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Clay Minerals; March 2001; v. 36; no. 1; p. 105-114
© 2001 Mineralogical Society of Great Britain and Ireland
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Research Paper

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

E. T. STEPKOWSKA1, J. L. PÉREZ-RODRÍGUEZ1,*, M. C. JIMÉNEZ de HARO1, P. J. SÁNCHEZ-SOTO1 and C. MAQUEDA2

1 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, and 2 Instituto de Recursos Naturales y Agrobiología (CSIC), Apdo. 1052, 41080-Sevilla, Spain

* E-mail: jlperez{at}cica.es

(Received 15 December 1999; revised 26 July 2000)

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, {delta}, 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 {delta}. 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 {delta} at RH = 1.0 was smaller.

KEYWORDS: kaolinite, pyrophyllite, grinding, water sorption, specific surface, particle thickness




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