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Alumina electric furnace cover and preparation method thereof

A technology of alumina and electric furnace cover, which is applied in the field of refractory materials, can solve the problems of poor thermal shock stability, low service life, and molten iron slag erosion of high-alumina refractory materials, and achieve good spalling resistance and thermal shock stability High, good anti-scouring performance

Active Publication Date: 2015-02-18
北京利尔高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned patented technology has good anti-iron slag erosion performance in the steelmaking operation where the proportion of molten iron is low, but when the proportion of molten iron is high, because the molten iron slag is acidic It is an alkaline refractory material, so it is easily corroded by molten iron slag
In addition, high aluminum refractory materials have poor thermal shock stability and severe peeling during use, so the service life is not high under the condition of high ratio of molten iron

Method used

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  • Alumina electric furnace cover and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh each component according to the weight in the above table (unit is Kg), first fused white corundum fine powder, α-Al 2 o 3 Mix fine powder, silica fine powder and explosion-proof fiber evenly to make co-grinding powder; during production, add fused mullite particles and andalusite particles to the co-grinding powder, stir the mixture for at least 3 minutes and then add other remaining raw materials, Among them, the reinforced heat-resistant steel fibers should be evenly dispersed and added, and the premixed material should be obtained after stirring for at least 8 minutes;

[0028] Add 4.5Kg of water and 1.0Kg of water reducer ADS3 to the above premix, stir for 8 minutes, pour into the mold, remove the mold after natural curing, and dry.

[0029] Preferably, the mold is demoulded after 1 day of natural curing, and the curing is continued for 3 days after demoulding; when drying, the temperature at the kiln entrance is 60°C, the baking time is 92 hours, and the ma...

Embodiment 2

[0031] Weigh each component according to the weight (unit: Kg) ratio in the above table, first mix the fused white corundum fine powder, α-Al 2 o 3Mix fine powder, silica fine powder and explosion-proof fiber evenly to make co-grinding powder; during production, add fused mullite particles and andalusite particles to the co-grinding powder, stir the mixture for at least 3 minutes and then add other remaining raw materials, Among them, the reinforced heat-resistant steel fibers should be evenly dispersed and added, and the premixed material should be obtained after stirring for at least 8 minutes;

[0032] Add 5.5Kg of water and 0.8Kg of water reducer ADS3 to the above premix, stir for 15 minutes, pour into molding, demould and dry after natural curing.

[0033] Preferably, the mold is demoulded after 1 day of natural curing, and the curing is continued for 3 days after demoulding; when drying, the temperature at the kiln entrance is 50°C, the baking time is 100 hours, and the...

Embodiment 3

[0035] Weigh each component according to the weight (unit: Kg) ratio in the above table, first mix the fused white corundum fine powder, α-Al 2 o 3 Mix fine powder, silica fine powder and explosion-proof fiber evenly to make co-grinding powder; during production, add fused mullite particles and andalusite particles to the co-grinding powder, stir the mixture for at least 3 minutes and then add other remaining raw materials, Among them, the reinforced heat-resistant steel fibers should be evenly dispersed and added, and the premixed material should be obtained after stirring for at least 8 minutes;

[0036] Add 5.0Kg of water and 0.5Kg of water reducer ADS3 to the above premix, stir for 10 minutes, pour into molding, demould and dry after natural curing.

[0037] Preferably, the mold is demoulded after 1 day of natural curing, and the curing is continued for 3 days after demoulding; when drying, the temperature at the kiln entrance is 40°C, the baking time is 120 hours, and th...

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Abstract

The invention aims to provide an alumina electric furnace cover, which is high in thermal shock resistance, density and iron slag erosion resistance and long in service life. The alumina electric furnace cover comprises the following components in percentage by weight: 5 to 20 percent of 88 homogenized alumina particles, 8 to 35 percent of electrofused low-carbon brown aluminum oxide particles, 10 to 25 percent of electrofused mullite particles, 10 to 15 percent of andalusite particles, 10 to 15 percent of electrofused white corundum fine powder, 3 to 5 percent of alpha-Al2O3 micro powder, 2.5 to 7 percent of calcium aluminate cement, 1 to 2 percent of explosion-proof fibers, 2 to 4 percent of reinforced heat-resistant steel fibers, 2 to 4 percent of silicon dioxide micro powder and 2 to 5 percent of chromium oxide. A preparation method comprises the following steps of uniformly mixing the electrofused white corundum fine powder, the alpha-Al2O3 micro powder, the silicon dioxide micro powder and the explosion-proof fibers; adding the electrofused mullite particles and the andalusite particles, stirring the mixture for at least 3min, adding the other raw materials, and stirring the mixture for at least 8min; adding water and a water reducing agent, performing stirring and casting molding, and performing natural curing, de-molding and drying.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to an alumina electric furnace cover and a preparation method thereof. Background technique [0002] The steelmaking equipment commonly used in steelmaking production is the steelmaking electric arc furnace. The electric furnace cover is an important part of the steelmaking electric arc furnace. Corrosion is the weak link of steelmaking electric arc furnace. [0003] In the early steelmaking conditions, the steelmaking intensity was low and the smelting temperature was low, so silica bricks were often used as electric furnace covers. Silica bricks are light in weight, high in strength, good in thermal shock performance, and low in creep efficiency, and have been widely used; With the advancement of circuit steelmaking technology, the strength of steelmaking has increased, and the smelting temperature has increased, and silica bricks have gradually been replaced by high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 赵冉万小宝刘丽任林胡玲军刘全超王晓东刘美荣车晓梅
Owner 北京利尔高温材料股份有限公司
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