Preparation method of fly ash based porous thermal insulation material with low thermal conductivity

A technology of low thermal conductivity and thermal insulation materials, applied in the field of porous thermal insulation materials, can solve the problems of no more than 50% of fly ash, less than 50% utilization rate of fly ash, and low utilization rate of fly ash, so as to achieve easy operation, environmental protection, cost saving effect

Inactive Publication Date: 2015-03-25
INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fly ash is currently the largest amount of industrial waste in my country, but the utilization rate is less than 50%, which not only occupies a large amount of land, but also causes pollution to the environment
At present, the utilization of fly ash is mainly used in engineering construction, and the utilization method is mainly to produce sintered porous bricks and aerated concrete, but the amount of fly ash in these methods is generally not more than 50%, so the utilization rate of fly ash not tall

Method used

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  • Preparation method of fly ash based porous thermal insulation material with low thermal conductivity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Mix 100g of fly ash with 1g of gum arabic and 10g of glass powder, add water and stir to make a slurry with a solid phase content of 50 wt%, and obtain a stable fly ash slurry after ball milling for 24 hours;

[0039] (2) Prepare a sodium lauryl sulfate aqueous solution with a concentration of 0.4wt% as a foaming liquid, and stir for 3 minutes at a speed of 800 rpm to obtain a foam;

[0040] (3) Take 50g of fly ash slurry and add 2.27g of double-fast sulphoaluminate cement while stirring at 200 rpm. After the cement is evenly dispersed, add 15g of foam and stir evenly;

[0041] (4) Pour the evenly stirred foam slurry into a glass mold and let it solidify for 24 hours to obtain a wet billet;

[0042] (5) Remove the mold after the wet billet is completely cured, air-dry it naturally at room temperature for 2 days, then move it into an oven at 60°C for 24 hours, and finally dry it in an oven at 120°C for 12 hours to obtain a dry porous billet ;

[0043] (6) Sinter th...

Embodiment 2

[0046] (1) Mix 100g of fly ash, 1g of sodium hexametaphosphate, 0.5g of sodium carboxymethylcellulose and 20g of glass powder, add water and stir to make a slurry with a solid phase content of 50 wt%, and stabilize it after ball milling for 20 hours fly ash slurry;

[0047] (2) Prepare a sodium lauryl sulfate aqueous solution with a concentration of 0.4 wt% as a foaming liquid, and stir for 5 minutes at a speed of 800 rpm to obtain a foam;

[0048] (3) Take 50g of fly ash slurry and add 2.08g of double-fast sulphoaluminate cement while stirring at 180 rpm. After the cement is evenly dispersed, add foam accounting for 15g of the mass of the fly ash slurry and stir Uniform;

[0049] (4) Pour the evenly stirred foam slurry into a polytetrafluoroethylene mold and leave it to solidify for 20 hours to obtain a wet billet;

[0050] (5) Remove the mold after the wet body is completely cured, air-dry it naturally at room temperature for 1 day, then move it into an oven at 60°C for 20...

Embodiment 3

[0053] (1) Mix 100g of fly ash with 0.5g of sodium hexametaphosphate and 0.1g of sodium carboxymethylcellulose, add water and stir to make a slurry with a solid phase content of 55 wt%, and obtain stable pulverized coal after ball milling for 22 hours Mortar material;

[0054](2) Prepare a sodium lauryl sulfate aqueous solution with a concentration of 0.2wt% as a foaming liquid, and stir for 3 minutes at a speed of 1000 rpm to obtain a foam;

[0055] (3) Take 50g of fly ash slurry and stir at 200rpm while adding 2.75g of double-fast sulfoaluminate cement accounting for the mass of fly ash. After the cement is evenly dispersed, add 20g of fly ash slurry foam and stir well;

[0056] (4) Pour the evenly stirred foam slurry into a stainless steel mold and let it stand and solidify for 20 hours to obtain a wet billet;

[0057] (5) Remove the mold after the wet body is completely cured, air-dry it naturally at room temperature for 1.5 days, then move it into an oven at 60°C for 22...

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Abstract

The invention discloses a preparation method of a fly ash based porous thermal insulation material with low thermal conductivity. The preparation method comprises the following steps: (1), fly ash, a water reducing agent, a dispersing agent and a flux are mixed and stirred with water into slurry; (2), a foaming agent is completely dissolved in water and stirred to obtain foam; (3), quick setting and hardening sulfoaluminate cement is added while the fly ash slurry is stirred, the foam is added after the cement is dispersed uniformly, and foam slurry is obtained after uniform stirring; (4), the foam slurry is poured into a mold and left for standing and curing; (5), demolding and drying are performed after a wet green body is cured completely; and (6), a porous green body is placed in a high-temperature sintering furnace for sintering, and the fly ash based porous material is obtained. The fly ash based porous material is prepared with a method of first independent foaming of a foaming liquid and then mixing and curing of the foaming liquid and the slurry and has low thermal conductivity, an organic template or addition of an organic volatile pore forming agent is not needed in the process, and a cementing material is an inorganic material, so that waste discharge in the material preparation process is avoided, the cost is saved, and the environment is protected.

Description

technical field [0001] The invention belongs to the technical field of porous thermal insulation materials, and relates to a preparation method of a fly ash-based porous thermal insulation material with low thermal conductivity. Background technique [0002] Fly ash is the fine ash in the flue gas produced by coal combustion. It generally refers to the fine ash collected from the flue gas in coal-fired thermal power plants. Its main components are silica, alumina, calcium oxide and iron oxide. Fly ash is the largest amount of industrial waste in my country at present, but the utilization rate is less than 50%, which not only occupies a large amount of land, but also causes pollution to the environment. At present, the utilization of fly ash is mainly used in engineering construction, and the utilization method is mainly to produce sintered porous bricks and aerated concrete, but the amount of fly ash in these methods is generally not more than 50%, so the utilization rate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B28/06C04B18/08
CPCY02W30/91
Inventor 龚伦伦程旭东陆松李晔冯俊杰曹卫
Owner INST OF ADVANCED TECH UNIV OF SCI & TECH OF CHINA
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