Underground coal separation method and system

Abstract

The invention discloses an underground coal separation method and a system. According to the method, a coal preparation plant is integrally built under the ground, a plurality of coal products are conveyed to a product storehouse on the ground through a lifting system or a belt conveyor after washing, and washed gangue is directly used for filling goaf under the ground. According to the coal separation process, a torbanite dense-medium shallow slot is used for separation, slack coal is not washed, coarse slime is recycled by adopting a thickening and classifying cyclone and a high-frequency screen, and fine slime is recycled by adopting a filter press. According to the underground coal separation method, the coal preparation plant is built under the ground, so that the occupied area of an industrial site on the ground is greatly reduced. In addition, the washed gangue is not discharged from a mine, so that the invalid lifting and the transportation cost are reduced, the actual capacity of the mine is increased, additionally, the gangue stacking and processing cost on the ground is reduced, and environmental hazards are reduced. According to the underground coal separation method, the washing process of most coal preparation plants can be satisfied, the application range is wide, and for the construction of coal mines in mountain ravines, limited areas or land difficult to remove, the problem of difficulty in plant location is solved.

Description

technical field [0001] The invention belongs to the technical field of coal separation and relates to coal preparation production, in particular to an underground coal preparation plant production method and system. Background technique [0002] Traditional coal mine design In coal mining operations, the raw coal is generally only coarsely broken underground and then transported by a hoisting system or a belt conveyor to the ground before washing. Coal preparation plants in industrial sites generally need to build raw coal bunkers, screening and crushing workshops, main workshops, filter press workshops, product warehouses, thickening tanks, pump rooms and related auxiliary facilities. Coal preparation plants cover an area of ​​tens of hectares, and coal mine construction sites are mostly remote villages or mountain ravines. For remote villages, land acquisition and demolition are difficult and expensive. For mountain ravines, industrial sites are narrow, and the cost of mou...

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Problems solved by technology

[0005] At present, there are some examples of the application of underground gangue removal technology in China, most of which are pre-drainage operations of raw coal. The jigging technology was applied in the Xingdong Coal Mine of Jinzhong Energy, and the shallow groove was applied in the Jiyang Mine of Xinwen Mining Group. Dense medium gangue removal process, but so far there is no implementation case where the entire production system of a coal preparation plant is built underground

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