Research Article
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 | — |
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