Corundum aggregate with micro-nano-pore structure and preparation method of corundum aggregate

A technology of micro-nano holes and corundum bone, which is applied in the field of corundum aggregates, can solve the problems of energy consumption, difficulty in ensuring crack stability, and raising material prices, so as to achieve energy saving and environmental protection in production costs, improve thermal stability, and improve production technology. simple effect

Active Publication Date: 2013-08-21
浙江自立新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) The corundum hollow spheres Al 2 o 3 Content is not high
(2) Smelting and purifying in three-phase AC arc submerged arc furnace or DC arc submerged arc furnace, the temperature of desiliconization is high, which consumes a lot of energy
The disadvantages of this method are: (1) Martensitic transformation occurs during the heating process, resulting in microcracks, but the stability of the size and number of cracks is difficult to be guaranteed
(2) The price of zirconium-containing raw materials is expensive, which increases the cost of production and increases the price of materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A corundum aggregate with a micro-nano pore structure and a preparation method thereof. With 60~64wt% α-Al 2 o 3 Fine powder, 13~15wt% α-Al 2 o 3 Micropowder, 10~15wt% ρ-Al 2 o 3 Micropowder and 12-15wt% sillimanite are raw materials, and then 5-7.5wt% foam, 32-35wt% water and 0.5-1.0wt% titanium dioxide are added to the raw materials, and mixed uniformly to make a spherical green body; Dry naturally, bake, heat up to 1750°C~1780°C, and keep warm for 2.0~2.5 hours to obtain corundum aggregate with micro-nanoporous structure.

[0020] The corundum aggregate with micro-nanoporous structure prepared in this example has a bulk density of 2.93~3.08g / cm 3 , normal temperature compressive strength 38.1~42.4MPa, apparent porosity 14.3~16.9%, 1100 ℃ thermal shock (water cooling) 29 fractures.

Embodiment 2

[0022] A corundum aggregate with a micro-nano pore structure and a preparation method thereof. With 63~67wt% α-Al 2 o 3 Fine powder, 12~14wt% α-Al 2 o 3 Micropowder, 9~14wt% ρ-Al 2 o 3 Micropowder and 11-14wt% sillimanite are raw materials, and then 7.5-10wt% foam, 30-32wt% water and 1.0-2.0wt% titanium dioxide are added to the raw materials, and mixed uniformly to make a spherical green body; Dry, bake, heat up to 1710°C~1750°C, and keep warm for 2.2~2.8 hours to obtain corundum aggregate with micro-nanoporous structure.

[0023] The corundum aggregate with micro-nanoporous structure prepared in this example has a bulk density of 2.71~2.93g / cm 3 , normal temperature compressive strength 30.7~38.1MPa, apparent porosity 16.9~18.3%, 1100 ℃ thermal shock (water cooling) 30 fractures.

Embodiment 3

[0025] A corundum aggregate with a micro-nano pore structure and a preparation method thereof. With 67~70wt% α-Al 2 o 3 Fine powder, 11~13wt% α-Al 2 o 3 Micropowder, 8~13wt% ρ-Al 2 o 3 Micropowder and 10-13wt% sillimanite are raw materials, and then add 10-20wt% foam of the raw materials, 25-30wt% water, 0.5-1.0wt% titanium dioxide and 0.5-0.7wt% silicon micropowder, and mix Uniform, made into a spherical green body; naturally dried, baked, heated to 1680 ° C ~ 1710 ° C, and kept for 2.4 ~ 3.0 hours to obtain a corundum aggregate with a micro-nano porous structure.

[0026] The corundum aggregate with micro-nanoporous structure prepared in this example has a bulk density of 2.32~2.71g / cm 3 , normal temperature compressive strength 26.2~30.7MPa, apparent porosity 18.3~20.5%, 1100 ℃ thermal shock (water cooling) 30 times without breaking.

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Abstract

The invention particularly relates to a corundum aggregate with a micro-nano-pore structure and a preparation method of the corundum aggregate. According to the technical scheme, the preparation method comprises the following steps of: with 60-82 wt% of alpha-Al2O3 fine powder, 6-15 wt% of alpha-Al2O3 micro powder, 3-15 wt% of rho-Al2O3 fine powder and 5-15 wt% of sillimanite as raw materials, adding 5-50 wt% of foam, 8-35 wt% of water and 0.5-2.5 wt% of burning accelerant in terms of the raw materials, and uniformly mixing to prepare a spherical biscuit; and naturally drying, roasting, heating to 1600-1780 DEG C, and insulating heat for 2-4 hours to obtain the corundum aggregate with the micro-nano-pore structure. The corundum aggregate with the micro-nano-pore structure and the preparation method disclosed by the invention have the advantages of being simple in production process, low in production cost, and energy-saving and environment-friendly; and the prepared corundum aggregate with the micro-nano-pore structure is good in thermal shock resistance, wide in application range, and capable of being used as a lining material for a kiln or a refractory castable for a heavy working layer during steel-making.

Description

technical field [0001] The invention belongs to the technical field of corundum aggregates, and in particular relates to a corundum aggregate with a micro-nano pore structure and a preparation method thereof. Background technique [0002] Among the existing heat insulation materials, alumina heat insulation materials occupy a dominant position. Alumina hollow balls are evolved from foamed alumina products. The original foamed alumina products have low strength, poor high temperature creep, and oxidized Although the aluminum hollow sphere improves these shortcomings, its production process is complicated and the production cost is high. Therefore, alumina heat insulation materials still need more comprehensive improvement. Although corundum-based refractory castables have good anti-scouring and anti-erosion capabilities, their dense structure leads to poor thermal shock stability, easily causing spalling, and greatly reducing the service life of castables. Therefore, improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/08C04B35/10
Inventor 赵雷陈欢王鑫陈辉杜星李远兵
Owner 浙江自立新材料股份有限公司
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