Abstract
Thermographic investigations of the datolite concentrate established two endothermic effects. The first (maximum about 730~ is connected with the dehydration of the datolite and the formation of calcium orthosilicate, bredigite;the second (maximum about 930~ the decomposition of the calcium orthosilicate, and the appearance of calcium metasilicate, wollastonite, which with rise in temperature is converted into parawollastonite. At about 1000~ sintering and partial fusion of the datolite concentrate commence, and upon the attainment of 1200~ there forms a structurally stable, noncrystallizing glass phase.
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