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Modification of low- and high-defect kaolinite surfaces: implications for kaolinite mineral processing

Frost, Ray L., Horvath, Erzsebet , Mako, Eva , & Kristof, Janos (2004) Modification of low- and high-defect kaolinite surfaces: implications for kaolinite mineral processing. Journal of Colloid and Interface Science, 270(2), pp. 337-46.

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Abstract

A comparison is made of the mechanochemical activation of three low and one high defect kaolinites using a combination of X-ray diffraction, thermal analysis and DRIFT spectroscopy. The effect of mechanochemical alteration of the kaolinites is greatest for the low defect kaolinites. The effectiveness of the mechanochemical treatment is represented by the slope of the d(001)peakwidth-grinding time line. High defect kaolinites are not significantly altered by the grinding treatment. The effect of mechanochemical treatment on peakwidth was independent of the presence of quartz; the quartz acts as an additional grinding medium. The effectiveness of the mechanochemical treatment depends on the crystallinity of the kaolinite. Two processes are identified in the mechanochemical activation of the kaolinite: first the delamination of kaolinite appears to take place in the first hour of grinding and secondly a recombination process results in the reaggregation of the ground crystals. During this process proton hopping occurs and reaction to form water takes place. This water is then adsorbed and coordinated to surface active-sites created during mechanochemical treatment.

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33 citations in Web of Science®

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ID Code: 807
Item Type: Journal Article
DOI: 10.1016/j.jcis.2003.10.034
ISSN: 0021-9797
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher: This journal is available online.
Deposited On: 14 Mar 2005
Last Modified: 29 Feb 2012 23:04

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