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

Table 1

True density test results of coal samples with different sulfur contents before and after the increase of the oxidation temperature.

Oxidation temperature	Sulfur/sulfur content	0	2	3	4	5
Before	FeS2	1.39	1.44	1.46	1.48	1.52
	FeS	1.39	1.45	1.47	1.5	1.58
After	FeS2	1.64	1.65	1.67	1.68	1.73
	FeS	1.64	1.72	1.74	1.79	1.82