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The Effect of Mechanical Treatment on the Crystal Structure and Thermal Behavior of Kaolinite

Published online by Cambridge University Press:  28 February 2024

Éva Kristóf ,
A. Zoltán Juhász  and
István Vassányi
Éva Kristóf
Affiliation:
Department of Silicate Chemistry and Technology, University of Veszprém, P.O. Box 158, H-8201 Veszprém, Hungary
A. Zoltán Juhász
Affiliation:
Department of Silicate Chemistry and Technology, University of Veszprém, P.O. Box 158, H-8201 Veszprém, Hungary
István Vassányi
Affiliation:
Department of Mineralogy, University of Veszprém, P.O. Box 158, H-8201 Veszpræm, Hungary
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Abstract

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The destruction of the crystal structure of kaolinite caused by mechanical forces was investigated by X-ray diffraction, thermal analysis, infrared spectroscopy, and specific surface area determination. Attention was also directed to the change of thermal reactions of milled kaolinite. Grinding experiments for 5 min, 10 min, and 1, 2, 4, 6, and 10 h were carried out in an AGO I planetary mill. After 1 h of grinding, the crystalline order of kaolin is destroyed; but the amorphization continues in the course of prolonged grinding. Grinding for 1 h produces a favorable state for forming mullite-type crystals after heating even at 1000°C.

Keywords

AmorphizationCrystal structureGrindingKaoliniteMechanochemistryThermal behavior
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 5 , October 1993 , pp. 608 - 612
Copyright
Copyright © 1993, The Clay Minerals Society

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