Mullite fire resistant insulation products and preparation method thereof

A technology of refractory heat preservation and mullite, which is applied in the field of heat preservation materials, can solve the problems of large thermal conductivity, large proportion of heat preservation materials, and limited application fields, and achieve the effects of small volume density, low heat conductivity and high compressive strength

Inactive Publication Date: 2009-02-11
徐进清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditional refractory insulation materials include soft refractory insulation materials and hard refractory insulation materials. These insulation materials have defects such as large specific gravity and high thermal conductivity, and because of the use temperature problem, they cannot directly contact the flame, and their application fields are limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1, mullite refractory insulation products, by weight parts: 12 parts of mullite powder, 20 parts of industrial alumina, 10 parts of kyanite powder, 32 parts of white hair clay, 4 parts of polystyrene and saw foam respectively, Take 80 parts of water, mix in the mud for 3 times to achieve the purpose of uniform mixture, then pour into the mold to form, and then demould after natural drying to obtain a semi-finished product. The semi-finished product is dried until the moisture content is less than 0.8%wt (weight percentage), and then the temperature is gradually raised to 1400°C in the sintering furnace to control the temperature for 4 hours; gradually cooled to room temperature to obtain ultra-light, low thermal conductivity, high heavy-fired mullite refractory insulation products.

[0014] Al in mullite powder 2 o 3 >55%wt, Fe 2 o 3 2 o 3 >99%wt, particle size ≤180 mesh; Al in kyanite powder 2 o 3 >58%wt, Fe 2 o 3 2 o 3 >35%wt, Fe 2 o 3 <1.5%wt, ...

Embodiment 2

[0015] Embodiment 2: In this embodiment, 15 parts of mullite powder, 25 parts of industrial alumina, 15 parts of kyanite powder, 36 parts of white hair clay, 10 parts of sawdust, and 85 parts of water were mixed in a mud mixer for 3 It is poured over and over to achieve the purpose of uniform mixture, and then poured into the mold for casting, and then the semi-finished product is demoulded after natural drying and setting. Dry the semi-finished product until the moisture content is less than 0.8%wt, then gradually raise the temperature to 1420°C in the sintering furnace and control the temperature for 3.5 hours; Example 1.

Embodiment 3

[0016] Embodiment 3: In this embodiment, 16 parts of mullite powder, 30 parts of industrial alumina, 18 parts of kyanite powder, 40 parts of white hair clay, 12 parts of polystyrene, and 90 parts of water are mixed in a mud mixer forcibly Refined 4 times to achieve the purpose of fully uniform mixture, and then injected into the mold for casting, natural drying and setting, demoulding to obtain a semi-finished product. The semi-finished product is dried until the moisture content is less than 0.8%wt, and then the temperature is gradually raised to 1450°C in the sintering furnace to control the temperature for 3 hours; gradually cooled to room temperature to obtain ultra-light, low thermal conductivity, high-weight fired mullite refractory insulation products, and other products of the same Example 1.

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Abstract

A mullite refractory thermal insulation product takes mullite powder, industrial alumina powder and kyanite powder as main materials and takes white wool soil and combustible substances as auxiliary materials, and the mullite refractory thermal insulation product is formed by adding water, mixing, shaping and sintering. The parts by weight of various raw materials are: 12 to 16 parts of mullite powder, 20 to 30 parts of industrial alumina powder, 10 to 18 parts of kyanite powder, 32 to 40 parts of white wool soil, 8 to 12 parts of combustible substances and 80 to 90 parts of water. Al2O3 in the mullite powder is more than 55 percent by weight, Fe2O3 is less than 1 percent by weight, the particle size is not more than 180 meshes; the Al2O3 in the industrial alumina powder is more than 99 percent by weight, the particle size is not more than 180 meshes; the Al2O3 in the kyanite powder is more than 58 percent by weight, the Fe2O3 is less than 1 percent by weight, the particle size is not more than 120 meshes; the Al2O3 in the white wool soil is more than 35 percent by weight, the Fe2O3 is less than 1.5 percent by weight, the particle size is not more than 180 meshes; the combustible substances are polystyrene and / or sawdust with the particle size of less than 1mm. The specific gravity of the product is 0.5 to 0.6g / cm<3>. The product has super-lightweight, low thermal conductivity, high re-burning and can be directly contacted with flame.

Description

technical field [0001] The invention belongs to the field of thermal insulation materials, and in particular relates to an ultra-light, low thermal conductivity, high-weight burnt mullite refractory thermal insulation product and a preparation method thereof. Background technique [0002] Traditional refractory insulation materials include soft refractory insulation materials and hard refractory insulation materials. These insulation materials have defects such as large specific gravity and high thermal conductivity, and because of the use temperature problem, they cannot directly contact the flame, and their application fields are limited. Therefore, the development and utilization of environmentally friendly and energy-saving refractory insulation materials that are ultra-light, low thermal conductivity, high reburning, and can directly contact flames is an important development direction of refractory insulation materials. , Improving the economic benefits of enterprises ...

Claims

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Application Information

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IPC IPC(8): C04B35/101C04B35/622
Inventor 徐进清李建设申会超徐保进
Owner 徐进清
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