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Hydrothermal formation of kaolinite from various metakaolins

Published online by Cambridge University Press:  09 July 2018

C. - I . Fialips ,
S. Petit  and
A. Decarreau
C. - I . Fialips
Affiliation:
Laboratoire Hydr'ASA, UMR6532-CNRS, Université de Poitiers, 40 avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
S. Petit*
Affiliation:
Laboratoire Hydr'ASA, UMR6532-CNRS, Université de Poitiers, 40 avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
A. Decarreau
Affiliation:
Laboratoire Hydr'ASA, UMR6532-CNRS, Université de Poitiers, 40 avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
*
*E-mail: sabine.petit@hydrasa.univ-poitiers.fr
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Abstract

Metakaolins formed by total dehydroxylation of kaolinite, dickite and nacrite were hydrothermally treated at 240°C, for 2, 21 or 182 days, at initial pH = 5– 6 or 1. Kaolinite was the only mineral of the kaolin subgroup crystallized in these treatments. Kaolinite is less ordered for pH = 4– 6 than for pH = 1. This can be attributed to the influence of specific chemical, morphological, and/or crystalline properties of the metakaolins. Two different processes of kaolinite formation and crystal growth must be involved depending on the pH and metakaolin. The first process implies the dissolution of the metakaolin and crystallization of thin prismatic or dendritic kaolinite particles which curl, probably due to surface tension. The second process implies the rapid formation of small pseudohexagonal kaolinite particles which would aggregate and coalesce to form bigger particles.

Keywords

kaoliniteFTIRmetakaolinsynthesisTEMXRD
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 3 , June 2000 , pp. 559 - 572
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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