Technology and Application of Coal rejects Zero Discharging Treatment in Underground Mine Under Complicated Geological Conditions

In order to make a underground treatment of the coal rejects in the coal mine with complicated geological conditions,the paper had an analysis on the mine coal rejects sources,including the mine gateway driving rejects,coal flow rejects,seam partings,open-off cut rejects,fault rejects and others.The paper provided the coal rejects treatment methods,including the backfill of the gateway driving,the rejects storage in the chambers and the backfill of mining goaf.The coal rejects treatment method was applied to Zhaizhen Mine.The practices showed that the ZZ2600/13/20.5BC mode hydraulic powered backfill support could be applied to realize the coal rejects backfill in the goaf.After the coal rejects from the coal mining face had a primary gravity separation in the mining block and the secondary γ-ray separation,the coal rejects flow would be conveyed to the coal mining face and the coal rejects dumping belt conveyor was applied to backfill the coal rejects in the goaf.In the fault and other geological structure zone,the gateway pre-driving technology could be applied to convey the coal rejects to the goaf for backfill.Zhaizhen Mine could realize the coal rejects treatment of 1 million t annually in the underground mine.With the coal rejects treatment technology applied in the underground mine,the surface coal rejects dumping system was fully dismantled.