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The effect of maturation upon the mineralogical and physicochemical properties of illitic-smectitic clays for pelotherapy

Published online by Cambridge University Press:  09 July 2018

C. J . Sánchez ,
J . Parras  and
M. I . Carretero
C. J . Sánchez
Affiliation:
Laboratorio Mineralogía Aplicada, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, 13071, CiudadReal
J . Parras
Affiliation:
Area CC Experimentales, Escuela Universitariade Magisteriode Ciudad Real-Universidadde Castilla-LaMancha, 13071 Ciudad Real
M. I . Carretero*
Affiliation:
Departamento de Cristalografía, Mineralogía y Química Agrícola, Facultad de Química, Universidad de Sevilla, Apdo. 553, 41041 Sevilla, Spain
*
*E-mail: carre@us.es
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Abstract

Illitic-smectitic clays were matured with a ferruginous, bicarbonate-rich and sulphate-rich water for different periods of time (7, 15, 30, 60 and 90 days), and subjected to discontinuous stirring, to test their use in pelotherapy. A progressive degradation of the clay minerals was observed during the maturation process, with a reduction in the illite and smectite crystallinity, in the percentage of smectites and in the phyllosilicate content. The percentage of <2 μm particles also decreased. These modifications caused changes in the clays’ physicochemical properties, which are evident in an increase in their plasticity index and in slower cooling of the peloid, both of which improved the clays’ effect in pelotherapy.

Keywords

illitic-smectitic claysphysicochemical propertiesmaturationpelotherapy
Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 3 , September 2002 , pp. 457 - 463
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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