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Abstract In view of the 202 fully-mechanized working face of Fangshan Dianping Mine, CO concentration exceeding limit in 300 ~ 400 m working face, the working face CO concentration increased, and during the period of recovery, the "nitrogen injection, injection of fly ash and magnesium chloride injection resistance agent" comprehensive fire prevention measures were taken, such as practice showed that, with comprehensive measures, the CO overrunning phenomenon was reduced, CO concentration decreased to 0.0017% from 0.0094%, ensured the safe and efficient mining face, with remarkable application results.
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