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Aluminum-magnesium lightweight refractory material and preparation method thereof

A light-weight refractory material, aluminum-magnesium technology, applied in the field of light-weight refractory materials, can solve the problems of slag erosion resistance to be improved, matrix not dense enough, high apparent porosity, etc., to achieve strong erosion resistance, high activity, and obvious The effect of low porosity

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

However, the porous ceramic aggregate used in this invention still has the problems of large pore size (10 μm) and high apparent porosity (30-40%) to a certain extent, and the matrix is ​​not dense enough, and the slag erosion resistance still needs to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An aluminum-magnesium lightweight refractory material and a preparation method thereof. 60-75wt% microporous corundum particles are used as aggregate, 15-30wt% corundum fine powder, 6-10wt% magnesia micropowder and 4-7wt% α-alumina micropowder are used as base materials. Add the matrix material to the aggregate, add 5-6wt% of the binder of the sum of the matrix material and the aggregate, and stir evenly; then use a mixer to grind for 15-30 minutes, and then use a brick press to shape it; after forming The body is heat-treated at 100-140°C for 20-24 hours to make aluminum-magnesium lightweight refractory bricks.

[0029] In this embodiment, the preparation method of the microporous corundum particles is: use industrial alumina fine powder as raw material, add 40-50wt% water of the raw material, mix, wet-grind on a ball mill for 2-3 hours, wait until wet The abrasive slurry is solidified, kept at 110-160°C for 24-48 hours, and then kept at 1700-1820°C for 5-8 hours to o...

Embodiment 2

[0032] An aluminum-magnesium lightweight refractory material and a preparation method thereof. Except following aggregate and binding agent, all the other are the same as embodiment 1.

[0033] In this embodiment, the preparation method of the microporous corundum particles is: using 55-99wt% industrial alumina fine powder and 1-45wt% industrial aluminum hydroxide fine powder as raw materials, and then adding 70-80wt% of the raw materials % water, mixed, and wet milled on a ball mill for 0.5-1 hour. After the wet abrasive slurry is solidified, it is kept at 150-200°C for 12-24 hours, and then at 1780-1870°C for 1-3 hours. Microporous corundum particles were obtained.

[0034] The binding agent described in this embodiment is aluminum sol.

Embodiment 3

[0036] An aluminum-magnesium lightweight refractory material and a preparation method thereof. Except following aggregate and binding agent, all the other are the same as embodiment 1.

[0037] In this embodiment, the preparation method of the microporous corundum particles is: 55~99wt% industrial alumina fine powder and 1~45wt% α-Al 2 o 3Micropowder is used as the raw material, and 60~70wt% of the raw material is added to the water, mixed, and wet milled on a ball mill for 2~3 hours. After the wet abrasive slurry is solidified, it is kept at 150~200°C for 12~24 hours, and then heated at 1790 Microporous corundum particles were prepared by incubating at ~1900°C for 3 to 5 hours.

[0038] The binding agent described in this embodiment is water glass.

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PUM

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Abstract

The invention relates to an aluminum-magnesium lightweight refractory material and a preparation method thereof. The technical scheme comprises the following steps of: taking 60-85wt% of microporous corundum particles as an aggregate, taking 5-30wt% of fine corundum powder, and taking 2-10% of magnesium oxide micropowder and 4-9wt% of alpha-alumina micropowder as matrix materials; adding the matrix materials into the aggregate, additionally adding an adhesive which is 3-10wt% of the sum of the aggregate and the matrix materials, stirring uniformly and then mixing and milling for 15-30 minutes by a mixing mill, and molding by a brick pressing machine; and thermally processing the molded green body for 12-24 hours at 100-220 DEG C to obtain the aluminum-magnesium lightweight refractory material. The product prepared by the preparation method has the characteristics of small volume density, low apparent porosity, small average aperture, high refractoriness, large high-temperature strength, low thermal conductivity, good thermal shock resistance and strong capability resistant against the corrosion of media such as steel slag; and the prepared product is applicable to a working lining of a high-temperature industrial furnace.

Description

technical field [0001] The invention belongs to the technical field of lightweight refractory materials. In particular, it relates to an aluminum-magnesium light refractory material and a preparation method thereof. Background technique [0002] The ladle is an important equipment for storing, transporting and refining molten steel, and many new steel types are completed in the ladle. Its lining refractory material has been in contact with molten steel for a long time, and it has been subjected to frequent erosion by molten steel at high temperature for a long time, and corrosion of alloys and refining slag under vacuum, etc., resulting in a significant reduction in the service life of the refining ladle. In order to improve the slag erosion resistance of refractory materials, a group of dense refractory materials have been developed, such as traditional magnesia carbon bricks and magnesia aluminum spinel bricks. However, due to its structural characteristics, dense refra...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/101
Inventor 白晨顾华志黄奥张美杰邹阳
Owner WUHAN UNIV OF SCI & TECH
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