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Red mud from Brazil : thermal behavior and physical properties

Antunes, Maria, Couperthwaite, Sara J., da Conceição, Fabiano, de Jesus, Carolina, Antonio, Pedro, Coelho, Antonio, & Frost, Ray L. (2012) Red mud from Brazil : thermal behavior and physical properties. Industrial and Engineering Chemistry Research, 51(2), pp. 775-779.

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Abstract

The main constituents of red mud produced in Aluminio city (S.P. – Brazil) are iron, aluminium and silicon oxides. It has been determined that the average particle diameter for this red mud is between 0.05 and 0.002mm. It is observed that a decrease in the percentage of smaller particles occurs at temperatures greater than 400°C. This observation corresponds with the thermal analysis and X-ray diffraction (XRD) data, which illustrate the phase transition of goethite to hematite. A 10% mass loss is observed in the thermal analysis patterns due to the hydroxide – oxide phase transitions of iron (primary phase transition) and aluminium (to a lesser extent). The disappearance and appearance of the different phases of iron and aluminium confirms the decomposition reactions proposed by the thermal analysis data. This Brazilian red mud has been classified as mesoporous at all temperatures except between 400 and 500°C where the classification changes to micro/mesoporous.

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9 citations in Scopus
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7 citations in Web of Science®

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ID Code: 48351
Item Type: Journal Article
Additional Information: This article is freely available from the American Chemical Society website 12 months after the publication date. See links to publisher website in this record
Keywords: red mud, thermal analysis, XRD, heat treatment
DOI: 10.1021/ie201700k
ISSN: 0888-5885
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > MACROMOLECULAR AND MATERIALS CHEMISTRY (030300)
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2012 American Chemical Society
Deposited On: 01 Feb 2012 09:07
Last Modified: 02 May 2014 16:36

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