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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.
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
URL: http://dx.doi.org/10.1180/000985500547025
DOI: 10.1180/000985500547025
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