Electric furnace cover castable with aluminum-chromium slag being main material and preparation method thereof

A technology of aluminum chrome slag and castables, which is applied in the field of electric furnace cover castables and its preparation, can solve the problems of increasing the development cost of refractory materials for electric furnace cover, high cost of refractory raw materials, and material cracking, so as to save labor resources, Effect of improving thermal shock stability and reducing specific gravity

Active Publication Date: 2017-02-22
锦州集信高温材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the secondary spinelization of magnesia-alumina spinel at high temperature can easily cause volume expansion, resulting in cracking or even damage to the material; in addition, the cost of refractory raw materials such as magnesia-alumina spinel is high, which increases the number of refractory materials used in electric furnace covers. development cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] An electric furnace cover castable with aluminum chromium slag as the main material and a preparation method thereof. The preparation method described in this embodiment is:

[0034] With 10~12wt% zirconium corundum particles and 50~52wt% aluminum chromium slag particles as aggregate, 16~18wt% aluminum chromium slag fine powder, 6~8wt% Cr 7 C 3 Fine powder, 13~15wt% ρ-Al 2 o 3 Micropowder and 2~4wt% yttrium oxide micropowder are base materials; according to the content of the aggregate and the base material, first mix the base material, then add the mixed base material into the aggregate, mix uniform; then add aluminum sol accounting for 15~18wt% of the sum of the base material and the aggregate, stir evenly, vibrate and form, maintain at room temperature for 6~12 hours, and finally keep warm at 90~110°C for 12~ After 24 hours, the electric furnace cover castable with aluminum chromium slag as the main material was prepared.

[0035] The electric furnace cover castab...

Embodiment 2

[0037] An electric furnace cover castable with aluminum chromium slag as the main material and a preparation method thereof. The preparation method described in this embodiment is:

[0038] With 11~13wt% zirconium corundum particles and 51~53wt% aluminum chromium slag particles as aggregate, 15~17wt% aluminum chromium slag fine powder, 6~8wt% Cr 7 C 3 Fine powder, 12~14wt% ρ-Al 2 o 3 Micropowder and 2~4wt% yttrium oxide micropowder are base materials; according to the content of the aggregate and the base material, first mix the base material, then add the mixed base material into the aggregate, mix uniform; then add aluminum sol accounting for 15~18wt% of the sum of the base material and the aggregate, stir evenly, vibrate and form, maintain at room temperature for 6~12 hours, and finally keep warm at 90~110°C for 12~ After 24 hours, the electric furnace cover castable with aluminum chromium slag as the main material was prepared.

[0039] The electric furnace cover cast...

Embodiment 3

[0041] An electric furnace cover castable with aluminum chromium slag as the main material and a preparation method thereof. The preparation method described in this embodiment is:

[0042] With 12~14wt% zirconium corundum particles and 52~54wt% aluminum chromium slag particles as aggregate, 14~16wt% aluminum chromium slag fine powder, 5~7wt% Cr 7 C 3 Fine powder, 11~13wt% ρ-Al 2 o 3 Micropowder and 1~3wt% yttrium oxide micropowder are base materials; according to the content of the aggregate and the base material, first mix the base material, then add the mixed base material into the aggregate, mix uniform; then add aluminum sol accounting for 17~20wt% of the sum of the base material and the aggregate, stir evenly, vibrate and shape, maintain at room temperature for 6~12 hours, and finally keep warm at 90~110°C for 12~ After 24 hours, the electric furnace cover castable with aluminum chromium slag as the main material was prepared.

[0043] The electric furnace cover cas...

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Abstract

The invention relates to electric furnace cover castable with aluminum-chromium slag being a main material and a preparation method thereof. According to the technical scheme, 10-15 wt% of fused zirconia alumina particles and 50-55 wt% of aluminum-chromium slag particles serve as aggregate, and 13-18 wt% of aluminum-chromium slag fine powder, 5-8 wt% of Cr7C3 fine powder, 10-15 wt% of rho-Al2O3 micro powder nad 1-4 wt% of yttrium oxide micro powder serve as a substrate material; according to the content of the aggregate and the content of the substrate material, the substrate material is first mixed uniformly and then added into the aggregate, and the mixture is mixed uniformly; then, alumina soil which accounts for 15-20 wt% of the sum of the substrate material and the aggregate is added, the mixture is stirred uniformly, subjected to vibration molding, maintained for 6-12 h at room temperature and kept warm for 12-24 h at the temperature of 90-110 DEG C, and finally the electric furnace cover castable with the aluminum-chromium slag being the main material is prepared. The method has the advantages of being low in cost and simple in technology; the prepared electric furnace cover castable is low in specific gravity, high in strength, excellent in thermal shock resistance and volume stability.

Description

technical field [0001] The invention belongs to the technical field of electric furnace cover pouring material. In particular, it relates to an electric furnace cover pouring material with aluminum chromium slag as the main material and a preparation method thereof. Background technique [0002] The electric furnace is an important equipment for iron and steel smelting. The electric furnace cover is located on the top of the electric furnace, with electrode holes and feeding holes. In addition, the electric furnace cover is a special-shaped structure with a curved surface, which makes the electric furnace cover vulnerable to strong heat radiation and slag during service. Especially with the development of electric furnace steelmaking process, the proportion of high-power / ultra-high-power electric furnace steelmaking is gradually increasing, and smelting conditions such as high melting temperature, short melting cycle and frequent rapid cooling and rapid heating affect the S...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
CPCC04B35/66
Inventor 张寒赵惠忠易萍赵鹏达何晴丁雄风余俊
Owner 锦州集信高温材料有限公司
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