s−1), for the two stages were estimated to be 42.9±6.6 and 14.1±3.08. At last, the kinetic mechanism of the first stage was suggested to match Sestak-Berggren model as f(α)=(1−α)1.38. The relatively slow reaction rate of the second stage was due to the slag formation during the reaction.