Research on the Application of Underground Gangue Separation and Solid Backfill Technology in Coal Mining
China is the largest coal producer in the world,and the amount of coal gangue discharge ranks the first in the world.At the same time,large-scale coal mining has led to serious environmental pollution problems,such as surface subsidence and gangue accumulation,which put coal mining enterprises under enormous pressure to reduce emissions.The research progress of solid backfill mining technology is summarized,the realistic needs and significance of implementing underground waste coal separation are described,the technical principles,systems and key equipment of common underground waste coal separation methods such as selective crushing method,dense media shallow tank method,vibration-assisted sorting method,full-size water separation method and ray identification method are highlighted,and the coal mining-sorting-backfill+X scheme is proposed.Combining with the specific engineering case of 12#coal seam in Wuyang coal mine,the overall idea,system arrangement,selection area equipment and practical engineering application effect of"mining-sorting-backfill+gas extraction"technology are introduced.The results show that the combination of underground waste coal separation and solid backfill technology can achieve coal gangue emission reduction,underground washing and surface subsidence control,which is an effective way to realize green mining.
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