Abstract
The thermal decompositoon of calcium carbonate mixed with calcium fluoride was examined by means of simultaneous TG, DTG and DTA. The temperature range of CaCO3 decomposition shifted to higher temperatures as a result of CaCO3-CaF2 eutectic formation. The temperature of melting of this eutectic was in the temperature range of CaCO3 decomposition, and therefore all factors which increase the partial pressure of CO2 (such as the thickness of the sample layer, the shape of the crucible, the heating rate, etc.) influence the amount of the liquid phase. The DTA curves can be regarded as the sum of three endothermic effects occurring almost simultaneously: decomposition of CaCO3 in the solid phase, melting of the eutectic, and decomposition of CaCO3 present in the liquid phase.
Published Version
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