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Synthesis of Clay Minerals at Low Temperatures

Published online by Cambridge University Press:  01 January 2024

S. Henin
S. Henin*
Affiliation:
Soils Laboratory, Versailles, France
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Abstract

Numerous attempts have shown that it seems to be impossible to crystallize co-precipitates of silica and hydroxides; we therefore attempted to prepare clay minerals starting from solutions of their constituents. By allowing these dilute solutions (tenths of milligrams per liter) to pass slowly into a flask containing distilled water, it has been possible to prepare substances similar to clay minerals. These have been identified by x-rays, chemical analysis, dehydration curves, and electron micrographs.

Using as cations Mg, Fe2+, Fe3+, and Ni, minerals of the montmorillonite type have been prepared for various pH values (generally greater than 7). Below this, value, depending on the cations; oxides, hydroxides, or amorphous materials are obtained.

Under certain conditions in the absence of silica the glass vessel was attacked, and anti-gorites of Mg and Ni were then obtained. Always when the supply of silica was small, and with the cation introduced in the form of a very dilute solution, the process gave rise to montmorillonite. In the presence of K, illites were sometimes formed.

The method seems to be of very general application. Only the purely aluminum minerals offer difficulties of preparation. The significance of these results is discussed.

Type
Article
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 4 , February 1955 , pp. 54 - 60
Copyright
Copyright © The Clay Minerals Society 1955

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References

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