Minerals | Free FullText | Study on a HighEfficiency Mining ... MDPI
In the "Code of Practice for Coal Mine Gas Extraction" (AQ) and the "Basic Indicators for Coal Mine Gas Extraction" (AQ) as well as other relevant codes, it is clearly stipulated that the gas concentration range must be controlled within 8 m 3 /t or that the coal seam gas pressure must be reduced to MPa (gauge ...