Method for filling coal-steam-free extraction working surface goaf by coal mine waste rock

Abstract

The invention relates to a method for filling non-pillar mining face goaf by using gangue. A face (1) uses roof control of filling every four meters: directly transferring raw gangue to a gangue unloading lane (7) and then a gangue storehouse (9) , unloading to a scrapter conveyer (16) through a hopper gate (15), and transferring the gangue to goaf through a gangue transferring belt (4), a face scrapter conveyer (11) , and a high speed gangue throwing belt (12). According to the invention, raw gangue is directly filled into the non-pillar mining face goaf without being smached or processed, the handling capacity is large; the filling area is large, the space is large, so that gangue does not lift, and the gangue dump can be backfilled, thus finally realizing zero stacking of gangue to improve coal mine environment. The invention supplies a novel coal mining method for realizing environment protecting exploitation and liberating 'three unders' unexploited coal.

Description

[0001] Application field [0002] The present invention relates to a method for filling the goaf of the mining face in the field of coal mining, in particular to mining without coal pillars in the coal mining face, the gangue of the mine is impacted at high speed, squeezed and fastened, the gob is enriched, and the deformation of the ground surface is reduced. gangue filling mining method in coal mining face. Background technique [0003] At present, the total accumulation of gangue in my country exceeds 2.5 billion tons, and it is increasing at a rate of 130 million tons per year. A large amount of coal gangue is stored in the open air for a long time, and the sulfide contained in the gangue will pollute the air and water sources after being emitted. The pyrite contained in the gangue is easily oxidized by the air, and the heat released can promote the weathering of the coal contained in the gangue to make it natural .The gas emitted when the gangue is burned seriously pollu...

AI Technical Summary

Problems solved by technology

However, due to the small filling capacity of the roadway, it is impossible to completely solve the problem of gangue not being lifted into the well; the method of filling gangue in the gob area of ​​the mining face is not solid, and cannot form effective support for the roof and solve the problem of surface deformation.

At the same time, this method leaves a coal pillar filling process to reduce the coal recovery rate, which is only 75%, resulting in a waste of resources

The construction process of this method is complicated, and the supporting materials such as columns and beams used in the process cycle are frequently transported, and the labor intensity of the workers is high.

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