| Citation: |
YANG Ke，HE Shuxin，HE Xiang，et al. Foundation and technology of coordinated utilization of bulk solid waste ‘Three modernizations’ in coal power base[J]. Coal Science and Technology，2024，52（4）：69−82. DOI: 10.12438/cst.2024-0129
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The construction of 14 large-scale coal bases and 89 demonstration bases for the comprehensive utilization of bulk solid waste in China marks that the utilization of bulk solid waste in mining areas has been incorporated into the national strategic development layout. The long-term high-intensity development and utilization of coal resources has caused the near depletion of shallow-buried coal seam resources in mining areas, and the large-scale solid waste accumulation and surface subsidence of coal power and chemical bases has become a problem restricting the green, low-carbon and high-quality development of mining areas. Co-operative utilization of bulk coal-based solid waste and green filling is an effective way to liberate the “three down and one up” pressed coal, extend the service life of mines, and realize the harmless, resourceful, and large-scale “three” utilization of solid waste. Based on the types and production of coal-based solid waste in Shanxi Province, the “East China Energy Granary” Anhui Lianghuai Base and Ningdong Energy and Chemical Base, it elaborates in detail the harmless disposal of coal-based solid waste through heavy metal adsorption and desorption and complexation passivation technology with coal gangue, fly ash, furnace slag, gasification slag and desulphurization gypsum as the main materials, listing the classification and application of coal-based solid waste, and the application of coal gangue, fly ash, furnace slag, gasification slag and desulphurization gypsum as the main materials. List the ways of resource utilization of coal-based solid waste classified and applied to low calorific value coal-based solid waste for power generation, preparation of building materials such as cement, bricks and tiles, etc. Comparatively analyze the ways of reclamation and backfilling of coal mining subsidence area and downhole filling and large-scale utilization of coal-based solid waste, highlighting the superiority of downhole filling of coal-based solid waste. Based on the deep coal resources of coal electrification bases, the theory and key technologies of green filling mining are proposed, including the synergistic technology of deep coal gangue source reduction and mining and filling, the technology of efficient preparation and deep underground transportation of filling materials, and the deep multi-field coupling mechanism of coal-based solid waste filling materials, and the technological principles and methods of the whole process of deep filling mining of multi-source coal-based solid waste from the source, process to the end are investigated to solve the technical problems of deep underground filling of mining areas. The technical problems of filling are solved. According to the geological conditions and filling purposes of Renjiazhuang Coal Mine in Ningdong Base, Huoerxinhe Coal Mine in Shanxi Province and Huaibei Mining Area, the key technologies of low-level filling by overdrilling, multi-separation layer stepped grouting under the conditions of atypical characteristics of key layers and synergistic utilization of coal-based solid wastes have been proposed, which comprehensively combine the advantages of disposal and utilization of solid wastes from mines, development and utilization of deep coal resources, control of subsidence of the ground surface, and ecological environment protection, and form a comprehensive plan for the disposal and utilization of bulk solid wastes from coal power and chemical bases. Coal power and chemical base bulk solid waste synergistic utilization and green mining mode, providing reference for high quality coal mining and low damage to the environment.
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