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Stability of sepiolite in neutral and alkaline media at room temperature

Published online by Cambridge University Press:  09 July 2018

S. Martinez-Ramirez ,
F. Puertas  and
M. T. Blanco-Varela
S. Martinez-Ramirez
Affiliation:
Instituto de Ciencias de la Construcción “Eduardo Torroja” (C.S.I.C.), C/Serrano Galvache s/n, Apartado de Correos 19002, 28033 Madrid, Spain
F. Puertas
Affiliation:
Instituto de Ciencias de la Construcción “Eduardo Torroja” (C.S.I.C.), C/Serrano Galvache s/n, Apartado de Correos 19002, 28033 Madrid, Spain
M. T. Blanco-Varela
Affiliation:
Instituto de Ciencias de la Construcción “Eduardo Torroja” (C.S.I.C.), C/Serrano Galvache s/n, Apartado de Correos 19002, 28033 Madrid, Spain
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Abstract

The chemical and structural stability of a Spanish sepiolite from Vallecas, Spain, was studied in 0.04 n NaOH (pH = 12.6), a saturated solution of Ca(OH)2 (pH = 12.6) and deionized/distilled water (pH = 7). The chemical stability was evaluated by determining the concentrations of Mg, Si and Ca in the solid residues during the kinetic test. The structural stability was studied by determining the changes in specific surface area and ‘crystallite’ size. The specific surface was determined by the BET method and the ‘crystallite’ size by the profile of the X-ray diffraction line. The main conclusion was that sepiolite is a material with high chemical stability in neutral and alkaline media, with no significant structural changes. However, in alkaline media, greater dissolution of silica was observed than in neutral media, the silica being derived from the most external tetrahedra attached to the OH− groups.

Type
Research Article
Information
Clay Minerals , Volume 31 , Issue 2 , June 1996 , pp. 225 - 232
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1996

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