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The Formation of Illitic Clays from Kaolinite in KOH Solution from 225°C to 350°C

Published online by Cambridge University Press:  28 February 2024

Wuu-Liang Huang
Wuu-Liang Huang*
Affiliation:
Exxon Production Research Company, P.O. Box 2189 Houston, Texas 77252-2189
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Abstract

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Kaolinite was converted into illitic clays in a 2.58 m KOH solution in gold capsules using cold-seal pressure vessels at 225°, 250°, 300°, and 350°C and 500 bars. The XRD shows that the major reaction products are illitic clays with no interlayer expandability. The TEM shows that the illitic clays appear mainly platelet-like with a K/Si ratio close to that of muscovite/illite. The extent of the conversion was monitored by measuring the XRD peak ratio of muscovite (illite) and kaolinite in quenched run products. The results reveal that kaolinite converts to muscovite/illite in the KOH solution at an initial rate two to three orders of magnitude faster than that of similar reactions at near-neutral conditions.

Keywords

IlliteIllite synthesisKaoliniteKinetics
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 6 , December 1993 , pp. 645 - 654
Copyright
Copyright © 1993, The Clay Minerals Society

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