Effects of the Nature of the Exchangeable Cation and Clay Concentration on the Rheological Properties of Smectite Suspensions

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Abstract:

The rheological characteristics of purified bentonite suspensions as a function of exchangeable cation (Ca2+, NH4+, Li+) are studied at three different clay concentrations (40 gL-1,60 gL-1,80 gL-1). A Herschel-Bulkley model is used to determine rheological parameters such as yield value, consistency and fluidification index. The flow curves are typical for shear thinning fluids but differo n two points; presence of yield stress and/or thixotropy.The Li suspensions are not yield stress fluid, and the thixotropy is weakly expressed only for the 80 gL-1 suspension. On the contrary, Ca-clay suspension flow curves always present yield stress and a large thixotropic area. The NH 4-clay suspensions exhibit an intermediate behavior as there is no thixotropy, but a yield stress appears for the most concentrated suspension. These differences in macroscopic mechanical properties are discussed with reference to the suggested microscopic clay organization in suspension.

Keywords: BENTONITE; CLAY SUSPENSIONS; EXCHANGEABLE CATION; MECHANICAL PROPERTIES; MONTMORILLONITE; RHEOLOGY.

Document Type: Research Article

DOI: http://dx.doi.org/10.1346/CCMN.2003.0510608

Publication date: December 1, 2003

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  • The JOURNAL publishes articles of interest to the international community of clay scientists, including but not limited to areas in mineralogy, crystallography, geology, geochemistry, sedimentology, soil science, agronomy, physical chemistry, colloid chemistry, ceramics, petroleum engineering, foundry engineering, and soil mechanics. Clays and Clay Minerals exists to disseminate to its worldwide readership the most recent developments in all of these aspects of clay materials. Manuscripts are welcome from all countries.

    Clays and Clay Minerals is the official publication of The Clay Minerals Society.

    The Editor-in-Chief is Professor Joseph W. Stucki jstucki@illinois.edu

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