Biochar, preparation method thereof, foam concrete and preparation method of foam concrete

A technology of foam concrete and biochar, applied in the field of concrete, can solve the problems of heavy weight, high density, poor thermal insulation performance and thermal conductivity, etc., and achieve the effect of reducing the leaching of heavy metals and strengthening mechanical properties

Pending Publication Date: 2022-01-21
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But these are not lightweight foam bricks, they are heavy and dense, and have poor thermal insulation and thermal conductivity.

Method used

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  • Biochar, preparation method thereof, foam concrete and preparation method of foam concrete
  • Biochar, preparation method thereof, foam concrete and preparation method of foam concrete
  • Biochar, preparation method thereof, foam concrete and preparation method of foam concrete

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preparation example Construction

[0038] The invention provides a kind of preparation method of biochar, comprises the following steps:

[0039] Crushing plant-based biomass to obtain biomass particles;

[0040] The biomass particles are carbonized and pyrolyzed to generate the biochar.

[0041] In the present invention, the plant-based biomass includes one or more of barley grass, sawdust, straw, branches and peanut shells, preferably peanut shells; the particle size of the biomass particles is 2 to 5 mm, or It can be 3 to 4 mm.

[0042] In the present invention, the temperature of the carbonization and pyrolysis is 470-530°C, may also be 480-520°C, and further may be 500-510°C; the time of the carbonization and pyrolysis is 1-2h; The heating rate of the solution temperature is 10-15° C. / min, and may also be 10-12° C. / min.

[0043] In the present invention, biochars prepared at different pyrolysis temperatures have different properties such as porosity, carbon content, and carbon stability. The biochar ob...

Embodiment 1

[0071] After the peanut shells are crushed to a particle size of 2-5mm, the temperature is raised to 500°C at a heating rate of 10°C / min, and the carbonization and pyrolysis is carried out at this temperature for 1 hour. The carbonized pyrolysis product is crushed to 50-500 μm to obtain biochar pyrolyzed at 500° C.

Embodiment 2

[0073] After the peanut shells are crushed to a particle size of 2-5mm, the temperature is raised to 700°C at a heating rate of 10°C / min, and the carbonization and pyrolysis is carried out at this temperature for 2.5 hours. The carbonized pyrolysis product is pulverized to 50-500 μm to obtain biochar pyrolyzed at 700° C.

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Abstract

The invention relates to the technical field of concrete, and concretely relates to a biochar, a preparation method thereof, a foam concrete and a preparation method of the foam concrete. The biochar with excellent performance is prepared, and the foam concrete is prepared by taking the biochar and sludge incineration ash as raw materials. The preparation method of the foam concrete comprises the following steps: premixing the ash, cement and biochar to obtain a dry mixture; carrying out wet mixing on the obtained dry mixture and water to obtain a wet mixture; mixing the wet mixture with a water reducing agent to obtain a mixture; mixing the obtained mixture with foam to obtain slurry; and pre-curing and curing the obtained slurry in sequence to obtain the foam concrete. According to the embodiment of the invention, the sludge incineration ash is successfully recycled, so that the sludge incineration ash is recycled, and the fixation of the carbon element is realized. The obtained concrete is uniform in pore size distribution, and the physical properties including compression resistance, fracture resistance, dry density, water resistance, heat conductivity coefficient and the like all meet the building industry standard foam concrete (JG / T 266-2011).

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a biochar and a preparation method thereof, and a foam concrete and a preparation method thereof. Background technique [0002] As a kind of hazardous waste, sludge incineration ash is produced in large quantities every year, but so far it can only be disposed of by landfill, which not only occupies land, pollutes soil and groundwater, but also needs to bear high costs. As the available landfill sites become less and less, sludge incineration ash may be prohibited from landfill disposal in the near future. Therefore, it is urgent to find resourceful and harmless utilization technologies for sludge incineration ash. [0003] Sludge incineration ash is rich in inorganic mineral components such as silicon, aluminum and iron oxides. Its composition is similar to clay, but its properties are quite different from clay, and there is usually a certain amount of heavy metal pollution. I...

Claims

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Application Information

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IPC IPC(8): C01B32/05C04B28/04C04B18/10C04B14/02C04B38/10C04B111/40C04B111/27
CPCC01B32/05C04B18/10C04B14/022C04B28/04C04B38/106C04B2111/40C04B2201/50C04B2201/32C04B2111/27C04B2103/302Y02W30/91
Inventor 赵玲张颖郭天宝杨帆曹心德
Owner SHANGHAI JIAO TONG UNIV
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