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CN-118080522-B - Method for accelerating soil formation of concrete solid waste

CN118080522BCN 118080522 BCN118080522 BCN 118080522BCN-118080522-B

Abstract

The invention discloses a method for accelerating the formation of concrete solid waste, belonging to the technical field of solid waste treatment and resource utilization. The method is realized by the following steps of (1) crushing and screening concrete solid waste, (2) adding salt solution into crushed concrete fragments for soaking/draining circulation, (3) carrying out secondary crushing and screening on the concrete solid waste subjected to salt corrosion and weathering, recovering oversize materials, (4) adding silicate bacteria into undersize materials, and (5) adding fungi and green manure plants. The method reduces the structural strength of concrete solid waste by corrosion of salt, accelerates the efflorescence and pulverization of the concrete solid waste, separates and recovers the efflorescence-resistant sand and stone materials by secondary crushing and screening of the efflorescence-resistant product of the concrete solid waste, can accelerate the efflorescence stabilization of minerals by adding silicate bacteria into the screen lower material, and can improve the ventilation, soil moisture conservation and fertilizer storage performance of the weathered product of the concrete by adding fungi and green manure plants.

Inventors

  • HU XUEWEI
  • CHEN SONGYANG
  • TIAN SENLIN
  • ZHAO QUN
  • SONG HAORAN
  • LI JIE
  • CUI XIANGFEN
  • HUANG JIANHONG
  • LI CHEN

Assignees

  • 昆明理工大学

Dates

Publication Date
20260508
Application Date
20240326

Claims (7)

  1. 1. A method for accelerating the formation of concrete solid waste is characterized by comprising the following steps: (1) Crushing and screening the concrete solid waste; (2) Adding a salt solution into the crushed concrete fragments, and carrying out alternate circulation of soaking and draining; (3) Performing secondary crushing and screening on the solid waste of the concrete subjected to salt corrosion and weathering, and recycling the oversize materials; (4) Silicate bacteria are added into the undersize; (5) And adding fungi and green manure plants to accelerate the formation of soil from concrete solid waste, wherein after silicate minerals are weathered and stabilized, the fungi and green manure plants are added, and the fungi are one or a combination of aspergillus niger (Aspergillus niger), ectomycorrhizal fungi (Ectomycorrhizal fungi), aspergillus fumigatus (Aspergillus fumigatus), mucor minor (Penicillium spinulosum) and Talaromyces sp.
  2. 2. The method for accelerating the formation of concrete solid waste according to claim 1, wherein the particle size of the concrete solid waste obtained by crushing and screening in the step (1) is 40-150 mm.
  3. 3. The method for accelerating the formation of concrete solid waste according to claim 1, wherein the salt solution added in the step (2) is one or a combination of a plurality of sulfate, chloride and nitrate.
  4. 4. The method for accelerating the formation of concrete solid waste is characterized in that the mass concentration of anions of the salt solution added in the step (2) is 0.1% -20%.
  5. 5. The method for accelerating the formation of concrete solid waste according to claim 1, wherein the soaking/draining cycle time in the step (2) is 1-80 times, the soaking time is 1-24 hours each time, and the draining time is 1-24 hours each time.
  6. 6. The method for accelerating the formation of concrete solid wastes according to claim 1, wherein the particle size of the recovered oversize products after secondary crushing and screening in the step (3) is 10-40 mm.
  7. 7. The method for accelerating the formation of soil from solid wastes of concrete according to claim 1, wherein the silicate bacteria added to the undersize in the step (4) are one or more combinations of bacillus mucilaginosus (Bacillus mucilaginosus Krassilnikov), bacillus circulans (Bacillus circulans), bacillus polymyxa (Paenibacillus polymyxa), bacillus terreus (Bacilluse edaphicus) and space-borne bacteria (Cenococcum geophilum).

