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Flash calcines of kaolinite: Effect of process variables on physical characteristics

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Abstract

The physical transformation of powdered kaolinite associated with rapid dehydroxylation during flash calcination has been followed using pycnometry, thermogravimetry, electron microscopy, X-ray powder diffraction and infrared spectroscopy. 116 partially dehydroxylated kinetically-frozen calcines were produced in a laboratory flash calciner covering the following ranges of process variables: calciner temperature 700–1000 °C, rate of heating to calciner temperature 4700–15000 Ks−1, residence time at the calciner temperature 0.1–1.5 s, He or N2 calciner atmosphere. From the analyses of these calcines a picture of the changes in physical characteristics caused by flash heating of kaolinite has emerged and is described.

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Authors and Affiliations

  1. Department of Chemistry and School of Engineering, University of Exeter, EX4 4QD, Exeter, UK

    R. C. T. Slade, T. W. Davies, H. Atakül & R. M. Hooper

  2. Laboratoire des Agrégats Moléculaires et Matériaux Inorganiques, URA CNRS 79, Université des Sciences et Techniques du Languedoc, 34060, Montpellier Cedex, France

    D. J. Jones

Authors
  1. R. C. T. Slade
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  2. T. W. Davies
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  3. H. Atakül
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  4. R. M. Hooper
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  5. D. J. Jones
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Slade, R.C.T., Davies, T.W., Atakül, H. et al. Flash calcines of kaolinite: Effect of process variables on physical characteristics. J Mater Sci 27, 2490–2500 (1992). https://doi.org/10.1007/BF01105062

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  • DOI: https://doi.org/10.1007/BF01105062

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