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Enhanced alumina extraction from kaolin by thermochemical activation using charcoal

Published online by Cambridge University Press:  31 January 2022

Amr B. ElDeeb ,
Vyacheslav N. Brichkin ,
Martin Bertau Open the ORCID record for Martin Bertau [Opens in a new window] ,
Mahmoud E. Awad Open the ORCID record for Mahmoud E. Awad [Opens in a new window]  and
Yulia A. Savinova
Amr B. ElDeeb*
Affiliation:
Metallurgy Department, Saint Petersburg Mining University, Saint Petersburg, Russia Mining and Petroleum Department, Faculty of Engineering, Al-Azhar University, Nasr City, 11884, Cairo, Egypt
Vyacheslav N. Brichkin
Affiliation:
Metallurgy Department, Saint Petersburg Mining University, Saint Petersburg, Russia
Martin Bertau
Affiliation:
Institute of Chemical Technology, Freiberg University of Mining and Technology, Freiberg, Germany
Mahmoud E. Awad
Affiliation:
Department of Geology, Faculty of Science, Al-Azhar University, Nasr City, 11884, Cairo, Egypt Andalusian Institute of Earth Sciences (IACT-CSIC), University of Granada, Spain
Yulia A. Savinova
Affiliation:
Pyrometallurgy Laboratory, Gipronickel Institute, Saint Petersburg, Russia
*
*E-mail: [email protected]
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Abstract

The present work aims to increase the alumina percentage recovery (APR) extracted from kaolin via the addition of 0.5–4.0 wt.% charcoal as a thermochemical fluxing agent in the lime-sintering process at 1260–1360°C. The transformation, microstructural and microtextural changes and self-disintegration performance were characterized using thermogravimetric analysis and differential scanning calorimetry, X-ray diffraction/X-ray fluorescence, scanning electron microscopy coupled with energy-dispersive spectroscopy and laser diffraction particle-size distribution analysis. The optimum enhancement of APR, from 77.7% to 87.40%, was obtained by sintering at 1360°C with the addition of 1.5% charcoal. With further increase of the charcoal content to 4%, the APR reduced to 75.6%. Combustion of ≤1.5% charcoal provided additional heat that amorphized the crystalline calcium aluminate into highly leachable amorphous phases with improved self-disintegration efficiency. Sintering at temperatures of >1360°C or with charcoal contents >4% led to mullite crystallization and decreased alumina leachability, thereby reducing the APR. Charcoal is a cost-effective and energy-efficient activator to increase the APR extracted from kaolin.

Keywords

alumina productioncharcoal-based activationkaolinlime-sintering processpyro-hydrometallurgyself-disintegration process
Type
Article
Information
Clay Minerals , Volume 56 , Issue 4 , December 2021 , pp. 269 - 283
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of The Mineralogical Society of Great Britain and Ireland

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Footnotes

Editor: George E. Christidis

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