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Alteration of smectites induced by hydrolytic exchange

Published online by Cambridge University Press:  09 July 2018

S. Ramirez ,
D. Righi  and
S. Petit
S. Ramirez
Affiliation:
Departamento de Química Agrícola, Geología y Geoquímica, Facultad de Ciencias, Universidad Autónoma de Madrid, Campus Cantoblanco, E-28049 Madrid, Spain Laboratoire “HydrASA”, UMR-CNRS 6532, Faculté des Sciences, F-86022 Poitiers, France
D. Righi*
Affiliation:
Laboratoire “HydrASA”, UMR-CNRS 6532, Faculté des Sciences, F-86022 Poitiers, France
S. Petit
Affiliation:
Laboratoire “HydrASA”, UMR-CNRS 6532, Faculté des Sciences, F-86022 Poitiers, France
*
*E-mail: dominique.righi@hydrasa.univ-poitiers.fr
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Abstract

Hydrolytic exchange was performed experimentally on four smectitic clays to evaluate the extent of clay alteration induced by this process and the associated ‘auto-transformation’ of H+ clays. Clay samples were Na-saturated and submitted to 10, 50 and 100 wetting-drying (WD) cycles and characterized after treatment using X-ray diffraction (XRD), infrared spectroscopy (FTIR) and cation exchange capacity analysis. Evidence for hydrolytic exchange was given by increasing amounts of exchangeable Mg2+ and precipitation of Na soluble salts for samples subjected to 100 WD cycles. Results indicated a decrease in the interlayer charge after 10 WD cycles but no further decrease was observed after 50 and 100 WD cycles. For one sample, XRD data indicated a decrease in the proportion of the smectite phase and a relative increase in the concentration of illite-smectite mixed layers also present in the sample. The results suggested that the reaction induces first a decrease in the layer charge and then a partial dissolution of some smectite layers.

Keywords

hydrolytic exchangesmectite‘auto-transformation’H+ clayslayer chargeXRD
Type
Research Article
Information
Clay Minerals , Volume 40 , Issue 1 , March 2005 , pp. 15 - 24
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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