Alumina-base fused high-purity spinel and its prepn

A spinel and electrofusion technology is applied in the field of bauxite-based electrofusion high-purity spinel materials and their preparation, and can solve the problems of poor density of synthetic materials and the like

Inactive Publication Date: 2006-05-17
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The raw material needs to be pure oxide, and the density of the synthetic material after firing is worse than that of the electrofusion synthetic material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Raw material: high alumina bauxite Composition: Al 2 o 3 86.91%, SiO 2 5.23%, TiO 2 4.31%, particle size 10mm-30mm; light burnt magnesia: MgO content 95.3%, CaO 1.3%, SiO 2 1.0%, the particle size is 1-5mm; graphite fixed C is 85%, the particle size is 1-5mm; iron filings: Fe content is 76%, the length is 10-200mm.

[0025] Preparation:

[0026] Mix 10 tons of high alumina bauxite, 0.8 tons of graphite, and 1.0 tons of iron filings evenly, use part of the mixture to spread the bottom of the electric arc furnace, and start the arc at a voltage of 150V. Then add the mixture in batches for smelting. After 3 hours, the voltage is adjusted to 115V, and the reduction smelting is performed at a high temperature of about 2100°C to remove silicon dioxide, titanium dioxide and impurities in the alumina, so that the Al in the corundum melt 2 o 3 The content is greater than 98%. Observe the smelting quality at this stage by dipping a stick.

[0027] Control the voltage of t...

Embodiment 2

[0031] Raw material: High alumina bauxite Composition after ignition: Al 2 o 3 85.52%, SiO 2 5.44%, TiO 2 4.51%, particle size 10mm-30mm; light burnt magnesia: MgO content 95.3%, CaO 1.3%, SiO 2 1.0%, the particle size is 1-5mm; the fixed C of coke particles is 80%, the particle size is 1-5mm; iron filings: the Fe content is 80%, and the length is 10-200mm.

[0032] Preparation:

[0033] Mix 10 tons of high alumina bauxite, 0.95 tons of coke particles, and 1.15 tons of iron filings evenly. Use this mixture to lay the bottom of the furnace, and start the arc with a voltage of 145V. Then add the mixture in batches for smelting, adjust the voltage to 115V after 3 hours, and reduce the smelting at a temperature of about 2050°C to remove silicon dioxide, titanium dioxide and impurities in the alumina, so that Al in the corundum melt 2 o 3 The content is greater than 98%. Observe the smelting quality at this stage by dipping a stick.

[0034] Control the voltage of the elec...

Embodiment 3

[0038] Raw material: High alumina bauxite Composition after ignition: Al 2 o 3 89.63%, SiO 2 3.91%, TiO 2 4.25%, particle size 10mm-30mm; light burnt magnesia: MgO content 95.3%, CaO 1.3%, SiO 2 1.0%, the particle size is 1-5mm; the fixed C of coke particles is 80%, the particle size is 1-5mm; iron filings: the Fe content is 84%, and the length is 10-200mm.

[0039] Preparation:

[0040] Mix 10 tons of high alumina bauxite, 0.9 tons of coke particles, and 1.1 tons of iron filings evenly. Use this mixture to lay the bottom of the furnace, and start the arc with a voltage of 140V. Then add the mixture in batches for smelting. After 3 hours, the voltage is adjusted to 110V, and the reduction smelting is performed at a high temperature of about 2200°C to remove silicon dioxide, titanium dioxide and impurities in the alumina, so that the Al in the corundum melt 2 o 3The content is greater than 98%. Observe the smelting quality at this stage by dipping a stick.

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Abstract

The present invention provides alumina-base fused high-purity spinel and its preparation process. The alumina-base fused high-purity spinel is prepared with light burned high-aluminum alumina and light burned magnesite as main material and granular coke or graphite and iron filings as supplementary material, and through reducing smelting, oxidizing smelting and refining. It has lowered cost, excellent performance, spinel phase and bulk density greater than 3.4, and contains Al2O3+MgO >97 wt%, MgO 21-32 wt% and SiO2 <1 wt%. It is used widely as high temperature functional material in high temperature industry, especially steel ladle material.

Description

[0001] Field [0002] The invention belongs to the technical field of manufacturing ceramic molding products characterized by components, and in particular relates to an alumina-based electro-fused high-purity spinel material prepared by a melting casting method and a preparation method thereof. Background technique [0003] With the development of continuous casting and refining technology outside the furnace, part of the refining process is transferred from the steelmaking furnace to the ladle. The ladle is not only a high-temperature container for storing molten steel, but also for refining molten steel in a vacuum, becoming a unique metallurgical equipment. Due to the increase of molten steel temperature, the prolongation of the residence time of molten steel in the ladle, coupled with the stirring action of the refining process and the erosion of slag, the service conditions of the ladle lining are deteriorated and the service life is reduced. At present, the ladle linin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/443
Inventor 钟香崇葛铁柱梁耀华叶方保
Owner ZHENGZHOU UNIV
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