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High-alumina electric furnace cover pouring material and preparation method thereof

A technology of electric furnace cover and castable, which is applied in the field of refractory materials, can solve the problems of poor corrosion resistance, peeling off blocks, poor thermal shock stability, etc., and achieves corrosion resistance that is difficult to penetrate, good use effect, and good thermal shock resistance. Effect

Inactive Publication Date: 2008-01-30
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In use, because periclase and wurstite (FeO) form a continuous solid solution, MgO bricks and MgO-Gr 2 o 3 Bricks have good resistance to alkaline slag containing iron oxide and calcium oxide, but magnesia materials have a large thermal expansion coefficient, high elastic modulus, poor thermal shock stability, and the slag moves toward the periclase grains during use. Penetration, which in turn causes its structure to peel off
In contrast, corundum materials have good high temperature resistance and thermal shock resistance, but pure corundum materials have poor corrosion resistance during use, and the phenomenon of peeling off during use is serious
There are also domestic manufacturers who have produced high-quality high-alumina bricks (CN 86103155), but it is still difficult to meet the harsh requirements of electric furnace intensified smelting

Method used

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  • High-alumina electric furnace cover pouring material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] A high-aluminum electric furnace cover castable and a preparation method thereof. First mix 75-80wt% high alumina bauxite clinker, 5-10wt% kyanite fine powder, 3-8wt% alumina fine powder, 1-5wt% aluminate cement, 2-4wt% silicon Aluminum gel is mixed, plus 0.18-0.20wt% sodium tripolyphosphate and 5.0-6.0wt% water of the above-mentioned mixture, stirred for 5-6min, and poured into blocks. Naturally cured for 12-24 hours to remove the mold, and then dried at 110°C for 24 hours before assembling.

[0011] Among them: Al of high alumina bauxite clinker 2 o 3 Al content ≥ 85.0wt%, particle size 0-25mm, kyanite fine powder 2 o 3 Al content ≥ 55.0wt%, particle size 0.15 ~ 0.074 mm, aluminum oxide powder Al 2 o 3 Content ≥ 98.0wt%, particle size 0-0.045mm, Al of aluminate cement 2 o 3 Content ≥ 60.0wt%, particle size 0-0.15mm.

Embodiment 2

[0013] A high-aluminum electric furnace cover castable and a preparation method thereof. First mix 80-90wt% high-alumina bauxite clinker, 3-10wt% kyanite fine powder, 2-7wt% alumina fine powder, 3-5wt% silica-alumina gel, and add the above-mentioned mixture 0.18 -0.20wt% sodium tripolyphosphate and sodium hexametaphosphate, 5.0-6.0wt% water, stirred for 5-6 minutes, and integrally casted. Naturally cured for 12-24 hours to demould, and then dried at 110°C for 24 hours.

[0014] Among them: Al of high alumina bauxite clinker 2 o 3 Al content ≥ 85.0wt%, particle size 0-25mm, kyanite fine powder 2 o 3 Al content ≥ 55.0wt%, particle size 0.15 ~ 0.074mm, aluminum oxide powder Al 2 o 3 Content ≥ 98.0wt%, particle size 0-0.045mm.

Embodiment 3

[0016] A high-aluminum electric furnace cover castable and a preparation method thereof. First mix 80-85wt% high alumina bauxite clinker, 3-8wt% kyanite fine powder, 3-8wt% alumina fine powder, 1-5wt% aluminate cement, 1-3wt% silicon Aluminum gel is mixed, plus 0.18-0.20wt% sodium hexametaphosphate and 5.0-6.0wt% water of the above-mentioned mixture, stirred for 5-6min, and poured in blocks. Naturally cured for 12-24 hours to remove the mold, and then dried at 110°C for 24 hours before assembling.

[0017] Among them: Al of high alumina bauxite clinker 2 o 3 Al content ≥ 85.0wt%, particle size 0-25mm, kyanite fine powder 2 o 3 Al content ≥ 55.0wt%, particle size 0.15 ~ 0.074mm, aluminum oxide powder Al 2 o 3 Content ≥ 98.0wt%, particle size 0-0.045mm, Al of aluminate cement 2 o 3 Content ≥ 60.0wt%, particle size 0-0.15mm.

[0018] The physical and chemical indicators of the product prepared in this specific embodiment are: apparent porosity at 110°C×24h 11.2-12.8%, 15...

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Abstract

The invention relates to a castable material of high aluminum electric stove and a preparation method thereof. The technic proposal is that: 75-90wt% high aluminum bauxite clinker, 3-15wt% fine poder kyanite, 1-10wt% micro-powder aluminum oxide, 0-10wt% aluminate cement, 1-5wt% alumino silica gel are firstly mixed, and 0.10-0.25wt% water reducer of the mixture and 5.0-6.5% water are added into the mixture, and the mixture is stirred for 5-10min to be casted into a mold, and the mold is naturally conserved for 12-24h and demould, and is dried in 110 DEG C for 24h. The casting mold is either entire-cast or deblocking-cast, and finally the molds are assembled. The invention adopts high aluminum bauxite clinker as base, and the prepared products has the advantages of good thermal shock resistance, high density, which is difficult for splashing substances of high temperature cinder to penetrate, and has excellent erosion resistance as well as long service life.

Description

technical field [0001] The invention belongs to the field of refractory materials based on high alumina bauxite clinker. In particular, it relates to a high-aluminum electric furnace cover castable and a preparation method thereof. Background technique [0002] Electric furnace steelmaking is one of the main steelmaking production processes, and steelmaking electric arc furnace is the main steelmaking equipment. The electric furnace cover is an important part of the steelmaking electric arc furnace. Because the refractory material of the electric furnace cover is eroded by strong thermal radiation, frequent thermal shocks and high-temperature slag splashes, the service life is low, and it is the weak link of the entire steelmaking electric furnace. The electric furnace steelmaking production is often affected due to maintenance and replacement of the furnace cover. With the development of electric furnace steelmaking technology, the proportion of high-power and ultra-high-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 祝洪喜邓承继白晨葛山彭胜堂刘奎然刘红阳
Owner WUHAN UNIV OF SCI & TECH
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