THERMAL SCIENCE

International Scientific Journal

Yi Man

,

Jun-Xiao Feng

,

Zhan-Min Yang

,

Zeng-Lu Song

,

Chao Yang

EFFECT OF GAS COMPOSITION AND TEMPERATURE ON REDUCTION CHARACTERISTIC IN RED MUD-COAL COMPOSITE PELLETS

ABSTRACT
The disposal of red mud, which is the by-product obtained from alumina production, has brought about environmental pollution because of its caustic nature as well its metal and alkaline contents. Red mud-coal composite pellets were directly reduced to deal with red mud. The influences of reduction temperature and gas composition on the reaction were studied. Experiment results indicated that the optimum reaction parameters were a temperature of 1100°C and an H2 atmosphere. Reduction degrees in H2 and CO atmospheres were significantly higher than those in N2 atmosphere. Reduction did not strictly follow the Fe2O3 → Fe3O4 → FeO → Fe sequence in N2 atmosphere, and this phenomenondid not occur in H2 atmosphere. This gas–solid combination reduction process is appropriate for recovering Fe from Bayer red mud. Meanwhile, the microstructure and phase transformation of the reduction process were investigated via scanning electron microscopy and X-ray diffraction.
KEYWORDS
reduction characteristics, red mud, direct reduction, Bayer process, kinetics analysis
PAPER SUBMITTED: 2018-11-23
PAPER REVISED: 2019-01-20
PAPER ACCEPTED: 2019-01-25
PUBLISHED ONLINE: 2019-05-18
DOI REFERENCE: https://doi.org/10.2298/TSCI181123144M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 5, PAGES [2561 - 2568]
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Effect of gas composition and temperature on reduction characteristic in red mud-coal composite pellets

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence