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Detection of four different OH-groups in ground kaolinite with controlled-rate thermal analysis |
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| Authors: | Kristóf J Frost R L Kloprogge J T Horváth E Makó É |
| Institution: | (1) Department of Analytical Chemistry, University of Veszprém, H-8201 Veszprém, P.O. Box 158, Hungary;(2) Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, 2 George Street, G.P.O. Box 2434, Brisbane, Q 4001, Australia;(3) Research Group for Analytical Chemistry, Hungarian Academy of Sciences, H-8201 Veszprém, P.O. Box 158, Hungary;(4) Department of Silicate and Materials Engineering, University of Veszprém, H-8201 Veszprém, P.O.Box 158, Hungary |
| Abstract: | The thermal behaviour of mechanochemically treated kaolinite has been investigated under dynamic and controlled rate thermal analysis (CRTA) conditions. Ten hours of grinding of kaolinite results in the loss of the d(001) spacing and the replacement of some 60% of the kaolinite hydroxyls with water. Kaolinite normally dehydroxylates in a single mass loss stage between 400 and 600°C. CRTA technology enables the dehydroxylation of the ground mineral to be observed in four overlapping stages at 385, 404, 420 and 433°C under quasi-isobaric condition in a self-generated atmosphere. It is proposed that mechanochemical treatment of the kaolinite causes the localization of the protons when the long range ordering is lost.This revised version was published online in November 2005 with corrections to the Cover Date. |
| Keywords: | kaolinite controlled-rate thermal analysis (CRTA) dehydroxylation grinding mechanochemical treatment |
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