Method for reclaiming collapsed land of mines

Abstract

The invention relates to a method for reclaiming collapsed land of mines. Coal gangue, building wastes, living wastes, excess sludge and clay are used as filling material and are directly filled into a collapsed basin, and are mixed with water to generate organic filling soil, the excess sludge and the stored water are formed into an oxidizing pond to treat production wastewater, living sewage and wastes, so the problem of the reclaimed land lacking of organic soil suitable for plant growing is solved; the problem of land occupation for the storage of the coal gangue and the filling of the wastes and the excess sludge is solved; the excess sludge directly flows from a sludge concentrated tank of a sewage treatment plant, so the subsequent treatment procedure of the sludge is omitted, and the running cost of the sewage treatment plant is reduced; and meanwhile, the standard emission of the treated sewage is realized, or the requirement of the water quality of the reclaimed water which is reclaimed for the production and living of the coal mines is met. The method has the advantages that the operation is convenient, the investment is little, and the reclaiming cost is low. The method is especially suitable for reclaiming the collapsed land with large area in the large mines.

Description

technical field [0001] The invention relates to the technical field of land reclamation, in particular to a reclamation method for mine subsidence. Background technique [0002] Coal mines and other mines cause surface subsidence during the mining process, forming large-scale subsidence basins. Most of these subsidence basins are filled with water, which prevents crops from growing and occupies a large amount of arable land. In order to restore and utilize these destroyed lands, a large amount of investment is often required. Human, material and financial resources; on the other hand, mining enterprises such as coal mines produce a large amount of coal gangue and other wastes in the production process, and stacking these coal gangues requires a certain amount of land. [0003] At present, there are various forms of treatment and utilization of coal gangue in mining areas and subsidence areas in China, such as using coal gangue as building materials, fuels, and chemical raw m...

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Problems solved by technology

[0003] At present, there are various forms of treatment and utilization of coal gangue in mining areas and subsidence areas in China, such as using coal gangue as building materials, fuels, and chemical raw materials, using subsidence areas for aquaculture, and building parks. There are also many places where coal Wastes such as gangue are directly filled into the subsidence basin. The upper part of the gangue is covered with soil and then planted. However, the water retention of the gangue in the lower part of the soil is very poor, resulting in water shortage in the upper soil layer, making it difficult for trees or crops to survive. At the same time, in order to ensure production For safe operation, coal mines need to discharge a large amount of underground water. The underground water comes from coal mining face, tunneling head and old mined-out area. It contains a large amount of coal dust, rock particles and a certain amount of bacteria. Untreated discharge will cause surface pollution. water pollution

[0004] Application number: 201110201641.x discloses a kind of artificial soil and its production method, and application number: 200810197214.7 discloses a kind of topsoil used for mining reclamation, but this artificial soil has high production cost and complicated operation, which is difficult for large mines to produce. Land reclamation of subsidence basins is not applicable

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