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Structural alteration of sepiolite by dry grinding

Published online by Cambridge University Press:  09 July 2018

J. Cornejo  and
M. C. Hermosin
J. Cornejo
Affiliation:
Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, Apartado 1052, 41080 Sevilla, Spain
M. C. Hermosin
Affiliation:
Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, Apartado 1052, 41080 Sevilla, Spain
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Abstract

The effects of dry grinding on the structure of sepiolite were studied by XRD, surface area measurement, TG-DTA and IR spectroscopy techniques. The results show that the sepiolite framework is rather resistant to mechanical stress and its alteration by dry grinding occurs through three successive, overlapping processes: (i) thinning of the fibrous particles without structural alteration; (ii) distortion of the parallel units of sepiolite fibres, affecting essentially the particle surface which transforms into an amorphous protective coating; (iii) disruption of the inner structure and a prototropy effect, producing an amorphous phase with some residual order.

Information

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 4 , December 1988 , pp. 391 - 398
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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References

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