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Influence of Ionic Environment and pH on the Electrokinetic Properties of Ball Clays

Published online by Cambridge University Press:  28 February 2024

Carmen Galassi
Affiliation:
IRTEC-CNR, Via Granarolo 64, 1-48018, Faenza (RA), Italy
Anna Luisa Costa
Affiliation:
IRTEC-CNR, Via Granarolo 64, 1-48018, Faenza (RA), Italy
Paolo Pozzi
Affiliation:
Dip. di Chimica, Università di Modena e Reggio Emilia, Via Campi 183, I-41100 Modena, Italy
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Abstract

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Three ball clays (SP from England, TSMA from France and UK from the Ukraine) were characterized for their dry and wet colloidal properties. On the basis of X-ray diffraction and chemical analyses the clays were classified as kaolinite-rich clay, smectitic kaolinite-rich clay and illitic kaolinite-rich clay. The ζ (zeta) potential at the clay-water interface as a function of pH, in three different electrolytes, was investigated using an electroacoustic technique. Starting from measurements of dynamic mobility, the calculated ζ potential was found to be almost constant as a function of pH for the TSMA and UK clays, while it increased from −20 to −60 for the SP clay, when potassium nitrate was used as an electrolyte. The behavior of the three clays in calcium and magnesium nitrate was slightly different: SP showed a smaller increase in ζ potential, while a small deviation from the constant behavior of the UK clay was found. The results are explained in terms of the surrounding-ion atmosphere in light of the chemical-physical properties measured. Our results may well be of use to those involved in ceramic processing.

Type
Research Article
Copyright
Copyright © 2001, The Clay Minerals Society

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