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Cation Exchange Between Mixtures of Clay Minerals and Between a Zeolite and a Clay Mineral

Published online by Cambridge University Press:  01 January 2024

Patrick J. Denny  and
Rustum Roy
Patrick J. Denny
Affiliation:
Pennsylvania State University, University Park, Pa., USA
Rustum Roy
Affiliation:
Pennsylvania State University, University Park, Pa., USA
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Abstract

The electron microprobe has been used to analyse mixtures of fine-grained silicates such as clay minerals in order to determine directly how cations distribute themselves between mixtures of two fine-grained ion-exchanging materials in pure water and in dilute solutions.

Cation distributions have been determined for mixtures of:

  1. (a) a zeolite, faujasite, and the clay mineral in an Arizona bentonite

  2. (b) the clay mineral in an Arizona bentonite and hectorite; and

  3. (c) three synthetic beidellites of varying charge density.

Distributions have been found for varying ratios of Ca to K ions in the suspensions. The results for the faujasite-bentonite mixture show complex behavior and exhibit curves with maxima and minima. For the system bentonite-hectorite most of the Ca goes to the montmorillonite in the bentonite. For the mixture of synthetic beidellites, the results are rather confusing but it appears that the calcium is more associated with the beidellite with the highest exchange capacity. In all these systems, hydrolysis takes place and the hydronium ion plays a part in determining the equilibrium.

Type
General
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 12 , February 1963 , pp. 567 - 580
Copyright
Copyright © The Clay Minerals Society 1963

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Footnotes

Contribution No. 63-50, M. I. Experiment Station, The Pennsylvania State College, University Park, Pennsylvania.

References

Barrer, R. M., Bultitude, F. W., and Sutherland, (1957) Structure of faujasite and properties of its inclusion complexes with hydrocarbons: Trans. Faraday Soc., v. 53, pp. 1111–1123.Google Scholar
Denny, P. J., and White, E. W.: to be published.Google Scholar
Koizumi, M., and Roy, R. (1959) Synthetic montmorillonoids with variable exchange capacity: Am. Min., v. 44, pp. 788–805.Google Scholar
Marshall, C. E. (1954) Multifunctional ionization as illustrated by the clay minerals: Clays and Clay Minerals, Nat'l. Acad. Sci—Naťl. Research Council Pub. No. 327. pp. 364–385.Google Scholar