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Effect of grinding and water vapour on the particle size of kaolinite and pyrophyllite

Published online by Cambridge University Press:  09 July 2018

E. T. Stepkowska ,
J. L. Pérez–Rodríguez ,
M. C. Jiménez de Haro ,
P. J. Sánchez–Soto  and
C. Maqueda
E. T. Stepkowska
Affiliation:
Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Avda. Américo Vespucio s/n, 41092-Sevilla, Spain
J. L. Pérez–Rodríguez*
Affiliation:
Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Avda. Américo Vespucio s/n, 41092-Sevilla, Spain
M. C. Jiménez de Haro
Affiliation:
Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Avda. Américo Vespucio s/n, 41092-Sevilla, Spain
P. J. Sánchez–Soto
Affiliation:
Instituto de Ciencia de Materiales de Sevilla, Centro Mixto Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Avda. Américo Vespucio s/n, 41092-Sevilla, Spain
C. Maqueda
Affiliation:
Instituto de Recursos Naturales y Agrobiología (CSIC), Apdo. 1052, 41080-Sevilla, Spain
*
*E-mail: [email protected]
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Abstract

The increase in specific surface of kaolinite (K) and pyrophyllite (P) induced by dry grinding in an oscillatory mill, proceeded during storage in water vapour. The average particle thickness, δ, changed from 42 nm (K) and 66 nm (P) in the original materials to 12 nm (K) and 20 nm (P) after water sorption (20 days at relative humidity RH = 1.0, at room temperature and pressure) and to similar values of 13 nm (K) and 16 nm (P) after grinding for 10 min (in agreement with some published data). The action of water molecules on ground clays (at the conditions indicated) resulted in a further decrease in δ. In pyrophyllite, prolonged grinding (30 min) and prolonged action of water molecules (36 days) caused a particle collapse. After pre-storing at RH = 0.5 the successive decrease in δ at RH = 1.0 was smaller.

Keywords

kaolinitepyrophyllitegrindingwater sorptionspecific surfaceparticle thickness
Type
Research Article
Information
Clay Minerals , Volume 36 , Issue 1 , March 2001 , pp. 105 - 114
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2001

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