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A Comparative Study of Thermal Effects on Surface and Structural Parameters of Natural Californian and Quebec Chrysotile Asbestos up to 700°C

Published online by Cambridge University Press:  01 July 2024

William J. Murphy  and
Robert A. Ross
William J. Murphy
Affiliation:
Department of Chemistry, Lakehead University, Thunder Bay, Ontario, Canada, P7B 5E1
Robert A. Ross
Affiliation:
Department of Chemistry, Lakehead University, Thunder Bay, Ontario, Canada, P7B 5E1
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Abstract

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The effect of heat treatment on surface area, pore volume, pore size distribution, physical and chemical structure up to 700°C have been studied on samples of naturally occurring chrysotile minerals from California and Quebec. Techniques used included thermogravimetric analysis, low-temperature nitrogen adsorption, electron microscopy, X-ray powder and electron diffraction. The materials behaved similarly on heating to 100°C showing a 0.5% weight loss attributable to desorption of physisorbed water. At 500°C, Quebec samples retained the chrysotile crystal structure while Californian samples were X-ray amorphous. Forsterite was formed by dehydration of both chrysotiles at 700°C; the greater stability of the Quebec samples to this process is explained by the presence of brucite as an impurity which enters into stray solid-solid interactions with the chrysotile.

Type
Research Article
Information
Clays and Clay Minerals , Volume 25 , Issue 2 , April 1977 , pp. 78 - 89
Copyright
Copyright © Clay Minerals Society 1977

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