Coal gangue processing method and coal gangue foamed concrete and roadway backfilling method

Abstract

The invention discloses a method for processing coal gangue, a coal gangue foamed concrete produced by the method and a method for backfilling a mine roadway with the foamed concrete. First, crush the gangue into powder or granules; then mix the gangue powder or granules, cement, and water to form a gangue concrete slurry; then mix the gangue concrete slurry with foam to form a coal gangue foamed concrete slurry; Finally, the coal gangue foamed concrete slurry is transported into the roadway to be backfilled, and the coal gangue foamed concrete filling body is formed in the roadway after the slurry is solidified. Backfill the roadway with coal gangue foamed concrete, reduce the accumulation and discharge of coal gangue, realize the nearby materials for backfilling the roadway, and realize the dense filling of the roadway without blind areas without mechanical compaction, and improve the safety of the mining area. The gangue foamed concrete of the present invention can also be used for filling roadbeds, pipe foundations, bridge foundations and high fill.

Description

technical field [0001] The present invention relates to a method for processing and recycling coal gangue and the products produced by the method and its application. Specifically, the present invention relates to a method for producing foamed concrete by using coal gangue and the foamed concrete produced by the method And the application of the foamed concrete in the backfilling of mine roadway. Background technique [0002] In order to mine coal, it is necessary to excavate roadways that are not directly connected to the ground in the rock mass or seam. After the coal is mined, these roadways become goafs; when mining underground, it is also necessary for mining lifting, transportation, ventilation, drainage, power supply, etc. Driving roadways; these roadways are horizontal, vertical and inclined, and come in a variety of shapes. When the coal in a certain area has been mined, in order to ensure the safety of the mine, the formed roadway (including the goaf) must be back...

AI Technical Summary

Problems solved by technology

The direct method is to directly fill the coal gangue in the mine roadway; because the coal gangue is in the form of a block, and the compaction operation cannot be performed when the roadway is backfilled, the filled roadway is not compacted, and the blocky coal gangue is difficult to enter the roadway In some narrow areas, resulting in insufficient filling, there are still great safety hazards

The pulverization method is to crush the coal gangue and fill it in the roadway. Since the compaction operation cannot be carried out, and the coal gangue powder filled in the roadway cannot be bonded together, the filled roadway is not compacted, and the coal gangue powder in the roadway is not compacted. The filling body is in the shape of loose sand, which is prone to settlement and loss, and cannot completely fill the roadway, which seriously affects the filling strength and poses a great safety hazard