阅读说明：本技术 一种钢包渣线用防氧化涂料、涂层及其制备方法 (Anti-oxidation coating for ladle slag line, coating and preparation method thereof ) 是由 王团收 张盛 刘丽 贾祥超 颜浩 任林 刘靖轩 李健 于 2021-02-05 设计创作，主要内容包括：本发明提供一种钢包渣线用防氧化涂料、涂层及其制备方法。钢包渣线用防氧化涂料,按照质量份数计算,其制备原料包括以下组分：钾长石细粉10-50份、硼玻璃细粉10-50份、金属硅细粉5-40份、碳化硅细粉1-20份、氧化铝微粉1-20份、硅微粉0.1-10份、白泥细粉1-20份、分散剂0.1-1份、增黏剂0.05-1份。该钢包渣线用防氧化涂料中各组分可在不同阶段通过相变、化学反应、相互作用等,在渣线砖表面产生隔绝空气的层,从而持续解决钢包在大火急速烘烤或大火长时间烘烤时钢包渣线脱碳的问题。(The invention provides an anti-oxidation coating for a ladle slag line, a coating and a preparation method thereof. The anti-oxidation coating for the ladle slag line comprises the following preparation raw materials in parts by mass: 10-50 parts of potassium feldspar fine powder, 10-50 parts of boron glass fine powder, 5-40 parts of metal silicon fine powder, 1-20 parts of silicon carbide fine powder, 1-20 parts of alumina micro powder, 0.1-10 parts of silicon micro powder, 1-20 parts of white mud fine powder, 0.1-1 part of dispersing agent and 0.05-1 part of tackifier. The components in the anti-oxidation coating for the steel ladle slag line can generate an air-isolating layer on the surface of a slag line brick through phase change, chemical reaction, interaction and the like in different stages, so that the problem of decarburization of the steel ladle slag line when a steel ladle is rapidly baked on a big fire or baked on a big fire for a long time is continuously solved.)

1. The anti-oxidation coating for the ladle slag line is characterized by comprising the following preparation raw materials in parts by mass:

10-50 parts of potassium feldspar fine powder, 10-50 parts of boron glass fine powder, 5-40 parts of metal silicon fine powder, 1-20 parts of silicon carbide fine powder, 1-20 parts of alumina micro powder, 0.1-10 parts of silicon micro powder, 1-20 parts of white mud fine powder, 0.1-1 part of dispersing agent and 0.05-1 part of tackifier.

2. The anti-oxidation coating for the ladle slag line according to claim 1, which is characterized by comprising the following raw materials in parts by mass:

20-35 parts of potassium feldspar fine powder, 25-35 parts of boron glass fine powder, 15-25 parts of metal silicon fine powder, 5-10 parts of silicon carbide fine powder, 2-7 parts of alumina micro powder, 1-4 parts of silicon micro powder, 4-10 parts of white mud fine powder, 0.2-0.6 part of dispersing agent and 0.1-0.5 part of tackifier.

3. The anti-oxidation coating for the ladle slag line according to claim 1, characterized in that:

the dispersing agent is sodium hexametaphosphate, and the tackifier is sodium carboxymethyl cellulose.

4. The anti-oxidation coating for the ladle slag line according to claim 1, characterized in that:

the particle size of the potassium feldspar fine powder is 0.045-0.074 mm; the particle size of the boron glass fine powder is 0.045-0.074 mm; the particle size of the metal silicon fine powder is 0.045-0.074 mm; the particle size of the silicon carbide fine powder is 0.045-0.074 mm; the particle size of the alumina micro powder is 1-3 mu m; the particle size of the silicon micro powder is 0.025-0.045 mm; the grain diameter of the white mud fine powder is 0.045-0.074 mm.

5. The anti-oxidation coating for the ladle slag line according to claim 1, characterized in that:

in the fine potassium feldspar powder, SiO is contained₂60 to 70 weight percent of Al₂O₃15-20 wt.%, K₂10 to 15 weight percent of O and Na₂The content of O is 2 to 5 weight percent.

