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The rheological and colloidal properties of bentonite dispersions in the presence of organic compounds: II. Flow behaviour of Wyoming bentonite in water-alcohol

Published online by Cambridge University Press:  09 July 2018

T. Permien  and
G. Lagaly
T. Permien
Affiliation:
Institute of Inorganic Chemistry, Kiel University, Olshausenstraβe 40, D-24098 Kiel, Germany
G. Lagaly
Affiliation:
Institute of Inorganic Chemistry, Kiel University, Olshausenstraβe 40, D-24098 Kiel, Germany
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Abstract

The flow behaviour of Wyoming bentonite dispersions was studied in water and water-alcohol mixtures (methanol, ethanol, n-propanol) with or without the addition of NaCl. The yield value τo and relative apparent viscosity τ*rel (= τ* (dispersion/τ* (medium) at γ = 94.5 s-1) increase to a maximum and then decrease with increasing alcohol content. The increase of the flow values is caused by face-to-face aggregation. Formation of band-type networks is a consequence of the enhanced attraction between the silicate layers in water-alcohol mixtures. At higher alcohol contents the bands are contracted to discrete particles. Both effects are considerably strengthened by calcium ions which are present in the crude bentonite.

Type
Research Article
Information
Clay Minerals , Volume 29 , Issue 5 , December 1994 , pp. 761 - 766
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1994

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