Lightweight aluminum oxide castable and preparation method thereof

A lightweight castable and alumina technology, applied in the field of lightweight castables, can solve the problems of complex synthesis process of alumina hollow spheres, reduce the use temperature, increase the preparation cost, etc., and achieve easy mass production, high refractoriness, The effect of enhancing thermal insulation and mechanical properties

Inactive 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

"A kind of aluminum oxide hollow sphere lightweight heat-insulating refractory castable" (CN 101723687 A) patent technology discloses the preparation of alumina light-weight heat-insulating castable with alumina hollow spheres and synthetic mullite particles as main raw materials method, although the castable prepared by this method has high refractoriness, it has the following disadvantages: (1) The synthetic process of the raw material alumina hollow sphere is complicated and expensive; (2) A large amount of aluminate cement is used, which reduces its service temperature, increased the cost of its preparation
The patented technology of "powder composition for heat insulation castable and heat insulation castable using it" (CN 102336575 A) discloses a method for powder composition for heat insulation castable and heat insulation castable using it. It is relatively low, but has the following disadvantages: (1) The raw materials used are hollow particles, which is a secondary process, the process is complicated, and the cost is high; (2) It needs to be combined with high-alumina cement, which reduces its use temperature and increases its preparation cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] An alumina lightweight castable and a preparation method thereof. First with 80~82wt% α-Al 2 o 3 Fine powder and 18~20wt% ρ-Al 2 o 3 Micropowder is the raw material, plus 1~2wt% pseudoboehmite micropowder and 5~6wt% kyanite of the raw materials, mix evenly, then add 0.30~0.40wt% sodium tripolyphosphate, 0.25~ 0.35wt% sodium hexametaphosphate, 0.1~0.2wt% sodium lignosulfonate and 15~19wt% water, mixed for 3~15min to prepare a mixture; then add 0.1~0.3wt% of the raw materials to the mixture The foam made of foaming agent is stirred for 3-5 minutes, poured and vibrated, and the molded body is dried at 110-150°C for 12-36 hours to obtain aluminum oxide lightweight castables.

[0015] Adopt the technical scheme described in this embodiment, obtain apparent porosity 25~29%, volume density is 2.2~2.5g / cm 3 And aluminum oxide lightweight castables with a flexural strength of 4.2~5.0MPa. After firing at 1550~1650℃, the holding time is 3~5h, and the apparent porosity is 23~...

Embodiment 2

[0017] An alumina lightweight castable and a preparation method thereof. First with 82~85wt% α-Al 2 o 3 Fine powder and 15~18wt% ρ-Al 2 o 3 Micropowder is the raw material, plus 2~3wt% pseudoboehmite micropowder and 8~10wt% andalusite of the raw materials, mix well, then add 0.30~0.40wt% sodium tripolyphosphate, 0.20~0.30wt% of the raw materials The sodium hexametaphosphate of wt% and the water of 19~23wt%, mix 3~15min, make mixture; Then add the foam that described raw material 0.3~0.5wt% foaming agent is made in the mixture, stir 3~5min, pouring vibration molding, and drying the molded green body at 110~150℃ for 12~36h to obtain alumina light castable.

[0018] Adopt the technical scheme described in this embodiment, obtain apparent porosity 29~33%, bulk density is 2.0~2.2g / cm 3 And aluminum oxide lightweight castables with a flexural strength of 3.0~4.2MPa. After being fired at 1550~1650℃, the holding time is 3~5h, and the apparent porosity is 28~36%, and the bulk den...

Embodiment 3

[0020] An alumina lightweight castable and a preparation method thereof. First with 85~87wt% α-Al 2 o 3 Fine powder and 13~15wt% ρ-Al 2 o 3 Micropowder is raw material, add the pseudoboehmite micropowder of described raw material 3~4wt% and the sillimanite of 6~8wt%, mix evenly, add the sodium hexametaphosphate of described raw material 0.2~0.3wt%, 0.2~ 0.3 sodium lignosulfonate and 23 ~ 27wt% water, mixed for 3 ~ 15min to prepare the mixture; then add the foam made by the foaming agent of the raw material 0.5 ~ 0.7wt% in the mixture, stir 3~5min, pouring vibration molding, and drying the molded green body at 110~150℃ for 12~36h to obtain alumina light castable.

[0021] Adopt the technical scheme described in this embodiment, obtain apparent porosity 33~37%, bulk density is 1.8~2.0g / cm 3 And aluminum oxide lightweight castables with a flexural strength of 1.8~3.0MPa. After firing at 1550~1650℃, the holding time is 3~5h, and the apparent porosity is 36~41%, and the bulk ...

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Abstract

The invention relates to a lightweight aluminum oxide castable and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps of: uniformly mixing 80wt%-90wt% of alpha-Al2O3 fine powder and 10wt%-20wt% of rho-Al2O3 micro-powder or 80wt%-90wt% of commercial alumina fine powder and 10wt%-20wt% of rho-Al2O3 micro-powder, 1wt%-5wt% of pseudo-boehmite micro-powder and 5wt%-10wt% of an expanding agent, which are taken as raw materials, and adding 0.1wt%-1wt% of a water reducer and 15wt%-30wt% of water into the mixture to mix for 3-15 minutes, thus obtaining a mixed material; adding foam prepared from 0.1wt%-1wt% of a foaming agent to the mixed material to stir for 3-5 minutes; and pouring and vibrating the mixed material for molding, and drying the mixed material at 110-150 DEG C for 12-36 hours to obtain the lightweight aluminum oxide castable. The lightweight aluminum oxide castable has the advantages of low production cost, simple process, energy conservation, environment protection, and easiness for large-scale production; and the lightweight aluminum oxide castable is high in porosity, small in mean aperture, high in refractoriness, high in high-temperature strength, low in thermal conductivity and high in resistance to steel slag erosion.

Description

technical field [0001] The invention belongs to the technical field of lightweight castables, and in particular relates to an alumina lightweight castable and a preparation method thereof. Background technique [0002] Energy saving and emission reduction is one of the important measures to maintain sustainable economic development. With the increasing demand for energy saving and emission reduction, the research on lightweight thermal insulation materials has attracted increasing attention. High-quality lightweight refractory products require good high-temperature performance, high strength at room temperature, low thermal conductivity and good thermal insulation performance, and thus put forward higher requirements for the preparation method of lightweight materials. In terms of lightweight heat-insulating castables, many scholars have developed vermiculite, perlite, ceramsite, ultra-light alumina and vitrified microbead castables. These lightweight castables have low ther...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B38/00C04B35/101C04B35/622
Inventor 赵雷陈辉王玺堂方伟陈欢李淑静雷中心龚仕顺
Owner WUHAN UNIV OF SCI & TECH
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