Oxidation of some bulgarian coals. Influence of low-temperature oxidation on the microhardness and reflectivity of some brown coals |
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| Authors: | Kalinka Markova Sevdalina Valceva |
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| Affiliation: | Research Laboratory for Coal Petrology, KI. Ochridski University, Bul. Russki 15, 1000 Sofia, Bulgaria |
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| Abstract: | Experiments carried out with two clarain and three vitrain samples from the Bobovdol basin and two clarain samples from the Pirin basin have shown that changes in microhardness and random reflectance are useful indications of changes which occur in the coal substance during oxidation processes at 150 and 200 °C and subsequent extraction. |
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| Keywords: | brown coals oxidation microhardness reflectance |
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