A method for backfilling gobs with separate mining and gangue in thick coal seams with mixed gangue

Abstract

A method for separately mining and transporting a thick coal seam with gangue and backfilling a goaf with gangue, the method comprising: tunneling a transportation roadway (1) and a track roadway (2) in parallel in the coal, and connecting the transportation roadway and the track roadway to form an open-off cut; employing comprehensive mechanical solid filling and coal mining technology for coal recovery and goaf backfilling during coal mining; mining the coal seam and the gangue seam in layers from top to bottom in sequence, transporting the coal down to the transportation roadway via a front scraping conveyer (10), and transporting the coal out of a working face via a belt conveyer (5) in the transportation roadway; during gangue seam mining, reversing the front scraping conveyer to transport the gangue to the track roadway, transporting the gangue to the goaf (14) via a reverse gangue loader (6) and a feeding scraper (7) in the track roadway, and backfilling the gangue to the goaf (14) via a backfill scraping conveyer (12). The method not only improves coal resource recovery rate and coal quality, but also initiates a new technical approach for large-scale mining of a thick coal seam with gangue in China, the approach being simple and easy to operate, having high recovery rate and extensive practicability.

Description

technical field [0001] The invention relates to a method for backfilling gobs by mining and gangue rocks in thick coal seams, and is especially suitable for comprehensive mechanized solid filling mining of coal seams with thick gangue seams. technical background [0002] There are a considerable number of mines in my country whose mineable coal seams contain gangue of different thicknesses. In the past, when production mines selected coal seams containing gangue mining plans, they basically depended on experience depending on the specific situation, which was inevitably blind. Some even caused a lot of waste of resources and economic losses. With the development of the economy and the progress of society, a consensus has been formed on the social responsibility of enterprises. In order to protect scarce resources, the state has issued a series of policies to urge enterprises to change the past "predatory" mining methods, forcing enterprises to increase resource recovery rate...

AI Technical Summary

Problems solved by technology

However, for fully mechanized caving mining, the recovery rate is not high and the coal and gangue are mixed, which reduces the quality of coal, increases the workload of washing and sorting gangue on the ground, and increases the cost.

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