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Effects of dry grinding on pyrophyllite

Published online by Cambridge University Press:  09 July 2018

J. L. Pérez-Rodríguez ,
L. Madrid Sánchez del Villar  and
P.J. Sánchez-Soto
J. L. Pérez-Rodríguez
Affiliation:
Instituto de Ciencias de Materiales, Universidad de Sevilla-CSIC, c/Professor Garcia Gonzalez s/n.Apdo. 1115, 41071-Sevilla
L. Madrid Sánchez del Villar
Affiliation:
Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, Avenida Reina Mercedes s/n. Apdo. 1052, 41080-Sevilla, Spain
P.J. Sánchez-Soto
Affiliation:
Instituto de Recursos Naturales y Agrobiologia de Sevilla, CSIC, Avenida Reina Mercedes s/n. Apdo. 1052, 41080-Sevilla, Spain
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Abstract

Dry grinding of pyrophyllite (Hillsboro, USA) has been studied by X-ray diffraction (XRD), specific surface area measurements (BET) and scanning electron microscopy (SEM). At the beginning of the grinding process, some effects such as delamination, gliding and folding of the layers, and decrease in particle size were detected by SEM and XRD, resulting in a large increase in specific surface area, up to a maximum of ∼60 m2·g−1. Marked changes in the structure take place between 30 and 32 mins grinding. Longer grinding times increase the degree of disorder and SEM and specific surface area data suggest that aggregation occurs. XRD results indicate that some residual order persists in the degraded structure.

Type
Research Article
Information
Clay Minerals , Volume 23 , Issue 4 , December 1988 , pp. 399 - 410
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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