阅读说明：本技术 一种长寿命抗侵蚀抗剥落电弧炉炉盖及其制备方法 (Long-life anti-erosion anti-stripping electric arc furnace cover and preparation method thereof ) 是由 樊春霞 秦振敏 郑丽东 于 2020-07-21 设计创作，主要内容包括：本发明公开了一种长寿命抗侵蚀抗剥落电弧炉炉盖及其制备方法,涉及电弧炉炉盖技术领域,其中该电弧炉炉盖包括以下按照重量份计的原料：高铝矾土和板状刚玉组成的骨料,镁铝尖晶石粉、纳米级氧化铝微粉和板状刚玉粉组成的粉剂,结合剂,减水剂；本发明提供的电弧炉炉盖热振性好、抗剥落,其主要原材料采用高温烧结板状刚玉,纯度高耐火度2000度；电熔尖晶石粉,热振性极好,材料化学性能接近电弧炉炉渣性质；本发明提供的电弧炉炉盖寿命长,由于材料本身热振性好抗侵蚀、抗剥落,使用过程中能够与电炉炉渣有机结合,附着到电弧炉炉盖下表面,保护炉盖材料热容稳定,不受温度波动困扰,使用效果好,使用寿命高达2000炉次。(The invention discloses a long-life anti-erosion anti-stripping electric arc furnace cover and a preparation method thereof, and relates to the technical field of electric arc furnace covers, wherein the electric arc furnace cover comprises the following raw materials in parts by weight: aggregate consisting of high-alumina and tabular corundum, powder consisting of magnesium-aluminum spinel powder, nano-grade alumina micro powder and tabular corundum powder, a bonding agent and a water reducing agent; the electric arc furnace cover provided by the invention has good thermal vibration performance and stripping resistance, and the main raw material adopts high-temperature sintered plate-shaped corundum, so that the purity is high, and the refractoriness is 2000 ℃; the electrically fused spinel powder has excellent thermal vibration performance, and the chemical performance of the material is close to the slag property of an electric arc furnace; the electric arc furnace cover provided by the invention has long service life, and the material has good thermal vibration performance, corrosion resistance and peeling resistance, so that the material can be organically combined with electric furnace slag in the using process and attached to the lower surface of the electric arc furnace cover, the material of the electric arc furnace cover is protected to have stable heat capacity and is not disturbed by temperature fluctuation, the using effect is good, and the service life is as long as 2000 heats.)

1. The long-life erosion-resistant and anti-stripping electric arc furnace cover is characterized by comprising the following raw materials in parts by weight: 30-40 parts of high-alumina and 30-40 parts of tabular corundum, 5-8 parts of magnesium aluminate spinel powder, 3-7 parts of nano-grade alumina micro powder and 7-10 parts of tabular corundum powder, 5-8 parts of a bonding agent and 0.6-0.9 part of a water reducing agent.

2. The long life erosion and spallation resistant electric arc furnace cover of claim 1, comprising the following raw materials in parts by weight: 33-37 parts of high-alumina and 33-37 parts of tabular corundum, 6-7 parts of magnesium aluminate spinel powder, 4-6 parts of nano-grade alumina micro powder and 8-9 parts of tabular corundum powder, 6-7 parts of binding agent and 0.7-0.8 part of water reducing agent.

3. The long life erosion and spallation resistant electric arc furnace cover of claim 2, comprising the following raw materials in parts by weight: 35 parts of high-alumina and 35 parts of tabular corundum, 6.5 parts of magnesium aluminate spinel powder, 5 parts of nano-grade alumina micro powder and 7 parts of tabular corundum powder, 6.5 parts of a bonding agent and 0.75 part of a water reducing agent.

4. The long life erosion and spallation resistant electric arc furnace roof as in claim 1, wherein the bauxite has a particle size of 0.1 to 30 mm.

5. The long life erosion and spallation resistant electric arc furnace cover as in claim 1, wherein the plate corundum has a particle size of 0.1-10 mm.

6. The long life erosion and spallation resistant electric arc furnace cover of claim 1, wherein the magnesium aluminum spinel powder is 200 mesh.

7. The long life erosion and spallation resistant electric arc furnace cover of claim 1, wherein the water reducer is ADW1 or ADS 1.

