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Alumina light-weight brick and preparation method thereof

A lightweight brick and alumina technology, applied in the field of lightweight refractory materials, can solve the problems of high energy consumption, limited application range and high thermal conductivity of alumina hollow spheres, and achieve high strength, low bulk density and low thermal conductivity. Effect

Inactive Publication Date: 2010-05-19
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: (1) the scope of application of this method is limited; (2) the preparation of alumina hollow spheres consumes a lot of energy and high energy consumption; (3) the product has a large volume density and a high thermal conductivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] An alumina lightweight brick and a preparation method thereof. With 50~55wt% α-Al 2 o 3 Fine powder, 25~30wt% α-Al 2 o 3 Micropowder and 15-20wt% ρ-Al 2 o 3 Micro powder as raw material, plus 0.1~0.3wt% TiO 2 Micropowder, 30-35wt% water, 0.1-0.3wt% polycarboxylate water reducer and 0.1-0.5wt% silicon dioxide micropowder, mix for 3-5 minutes, then add 0.2-0.3wt% foaming agent ; Mix evenly, cast and mold, after drying, burn at 1450-1550°C and keep warm for 3-5 hours.

[0013] The bulk density of the alumina lightweight bricks prepared in Example 1 is 0.7 to 1.0 g / cm 3 , the thermal conductivity is 0.2~0.5w / (m.k), and the compressive strength reaches 5~15Mpa.

Embodiment 2

[0015] An alumina lightweight brick and a preparation method thereof. With 55~65wt% α-Al 2 o 3 Fine powder, 20~25wt% α-Al 2 o 3 Micropowder and 10-20wt% ρ-Al 2 o 3 Micropowder as raw material, add 0.3-0.5wt% MgO micropowder, 35-40wt% water, 0.1-0.3wt% lignin-based water reducing agent and 0.5-1wt% silica sol, mix for 3-5 minutes, and then add 0.3-0.4 wt% of the foaming agent is uniformly mixed, poured and molded, dried and fired at 1550-1600°C, and kept for 3-5 hours.

[0016] The bulk density of the alumina lightweight bricks prepared in Example 2 is 0.8 to 1.0 g / cm 3 , the thermal conductivity is 0.3~0.5w / (m.k), and the compressive strength reaches 6~15Mpa.

Embodiment 3

[0018] An alumina lightweight brick and a preparation method thereof. With 60~65wt% α-Al 2 o 3 Fine powder, 15~25wt% α-Al 2 o 3 Micropowder and 10-20wt% ρ-Al 2 o 3 Micro powder as raw material, plus 0.1~0.5wt% Cr 2 o 3 Micropowder, 40-45wt% of water, 0.1-0.5wt% of nano-based water reducer and 0.1-1wt% of nano-silica, mixed for 3-5 minutes, then added 0.3-0.4wt% of foaming agent, mixed evenly , pouring molding, drying at 1600 ~ 1650 ° C under the conditions of firing, heat preservation for 3 to 5 hours.

[0019] The bulk density of the alumina lightweight bricks prepared in Example 3 is 0.7 to 0.9 g / cm 3 , the thermal conductivity is 0.2~0.5w / (m.k), and the compressive strength reaches 6~12Mpa.

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Abstract

The invention relates to an alumina light-weight brick and a preparation method thereof. The method adopts the technical scheme that: 50 to 80 weight percent of Al2O3 fine powder, 15 to 30 weight percent of alpha-Al2O3 micro-powder and 5 to 20 weight percent of rho-Al2O3 micro-powder serving as raw materials are mixed with 0.1 to 1 weight percent of sintering aid, 30 to 50 weight percent of water, 0.1 to 1 weight percent of water reducer and 0.1 to 2 weight percent of SiO2 for 3 to 5 minutes; furthermore, the mixture and 0.2 to 0.4 weight percent of foaming agent are mixed uniformly, and are cast and molded; and the mold is sintered at the temperature of between 1,450 and 1,700 DEG C after being dried, and is insulated for 3 to 5 hours. The method has the characteristics of simple process and energy conservation; and the prepared alumina light-weight brick has the volume density of between 0.6 and 1.1g / cm3, the heat conductivity of between 0.2 and 0.6w / (m.k) and the compression strength of 5 to 15Mpa, and has the advantages of higher strength, small volume density and low heat conductivity compared with hollow ball products.

Description

technical field [0001] The invention belongs to the technical field of lightweight refractory materials, and in particular relates to an alumina lightweight brick and a preparation method thereof. Background technique [0002] Energy conservation is one of the important measures to maintain sustainable economic development. Thermal insulation is one of the important measures for energy saving. Therefore, thermal insulation materials with micro-nano pores play an important role in the field of thermal insulation. Thermal insulation materials refer to materials with high porosity, low bulk density and low thermal conductivity. In order to operate in various atmospheres (air, H 2 , N 2 and CO, etc.), to meet the high-temperature heat treatment process requirements of metals, non-metals and their products, and to reduce energy consumption, many scientific and technological personnel are committed to researching lightweight insulation materials used at high temperatures (1750-...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/101C04B35/64
Inventor 李远兵李晓星赵雷吴清顺李亚伟黄凯李绍康冯斌金胜利李淑静桑绍柏
Owner WUHAN UNIV OF SCI & TECH
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