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Low Temperature Experimental Investigation of the Effect of High pH Naoh Solutions on the Opalinus Shale, Switzerland

Published online by Cambridge University Press:  28 February 2024

J. A. Chermak
J. A. Chermak*
Affiliation:
Mineralogisch-Petrographisches Institut, Universtät Bern, Baltzerstrasse 1, CH - 3012 Bern, Switzerland
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Abstract

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Batch reactor experiments were performed at 150°C, 175°C, and 200°C to determine the effect of high pH NaOH solutions on the mineralogy of the Opalinus shale. In these experiments, the change in solution quench pH at 25°C, solution composition, and mineralogy were monitored as a function of time for up to ≈40 days. Runs were performed in 50 ml titanium hydrothermal reactor vessels. Each reactor was charged with 0.5–5.0 g of the 80–200 mesh size fraction of Opalinus shale, and 25 ml of solution (0.1 and 0.01 M NaOH). The general sequence of reaction products observed under these high pH conditions include first the formation of analcime, followed by vermiculite, and finally Na-rectorite formation.

Keywords

AnalcimeExperimental investigationHigh pHNa-rectoriteOpalinus shaleVermiculite
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 6 , December 1992 , pp. 650 - 658
Copyright
Copyright © 1992, The Clay Minerals Society

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