6. The anti-oxidation coating for the ladle slag line according to claim 1, characterized in that:

in the fine boron glass powder, SiO₂20 to 30 weight percent of B₂O₃40-50 wt% of Na₂The content of O is 10 to 20 weight percent.

7. The anti-oxidation coating for the ladle slag line according to claim 1, characterized in that:

in the metal silicon fine powder, the content of Si is more than 98 wt%; in the silicon carbide fine powder, the content of SiC is more than 97 wt%; in the fine alumina powder, Al₂O₃The content is more than 99 wt%; in the fine silicon powder, SiO₂The content is more than 92 wt%.

8. The anti-oxidation coating for the ladle slag line according to claim 1, characterized in that:

in the fine white mud powder, SiO₂45-55 wt% of Al₂O₃25 to 30 weight percent of Fe₂O₃The content is 0.5 to 2 weight percent, and the ignition loss is 10 to 15 weight percent.

9. A method for preparing the oxidation preventing coating for the ladle slag line according to any one of claims 1 to 8, comprising the steps of:

mixing the preparation raw materials of the anti-oxidation coating for the steel ladle slag line with water, and stirring to obtain the anti-oxidation coating for the steel ladle slag line, wherein the mass of the water is 35-40% of the total mass of the preparation raw materials of the anti-oxidation coating for the steel ladle slag line.

10. An oxidation-resistant coating for a ladle slag line, which is obtained by coating or spraying the oxidation-resistant coating for a ladle slag line according to any one of claims 1 to 8.

Technical Field

The invention belongs to the technical field of refractory materials, and particularly relates to an anti-oxidation coating for a steel ladle slag line, a coating and a preparation method thereof.

Background

Along with the increase of the demand of the market on variety steel, the variety steel is smelted more and more in a steel plant, and a refining ladle is important molten steel smelting equipment. LF refining, RH refining and VOD refining are the most domestic smelting methods. The refractory materials at the slag line part of the ladle are the parts with the fastest consumption in the refining process of the ladle and are the parts with the lowest service life in the refractory materials of the ladle, if the service life of the refractory materials of the slag line of the ladle can be effectively prolonged, short plates of the refractory materials of the ladle can be made up, the refractory materials at all parts of the ladle can be matched with each other in the best service life, and therefore the utilization rate of the refractory materials is improved.

The refractory material at the slag line part of the refining ladle is mainly magnesia carbon bricks, and the high-carbon slag line has longer service life and is safer than a low-carbon slag line. But the decarbonization of the high-carbon slag line is also the most serious when the steel ladle is baked, the decarbonization layer can reach 10-15 mm, the decarbonization layer generated when the steel ladle is baked can lose strength, the steel ladle can be completely flushed when the steel ladle is used for the first time, and the effective working layer thickness of the slag line brick is reduced. Therefore, an anti-oxidation coating is usually required to be coated outside the slag line brick to reduce the decarburization condition of the slag line part during the baking of the ladle, but the traditional slag line anti-oxidation coating has a low melting point and a large number of volatile substances, and the coating is easy to flow or volatilize too fast to lose the anti-oxidation effect during the rapid baking with a big fire or the long-time baking with a big fire. Therefore, it is required to provide an anti-oxidation coating for a ladle slag line, which can continuously play an anti-oxidation role at a high temperature and solve the problem of ladle slag line decarburization when a ladle is rapidly baked with a strong fire or baked for a long time with a strong fire.

Disclosure of Invention

The technical problem to be solved by the invention is to provide an anti-oxidation coating for a steel ladle slag line, a coating and a preparation method thereof, wherein each component in the coating generates an air-isolated layer on the surface of a slag line brick through phase change, chemical reaction, interaction and the like in different stages, so that the problem of decarburization of the steel ladle slag line when the steel ladle is rapidly baked with big fire or baked for a long time with big fire is continuously solved.

