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Clay Minerals; June 2003; v. 38; no. 2; p. 213-223; DOI: 10.1180/0009855033820090
© 2003 Mineralogical Society of Great Britain and Ireland
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The evolution of textural properties of Na/Ca-bentonite following hydrothermal treatment at 80 and 300°C in the presence of Fe and/or Fe oxides

A. NEAMAN1, D. GUILLAUME2, M. PELLETIER1 and F. VILLIÉRAS1,*

1 Laboratoire Environnement et Minéralurgie (LEM), Ecole Nationale Supérieure de Géologie, UMR 7569 CNRS-INPL, BP 40, 54501, Vandoeuvre-lès-Nancy, France, and 2 Géologie et Gestion des Ressources Minérales et Energétiques (G2R), Université Henri Poincaré, UMR 7566 CNRS-UHP-INPL-CREGU, BP 239, 54506, Vandoeuvre-lés-Nancy, France

* E-mail: frederic.villieras{at}ensg.inpl-nancy.fr

(Received 15 February 2002; revised 20 November 2002)

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 300°C 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 80°C 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 300°C in the presence of Fe and Fe oxides. In the case of larger additions of Fe, the treatment at 300°C 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 properties, bentonite, MX-80, nitrogen adsorption, water vapour adsorption, EGME adsorption






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