groups during the secondary oxidation of coal. After pre-oxidation, the activation energy of coal was lower than that of raw coal; it was the lowest when the pre-oxidation temperature was 120 °C. In summary, the risk of spontaneous combustion of pre-oxidized coal increases during secondary oxidation, and the risk is greatest when the pre-oxidation temperature climbs to 120 °C.
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Ma et al. (2019) studied this question.
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