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Electron Optical Study of the Thermal Decomposition of Kaolinite

Published online by Cambridge University Press:  09 July 2018

J. D. C. McConnell  and
S. G. Fleet
J. D. C. McConnell
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge
S. G. Fleet
Affiliation:
Department of Mineralogy and Petrology, Downing Place, Cambridge
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Abstract

The electron microscope has been used to study the mechanisms of thermal decomposition of kaolinite in the temperature range 800-1350°C. Three main reaction mechanisms appear to be important in this temperature range. At 850°C metakaolinite breaks down to produce an amorphous defect oxide phase which is homogeneous and finely porous. When heated at 900°C the reaction product is a defect spinel with strongly preferred orientation and microporous structure. This defect spinel phase is observed in the temperature range 900-1150°C and shows little change in microstructure throughout this temperature range where the secondary development of muUite also occurs to a limited extent. Above 1150°C mullite develops in quantity and appears to represent the bulk of the reaction product at 1200°C.

Type
Research Article
Information
Clay Minerals , Volume 8 , Issue 3 , July 1970 , pp. 279 - 290
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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