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A closed-cell alumina-based mullite material and its preparation method

A mullite and closed-cell technology, which is applied in the field of closed-cell bauxite-based mullite material and its preparation, can solve the problems of high preparation temperature, complicated process and high product price, and achieves high closed porosity and volume. The effect of low density and high temperature

Inactive Publication Date: 2019-11-05
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, closed-cell heat-insulating refractory materials mainly include alumina hollow spheres and zirconia hollow spheres, such as the invention patent "A Preparation Method for Alumina-based Corundum Hollow Spheres" (Patent No.: CN 101863672 A). Bauxite is used as the main raw material to smelt and store by electromelting, and to prepare alumina hollow spheres by blowing compressed air. The prepared alumina hollow spheres have the characteristics of high service temperature and good heat insulation performance. Large energy consumption, complex process, high product price, difficult to be widely used
The invention patent "Preparation method of zirconia hollow spheres" (Patent No. CN 102584279 A) uses zirconia as raw material and polystyrene as pore-forming agent. The invention adopts the method of adding a large amount of burning loss to prepare zirconia spheres with hollow structure. Easy to emit CO during calcination 2 cause environmental pollution

Method used

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  • A closed-cell alumina-based mullite material and its preparation method
  • A closed-cell alumina-based mullite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Mix 70wt% bauxite raw mineral powder and 30wt% siliceous raw material according to mass percentage, add the starch of the sum of the above-mentioned raw material mass percentages and 6wt% as additive, stir to obtain mixed mud; pour the mud Put it into a mold and shape it under a pressure of 100MPa to obtain a green body; bake the green body at a temperature of 120°C for 8 hours, and then put it into a high-temperature furnace and calcinate it at 1650-1680°C for 5 hours to obtain a closed-cell type. Alumina-based mullite material.

[0021] Al in the bauxite raw ore powder described in this embodiment 2 o 3 The mass percentage is 70-75wt%, and the particle size is ≤0.074mm; the silicon dioxide raw material is fused quartz, and the SiO2 in the raw material 2 Mass percentage content ≥ 98.0wt%, particle size: 0.01 ~ 0.1mm.

[0022] The technical indicators of the closed-cell alumina-based mullite material prepared in this example are: the closed porosity is 22% to 28%, an...

Embodiment 2

[0024] Mix 60wt% bauxite raw mineral powder and 40wt% siliceous raw material uniformly by mass percentage, add polyethylene glycol of the sum of the above-mentioned raw material mass percentages and 4wt% as an additive, and stir to obtain a mixed sludge; Pour the mud into the mold and shape it under a pressure of 120MPa to obtain a green body; bake the green body at a temperature of 120°C for 6 hours, and then put it into a high-temperature furnace for calcination at a temperature of 1550-1600°C for 6 hours to obtain Closed-cell alumina-based mullite material.

[0025] Al in the bauxite raw ore powder described in this embodiment 2 o 3 The mass percentage is 75-80wt%, and the particle size is ≤0.074mm; the silicon dioxide raw material is waste silica brick, and the SiO2 in the raw material 2 Mass percentage content ≥ 94.0wt%, particle size: 0.02 ~ 0.15mm.

[0026] The technical indicators of the closed-cell alumina-based mullite material prepared in this example are: the cl...

Embodiment 3

[0028] Mix 68wt% bauxite raw mineral powder and 32wt% siliceous raw material according to mass percentage, add the sum of 4wt% dextrin of above-mentioned raw material mass percentage as additive, stir to obtain mixed mud; mud Pour it into a mold and shape it under a pressure of 100MPa to obtain a green body; bake the green body at a temperature of 110°C for 10 hours, and then put it into a high-temperature furnace and calcinate it at 1580-1620°C for 3 hours to obtain a closed cell. Alumina-based mullite material.

[0029] Al in the bauxite raw ore powder described in this embodiment 2 o 3 The mass percentage is 55-60wt%, and the particle size is ≤0.074mm; the silicon dioxide raw material is waste silica brick, and the SiO2 in the raw material 2 Mass percentage content ≥ 94.0wt%, particle size: 0.02 ~ 0.2mm. The technical indicators of the closed-cell alumina-based mullite material prepared in this example are: the closed porosity is 25% to 32%, and the bulk density is 1.8 t...

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Abstract

The invention relates to a closed-pore bauxite based mullite material and a preparing method thereof. According to the technical scheme, by mass, 40-95wt% of bauxite rawore powder and 5-60wt% of silicon dioxide material are mixed uniformly, an additive accounting for 3-10wt% of the raw material mass is added externally and stirred uniformly to obtain a mixture, the mixture is poured into a mold and formed under the pressure of 80-150 MPa to obtain a blank, and the blank is fired for 2-12 h at the temperature of 80-160 DEG C, then put into a high-temperature furnace and calcined for 3-18 h at the temperature of 1450-1750 DEG C in the high-temperature furnace to obtain the closed-pore bauxite based mullite material. The preparing method is low in production cost and saves resources and energy, and the obtained closed-pore bauxite based mullite material is high in closed porosity, small in volume density and large in compression strength.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and relates to a preparation method of novel porous ceramics or porous refractory materials, in particular to a closed-cell alumina-based mullite material and a preparation method thereof. [0002] technical background [0003] With the continuous improvement of environmental protection awareness, energy-saving materials have become an important direction of new materials. In order to further reduce emissions in high-temperature industries, a large number of heat-insulating refractory materials have begun to be used. At present, the vast majority of thermal insulation refractory materials are used in the lower temperature insulation layer, and cannot be used directly in the working layer in contact with the high temperature melt. The main reason is that the heat insulation material produced has high opening porosity, low load softening temperature and poor corrosion resis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/185C04B38/06
CPCC04B35/185C04B35/66C04B38/06C04B2235/3217C04B2235/3418C04B2235/77C04B2235/96C04B38/0067C04B38/0061
Inventor 赵飞葛铁柱叶国田陈留刚任桢
Owner ZHENGZHOU UNIV
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