THERMAL INVESTIGATIONS ON ALUNITE AND ITS MIXTURES WITH QUARTZ AND DICKITE

被引:19
作者
KASHKAI, MA
BABAEV, IA
机构
关键词
D O I
10.1180/minmag.1969.037.285.13
中图分类号
P57 [矿物学];
学科分类号
070901 ;
摘要
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 aluminum sulfate and alkali sulfate; then in the prominent 850 C endothermic reaction three- quarters of the sulfate is lost, leaving a mixture of alkali sulfate and /U- alumina. The area of the 850 C endothermic peak may be used as a measure of the percentage of alunite in alunitized rocks.
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页码:128 / &
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