Non-Isothermal Degradation Kinetics of CaCO₃ from Different Origin

Table 3

Effect of heating rate on kinetic data for the thermal decomposition of insitu produced CaCO₃.

Heating rate, K min^−1	Calculation procedure
	Coats-Redfern			Madhysudanan-Krishnan-Ninan
	E, kJ mol^−1	A, min^−1	R ^2	E, kJ mol^−1	A, min^−1	R ^2
3	221.2	4.32 × 10^10	0.9986	225.3	4.58 × 10^10	0.9988
6	227.1	8.78 × 10^10	0.9981	231.6	1.21 × 10^11	0.9983
9	238.8	3.01 × 10^11	0.9975	243.1	4.94 × 10^11	0.9974
12	249.6	8.32 × 10^11	0.9968	250.0	9.24 × 10^11	0.9968
Average	234.2 ± 15	3.16 × 10^11	0.9977	237.5 ± 12	3.96 × 10^11	0.9978
		Tang et al.			Wanjun et al.
3	225.2	5.52 × 10^10	0.9988	223.3	4.38 × 10^10	0.9982
6	231.4	1.18 × 10^11	0.9983	229.1	8.89 × 10^10	0.9973
9	243.1	4.94 × 10^11	0.9974	239.4	3.14 × 10^11	0.9968
12	250.1	9.39 × 10^11	0.9968	246.9	8.84 × 10^11	0.9964
Average	237.4 ± 13	4.02 × 10^11	0.9978	234.7 ± 12	3.33 × 10^11	0.9972