In order to solve the problems, one aspect of the invention provides an anti-oxidation coating for a ladle slag line, which comprises the following preparation raw materials in parts by mass:

10-50 parts of potassium feldspar fine powder, 10-50 parts of boron glass fine powder, 5-40 parts of metal silicon fine powder, 1-20 parts of silicon carbide fine powder, 1-20 parts of alumina micro powder, 0.1-10 parts of silicon micro powder, 1-20 parts of white mud fine powder, 0.1-1 part of dispersing agent and 0.05-1 part of tackifier.

Preferably, the preparation raw materials comprise the following components in parts by weight:

20-35 parts of potassium feldspar fine powder, 25-35 parts of boron glass fine powder, 15-25 parts of metal silicon fine powder, 5-10 parts of silicon carbide fine powder, 2-7 parts of alumina micro powder, 1-4 parts of silicon micro powder, 4-10 parts of white mud fine powder, 0.2-0.6 part of dispersing agent and 0.1-0.5 part of tackifier.

Preferably, the dispersing agent is sodium hexametaphosphate, and the viscosity increasing agent is sodium carboxymethyl cellulose.

Preferably, the particle size of the potassium feldspar fine powder is 0.045-0.074 mm; the particle size of the boron glass fine powder is 0.045-0.074 mm; the particle size of the metal silicon fine powder is 0.045-0.074 mm; the particle size of the silicon carbide fine powder is 0.045-0.074 mm; the particle size of the alumina micro powder is 1-3 mu m; the particle size of the silicon micro powder is 0.025-0.045 mm; the grain diameter of the white mud fine powder is 0.045-0.074mm

Preferably, in the fine potassium feldspar powder, SiO is contained₂60 to 70 weight percent of Al₂O₃15-20 wt.%, K₂10 to 15 weight percent of O and Na₂The content of O is 2 to 5 weight percent.

Preferably, in the boron glass fine powder, SiO₂20 to 30 weight percent of B₂O₃40-50 wt% of Na₂The content of O is 10 to 20 weight percent.

Preferably, in the metallic silicon fine powder, the content of Si is more than 98 wt%; in the silicon carbide fine powder, the content of SiC is more than 97 wt%; in the fine alumina powder, Al₂O₃The content is more than 99 wt%; in the fine silicon powder, SiO₂The content is more than 92 wt%.

Preferably, in the fine white mud powder, SiO is₂45-55 wt% of Al₂O₃25 to 30 weight percent of Fe₂O₃The content is 0.5 to 2 weight percent, and the ignition loss is 10 to 15 weight percent.

In another aspect of the present invention, a method for preparing the above anti-oxidation coating for a ladle slag line is provided, which comprises the following steps:

mixing the preparation raw materials of the anti-oxidation coating for the steel ladle slag line with water, and stirring to obtain the anti-oxidation coating for the steel ladle slag line, wherein the mass of the water is 35-40% of the total mass of the preparation raw materials of the anti-oxidation coating for the steel ladle slag line.

Preferably, the method for preparing the anti-oxidation coating for the ladle slag line comprises the following steps:

s1, weighing the preparation raw materials of the anti-oxidation coating for the ladle slag line according to the selected parts by mass;

s2, adding the preparation raw materials of the anti-oxidation coating for the steel ladle slag line into a stirrer to be stirred for 2-3 minutes to obtain a mixture, then adding water accounting for 35-40% of the total mass of the mixture into the mixture, and stirring for 5-7 minutes to obtain the anti-oxidation coating for the steel ladle slag line.

The invention also provides an anti-oxidation coating for the ladle slag line, which is obtained by smearing or spraying the anti-oxidation coating for the ladle slag line.