8. A method for manufacturing a furnace lid of an electric arc furnace with long life, erosion resistance and spalling resistance according to any of the claims from 1 to 7, characterized in that it comprises the following steps:

step one, high-alumina bauxite and tabular corundum are tightly stacked to form aggregate, and powder consisting of magnesium aluminate spinel powder, nano-grade alumina micro powder and tabular corundum powder is added and uniformly stirred;

step two, adding a water reducing agent and uniformly stirring;

step three, adding a bonding agent and uniformly stirring;

step four, assembling the die, fixing the motor holes in the triangular area, and brushing a release agent;

step five, adding the mixture into a forced mixer and uniformly stirring the mixture;

step six, adding water and then uniformly stirring;

discharging into a mold, and vibrating and molding by using a vibrating rod;

step eight, demolding after natural solidification;

and step nine, naturally drying to a usable state.

9. The method for preparing the furnace cover of the electric arc furnace with the long service life, the erosion resistance and the peeling resistance as recited in claim 8, is characterized by comprising the following steps:

step one, high-alumina bauxite and tabular corundum are tightly stacked to form aggregate, powder consisting of magnesium aluminate spinel powder, nanometer alumina micro powder and tabular corundum powder is added, and stirring is carried out for 1-3 minutes;

step two, adding a water reducing agent and stirring for 0.5-2 minutes;

adding a binding agent and stirring for 6-10 minutes;

step four, assembling the die, fixing the motor holes in the triangular area, and brushing a release agent;

step five, adding the mixture into a forced mixer and stirring for 0.5-2 minutes;

step six, adding water and then uniformly stirring for 3-7 minutes;

discharging into a mold, and vibrating and molding by using a vibrating rod;

step eight, demolding after natural solidification for 15-25 hours;

and step nine, naturally drying to a usable state.

10. The method for preparing the furnace cover of the electric arc furnace with the long service life, the erosion resistance and the peeling resistance as recited in claim 9, is characterized by comprising the following steps:

step one, high-alumina bauxite and tabular corundum are tightly stacked to form aggregate, powder consisting of magnesium aluminate spinel powder, nanometer alumina micro powder and tabular corundum powder is added, and stirring is carried out for 2 minutes;

step two, adding a water reducing agent and stirring for 1 minute;

adding a bonding agent and stirring for 8 minutes;

step four, assembling the die, fixing the motor holes in the triangular area, and brushing a release agent;

step five, adding the mixture into a forced mixer and stirring for 1 minute;

adding water and then uniformly stirring for 5 minutes;

discharging into a mold, and vibrating and molding by using a vibrating rod;

step eight, demoulding after natural solidification for 20 hours;

and step nine, naturally drying to a usable state.

Technical Field

The invention relates to the technical field of electric arc furnace covers, in particular to an electric arc furnace cover with long service life, erosion resistance and peeling resistance and a preparation method thereof.

Background

The furnace cover of the electric arc furnace is built by phosphate bricks at the initial stage, the service life of the furnace is about 100 generally, and the bricks are poor in integrity, so that the bricks are easy to loosen and cause overall collapse in the use process of a triangular area, and the use is stopped.

The periphery of the furnace cover of the second generation integral electric arc furnace is generally provided with a water-cooling pipe structure, and a furnace cover electrode triangular area is prefabricated and formed by adopting casting materials and is arranged on a water-cooling ring for combined use. Because the castable has poor thermal vibration and erosion resistance, the whole prefabricated triangular area of the castable is easy to peel off. The service life is 300-500 heats, which is far from meeting the steel-making requirement, and is a big disadvantage of electric furnace steel-making.

Therefore, the existing electric arc furnace covers have the problems of short service life and easy peeling.

Disclosure of Invention

The present invention aims to provide a long-life erosion-resistant and anti-peeling electric arc furnace cover to solve the problems of the background art.

In order to achieve the purpose, the invention provides the following technical scheme:

the long-life erosion-resistant anti-stripping electric arc furnace cover comprises the following raw materials in parts by weight: 30-40 parts of high-alumina and 30-40 parts of tabular corundum, 5-8 parts of magnesium aluminate spinel powder, 3-7 parts of nano-grade alumina micro powder and 7-10 parts of tabular corundum powder, 5-8 parts of a bonding agent and 0.6-0.9 part of a water reducing agent.

As a further scheme of the invention: the long-life erosion-resistant and anti-stripping electric arc furnace cover comprises the following raw materials in parts by weight: 33-37 parts of high-alumina and 33-37 parts of tabular corundum, 6-7 parts of magnesium aluminate spinel powder, 4-6 parts of nano-grade alumina micro powder and 8-9 parts of tabular corundum powder, 6-7 parts of binding agent and 0.7-0.8 part of water reducing agent.

