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Interactions between hydroxy-aluminium species and homoionic Na- and Ca-montmorillonite particles, as manifested by ζ potential, suspension stability and X-ray diffraction

Published online by Cambridge University Press:  09 July 2018

J. Y. Bottero ,
M. Bruant  and
J. M. Cases
J. Y. Bottero
Affiliation:
Centre de Recherche sur la Valorisation des Minerais (ENSG)—U.A. 235 (CNRS), B.P. 40, 54501 Vandoeuvre Cédex, France
M. Bruant
Affiliation:
Centre de Recherche sur la Valorisation des Minerais (ENSG)—U.A. 235 (CNRS), B.P. 40, 54501 Vandoeuvre Cédex, France
J. M. Cases
Affiliation:
Centre de Recherche sur la Valorisation des Minerais (ENSG)—U.A. 235 (CNRS), B.P. 40, 54501 Vandoeuvre Cédex, France
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Abstract

The interactions between and higher molecular weight hydroxy-Al species with homoionic Na- and Ca-montmorillonite have been studied by measuring adsorption of the hydroxy-Al on to the clay, turbidity of the resulting suspensions, electrokinetic potential, and d(001) basal spacing. The isolated “Al13” ions are adsorbed according to a cation-exchange process which causes flocculation of the tactoids at low concentrations. At higher concentrations, the adsorption of either isolated “Al13” or/and higher molecular weight species is mainly responsible for the dispersion of clay particles with a net positive surface charge (ζ ∼ + 50 mV). Consequently, the tactoids are destroyed.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 2 , June 1988 , pp. 213 - 224
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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