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A preparation method of lightweight fly ash thermal insulation porous ceramics

A porous ceramic, thermal insulation technology, applied in the field of preparation of lightweight fly ash thermal insulation porous ceramics, can solve the problems of non-compliance with low-carbon environmental protection policies, environmental pollution, non-compliance with environmental protection policies, etc., and achieve short production cycle , solve environmental pollution, high intensity effect

Inactive Publication Date: 2015-09-16
HEFEI KESIFU SAFETY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Li Shaorong and others used organic resin foamed microspheres as pore-forming agents to prepare porous ceramics. The pore size is uniform and the size is controllable, but the gas emitted when the organic pore-forming agents are burned out will pollute the environment, which is not in line with environmental protection policies; Wu Yongbin et al. Humans use protein foaming method to prepare porous ceramic composite materials, which does not produce harmful substances that pollute the environment, but a large amount of protein is added and eventually burned to emit a large amount of gas, which is not in line with the low-carbon environmental protection policy

Method used

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  • A preparation method of lightweight fly ash thermal insulation porous ceramics
  • A preparation method of lightweight fly ash thermal insulation porous ceramics

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Experimental program
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Embodiment 1

[0024] The weight percentage of raw material components is: fly ash 35wt%, agar powder 0.3wt%, foam stabilizer sodium hexametaphosphate (PAAS) 0.15wt%, dispersant sodium polyacrylate (SHMP) 0.1wt%, foaming agent twelve Sodium alkyl sulfate (K12) 0.4wt%, water 64.05wt%.

[0025] The specific operation steps for preparing thermal insulation porous ceramics are as follows:

[0026] (1) Add 57.47g of fly ash, 0.16g of PAAS, 0.25g of SHMP and 72.53g of water into the ball mill according to the ratio of the above raw materials. Add 0.38g of agar powder into 25g of water, dissolve at 90°C to obtain agar hydrosol; take 95g of the primary slurry, preheat the primary slurry in a water bath at a temperature of 60°C, add the agar hydrosol, and dissolve at a low speed of 400 rpm. Next, the stirrer is stirred for about two minutes to make it fully mixed, and a uniform and stable ceramic slurry with a solid content of 35wt% is obtained; (3) Add foaming agent K12 of 0.4wt% of the ceramic slu...

Embodiment 2

[0029] The weight percentage of raw material components is: fly ash 40wt%, agar powder 0.3wt%, foam stabilizer sodium hexametaphosphate (PAAS) 0.15wt%, dispersant sodium polyacrylate (SHMP) 0.1wt%, foaming agent twelve Sodium alkyl sulfate (K12) 0.4wt%, water 59.05wt%.

[0030] The specific operation steps for preparing thermal insulation porous ceramics are as follows:

[0031] Put 67.20g of fly ash, 0.17g of PAAS, 0.25g of SHMP and 72.80g of water into the ball mill, the speed of the ball mill is 180 r / min, and the ball milling time is 24 hours to obtain the primary slurry; (2) Add 0.38g of agar powder into 20g of water, the temperature is 90 Dissolve at ℃ to obtain agar hydrosol; take 100g of the primary slurry, preheat the primary slurry in a water bath at a temperature of 60°C, add the agar hydrosol, and stir with a stirrer for about two minutes at a low speed of 400 rpm to make it Mix well to obtain a uniform and stable ceramic slurry with a solid content of 40wt%; (3) ...

Embodiment 3

[0034] The weight percentage of raw material components is: fly ash 35wt%, agar powder 0.2wt%, foam stabilizer sodium hexametaphosphate (PAAS) 0.15wt%, dispersant sodium polyacrylate (SHMP) 0.1wt%, foaming agent twelve Sodium alkyl sulfate (K12) 0.4wt%, water 64.15wt%.

[0035] The specific operation steps for preparing thermal insulation porous ceramics are as follows:

[0036] Add 57.47g of fly ash, 0.16g of PAAS, 0.25g of SHMP and 72.53g of water into the ball mill, the speed of the ball mill is 180 r / min, and the ball milling time is 24 hours to obtain the primary slurry; (2) Add 0.26g of agar powder into 25g of water, the temperature is 90 Dissolve at ℃ to obtain agar hydrosol; take 95g of primary slurry, preheat the primary slurry in a water bath at a temperature of 55℃, add agar hydrosol, and stir with a stirrer for about two minutes at a low speed of 400 rpm to make it Mix well to obtain a uniform and stable ceramic slurry with a solid content of 35wt%; (3) Add 0.4wt% f...

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Abstract

The invention relates to a preparation method of a heat insulating porous ceramic made from light coal ash. The preparation method comprises the following steps: (1) taking coal ash, ground glass, a dispersant and a foam stabilizer, and adding water to stir and ball-mill to obtain primary slurry; (2) preparing agar-containing stable ceramic slurry; (3) adding a surfactant and stirring and foaming to obtain foam slurry; (4) pouring the foam slurry into a die, and curing at room temperature; (5) demoulding and drying to obtain a porous ceramic blank; and (6) sintering the porous ceramic blank at a low temperature to obtain the porous ceramic. According to the preparation method provided by the invention, coal ash is utilized to the maximum extent. In addition, agar which is free from environmental pollution is decomposed as a gel, and the dosage of the agar can be reduced to 0.1wt%, so that the porous ceramic meets the low-carbon environment-friendly policy. The porosity of the porous ceramic prepared by the method is 88-91%, the density is 0.24-0.31g / cm<3>, the heat conductivity coefficient is 0.051-0.072W / (m.K) and the compressive strength is 0.4-1.0MPa.

Description

technical field [0001] The invention belongs to the technical field of novel light heat insulating materials, and in particular relates to a preparation method of light fly ash heat insulating porous ceramics. Background technique [0002] my country's economy is now in a period of rapid development, and energy and environmental protection issues have become increasingly prominent. The strategy of energy conservation and environmental protection in buildings is in line with the current sustainable development strategy. Due to the relationship between supply and demand, the development of thermal insulation materials in my country is extremely rapid. Porous ceramics are used as thermal insulation materials due to their advantages such as small bulk density, large porosity, and low thermal conductivity, and have great development and application prospects in daily life and production. [0003] When porous ceramics are used as thermal insulation materials, while ensuring excel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/02C04B38/06B09B3/00
Inventor 曹卫陆松程旭东龚伦伦杨晖张瑞芳
Owner HEFEI KESIFU SAFETY TECH
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