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Thermal investigations on alunite and its mixtures with quartz and dickite

Published online by Cambridge University Press:  05 July 2018

M.-A. Kashkai  and
I. A. Babaev
M.-A. Kashkai
Affiliation:
Ulitsa Husi Hadzhieva II, apt. 6, Baku-5, U.S.S.R.
I. A. Babaev
Affiliation:
Ulitsa Husi Hadzhieva II, apt. 6, Baku-5, U.S.S.R.
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Summary

The thermal decomposition of alunite and of mixtures of alunite with dickite or quartz or both has been studied, and X-ray determinations of the products at various stages of the decomposition have been made. Between 600 and 700°C the product from alunite is a mixture of anhydrous alum and amorphous alumina; between 700 and 770°C the anhydrous alum breaks down into aluminium sulphate and alkali sulphate; then in the prominent 850°C endothermic reaction three-quarters of the sulphate is lost, leaving a mixture of alkali sulphate and γ-alumina. The area of the 850 °C endothermic peak may be used as a measure of the percentage of alunite in alunitized rocks (alunite-quartz-dickite mixtures).

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 285 , March 1969 , pp. 128 - 134
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1969

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