Long-wall integrated-extraction reclaiming room-type coal column mining method

Abstract

The invention provides a long-wall comprehensive mining recovery room type coal-pillar mining method. An air stopping curtain is hung between a first row of coal-pillars of a comprehensive mining working face and the coal-pillars at both sides of an air intake tunnel and an air return tunnel to form a ventilation system for the long-wall comprehensive mining; the comprehensive mining equipment is arranged at the comprehensive mining working face; the top plates of the air intake tunnel and the air return tunnel are pilot-supported with a single post or wooden chock within a scope of 30 m in front of the comprehensive mining working face; a row of hydraulic supports which have high support resistance hydraulic pressure are arranged in the coal room 5 m ahead along the mining direction of the comprehensive mining working face, then the first row of coal-pillars is extracted; an air-stopping curtain is hung between the coal-pillars of the next row of comprehensive mining working faces during the coal extraction of the coal-pillars to guarantee that a ventilation system is formed when the next row of coal-pillar is extracted; the hydraulic supports which have high supporting resistance move with the move of the hydraulic supports of the comprehensive working surface and always keep a distance of 5 m with the hydraulic supports for the comprehensive mining working face, and thus, the coal-pillars can be constantly extracted. The method can extract at least 85 percent of the permanent coal-pillars left by the room-type mining method; the method is simple and has wide applicability.

Description

technical field [0001] The invention relates to a method for recovering a room-type mining coal pillar in a coal mine, in particular to a method for recovering a room-type mining coal pillar by long-wall fully mechanized mining. Background technique [0002] Leaving coal pillars after room mining has become a major problem faced by coal mines in western my country. The room type coal mining method makes a large amount of coal left in the underground in the form of residual coal pillars, and the coal recovery rate is only about 30%, resulting in a serious waste of coal resources. With the increasing shortage of energy resources, how to recover the coal pillars left by room mining has become a very urgent task. If this situation is not effectively resolved, it will not only result in a great waste of resources and greatly shorten the service life of mines, but also bring a series of social problems such as employment and stability to the country. [0003] At present, the way...

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Problems solved by technology

However, the above-mentioned practices and attempts have a relatively low degree of mechanization, poor production efficiency, small scale or some are in the research stage

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