Effects of Pyrrhotite on the Combustion Behavior and the Kinetic Mechanism of Pyrite-Pyrrhotite Mixture Powders in the Air

Table 2

Calculated values of three kinds of ore samples in different stages of combustion.

Sample type	Reaction stages	Function name	Mechanism	/kJ·mol^−1
Pyrite	I	Third order	Chemical reaction, F3, deceleration type a-t curve	1.42
	II	Avrami–Erofeev equation	Random nucleation and subsequent growth (n = 4)	194.81
	III	Reaction order	n = 4	8.04
	IV	Reaction order	n = 4	12.18
Mixed minerals (1 : 1)	I	Third order	Chemical reaction, F3, deceleration type a-t curve	1.04
	II	Two-third order	Chemical reaction	4.55
	III	Avrami–Erofeev equation	Random nucleation and subsequent growth (n = 3)	105.79
	IV	Reaction order	n = 4	7.29
	V	Reaction order	n = 4	12.08
Pyrrhotite	I	Third order	Chemical reaction, F3, deceleration type a-t curve	1.04
	II	Two-third order	Chemical reaction	5.28
	III	Two-third order	Chemical reaction	4.26
	IV	Inverse Jander equation	Three-dimensional diffusion	109.68