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Journal of Thermal Analysis and Calorimetry

, Volume 104, Issue 2, pp 635–643 | Cite as

Thermal behavior and evolution of the mineral phases of Brazilian red mud

  • J. M. Rivas MercuryEmail author
  • A. A. Cabral
  • A. E. M. Paiva
  • R. S. Angélica
  • R. F. Neves
  • T. Scheller
Article

Abstract

This article studied the thermal behavior and the evolution of the crystalline phases with temperature of the red mud (bauxite tailing) from an aluminum industry at Maranhão, North-Northwestern Brazil. The experiments were carried out by Field Emission Scanning Electron Microscopy (FE-SEM), Simultaneous Thermal Analysis (TG–DSC), Optical Dilatometry up to 1623 K, and X-ray diffraction (XRD) of previously heated samples between 523 and 1523 K. The crystalline phases and the amorphous contents were quantified on raw and heated samples (at 1523 K) according to the Rietveld Quantitative Analysis (RQA) method. The data obtained showed that the raw red mud is composed by a mixture of seven different phases (hematite, goethite, sodalite, anatase, gibbsite, calcite, and amorphous). Finally in the interval of 1023–1523 K the following crystalline phases: hematite, nepheline, sodalite, anatase, perovskite, and pseudobrookite have been observed.

Keywords

Red mud Bauxite tailing Thermal behavior Rietveld 

Notes

Acknowledgements

The authors wish to thank the Fundação ao Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) and Prof. Dr. José Anchieta Rodrigues at the Materials Engineering Department of The Federal University of São Carlos—São Paulo Brazil.

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2010

Authors and Affiliations

  • J. M. Rivas Mercury
    • 1
    Email author
  • A. A. Cabral
    • 1
  • A. E. M. Paiva
    • 1
  • R. S. Angélica
    • 2
  • R. F. Neves
    • 2
  • T. Scheller
    • 2
  1. 1.Federal Institute of Education Science and Technology of Maranhão—IFMASao LuisBrazil
  2. 2.Geoscience Institute—IGCFederal University of Para (UFPA)BelemBrazil

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