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Synthesis of zeolites from thermally activated kaolinite. Some observations on nucleation and growth

Published online by Cambridge University Press:  09 July 2018

M. Murat ,
A. Amokrane ,
J. P. Bastide  and
L. Montanaro
M. Murat
Affiliation:
Institut National des Sciences Appliquées (INSA) de Lyon, Groupe Métallurgie Physique et Physique des Matériaux (UA CNRS N° 341), Laboratoire de Chimie-Physique Appliquée et Environnement, and Laboratoire de Thermochimie Minérale, 20 Av. Albert Einstein, 69621 Villeurbanne, France
A. Amokrane
Affiliation:
Institut National des Sciences Appliquées (INSA) de Lyon, Groupe Métallurgie Physique et Physique des Matériaux (UA CNRS N° 341), Laboratoire de Chimie-Physique Appliquée et Environnement, and Laboratoire de Thermochimie Minérale, 20 Av. Albert Einstein, 69621 Villeurbanne, France
J. P. Bastide
Affiliation:
Institut National des Sciences Appliquées (INSA) de Lyon, Groupe Métallurgie Physique et Physique des Matériaux (UA CNRS N° 341), Laboratoire de Chimie-Physique Appliquée et Environnement, and Laboratoire de Thermochimie Minérale, 20 Av. Albert Einstein, 69621 Villeurbanne, France
L. Montanaro
Affiliation:
Politecnico di Torino, Dipartimento dei Materiali ed Ingegneria Chimica, Corso Duca degli Abruzzi 24, 10129 Torino, Italia
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Abstract

Depending on the preparation temperature and the origin of the raw mineral, the products obtained by thermal activation of kaolinite lead, by hydrothermal treatment with sodium hydroxide at 102°C, either to zeolite 4A, or to cubic zeolite P, or to a mixture of cubic and tetragonal zeolite P. The change in the type of zeolite obtained was explained on the basis of a radical change of the zeolite nucleation process due to either the presence of soluble potassium or high silica content resulting from dehydration of muscovite (an impurity in the raw-kaolinite), or from “segregation” associated with the first step of the metakaolinite to mullite transformation. These phenomena occur at a lower calcination temperature with poorly-crystallized kaolinite, and iron in such a sample promotes a sensitive decrease in the formation rate of zeolite crystals. Such results could be used to characterize the crystallinity of kaolinites.

Type
Research Article
Information
Clay Minerals , Volume 27 , Issue 1 , March 1992 , pp. 119 - 130
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1992

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