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CN-122010472-A - Water permeable brick based on household garbage incinerator slag and preparation method thereof

CN122010472ACN 122010472 ACN122010472 ACN 122010472ACN-122010472-A

Abstract

The invention relates to the technical field of water permeable bricks, in particular to a water permeable brick based on household garbage incineration slag and a preparation method thereof, wherein the water permeable brick comprises, by mass, 60-70 parts of household garbage incineration slag, 15-20 parts of cement, 0.1-0.5 part of basalt fiber, 1-3 parts of modified biochar, 2-4 parts of sodium bentonite, 1-2 parts of an additive, 0.5-2 parts of a toughening agent, 0.05-0.5 part of a silane coupling agent and 2-6 parts of water. According to the water permeable brick based on the household garbage incineration slag and the preparation method thereof, the solid waste of the household garbage incineration is absorbed through the high-proportion use of the household garbage incineration slag, and meanwhile, the problems of environmental protection pain points caused by leaching of heavy metals in the slag and the mechanical properties of the water permeable brick are solved through the synergistic effect of the modified biochar, sodium bentonite and cement.

Inventors

  • ZENG HUAIYU
  • ZHAO MENG
  • TANG XIAOFEI

Assignees

  • 桂林市环境卫生管理处

Dates

Publication Date
20260512
Application Date
20260226

Claims (10)

  1. 1. The permeable brick based on the household garbage incinerator slag is characterized by comprising, by mass, 60-70 parts of household garbage incinerator slag, 15-20 parts of cement, 0.1-0.5 part of basalt fiber, 1-3 parts of modified biochar, 2-4 parts of sodium bentonite, 1-2 parts of additive, 0.5-2 parts of toughening agent, 0.05-0.5 part of silane coupling agent and 2-6 parts of water.
  2. 2. The permeable brick based on household garbage incineration slag according to claim 1, wherein the household garbage incineration slag comprises household garbage incineration slag fine particles with the particle size of 0.1-2mm and household garbage incineration slag coarse particles with the particle size of 3-15mm, and the mass ratio of the household garbage incineration slag fine particles to the household garbage incineration slag coarse particles is 3-4:6-7.
  3. 3. The permeable brick based on household garbage incinerator slag, as set forth in claim 1, characterized in that the modified biochar is a nano metal-loaded biochar, and the nano metal comprises one or more of nano metal manganese, nano metal iron, nano metal magnesium and nano metal aluminum.
  4. 4. The water permeable brick based on household garbage incinerator slag, as set forth in claim 1, wherein the additive comprises one or more of an air entraining agent, a water reducing agent, an early strength agent, an antibacterial agent, a waterproofing agent and a retarder.
  5. 5. The water permeable brick based on household garbage incinerator slag, as set forth in claim 1, wherein the toughening agent comprises one or more of polyurethane emulsion, epoxy resin emulsion and polycarboxylic acid toughening auxiliary agent.
  6. 6. A method for preparing a permeable brick based on household garbage incineration slag, which is characterized by preparing the permeable brick based on household garbage incineration slag according to any one of claims 1-5, and comprising the following steps: s1, sequentially carrying out magnetic separation, screening and water washing on household garbage incinerator slag, adding a curing agent, curing at normal temperature, drying, and ball milling to obtain household garbage incinerator slag coarse particles and household garbage incinerator slag fine particles for later use; s2, crushing and screening the carbonized straws, immersing the straws in a metal salt solution for immersing, centrifuging and separating after the immersing is finished to obtain solid, drying and roasting to obtain modified biochar for later use; S3, premixing the household garbage incinerator slag coarse particles, the household garbage incinerator slag fine particles and the silane coupling agent, adding cement and sodium bentonite, mixing, stirring, adding basalt fibers, the modified biochar obtained in S2, and the toughening agent, continuously stirring, and finally adding the additive and water, and uniformly stirring to obtain a mixture; S4, placing the mixture obtained in the step S3 into a mould for compression molding to obtain a water permeable brick blank; S5, conveying the water permeable brick blank obtained in the S4 into a curing room, firstly carrying out moisture preservation and curing for 7d at normal temperature, then carrying out natural curing for 21-28d, and obtaining the water permeable brick after curing.
  7. 7. The method for preparing the water permeable brick based on the household garbage incinerator slag, as claimed in claim 6, wherein in S1, the curing agent is a cement-based curing agent, and the amount of the curing agent is 2-3% of the mass of the household garbage incinerator slag.
  8. 8. The method for preparing the water permeable brick based on the household garbage incinerator slag, which is characterized in that in S2, the carbonization temperature is 500-700 ℃, the carbonization time is 2-3h, the solid-to-liquid ratio of the straw and the metal salt solution is 1:10-20, and the baking is carried out under inert atmosphere, and the temperature is 300-400 ℃.
  9. 9. The method for preparing the water permeable brick based on the household garbage incinerator slag, as claimed in claim 6, wherein in the step S3, the stirring speed is 500-1000r/min, and the stirring time is 3-8min.
  10. 10. The method for preparing the water permeable brick based on the household garbage incinerator slag, as claimed in claim 6, wherein in the step S4, the pressure of the compression molding is 15-30MPa, and the time is 10-60S.

