Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by FIALIPS, C.-I. Articles by DECARREAU, A. Search for Related Content GeoRef GeoRef Citation

Hydrothermal formation of kaolinite from various metakaolins

Laboratoire Hydr’ASA, UMR6532-CNRS, Université de Poitiers, 40 avenue du Recteur Pineau, F-86022 Poitiers Cedex, France

^* E-mail: sabine.petit{at}hydrasa.univ-poitiers.fr

(Received 17 June 1999; revised 2 November 1999)

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: kaolinite, FTIR, metakaolin, synthesis, TEM, XRD

This article has been cited by other articles:

				C.-I. Fialips, C.-I. Fialips, J. Majzlan, D. Beaufort, and A. Navrotsky New thermochemical evidence on the stability of dickite vs. kaolinite American Mineralogist, May 1, 2003; 88(5-6): 837 - 845. [Abstract] [Full Text] [PDF]

				C.-I. Fialips, A. Navrotsky, and S. Petit Crystal properties and energetics of synthetic kaolinite American Mineralogist, March 1, 2001; 86(3): 304 - 311. [Abstract] [Full Text] [PDF]