A coal-rock sorting and utilizing method for a coal-rock co-mining working surface

Abstract

A coal-rock sorting and utilizing method for a coal-rock co-mining working surface is provided and particularly suitable for sorting and utilization of coal and rock which are mined through a coal-rock co-mining working surface when an extremely thin coal seam is adopted as a protective layer during multiple-seam combined mining. The method includes directly building an underpit gangue transferring, storing and filling system in a pit, conveying a large amount of coal gangue mined though the coal-rock working surface to an underpit sorting and washing chamber to perform efficient coal gangue separation, crushing the sorted gangue, and filling a worked out section of the protective layer with the crushed gangue, thus achieving green filling and mining of the protective layer at the same time of no gangue lifting, and effectively preventing ground surface settlement caused by multiple-seam combined mining. Sorted middlings are conveyed through a main conveying system to a ground gangue power plant to generate electricity, thus relieving pressure on mine coal quality at the same time of generating benefits to the power plant, decreasing the average ash content of commercial coal and raising the selling price. The method achieves efficient separation of coal from the gangue, achieves efficient utilization of the coal and rock, and has significant economic and social benefit and good popularization value.

Description

technical field [0001] The invention relates to a method for sorting and utilizing coal and rocks in a coal and rock simultaneous mining face, and is especially suitable for the separation and utilization of coal and rocks mined from the coal and rock simultaneous mining face when an extremely thin coal seam is used as a protective layer in multi-coal seam joint mining. Background technique [0002] For coal seam groups, the most effective method of pressure relief and gas drainage is the preferred mining protection layer, which is also the preferred method of pressure relief and drainage of coal seams in the "Regulations on the Prevention and Control of Coal and Gas Outburst". However, for many coal seam groups, due to the large distance between coal seams or the uneven distribution of coal seam thickness and serious polarization, they do not have good protection layer mining conditions, so some extremely thin coal seams with a thickness of less than 1.3m have to be mined as...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a coal and rock simultaneous mining operation with simple method, low cost, and effective solution to problems such as gangue lifting and ground accumulation, coal quality reduction and surface subsidence caused by multi-coal seam joint mining and ultra-thin protective layer mining. Surface coal and rock separation and utilization methods; through the establishment of a separation and washing system in the mine, the scientific separation of coal and rock can be realized, and the green and efficient utilization of coal and rock can be realized respectively through the corresponding transportation system of the mine