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Methods of analysing morphology of kaolinites: relations between crystallographic and morphological properties

Published online by Cambridge University Press:  09 July 2018

J.M. Cases
Affiliation:
Centre de Recherche sur la Valorisation des Minerais de l'Ecole Nationale Supérieure de Géologie et Laboratoire Associé du CNRS no.235 “Minéralurgie”, B.P. 40, 54501 Vandoeuvre Cédex
P. Cunin
Affiliation:
Talcs de Luzenac S.A., 09250 Luzenac
Y. Grillett
Affiliation:
Centre de Thermodynamique et de Microcalorimétrie du CNRS, 26 rue du 141 ème R.I.A., 13003 Marseille Cédex, France
C. Poinsignon
Affiliation:
Centre de Recherche sur la Valorisation des Minerais de l'Ecole Nationale Supérieure de Géologie et Laboratoire Associé du CNRS no.235 “Minéralurgie”, B.P. 40, 54501 Vandoeuvre Cédex
J. Yvon
Affiliation:
Centre de Recherche sur la Valorisation des Minerais de l'Ecole Nationale Supérieure de Géologie et Laboratoire Associé du CNRS no.235 “Minéralurgie”, B.P. 40, 54501 Vandoeuvre Cédex

Abstract

A study was made of the extent to which the lateral surfaces contribute to the surface area of five kaolinites of different crystallinities. Methods used included the low-temperature adsorption of N2 and Ar as measured by a volumetric technique coupled with microcalorimetry, the interpretation of the adsorption isotherms of alkyldodecylammonium ions, particle-size distribution curves, and shadowed transmission electron microscopy. With the exception of surfactant adsorption and adsorption calorimetry using Ar, these methods gave different and debatable results. For instance, specific lateral surface area values expressed as a percentage of total specific surface area varied from 17·0 to 40·4% for the most crystalline sample and from 12·0 to 54·3% for the least crystalline. It is shown that the decrease in crystallinity of samples is accompanied by a reduction in crystallite size from 0·8 to 0·08 µm and a decrease in lateral surface area from 34·0 to 12·0%.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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References

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