Description

Water permeable brick based on household garbage incinerator slag and preparation method thereof Technical Field The invention relates to the technical field of water permeable bricks, in particular to a water permeable brick based on household garbage incineration slag and a preparation method thereof. Background Along with the acceleration of the urban process and the deep promotion of sponge city construction, the water permeable brick is used as a novel building material with the functions of rainwater permeation, skid resistance, wear resistance, ecological environmental protection, is widely applied to scenes such as municipal sidewalks, park landscape areas, district roads and the like, and has the core requirements of ensuring the water permeability and having enough mechanical strength, durability and environmental protection. Meanwhile, the household garbage incineration disposal becomes a main stream mode of the current urban household garbage disposal due to the advantages of reduction, reclamation and harmlessness, but the discharge amount of the household garbage incineration slag generated by the household garbage incineration disposal is huge, if the household garbage incineration disposal is carried out by adopting a traditional landfill mode, a large amount of land resources are occupied, and secondary environmental hazards are possibly caused by leaching of trace heavy metal ions and soluble harmful substances contained in the slag, polluting soil and groundwater, so that the recycling of the household garbage incineration slag becomes an environment and resource problem to be solved urgently. At present, in the prior art, the household garbage incineration slag is tried to be used as aggregate to prepare the water permeable brick, so that the solid waste resource utilization is realized, and the problems of environmental pressure of slag landfill and shortage of natural aggregate resources are solved to a certain extent. However, the existing slag water permeable bricks still have a plurality of technical pain points in practical application, after the household garbage incineration slag is incinerated, the surface is rough, more micropores exist, the water absorption rate is higher, the interfacial adhesion force with cementing materials such as cement is weaker, and when the brick is directly used as aggregate, the problems of insufficient brick body strength, slag falling, cracking and the like are easy to occur. The household garbage incinerator slag contains trace heavy metal ions, the efficient fixation of heavy metal is difficult to realize only through simple water washing and solidification treatment in the prior art, and the prepared water permeable brick is easy to leach out heavy metal ions under the long-term rainwater infiltration effect, pollutes underground water and soil, and cannot meet the environmental protection requirement of green building materials. Disclosure of Invention The invention aims to provide a water permeable brick based on household garbage incineration slag and a preparation method thereof, wherein the high-duty ratio of the household garbage incineration slag is used to realize the solid waste absorption of the household garbage incineration, and meanwhile, the problems of environmental protection pain points caused by leaching of heavy metals in the slag and the mechanical properties of the water permeable brick are solved through the synergistic effect of modified biochar, sodium bentonite and cement. In order to achieve the aim, the invention provides a water permeable brick based on household garbage incineration slag, which comprises, by mass, 60-70 parts of household garbage incineration slag, 15-20 parts of cement, 0.1-0.5 part of basalt fiber, 1-3 parts of modified biochar, 2-4 parts of sodium bentonite, 1-2 parts of additive, 0.5-2 parts of toughening agent, 0.05-0.5 part of silane coupling agent and 2-6 parts of water. Preferably, the household garbage incinerator slag comprises household garbage incinerator slag fine particles with the particle size of 0.1-2mm and household garbage incinerator slag coarse particles with the particle size of 3-15mm, and the mass ratio of the household garbage incinerator slag fine particles to the household garbage incinerator slag coarse particles is 3-4:6-7. Preferably, the modified biochar is a nano metal-loaded biochar, and the nano metal comprises one or more of nano metal manganese, nano metal iron, nano metal magnesium and nano metal aluminum. Preferably, the additive comprises one or more of an air entraining agent, a water reducing agent, an early strength agent, an antibacterial agent, a water proofing agent and a retarder. Preferably, the air entraining agent comprises one or more of a rosin thermopolymer, saporin and sodium lauryl sulphate. Preferably, the antimicrobial agent comprises one or more of nano zinc oxide, nano titanium dioxide, silver-loaded zeolite and chitosan. Preferably, the wate