Hostname: page-component-6bf8c574d5-956mj Total loading time: 0 Render date: 2025-02-25T11:04:10.649Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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.

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

references

Cicel, B. & Kranz, G. (1981) Mechanism of montmorillonite structure degradation by percussive grinding. Clay Miner. 16, 151–162.Google Scholar
Henmi, T. & Yoshinaga, N. (1981) Alteration of imogolite by dry grinding. Clay Miner. 16, 139–149.Google Scholar
Miller, J.G. & Oulton, T.D. (1970) Prototropy effect in kaolinite during percussive grinding. Clays Clay Miner. 18, 313–323.Google Scholar
Miller, J.G. & Oulton, T.D. (1972) Some effects of grinding kaolinite with potassium bromide. Clays Clay Miner. 20, 389–390.Google Scholar
Mingelgrin, U., Kliger, L., Gal, M. & Saltzman, S. (1978) The effect of grinding on the structure and behaviour of bentonite. Clays Clay Miner. 26, 299–307.Google Scholar
Nagata, H., Shimoda, S. & Sudo, T. (1974) On dehydration of bound water of sepiolite. Clays Clay Miner. 22, 285–293.Google Scholar
Papirer, E. & Roland, P. (1981) Grinding chrysotile in hydrocarbons, alcohol and water. Clays Clay Miner. 29, 161–170.Google Scholar
Serna, C., Ahlrichs, J.L. & Serratosa, J.M. (1975) Folding in sepiolite crystals. Clays Clay Miner. 23,452-457.Google Scholar
Yariv, S. (1975) Infrared study of grinding kaolinite with alkaline metal chlorides. Powder Tech. 12,131-138.Google Scholar