Abstract
Mixtures of CaCO3 and varying amounts of Na2CO3, K2CO3 and NaCl were subjected separately to thermal analysis. DTG, DTA, TG analyses indicate that the presence of alkali salts in CaCO3 influences its decomposition behaviour. A minimum DTA peak temperature of CaCO3 decomposition is noticed at low concentrations of alkali salts (K2CO3 and Na2CO3); an increase in concentration increases the DTA peak temperature. However, in the case of NaCl no appreciable lowering of the DTA peak temperature of CaCO3 decomposition is observed. Similarly, the minimum temperature at which decomposition completes is found to correspond to the concentration of 1 per cent salt (K2CO3 and Na2CO3) in CaCO3.
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