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Hydrothermal formation of kaolinite from various metakaolins

Lookup NU author(s): Dr Claire Fialips


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Metakaolins formed by total dehydroxylation of kaolinite, dickite and nacrite were hydrothermally treated at 2408C, 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.

Publication metadata

Author(s): Fialips CI, Petit S, Decarreau A

Publication type: Article

Publication status: Published

Journal: Clay Minerals

Year: 2000

Volume: 35

Issue: 3

Pages: 559-572

Print publication date: 01/06/2000

ISSN (print): 0009-8558

ISSN (electronic): 1471-8030

Publisher: Mineralogical Society of Great Britain and Ireland


DOI: 10.1180/000985500547025


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