Based on the changes in radical parameters at different oxidation stages, the radicals in coal are divided into transient radicals and persistent radicals according to their survival times. At the cooling stage, the radical concentration first decreases and then stabilizes at a relatively high level, and both the g factor and the linewidth nearly return to the initial values. At the maintaining stage (230 ☌), the radical concentration keeps increasing, while the g factor and the linewidth remain stable. At the heating stage, the radical concentration first rises slowly and then surges the g factor remains small initially and increases rapidly later the linewidth falls continuously. To this end, an in situ electron spin resonance (ESR) spectrometer was adopted to measure changes in radical parameters at the heating, maintaining and cooling stages in real time. This study aimed to explore the changes in radical parameters and the reactivity and persistence of newly produced radicals of coal at different temperature stages. Residual coal in mine goafs will be oxidized in the presence of air leakage, which can be well tracked through the radical reaction.
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