As a further scheme of the invention: the long-life erosion-resistant and anti-stripping electric arc furnace cover comprises the following raw materials in parts by weight: 35 parts of high-alumina and 35 parts of tabular corundum, 6.5 parts of magnesium aluminate spinel powder, 5 parts of nano-grade alumina micro powder and 7 parts of tabular corundum powder, 6.5 parts of a bonding agent and 0.75 part of a water reducing agent.

As a further scheme of the invention: the grain diameter of the high bauxite is 0.1-30 mm.

As a further scheme of the invention: the particle size of the plate-shaped corundum is 0.1-10 mm.

As a further scheme of the invention: the magnesium aluminate spinel powder is 200 meshes.

As a further scheme of the invention: the water reducing agent is ADW1 or ADS 1.

Another objective of the present invention is to provide a method for manufacturing the furnace cover of the electric arc furnace with long service life, erosion resistance and spalling resistance, comprising the following steps:

step one, high-alumina bauxite and tabular corundum are tightly stacked to form aggregate, and powder consisting of magnesium aluminate spinel powder, nano-grade alumina micro powder and tabular corundum powder is added and uniformly stirred;

step two, adding a water reducing agent and uniformly stirring;

step three, adding a bonding agent and uniformly stirring;

step four, assembling the die, fixing the motor holes in the triangular area, and brushing a release agent;

step five, adding the mixture into a forced mixer and uniformly stirring the mixture;

step six, adding water and then uniformly stirring;

discharging into a mold, and vibrating and molding by using a vibrating rod;

step eight, demolding after natural solidification;

and step nine, naturally drying to a usable state.

As a further scheme of the invention: the preparation method of the long-life anti-erosion anti-stripping electric arc furnace cover comprises the following steps:

step one, high-alumina bauxite and tabular corundum are tightly stacked to form aggregate, powder consisting of magnesium aluminate spinel powder, nanometer alumina micro powder and tabular corundum powder is added, and stirring is carried out for 1-3 minutes;

step two, adding a water reducing agent and stirring for 0.5-2 minutes;

adding a binding agent and stirring for 6-10 minutes;

step four, assembling the die, fixing the motor holes in the triangular area, and brushing a release agent;

step five, adding the mixture into a forced mixer and stirring for 0.5-2 minutes;

step six, adding water and then uniformly stirring for 3-7 minutes;

discharging into a mold, and vibrating and molding by using a vibrating rod;

step eight, demolding after natural solidification for 15-25 hours;

and step nine, naturally drying to a usable state.

As a further scheme of the invention: the preparation method of the long-life anti-erosion anti-stripping electric arc furnace cover comprises the following steps:

step one, high-alumina bauxite and tabular corundum are tightly stacked to form aggregate, powder consisting of magnesium aluminate spinel powder, nanometer alumina micro powder and tabular corundum powder is added, and stirring is carried out for 2 minutes;

step two, adding a water reducing agent and stirring for 1 minute;

adding a bonding agent and stirring for 8 minutes;

step four, assembling the die, fixing the motor holes in the triangular area, and brushing a release agent;

step five, adding the mixture into a forced mixer and stirring for 1 minute;

adding water and then uniformly stirring for 5 minutes;

discharging into a mold, and vibrating and molding by using a vibrating rod;

step eight, demoulding after natural solidification for 20 hours;

and step nine, naturally drying to a usable state.

Compared with the prior art, the invention has the beneficial effects that:

1. the electric arc furnace cover provided by the invention has good thermal vibration performance and stripping resistance, and the main raw material adopts high-temperature sintered plate-shaped corundum, so that the purity is high, and the refractoriness is 2000 ℃; the electrically fused spinel powder has excellent thermal vibration performance, and the chemical performance of the material is close to the slag property of an electric arc furnace;

2. the electric arc furnace cover provided by the invention has long service life, and the material has good thermal vibration performance, corrosion resistance and peeling resistance, so that the material can be organically combined with electric furnace slag in the using process and attached to the lower surface of the electric arc furnace cover, the material of the electric arc furnace cover is protected to have stable heat capacity and is not disturbed by temperature fluctuation, the using effect is good, and the service life is as long as 2000 heats.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to specific embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.