Characteristics and coal facies of high quality anthracite from coal seam No.5 of Xiaofalu coal mine,Yunnan province

:ThecharacteristicsandgeologicaloriginofhighqualityanthracitefromcoalseamNo.5ofXiaofalu,Yunnanprovince,Chinawerestudiedbasedonthetheoriesandmethodsofcoalpetrology,coal chemistryetc.TheresultsshowedthatcoalseamNo.5wascharacterizedbyextremelylowashyieldof rawcoal(Ad:thelowestvalue1.49%).ComparedwithothertypicalanthracitesinChina,coalseam No.5hadhigherhydrogencontent(Hdaf:thehighestwere3.22% ~3.37%)andthehighestfreehydrogencontent(2.95% ~3.12%),aswellasthelowestoxygencontent(1.44% ~2.27%).Bright coalswerethemainlithotype(79.8%).Subgroupswithcellstructurewerethemainmaceralcompositioninbothvitriniteandinertinite.TheTPIandGIvaluesofcoalseamNo.5were0.97~1.44and 4.22~5.78(>4.00),respectively.