Abstract
Experiments leading to the DTA oxidative thermal curves for pyrite, marcasite, and several low temperature ash (LTA) specimens of coals were performed. The coal seams represented by the LTA specimens were the Herrin 6 seam (southwestern Illinois), Hazard 7 seam (eastern Kentucky) and the Hazard 8 seam (eastern Kentucky). Synthetic mixtures containing pyrite, ferrous sulfate monohydrate, and alumina were also studied to determine the effect of iron(II) sulfates on the DTA oxidative profiles. The effects of sample size and sample distribution in the DTA sample cup of natural pyrite and marcasite specimens on the observed thermal curve were also studied. Similarly, the variation of the oxidative thermal curves with pyrite level in the LTA specimens was observed. Distinguishing features of the thermal curves for the LTA specimens obtained in dynamic air purge are also identified and discussed.
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