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Electric furnace top central area furnace cover and preparation method thereof

A central area and electric furnace technology, which is applied in the field of the central area furnace cover of the electric furnace top and its preparation, can solve the problems of shortening the service life of the electric furnace cover and increasing the oxygen blowing intensity.

Inactive Publication Date: 2015-03-11
北京利尔高温材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention proposes a furnace cover in the central area of ​​the electric furnace roof and its preparation method, which solves the technical problems that the existing electric furnace has continuously increased the proportion of molten steel for smelting, and the oxygen blowing intensity has increased, resulting in a decrease in the life of the electric furnace cover.

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  • Electric furnace top central area furnace cover and preparation method thereof
  • Electric furnace top central area furnace cover and preparation method thereof

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Embodiment 1

[0023] A furnace cover in the central area of ​​the electric furnace roof according to Embodiment 1 of the present invention includes the following components in weight percentage: 10% 88 homogenized alumina particles, the particle size is 15-8mm, and the chemical composition percentage is: Al 2 o 3 ≥88.0, Fe 2 o 3 ≤1.55,TiO 2 : 2.0~4.0, SiO 2 : 5.0~6.5; fused low-carbon brown corundum has two particle sizes: 8~5mm and 5~3mm; fused low-carbon brown corundum with a particle size of 8~5mm has a weight ratio of 12% and a particle size of 5 The weight ratio of ~3mm fused low-carbon brown corundum is 16%, and the mass percentages of its chemical components are: Al 2 o 3 ≥96.0, TiO 2 : 2.0~2.3, SiO 2 ≤0.8, Fe 2 o 3 ≤0.1,Na 2 O+K 2 O ≤ 0.2, pulverization rate ≤ 0.01%; 12% fused mullite particles, the particle size is 3 ~ 1mm, and the mass percentage of its chemical components are: Al 2 o 3 ≥70.0, SiO 2 : 22~24.5, Fe 2 o 3 ≤0.5; 15% andalusite particles, the particle s...

Embodiment 2

[0025] A furnace cover in the central area of ​​the electric furnace roof according to Embodiment 2 of the present invention comprises the following components in weight percent: 10% 88 homogenized bauxite particles, the particle size of which is 15-8 mm, and the chemical composition percentage is: Al 2 o 3 ≥88.0, Fe 2 o 3≤1.55,TiO 2 : 2.0~4.0, SiO 2 : 5.0 ~ 6.5; 25% fused low carbon brown corundum, there are two kinds of particle size: 8 ~ 5mm and 5 ~ 3mm; the mass percentage of its chemical components are: Al 2 o 3 ≥96.0, TiO 2 : 2.0~2.3, SiO 2 ≤0.8, Fe 2 o 3 ≤0.1,Na 2 O+K 2 O ≤ 0.2, pulverization rate ≤ 0.01%; 15% fused mullite particles, the particle size is 3 ~ 1mm, and the mass percentage of its chemical components are: Al 2 o 3 ≥70.0, SiO 2 : 22~24.5, Fe 2 o 3 ≤0.5; 15% andalusite particles, the particle size is 1-0mm; the mass percentages of its chemical components are: Al 2 o 3 ≥58.5, SiO 2 : 38~40.0, TiO 2 ≤0.4, Fe 2 o 3 ≤1.0; 15% fused white cor...

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Abstract

The invention provides an electric furnace top central area furnace cover and a preparation method thereof, the electric furnace top central area furnace cover comprises the following components by weight: 50-60% of aggregate, 25.6-27.6% co-ground powder, 5% of calcium aluminate cement and 2.5% of steel fiber. During the preparation, the co-ground powder and bone powder particles are mixed for 3 minutes, then the calcium aluminate cement and steel fiber are added for mixing for 8-10 minutes, and the premix is discharged; 5%-5.3% of water is added into the premix for stirring for about 3 minutes, after pre vibrating for 1 minute, the mixture is added into a mold, a lower vibration table is used to ensure sufficient air exhaust and smooth surface; thereafter, room temperature curing is performed for 1 day, then demoulding is performed, after demoulding, the curing is continued for 3 days; after baking, inspection, packaging and storage are performed. The electric furnace top central area furnace cover has good molten iron, molten iron slag and molten steel slag erosion resistance, has good thermal shock stability and high temperature sintering performance, and can reduce spalling and melting corrosion damage in the course of use.

Description

technical field [0001] The invention relates to the technology of refractory materials in the central area of ​​the electric furnace top, in particular to a furnace cover in the central area of ​​the electric furnace top and a preparation method thereof. Background technique [0002] From the 1950s to the 1970s, the refractory materials in the central area of ​​the electric furnace roof were mainly built with silica bricks. Under the conditions of early electric furnace steelmaking, silica bricks had many advantages, such as light weight and high strength, low creep rate, and thermal shock. With good stability and low price, it has been widely used stably. With the continuous advancement of electric furnace steelmaking technology, the strength of electric furnace steelmaking has increased, and the smelting temperature has continued to rise. The original silica bricks can no longer meet the needs of actual conditions. A series of high-alumina refractory bricks or refractory ...

Claims

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Application Information

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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