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Aluminum oxide electric furnace cover pouring material and preparation method thereof

A technology of alumina and electric furnace cover, applied in the field of refractory materials, can solve the problems of thermal shock stability degradation, environmental hazards, and impact on durability, etc., to achieve enhanced slag erosion resistance, improved thermal shock resistance, and small thermal expansion coefficient Effect

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

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Problems solved by technology

Under high temperature conditions, Cr 2 o 3 It forms aluminum-chromium solid solution with corundum fine powder, and also reacts with other impurities to form chromium-containing glass phase, which is filled between chrome corundum crystals in the form of islands. This high-viscosity chromium-containing glass is very beneficial to prevent the penetration of slag. However, the too dense structure degrades the thermal shock stability and affects the durability, and the Cr 2 o 3 It is easy to vaporize and volatilize at high temperature, which is harmful to the environment

Method used

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  • Aluminum oxide electric furnace cover pouring material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A castable for alumina-based electric furnace cover and its preparation method: first, 50-60wt% of white corundum, 15-25wt% of high-alumina bauxite clinker, 15-25wt% of zirconium corundum, and 3-10wt% of blue crystal Stone fine powder, 1-8wt% alumina fine powder, 1-7wt% pure calcium aluminate cement, 1-3wt% silica-alumina gel, plus 0.10-0.25wt% sodium tripolyphosphate, 0.03-0.08wt% organic fiber, 5.0-6.5wt% water, stirred for 5-10min, poured into blocks, and naturally cured for 12-24h to demould, then dried at 110°C for 24h before assembly.

[0012] Among them: Al of white corundum 2 o 3 Al content ≥ 98.0wt%, particle size 0-15mm, high alumina bauxite clinker 2 o 3 Content ≥ 85.0wt%, particle size 0-25mm, zirconia corundum zirconia content 5-30wt%, particle size 0-1mm, kyanite fine powder Al 2 o 3 Al content ≥ 55.0wt%, particle size 0.15 ~ 0.074mm alumina micropowder 2 o 3 Content ≥ 98.0wt%, particle size 0-0.045mm, Al of pure calcium aluminate cement 2 o 3 Con...

Embodiment 2

[0014] A castable for alumina-based electric furnace cover and its preparation method: first, 60-70wt% of white corundum, 10-20wt% of high-alumina bauxite clinker, 5-20wt% of zirconium corundum, and 3-10wt% of blue crystal Stone fine powder, 5-12wt% alumina fine powder, 4-6wt% silica-alumina gel, plus 0.10-0.25wt% sodium tripolyphosphate and sodium hexametaphosphate, 0.03-0.08wt% Organic fiber, 5.0-6.5wt% water, stirred for 5-10 minutes, poured as a whole, naturally cured for 12-24 hours to demould, and then dried at 110°C for 24 hours.

[0015] Among them: Al of white corundum 2 o 3 Al content ≥ 98.0wt%, particle size 0-15mm, high alumina bauxite clinker 2 o 3 Content ≥ 85.0wt%, particle size 0-25mm, zirconia corundum zirconia content 5-30wt%, particle size 0-1mm, kyanite fine powder Al 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

[0017] A castable for alumina-based electric furnace cover and its preparation method: 60-80wt% of white corundum, 3-10wt% of high-alumina bauxite clinker, 8-20wt% of zirconium corundum, and 3-10wt% of kyanite Fine powder, 1-8wt% alumina fine powder, 1-7wt% pure calcium aluminate cement, 3-5wt% silica-alumina gel, plus 0.10-0.25wt% sodium hexametaphosphate, 0.03-0.08wt% organic fiber, 5.0-6.5wt% water, stirred for 5-10min, poured into blocks, and naturally cured for 12-24h to demould, then dried at 110°C for 24h before assembly.

[0018] Among them: Al of white corundum 2 o 3 Al content ≥ 98.0wt%, particle size 0-15mm, high alumina bauxite clinker 2 o 3 Content ≥ 85.0wt%, particle size 0-25mm, zirconia corundum zirconia content 5-30wt%, particle size 0-1mm, kyanite fine powder Al 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 pure calcium aluminate cement 2 o 3 Content ≥ 79.0wt...

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Abstract

The invention relates to a casting material of alumina eafroof and the preparation material thereof. The technic proposal is as following: 1. white corundum of 50-80wt percent, high alumina- bauxite clinker of 3-30wt percent, zirconium corundum of 5-25wt percent, kyanite fine powder of 3-15wt percent, alumina micro-powder of 3-12wt percent, pure aluminate calcium cement of 0-10wt percent and silicon-aluminum gel of 1-5wt percent are mixed together; 2. water reducing agent of 0.10-0.25wt percent, organic fiber of 0.03-0.08wt percent, and water of 5.0-6.5wt percent are then added to the obtained mixture and are stirred for 5-10 minutes, and the mixture is cast for molding; 3. the mold is naturally cured for 12-24 hours and then demolded; 4. the mold is dried for 24 hours under 110 DEG C. According to the size of furnace cover and application requiremenst, the casting molding is designed for whole casting molding or block pouring molding. The block molds are assembled thereafter. The invention is characterized by no environmental pollution, dense structure, good thermal and shock resistance and erosive resistance, and long service life.

Description

technical field [0001] The invention belongs to the field of refractory materials based on alumina raw materials, and in particular relates to an alumina castable for an electric furnace cover 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 furnace cover is eroded by the thermal radiation of the powerful high-temperature arc, frequent thermal shocks and high-temperature slag splashes, the working conditions are very harsh and the service life is low. The weak link of the entire steelmaking electric furnace often affects the production of electric furnace steelmaking due to maintenance and replacement of the furnace cover. With the development of electric furnace steelmaking technol...

Claims

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Application Information

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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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