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Acid and alkali treatment of kaolins

Published online by Cambridge University Press:  09 July 2018

M. Pentrák ,
J. Madejová  and
P. Komadel
M. Pentrák*
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-845 36 Bratislava, Slovakia
J. Madejová
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-845 36 Bratislava, Slovakia
P. Komadel
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-845 36 Bratislava, Slovakia
*
*E-mail: martin.pentrak@savba.sk
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Abstract

Two kaolins containing kaolinites of different crystallinity, as confirmed by the Aparicio-Galán-Ferrell index, were treated in HCl and KOH solutions at 95º and 80ºC, respectively, for periods up to 36 h. Changes resulting from the treatments have been characterized by several methods. Fe occurs in the octahedral sheets of both kaolinites and dissolves similarly to Al. Lower structural ordering, more structural defects and particles of smaller average size and less regular shape are responsible for faster dissolution of KGa-2 in comparison to well ordered Gold Field (Tanzania) kaolinite. More Si than Al is dissolved in KOH from both kaolins after any dissolution time. An aluminosilicate (feldspathoid) phase is thought to occur in the material prepared from KGa-2 in KOH. Near-IR spectra provide very useful information on changes in the mineral structure upon the treatments, on the solid reaction products and on the adsorbed water molecules.

Keywords

kaolinitestructural orderingdissolutionstructural modificationnear-IR spectroscopyX-ray diffraction
Type
Research Article
Information
Clay Minerals , Volume 44 , Issue 4 , December 2009 , pp. 511 - 523
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2009

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