Study on the Effect of Polysulfide Content on the Micromorphology and Spontaneous Combustion Characteristics of Coal

Table 3

Infrared absorption peak area values of the main functional groups in each coal sample at 30°C.

Name of added sulfide	Sulfur content (%)	Aliphatic hydrocarbon-CH3/-CH2-/-CH	Aromatic hydrocarbon C=C	Oxygen-containing functional group
				-OH	C=O	C-O
Nothing	0	10.161	5.592	15.531	4.762	7.418
FeS	2	12.452	2.409	17.108	4.762	7.581
	3	18.576	10.369	26.345	3.355	13.191
	4	20.850	12.553	41.493	4.762	14.316
	5	12.308	6.324	19.467	1.497	6.945
FeS2	2	13.432	7.579	21.908	2.244	7.780
	3	11.894	7.410	18.865	2.464	9.979
	4	12.999	9.518	20.578	3.412	12.897
	5	14.630	7.577	23.372	2.948	10.033