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

1. in the preparation raw materials of the anti-oxidation coating for the steel ladle slag line, potassium feldspar fine powder, white mud fine powder and boron glass fine powder are low-melting-point raw materials, and the boron glass fine powder is firstly melted at 500 ℃ to form a glass phase attached to a slag line brickThe surface is isolated from air; along with the temperature rise, the silicon carbide fine powder and the metal silicon fine powder can be oxidized into silicon oxide, and the viscosity of a glass phase can be improved and the fluidity of the coating can be reduced after the silicon oxide and the boron glass fine powder are subjected to solid solution; TiO in lime mud fine powder₂And Fe₂O₃Also increases the viscosity of the glass phase so that the coating does not "flow" at 500-900 ℃. When the temperature is continuously increased to 1100-1200 ℃, boron glass cannot play a role in isolating air, the surface of the brick with the slag line densely distributed with residual silicon carbide and alumina is isolated from air, and the high-activity alumina micro powder can react with magnesia in the magnesia carbon brick to generate a thin layer of sintered spinel, so that the effect of preventing oxidation can be played at high temperature. The anti-oxidation coating forms an air-isolated layer on the surface of a slag line brick through phase change, chemical reaction, interaction and the like of different components at different stages, thereby continuously solving the problem of ladle slag line decarburization when a ladle is rapidly baked with a big fire or baked for a long time with a big fire;

2. the anti-oxidation coating for the ladle slag line provided by the invention has the advantages that the obtained anti-oxidation coating for the ladle slag line has a better air isolation effect and prevents the decarburization of a magnesia carbon brick by reasonably optimizing the use amount of each component in the preparation raw materials and optimizing the particle size range of each component.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.

The invention provides an anti-oxidation coating for a ladle slag line, which comprises the following raw materials in parts by weight:

10-50 parts of potassium feldspar fine powder, 10-50 parts of boron glass fine powder, 5-40 parts of metal silicon fine powder, 1-20 parts of silicon carbide fine powder, 1-20 parts of alumina micro powder, 0.1-10 parts of silicon micro powder, 1-20 parts of white mud fine powder, 0.1-1 part of dispersing agent and 0.05-1 part of tackifier.

In the preparation raw materials of the anti-oxidation coating for the steel ladle slag line, potassium feldspar fine powder, white mud fine powder and boron glass fine powder are low-melting-point raw materials, and the boron glass fine powder is firstly melted at 500 ℃ to form a glass phase which is attached to the surface of a slag line brick to isolate air; along with the temperature rise, the silicon carbide fine powder and the metal silicon fine powder can be oxidized into silicon oxide, and the viscosity of a glass phase can be improved and the fluidity of the coating can be reduced after the silicon oxide and the boron glass fine powder are subjected to solid solution; TiO in lime mud fine powder₂And Fe₂O₃Also increases the viscosity of the glass phase so that the coating does not "flow" at 500-900 ℃. When the temperature is continuously increased to 1100-1200 ℃, boron glass can not play a role of isolating air, the surface of the slag line brick with the densely distributed silicon carbide and alumina is isolated from air, and the high-activity alumina micro powder can react with magnesia in the magnesia carbon brick to generate a thin layer of sintered spinel, so that the effect of preventing oxidation can be continuously played at high temperature, and the problem of ladle slag line decarburization when the ladle is rapidly baked at high fire or baked for a long time at high fire is solved.

Preferably, the preparation raw materials comprise the following components in parts by weight:

20-35 parts of potassium feldspar fine powder, 25-35 parts of boron glass fine powder, 15-25 parts of metal silicon fine powder, 5-10 parts of silicon carbide fine powder, 2-7 parts of alumina micro powder, 1-4 parts of silicon micro powder, 4-10 parts of white mud fine powder, 0.2-0.6 part of dispersing agent and 0.1-0.5 part of tackifier.

Through a large number of experimental trials, when the amount of each component in the raw materials is selected from the preferable range, the obtained anti-oxidation coating for the ladle slag line can better isolate air and prevent the magnesia carbon brick from decarbonization.

Preferably, the dispersing agent is sodium hexametaphosphate, and the viscosity increasing agent is sodium carboxymethyl cellulose.

