Application of Temperature Programmed Oxidation-Infrared Technique in the Analysis of Sulfur Occurrence and Genesis in Phosphate Rock

Table 1

Physical properties of sulfur species with known structures used in this work.

Number	Samples	Properties
		Molecular weight	Melting point (°C)	Purity (%)
1	Cu2S	159.16	1100–1130	99.000
2	MnS	87.00	1610	98.000
3	FeS	87.91	1195	99.000
4	WS2	247.97	1489	99.900
5	CoS	97.00	1116	99.500
6	ZnS	97.46	1700	99.999
7	Ag2S	247.80	825	99.995
8	CrK(SO4)·12H2O	403.00	89	—
9	NiSO4·6H2O	262.96	31.5	—
10	(NH4)2S2O8	228.20	120	≥98
11	Na2SO3	126.04	150	≥97
12	H2N·NH2·H2SO4	130.12	254	≥99
13	(NH4)2SO4	132.14	235–280	≥99
14	MnSO4	169.02	700	99.000
15	MgSO4·7H2O	246.47	1124	99.000
16	FeSO4·7H2O	278.02	64	99–101
17	CaSO4·2H2O	172.17	1450	≥99
18	C18H29NaO3S	348.48	>300	—