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Influence of the chemical composition and textural characteristics of palygorskite on the acid leaching of octahedral cations

Published online by Cambridge University Press:  09 July 2018

A. Corma ,
A. Mifsud  and
E. Sanz
A. Corma
Affiliation:
Instituto de Catálisis y Petroleoquímica CSIC, Serrano 119, 28006 Madrid
A. Mifsud
Affiliation:
Instituto de Ciencia de Materiales, CSIC, Serrano 115, bis, 28006 Madrid, Spain
E. Sanz
Affiliation:
Instituto de Catálisis y Petroleoquímica CSIC, Serrano 119, 28006 Madrid
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Abstract

Leaching of two palygorskites with different octahedral aluminium contents has been carried out in HCl at 20°–70°C. The acid concentration was varied in the range 0·05–6 mol. 1−1, using 4–500 g.g−1 liquid to solid ratios. Acid leaching of up to 60% of the octahedral cations did not provoke structural changes or amorphization of the samples. On the bases of the selectivity of extraction of Mg2+, Fe3+ and Al3+, it appeared that most of the octahedral edge positions are occupied by Mg2+, some by Fe3+, and practically none by Al3+. Differences in acid-leaching behaviour between the two palygorskites was better related to accessible surface than chemical composition.

Type
Research Article
Information
Clay Minerals , Volume 22 , Issue 2 , June 1987 , pp. 225 - 232
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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