Method for preparing porous mullite heat insulating material at low cost

A technology of porous mullite and thermal insulation materials, applied in the field of thermal insulation materials, can solve problems such as difficult quality control and assurance, poor crack resistance, poor weather resistance, low construction efficiency, etc., and achieve good creep resistance and erosion resistance, Good thermal stability and easy handling effect

Inactive Publication Date: 2013-08-21
HEFEI KESIFU SAFETY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's thermal insulation materials are currently in a period of development. Although some gratifying progress has been made, the overall technical level is backward, especially in the research and development of thermal insulation materials.
At present, a large number of thermal insulation materials used in civil engineering in my country are still dominated by traditional expanded perlite thermal insulation materials, which have a high water absorption rate, poor crack resistance and weather resistance, and have great limitations in application. During construction, they need to survive many times. The construction efficiency is low, and the insulation mortar is prepared on site, and its quality is not easy to control and guarantee

Method used

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  • Method for preparing porous mullite heat insulating material at low cost
  • Method for preparing porous mullite heat insulating material at low cost

Examples

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Effect test

Embodiment 1

[0032] Sieve the fly ash and clay with 40 meshes, mix well with 10% hydrochloric acid solution for 24 hours, discard the supernatant, wash with water 5 times, and dry. Sieve the dried fly ash and clay to 100 meshes respectively, pre-fire at 850°C, raise the temperature from room temperature to 850°C at a rate of 5°C / min, and keep it warm for 240 minutes to obtain boiled fly ash and boiled clay . Weigh the cooked fly ash, cooked clay and alumina respectively according to the weight ratio of 3:1:1, and put them into the ball mill tank together, add 1% sodium polyacrylate, add appropriate amount of water, and prepare the solid phase content to be 40%. The slurry was ball-milled in a planetary ball mill for 24 hours, the rotating speed of the ball mill was 180r / min; the ratio of material to balls was 1:3, and the amount of powder charged was 1 / 3 of the capacity of the ball mill tank to obtain a slurry. Add 1% sodium lauryl sulfate into the ball-milled slurry, and stir it at a spe...

Embodiment 2

[0035] Sieve the fly ash and clay with 40 meshes, mix them with 10% hydrochloric acid solution for 24 hours, discard the supernatant, wash with water 5 times, and dry. Sieve the dried fly ash and clay to 100 meshes respectively, pre-fire at 850°C, raise the temperature from room temperature to 850°C at a rate of 5°C / min, and keep it warm for 240 minutes to obtain boiled fly ash and boiled clay . Weigh the cooked fly ash, cooked clay and alumina respectively according to the weight ratio of 3:1:1, and put them into the ball mill jar together, add 0.8% sodium polyacrylate, add an appropriate amount of water, and prepare a solid phase content of 40% The slurry was ball milled in a planetary ball mill for 24 hours, and the rotating speed of the ball mill was 180r / min. The ratio of the powder to the ball is 1:3, and the amount of the powder is 1 / 3 of the capacity of the ball mill tank to obtain a slurry. Add 0.8% sodium lauryl sulfate to the ball-milled slurry, and stir it for 5 ...

Embodiment 3

[0038]Sieve the fly ash and clay with 40 meshes, mix them with 10% hydrochloric acid solution for 24 hours, discard the supernatant, wash with water 5 times, and dry. Sieve the dried fly ash and clay to 100 meshes respectively, pre-fire at 850°C, raise the temperature from room temperature to 850°C at a rate of 5°C / min, and keep it warm for 240 minutes to obtain boiled fly ash and boiled clay . Weigh the cooked fly ash, cooked clay and alumina respectively according to the weight ratio of 3:1:1, and put them into the ball mill jar together, add 0.8% sodium polyacrylate, add an appropriate amount of water, and prepare a solid phase content of 40% The slurry was ball milled in a planetary ball mill for 24 hours, and the rotating speed of the ball mill was 180r / min. The ratio of the powder to the ball is 1:3, and the amount of the powder is 1 / 3 of the capacity of the ball mill tank to obtain a slurry. Add 0.8% sodium dodecylbenzene sulfonate into the ball-milled slurry, and sti...

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Abstract

The invention relates to a method for preparing a porous mullite heat insulating material at low cost. The method specifically comprises the following operation steps of: (1) raw material pretreatment; (2) material mixing; (3) foaming; (4) slurry injection; (5) demoulding and drying; and (6) sintering. The obtained mullite heat insulating material has the porosity in the range from 85% to 93%, the volume density in the range from 0.21 to 0.36 g/cm<3>, the heat conductivity coefficient in the range from 0.05 to 0.10 W/(m.K) and the compressive strength in the range from 1.0 to 3.0 MPa. The heat insulating material prepared by the invention takes mullite as the principal crystalline phase, and mullite is low in heat conductivity, low in specific density and good in thermal stability, and has unique advantages such as excellent creep resistance and erosion resistance and the like; and the major raw material utilized in industrial waste: coal ash; and as a result, a technical route which is low in cost, high in added value and simple in technical process is provided for comprehensive utilization of the coal ash.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials used in civil engineering, and in particular relates to the preparation of a mullite thermal insulation material. Background technique [0002] my country is a country that is relatively short of energy. With the rapid development of economic construction, energy shortage has become an important factor restricting the development of the national economy. Energy consumption in the field of people's livelihood in my country is huge, and building energy consumption accounts for a relatively large proportion of my country's total energy consumption, about 30%. my country's thermal insulation materials are currently in a development period. Although some gratifying progress has been made, the overall technical level is backward, especially in the research and development of thermal insulation materials. At present, a large number of thermal insulation materials used in civil engi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B35/185C04B35/622
Inventor 张瑞芳王华陆松程旭东杨晖龚伦伦
Owner HEFEI KESIFU SAFETY TECH
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