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The evolution of textural properties of Na/Ca-bentonite following hydrothermal treatment at 80 and 300ºC in the presence of Fe and/or Fe oxides

Published online by Cambridge University Press:  09 July 2018

A. Neaman ,
D. Guillaume ,
M. Pelletier  and
F. Villiéras
A. Neaman*
Affiliation:
Laboratoire Environnement et Minéralurgie (LEM), Ecole Nationale Supérieure de Géologie, UMR 7569 CNRSINPL, BP 40, 54501, Vandoeuvre-lès-Nancy, France
D. Guillaume
Affiliation:
Géologie et Gestion des Ressources Minérales et Energétiques(G2R), Université Henri Poincaré, UMR 7566CNRS-UHP-INPL-CREGU, BP239, 54506, Vandoeuvrelès-Nancy, France
M. Pelletier
Affiliation:
Laboratoire Environnement et Minéralurgie (LEM), Ecole Nationale Supérieure de Géologie, UMR 7569 CNRSINPL, BP 40, 54501, Vandoeuvre-lès-Nancy, France
F. Villiéras
Affiliation:
Laboratoire Environnement et Minéralurgie (LEM), Ecole Nationale Supérieure de Géologie, UMR 7569 CNRSINPL, BP 40, 54501, Vandoeuvre-lès-Nancy, France
*
*E-mail: [email protected]
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Abstract

The evolution of textural properties of Na/Ca-bentonite from Wyoming (MX-80) was studied by adsorption of nitrogen, water vapour, and ethylene glycol monoethyl ether. Clay suspensions were heated at 80 and 300ºC for up to 9 months in the absence of or in the presence of Fe and/or Fe oxides. The treatment without Fe did not change the textural properties of the samples significantly. The treatment at 80ºC in the presence of Fe resulted in a considerable increase in the external surface areas of the samples. The total and external surface areas and swelling capacities of the samples decreased following the treatment at 300ºC in the presence of Fe and Fe oxides. In the case of larger additions of Fe, the treatment at 300ºC resulted in a considerable decrease in the total and external surface areas and swelling capacity of the sample and in the formation of a network of large-size pores, in which all the pores were connected.

Keywords

textural propertiesbentoniteMX-80nitrogen adsorptionwater vapour adsorptionEGME adsorption.
Type
Research Article
Information
Clay Minerals , Volume 38 , Issue 2 , June 2003 , pp. 213 - 223
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2003

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