Preferably, the particle size of the potassium feldspar fine powder is 0.045-0.074 mm; the particle size of the boron glass fine powder is 0.045-0.074 mm; the particle size of the metal silicon fine powder is 0.045-0.074 mm; the particle size of the silicon carbide fine powder is 0.045-0.074 mm; the particle size of the alumina micro powder is 1-3 mu m; the particle size of the silicon micro powder is 0.025-0.045 mm; the grain diameter of the white mud fine powder is 0.045-0.074 mm.

Experimental trials show that the proportion of particles and fine powder in the design of the anti-oxidation coating can be greatly met by adopting the particle size grading, and the volume density of the anti-oxidation coating reaches the optimal value by planning the mass fractions of raw materials with different particle sizes according to the closest packing principle, so that the performance of the anti-oxidation coating can be improved.

Preferably, in the fine potassium feldspar powder, SiO is contained₂60 to 70 weight percent of Al₂O₃15-20 wt.%, K₂10 to 15 weight percent of O and Na₂The content of O is 2 to 5 weight percent.

Preferably, in the boron glass fine powder, SiO₂20 to 30 weight percent of B₂O₃40-50 wt% of Na₂The content of O is 10 to 20 weight percent.

Preferably, in the metallic silicon fine powder, the content of Si is more than 98 wt%; in the silicon carbide fine powder, the content of SiC is more than 97 wt%; in the fine alumina powder, Al₂O₃The content is more than 99 wt%; in the fine silicon powder, SiO₂The content is more than 92 wt%.

Preferably, in the fine white mud powder, SiO is₂45-55 wt% of Al₂O₃25 to 30 weight percent of Fe₂O₃The content is 0.5 to 2 weight percent, and the ignition loss is 10 to 15 weight percent.

The invention provides a method for preparing the anti-oxidation coating for the ladle slag line, which comprises the following steps:

mixing the preparation raw materials of the anti-oxidation coating for the steel ladle slag line with water, and stirring to obtain the anti-oxidation coating for the steel ladle slag line, wherein the mass of the water is 35-40% of the total mass of the preparation raw materials of the anti-oxidation coating for the steel ladle slag line.

Preferably, the method for preparing the anti-oxidation coating for the ladle slag line comprises the following steps:

s1, weighing the preparation raw materials of the anti-oxidation coating for the ladle slag line according to the selected parts by mass;

s2, adding the preparation raw materials of the anti-oxidation coating for the steel ladle slag line into a stirrer to be stirred for 2-3 minutes to obtain a mixture, then adding water accounting for 35-40% of the total mass of the mixture into the mixture, and stirring for 5-7 minutes to obtain the anti-oxidation coating for the steel ladle slag line.

The invention also provides an anti-oxidation coating for the ladle slag line, which is obtained by smearing or spraying the anti-oxidation coating for the ladle slag line.

Example 1

The anti-oxidation coating for the ladle slag line comprises the following preparation raw materials in parts by mass:

30 parts of potassium feldspar fine powder with the particle size of 0.045-0.074mm, 30 parts of boron glass fine powder with the particle size of 0.045-0.074mm, 20 parts of metal silicon fine powder with the particle size of 0.045-0.074mm, 7.5 parts of silicon carbide fine powder with the particle size of 0.045-0.074mm, 5 parts of alumina micro powder with the particle size of 1-3 mu m, 2 parts of silicon micro powder with the particle size of 0.025-0.045mm, 5 parts of white mud fine powder with the particle size of 0.045-0.074mm, 0.3 part of sodium hexametaphosphate serving as a dispersing agent and 0.2 part of carboxymethyl cellulose sodium serving as a tackifier.

The preparation method of the anti-oxidation coating for the ladle slag line comprises the following steps:

s1, weighing the preparation raw materials of the anti-oxidation coating for the ladle slag line according to the selected parts by mass;

s2, adding the preparation raw materials of the anti-oxidation coating for the steel ladle slag line into a stirrer to be stirred for 3 minutes to obtain a mixture, then adding water accounting for 40% of the total mass of the mixture into the mixture, and stirring for 5 minutes until the mixture becomes uniform slurry to obtain the anti-oxidation coating for the steel ladle slag line.

