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Chemical and Crystallographic Properties of Kaolin from Ultisols in Thailand

Published online by Cambridge University Press:  01 January 2024

Wimolnan Kanket ,
Anchalee Suddhiprakarn ,
Irb Kheoruenromne  and
Robert J. Gilkes
Wimolnan Kanket
Affiliation:
Department of Soil Science, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand
Anchalee Suddhiprakarn*
Affiliation:
Department of Soil Science, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand
Irb Kheoruenromne
Affiliation:
Department of Soil Science, Faculty of Agriculture, Kasetsart University, Bangkok 10900, Thailand
Robert J. Gilkes
Affiliation:
School of Earth and Geographical Sciences, Faculty of Natural and Agricultural Science, University of Western Australia, Crawley, WA 6009, Australia
*
*E-mail address of corresponding author: agrals@ku.ac.th
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Abstract

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Eighteen purified kaolin samples from Thai Ultisols were studied by X-ray diffraction, X-ray fluorescence, transmission electron microscopy and BET methods. Minor amounts of inhibited vermiculite, quartz and anatase were general contaminants of the kaolins which had an average chemical composition of 403 g kg−1 Al2O3, 550 g kg−1 SiO2, 25.3 g kg−1 Fe2O3, 15.6 g kg−1 TiO2 and 4.65 g kg−1 K2O on an ignited basis. Appreciable concentrations of Mn, Co, Ni, Cu, Zn, As and Pb were present and most of the Ni, Cu and Zn in the original clay fraction was retained in the deferrated kaolin concentrate. It was not possible to determine if these elements are present as structural ions in kaolin crystals.

The kaolins exhibited a variety of crystal morphologies ranging from sub-micron, euhedral, hexagonal plates to anhedral plates and tubes. Their specific surface areas ranged from 15.9 to 61.4 m2g−1 (mean 44.9 m2g−1) and surface area increased with decrease in crystal size. The cation exchange capacity of the kaolins ranged from 7.2 to 23.4 cmolc kg−1 and surface charge density from 0.16 to 0.99 C m−2 but these values are sensitive to the presence of contaminants. Structural iron ranged from 12.4 to 44.8 g kg−1 Fe2O3 and there was an increase in structural defects towards the soil surface associated with an increase in the amount of structural iron.

Keywords

Crystal ShapeIron SubstitutionKaolinTropical SoilUltisols
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 5 , October 2005 , pp. 478 - 489
Copyright
Copyright © The Clay Minerals Society 2005

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