Catalytic action of minerals in the low temperature oxidation of coal
The mild oxidation of coal by air in a fluidized-bed reactor has been studied by utilizing X-ray powder diffraction, scanning electron microscopy accompanied by energy dispersive X-ray analysis and Mössbauer spectroscopy. These techniques show that some of the highly dispersed minerals in coals unde...
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Veröffentlicht in: | Fuel (Guildford) 1984-01, Vol.63 (5), p.673-678 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The mild oxidation of coal by air in a fluidized-bed reactor has been studied by utilizing X-ray powder diffraction, scanning electron microscopy accompanied by energy dispersive X-ray analysis and Mössbauer spectroscopy. These techniques show that some of the highly dispersed minerals in coals undergo changes concurrently with the reactions of the coal matter. An oxidation treatment at a reactor temperature of 350 °C transforms most of the pyrite (FeS
2) into hematite (Fe
2O
3) andthecalcite (CaCO
3) into anhydrite (CaSO
4). Pronounced pitting of the coal surface was observed in the vicinity of mineral crystallites and particles. Calcium was present as a dominant element in those minerals that caused the oxidative pitting to occur most rapidly. |
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ISSN: | 0016-2361 1873-7153 |
DOI: | 10.1016/0016-2361(84)90165-0 |