Alumina-magnesia refractory brick containing light porous aggregate and its making process

A porous aggregate and refractory brick technology, applied in the field of refractory materials, can solve the problems of energy consumption, impact on service life, waste, etc., and achieve good slag erosion resistance, good thermal insulation performance, good erosion and erosion effects

Inactive Publication Date: 2007-11-07
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, traditional lightweight insulation materials such as diatomite bricks, asbestos bricks, vermiculite bricks, lightweight clay bricks, lightweight mullite and lightweight corundum bricks cannot be used in parts that are in direct contact with liquid or other media.
Because it is susceptible to erosion and erosion of the working medium (Xu Pingkun, Dong Yingbang. Corundum refractories. Beijing: Metallurgical Industry Press, 1999; Wang Weibang. Refractory Technology. Beijing: Metallurgical Industry Press, 1994), affecting the service life, even Affect the safe production of high temperature kiln or container
On the other hand, in trad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] An aluminum-magnesium refractory brick containing lightweight porous aggregate and its preparation method: lightweight porous corundum (Al 2 o 3 content ≥ 97wt%), light porous corundum (Al 2 o 3 Corundum fine powder (Al 2 o 3 content≥95wt%), magnesia fine powder (MgO content≥95wt%) and α-Al with particle size2 o 3 Micropowder (Al 2 o 3 Content ≥ 97wt%) are mixed according to 30-35wt%, 25-30wt%, 20-25wt%, 5-6wt% and 8-10wt% respectively; wherein, the apparent porosity of lightweight porous corundum is greater than 20%, and the average pore diameter is less than 30 μm. Add 3-5wt% pulp waste liquid of the above-mentioned mixture as a binder, stir evenly, and then machine-press molding at a molding pressure of 120-150Mpa, and dry the molded green body at 120-140°C for 12-24 hours. Apparent porosity of 32-35%, bulk density of 2.45-2.50g / cm can be obtained 3 , Aluminum-magnesium unburned refractory bricks containing lightweight aggregates with a flexural strength of ...

Embodiment 2

[0015] An aluminum-magnesium refractory brick containing lightweight porous aggregate and its preparation method: light porous corundum-spinel (MgO content is 10wt%) with a particle size of 5-3mm, and a particle size of 3-1mm Light porous corundum-spinel (MgO content is 10wt%), corundum (Al 2 o 3 content ≥ 95wt%), magnesia fine powder (MgO content ≥ 95wt%), spinel fine powder (Al 2 o 3 α-Al with a content of 90 wt%) and a particle size 2 o 3 Micropowder (Al 2 o 3 content ≥ 97wt%) are mixed at 15-20wt%, 15-20wt%, 30-35wt%, 5-6wt%, 20-25wt%, and 3-5wt% respectively; wherein, the light porous corundum-spinel The apparent porosity is greater than 20%, and the average pore diameter is less than 30 μm. Add 3-5wt% pulp waste liquid of the above-mentioned mixture as a binder, stir it evenly, and press it to form it. The obtained apparent porosity is 30-35%, and the bulk density is 2.50-2.60g / cm 3 , Aluminum-magnesium unburned refractory bricks containing lightweight aggregates...

Embodiment 3

[0017] A refractory brick containing lightweight porous aggregate and its preparation method: light porous spinel with a particle size of 5-3mm (MgO content is 12wt%), light porous spinel with a particle size of 3-1mm Stone (MgO content is 40wt%), spinel (Al 2 o 3 content is 90wt%), magnesia fine powder (MgO content ≥ 95wt%), corundum fine powder (Al 2 o 3 α-Al with content≥95wt%) and particle size2 o 3 Micropowder (Al 2 o 3 Content ≥ 97wt%) are mixed according to 15~20wt%, 25~30wt%, 25~30wt%, 5~6wt%, 20~25wt% and 3~5wt% respectively; Among them, the apparent porosity of light porous spinel Both are greater than 20%, and the average pore diameter is less than 30 μm. Add 3-5wt% of the pulp waste liquid of the above-mentioned mixture as a binder, stir it evenly, and press it to form it. The apparent porosity is 28-32%, and the volume density is 2.55-2.65g / cm 3 , Aluminum-magnesium unburned refractory bricks containing lightweight aggregates with a flexural strength of 6....

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Abstract

The present invention relates to one kind of alumina-magnesia refractory brick containing light porous aggregate and its production process. The technological scheme is that the alumina-silica refractory brick is produced with light porous Al2O3-MgO refractory material 30-70 wt%, compact Al2O3-MgO refractory material 0-35 wt%, fine magnesia powder 5-30 wt%, fine alpha-Al2O3 powder 3-10 wt%, fine corundum powder 0-25 wt% and fine spinel powder 0-25 wt%, and through mixture, adding waste pulp liquid in 3-7 wt% as binding agent, stirring, pressing to form adobe, drying at 100-150 deg.c for 12-48 hr, sintering at 1400-1600 deg.c for 2-5 hr and naturally cooling. The alumina-magnesia refractory brick has high macro porosity, small average pore size, low heat conductivity and high medium erosion resistance, and may be used in the permanent layer or work layer in high temperature kiln, furnace and container.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to an aluminum-magnesia refractory brick containing lightweight porous aggregate and a preparation method thereof. Background technique [0002] With the world's increasing requirements for reducing energy consumption and saving energy, the requirements for lightweight insulation materials are increasing. However, traditional lightweight insulation materials such as diatomite bricks, asbestos bricks, vermiculite bricks, lightweight clay bricks, lightweight mullite and lightweight corundum bricks cannot be used in parts that are in direct contact with liquid or other media. Because it is susceptible to erosion and erosion of the working medium (Xu Pingkun, Dong Yingbang. Corundum refractories. Beijing: Metallurgical Industry Press, 1999; Wang Weibang. Refractory Technology. Beijing: Metallurgical Industry Press, 1994), affecting the service life, even Affec...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/443C04B35/101C04B35/043C04B35/622
Inventor 李楠彭从华
Owner WUHAN UNIV OF SCI & TECH
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