Description

Method for accelerating soil formation of concrete solid waste Technical Field The invention belongs to the technical field of solid waste treatment and resource utilization, and particularly relates to a method for accelerating the soil formation of concrete solid waste. Background The construction waste is a general term for waste generated in the process of building, changing (expanding) building, dismantling various building (construction) structures, pipe networks, roads and bridges and the like and decorating houses. The concrete solid waste is the main solid waste generated after the service life of the concrete is prolonged and the concrete is removed, and accounts for 60% -70% of the total amount of the building solid waste. It is estimated that about 6×10 8 t concrete solid waste is produced annually in our country. At present, the treatment and disposal modes of concrete solid wastes are utilized on site, intensively disposed, piled up and buried, and the recycled products are produced. The recycling of concrete solid wastes is mostly realized by recycling the concrete solid wastes in the form of recycled aggregate. In the engineering, the method of on-site or centralized disposal is mostly adopted, the generated concrete solid waste is utilized to produce the recycled aggregate, and the recycled aggregate is applied to various building engineering. The recycling rate is low, so that the environmental benefit is poor. And the waste concrete is piled up and buried, and the land is occupied in the process of piling up and burying the waste concrete, so that the ecological environment is destroyed, and resources such as public and minute stones in the solid waste of the building are wasted. Therefore, development of a new technology for recycling concrete solid wastes is needed, the recycling utilization rate of the concrete solid wastes is improved, the damage to the ecological environment is reduced, and technical support is provided for large-scale absorption and recycling of large quantities of solid wastes. At present, the formation of large amounts of solid waste soil has become a research trend. In concrete solid waste, there are structural frames composed of sandstone materials such as metric stone and the like, and mineral aggregates composed of silicate minerals. The invention provides a new technology for recycling concrete solid waste based on the theory of mineral weathering soil and corrosion. Disclosure of Invention Aiming at the demands of resource utilization and ecological protection of concrete solid waste, the invention provides a method for accelerating the formation of concrete solid waste. The method comprises the following steps of reducing the structural strength of concrete solid waste through corrosion of salt, accelerating efflorescence and pulverization of the concrete solid waste, separating and recycling weatherproof sand and stones through secondary crushing and screening of the weathered products of the concrete solid waste, accelerating mineral efflorescence and stabilization of the sand and stones through adding silicate bacteria into the screened matters, and improving the ventilation, soil moisture conservation and fertilizer storage performance of the weathered products of the concrete through adding fungi and green manure plants. The invention is realized by the following technical scheme: (1) Crushing and screening the concrete solid waste; (2) Adding sulfate solution into the crushed concrete fragments, and carrying out alternate circulation of soaking and draining; (3) Performing secondary crushing and screening on the solid waste of the concrete subjected to salt corrosion and weathering, and recycling the oversize materials; (4) Silicate bacteria are added into the undersize; (5) And then adding fungi and green manure plants to accelerate the solid waste of the concrete to form soil. Preferably, in the step (1), the particle size of the concrete solid waste after crushing and screening is 40-150 mm. Preferably, in the step (2), the salt solution is one or a combination of more than one of sulfate, chloride and nitrate. Preferably, in the step (2), the mass concentration of anions in the salt solution is 0.1% -20%. Preferably, in the step (2), the soaking/draining cycle times are 1-80, the soaking time is 1-24 hours each time, and the draining time is 1-24 hours each time. Preferably, in the step (3), the particle size of the oversize product is 10-40 mm. Preferably, in step (4), the silicate bacteria are one or more combinations of bacillus mucilaginosus (Bacillus mucilaginosus Krassilnikov), bacillus circulans (Bacillus circulans), bacillus polymyxa (Paenibacillus polymyxa), bacillus terrestris (Bacilluse edaphicus) and space-borne bacteria (Cenococcum geophilum). Preferably, in step (5), the fungus is of the type one or more of Aspergillus niger, ectomycorrhizal fungus (Ectomycorrhizal fungi), aspergillus fumigatus (Aspergillus fumigatus), penicillium sp