1Study on properties of semi-coke from lignite pyrolysisMA Ke-fu, LIU Wen-li1-42Coal products quality control in Huainan mining groupCUI Song-tao, LU Qi-jun5-83Coal quality characteristics and utilizing directions of main coal seam in Aydin lake slope of Turpan-Hami BasinWU Zheng-qian, CAO Lei9-144Triassic coal seam in west mine field of Baiyanzi and its coal quality characteristicsMA Jin-liang, ZHANG Yuan-ji15-185Evaluation analysis and inspection countermeasures of coal quality for imported North Korea anthraciteJI Qi-yong, ZHAO Jun, FENG Li-bing, HU Shou-peng19-206Influencing factors of mixed coal quality and the corresponding controlling countermeasure analysis for Changcun coal mineLI Yu-yun, WANG Ze-nan21-23,267Discussion on improving the quality management of coal laboratoryWU Ji-hong24-268Research on direct determination of the contents of elements in fly ash using X ray fluorescence spectrometryWU Suo-zhen, LIU Di, WU Yu-Xia, LI Jun, CHENG Jian-lin27-319Discussion on influencing factors on determination of coal ashZHANG Zhen, WEI Ning, LI Kan-she, YANG Zai-wen32-3510Research on carboxy reactivity using chromatography of gases methodWANG Wen-chao, ZHENG Xue36-37,4111Research on how the crucible affected the test results of volatile matterZHANG Xiao-xia, YANG Hai-sheng38-4112Discussion on the determination of moisture content of coalWANG Mei-bao42-44,4713Feasibility analysis for a power off protection device of mechanical energy storage hammer primary sampling takerYAO Yuan-shu, LI Wei, SANG Bai-yang45-4714Circuit design and software implementation of automatically strata gelatinosum indices analyzerYING Feng-guo, LIU Hui48-4915Drawing of coal slime floatability curves based on sequence evaluation experimental resultLI Yun-hong50-5216Discussion on Choice of Different operation statuses of Clean coal sedimentation centrifugeDONG Chen-gang53-55,6817Feasibility study of flotation technology of cyclone group overflowLI Xiao-ying56-5718Digital technology application in the process of configuration quality control in coal preparation plantYANG Hong-qing58-60,6319Fault diagnosis and planned maintenance about electromechanical equipment of coal preparation plantLI Wen61-6320Research on the calculation method of carbon emissions of coal industry and low carbon operation modeLI Feng-shan, ZHU Chuan, CAO Lei, WU Lin-lin, MA Gan64-68 