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High-strength aluminum oxide light-weight heat insulation brick and preparation method thereof

A technology of lightweight heat insulation and alumina, applied in the field of lightweight refractory materials, can solve the problems of difficulty in making bulk density alumina hollow sphere products, large energy consumption of alumina hollow spheres, long sample drying cycle, etc. The drying cycle, the line change rate is small, and the drying cycle is short.

Active Publication Date: 2013-04-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are also the following disadvantages: (1) the preparation of alumina hollow spheres consumes a lot of energy; (2) it is difficult to produce alumina hollow spheres with lower bulk density, so their thermal insulation performance is affected
However, the main disadvantages of this method are: (1) Due to the large amount of fine powder in the raw material, the sample has a large linear shrinkage after sintering, and the sample structure is destroyed; (2) Due to the large amount of water in the sample, the sample drying cycle is very long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A high-strength alumina lightweight heat-insulating brick and a preparation method thereof. α-Al with a particle size of 0.074~0.147mm at 25~30wt% 2 o 3 Fine powder, 35~40wt% α-Al with a particle size of 0.043~0.074mm 2 o 3 Fine powder, 10~15wt% α-Al with particle size less than 0.043mm 2 o 3 Fine powder, 10~15wt% α-Al 2 o 3 Micropowder, 3~6wt% ρ-Al 2 o 3 Micropowder as raw material and 2~5wt% andalusite fine powder as raw material, plus 0.1~0.5wt% MgO micropowder, 30~35wt% water and 0.1~0.3wt% polycarboxylate water reducer, Pre-mix for 5-10 minutes to prepare the pre-mix; then add foam to the pre-mix, mix evenly, pour into shape, dry in microwave, then fire at 1450-1550°C and keep warm for 3-6 hours, that is A high-strength aluminum oxide lightweight heat-insulating brick is prepared.

[0018] In this embodiment 1: the particle size of andalusite<0.074mm; the foam is made by using a foaming agent with a foaming ratio of 7 to 10 times, and its addition is 0.6 ...

Embodiment 2

[0021] A high-strength alumina lightweight heat-insulating brick and a preparation method thereof. α-Al with a particle size of 0.074~0.147mm at 30~35wt% 2 o 3 Fine powder, 30~35wt% α-Al with a particle size of 0.043~0.074mm 2 o 3 Fine powder, 10~15wt% α-Al with particle size less than 0.043mm 2 o 3 Fine powder, 10~15wt% α-Al 2 o 3 Fine powder, 2~5wt% andalusite fine powder and 3~6wt% ρ-Al 2 o 3 Micro powder as raw material, plus 0.1~0.5wt% of the raw material TiO 2 Micropowder, 30~35wt% of water and 0.1~0.3wt% of inorganic salt water reducing agent are pre-mixed for 5~10 minutes to make a premix; then add foam to the premix, mix well, and pour into molding. Microwave drying, and then heat preservation at 1450-1550°C for 3-6 hours to obtain high-strength alumina lightweight heat-insulating bricks.

[0022] In this embodiment 2: the particle size of andalusite<0.074mm; the foam is made by using a foam agent with a foaming ratio of 7 to 10 times, and its addition is 0....

Embodiment 3

[0025] A high-strength alumina lightweight heat-insulating brick and a preparation method thereof. α-Al with a particle size of 0.074~0.147mm at 35~40wt% 2 o 3Fine powder, 25~30wt% α-Al with a particle size of 0.043~0.074mm 2 o 3 Fine powder, 10~15wt% α-Al with particle size less than 0.043mm 2 o 3 Fine powder, 10~15wt% α-Al 2 o 3 Fine powder, 2~5wt% andalusite fine powder and 3~6wt% ρ-Al 2 o 3 Micropowder is the raw material, plus 0.1~0.5wt% Cr of the raw material 2 o 3 Micropowder, 30~35wt% of water and 0.1~0.3wt% of sulfonic acid-based water reducing agent are premixed for 5~10 minutes to prepare a premix; then add foam to the premix, mix well, and pour into molding. Microwave drying, and then heat preservation at 1450-1550°C for 3-6 hours to obtain high-strength alumina lightweight heat-insulating bricks.

[0026] In this embodiment 3: the particle size of andalusite<0.074mm; the foam is made by using a foaming agent with a foaming ratio of 7 to 10 times, and it...

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Abstract

The invention relates to a high-strength aluminum oxide light-weight heat insulation brick and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: premixing 25-40 wt% of alpha-Al2O3 fine powder with the particle size of 0.074-0.147mm, 25-40 wt% of alpha-Al2O3 fine powder with the particle size of 0.043-0.074mm, 10-15 wt% of alpha-Al2O3 fine powder with the particle size of less than 0.043mm, 10-15 wt% of alpha-Al2O3 micropowder, 3-10 wt% of rho-Al2O3 micropowder and 2-10 wt% of three-stone used as raw materials with combustion improver (accounting for 0.1-1 wt% of the raw materials), water (accounting for 20-35wt% of the raw materials) and water reducing agent (accounting for 0.1-0.7 wt% of the raw materials) for 5-10 minutes to obtain a premix; and adding foam into the premix, evenly mixing, carrying out casting molding and microwave drying, and keeping the temperature of 1450-1750 DEG C for 3-6 hours to obtain the high-strength aluminum oxide light-weight heat insulation brick. The invention has the characteristics of simple technique and energy conservation. The product has the characteristics of high strength, small linear variation rate, low volume density, low heat conductivity coefficient and short drying cycle.

Description

technical field [0001] The invention belongs to the technical field of lightweight refractory materials, and in particular relates to a high-strength alumina lightweight heat-insulating brick and a preparation method thereof. Background technique [0002] Energy conservation is one of the important measures to maintain sustainable economic development, and heat preservation is one of the important measures to save energy. Therefore, heat insulation materials with micro-nano pores play an important role in the field of heat insulation. Traditional high-temperature furnaces have disadvantages such as low heating rate, large heat capacity, large energy consumption, and short service life due to the heavy structure. Therefore, the development of high-strength, light-weight, low-thermal conductivity, and high-temperature furnaces can meet the needs of light-weight structure high-temperature furnaces. The required lining material is the main direction of research. [0003] Lightw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 李远兵廖佳刘静静赵雷李亚伟李淑静桑绍柏张文泽
Owner WUHAN UNIV OF SCI & TECH
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