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Interaction of Kaolinite with Calcite on Heating: III. Effect of Different Kaolinites

Published online by Cambridge University Press:  09 July 2018

R. C. Mackenzie ,
L. Heller-Kallai ,
A. A. Rahman  and
H. M. Moir
R. C. Mackenzie
Affiliation:
Departments of Chemistry and Soil Science, University of Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, Scotland
L. Heller-Kallai
Affiliation:
Department of Geology, Institute of Earth Sciences, The Hebrew University, Jerusalem 91904, Israel
A. A. Rahman
Affiliation:
Departments of Chemistry and Soil Science, University of Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, Scotland
H. M. Moir
Affiliation:
Departments of Chemistry and Soil Science, University of Aberdeen, Meston Walk, Old Aberdeen AB9 2UE, Scotland
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Abstract

The degree of distortion of the calcite endotherm on differential thermal analysis (DTA) curves for kaolinite-calcite mixtures depends on the kaolinite sample used as well as on the factors previously established. Although no two of the ten kaolinite samples employed, even if from the same general locality, produced identical effects under all experimental conditions, a general relationship between locality of origin and degree of distortion was noted. The crystalline species detected in the products of heating, after standing in air at room temperature, included portlandite, calcite, aragonite, vaterite and the high-temperature phases gehlenite, α′-Ca2SiO4, and 12CaO. 7Al2O3. The actual species present again depended on the kaolinite sample. Although the results cannot be directly related to the volatiles evolved along with water on dehydroxylation of the different kaolinites, a tentative explanation is offered on the basis of the effects of the volatiles on the surfaces of the particles present.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 2 , June 1988 , pp. 191 - 203
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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