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Energy changes when kaolin minerals are heated

Published online by Cambridge University Press:  14 March 2018

F. Vaughan
F. Vaughan*
Affiliation:
British Ceramic Research Association, Stoke on Trent
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Abstract

The work outlined in this paper was undertaken to show how, by a consideration of the energy changes involved, some insight may be gained into the reactions occurring when kaolin minerals are heated.

Activation energies have been determined experimentally for the dehydration of various kaolin minerals. The fireclay mineral is distinctive and it is suggested that it does not form part of a halloysitekaolinite series. It is further thought possible that there is a series of fireclay minerals.

From thermochemical and thermodynamic considerations the heat of formation of kaolinite has been calculated approximately and enthalpy and free energy changes have been estimated for the exothermic reaction at 980°C. These indicate that, if a compound is produced during dehydration, the most probable explanation of the exothermic reaction is the simultaneous production of mullite, γAl2O3 and SiO2. Finally the lattice energies of kaolinite and its thermal decomposition products have been calculated.

Type
Research Article
Information
Clay Minerals Bulletin , Volume 2 , Issue 13 , December 1955 , pp. 265 - 274
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1955

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