And uniformly coating the ladle slag line on the surface of the magnesia carbon brick by using an anti-oxidation coating, wherein the coating thickness is about 1mm, and placing the magnesia carbon brick in an oven to dry for 110 ℃ for 24 hours. And then putting the magnesia carbon brick into a high-temperature furnace, and heating according to a ladle baking curve. And taking out the magnesia carbon brick after baking, and laying the brick to measure that the thickness of the oxidation decarburization layer is 1.2 mm. The coating can better isolate air to prevent the magnesia carbon brick from decarbonizing.

Example 2

The anti-oxidation coating for the ladle slag line comprises the following preparation raw materials in parts by mass:

25 parts of potassium feldspar fine powder with the particle size of 0.045-0.074mm, 30 parts of boron glass fine powder with the particle size of 0.045-0.074mm, 25 parts of metal silicon fine powder with the particle size of 0.045-0.074mm, 7 parts of silicon carbide fine powder with the particle size of 0.045-0.074mm, 6.5 parts of alumina micro powder with the particle size of 1-3 mu m, 2 parts of silicon micro powder with the particle size of 0.025-0.045mm, 4 parts of white mud fine powder with the particle size of 0.045-0.074mm, 0.2 part of sodium hexametaphosphate serving as a dispersing agent and 0.3 part of carboxymethyl cellulose sodium serving as a tackifier.

The preparation method of the anti-oxidation coating for the ladle slag line comprises the following steps:

s1, weighing the preparation raw materials of the anti-oxidation coating for the ladle slag line according to the selected parts by mass;

s2, adding the preparation raw materials of the anti-oxidation coating for the steel ladle slag line into a stirrer to be stirred for 3 minutes to obtain a mixture, then adding water accounting for 40% of the total mass of the mixture into the mixture, and stirring for 5 minutes until the mixture becomes uniform slurry to obtain the anti-oxidation coating for the steel ladle slag line.

And uniformly coating the ladle slag line on the surface of the magnesia carbon brick by using an anti-oxidation coating, wherein the coating thickness is about 1mm, and placing the magnesia carbon brick in an oven to dry for 110 ℃ for 24 hours. And then putting the magnesia carbon brick into a high-temperature furnace, and heating according to a ladle baking curve. And taking out the magnesia carbon brick after baking, and laying the brick to measure that the thickness of the oxidation decarburization layer is 1.5 mm. The coating can better isolate air to prevent the magnesia carbon brick from decarbonizing.

Example 3

The anti-oxidation coating for the ladle slag line comprises the following preparation raw materials in parts by mass:

28 parts of potassium feldspar fine powder with the particle size of 0.045-0.074mm, 26 parts of boron glass fine powder with the particle size of 0.045-0.074mm, 23 parts of metal silicon fine powder with the particle size of 0.045-0.074mm, 5 parts of silicon carbide fine powder with the particle size of 0.045-0.074mm, 3 parts of alumina micro powder with the particle size of 1-3 mu m, 4 parts of silicon micro powder with the particle size of 0.025-0.045mm, 10 parts of white mud fine powder with the particle size of 0.045-0.074mm, 0.5 part of sodium hexametaphosphate serving as a dispersing agent and 0.5 part of carboxymethyl cellulose sodium serving as a viscosity increasing agent.

The preparation method of the anti-oxidation coating for the ladle slag line comprises the following steps:

s1, weighing the preparation raw materials of the anti-oxidation coating for the ladle slag line according to the selected parts by mass;

s2, adding the preparation raw materials of the anti-oxidation coating for the steel ladle slag line into a stirrer to be stirred for 3 minutes to obtain a mixture, then adding water accounting for 40% of the total mass of the mixture into the mixture, and stirring for 5 minutes until the mixture becomes uniform slurry to obtain the anti-oxidation coating for the steel ladle slag line.

And uniformly coating the ladle slag line on the surface of the magnesia carbon brick by using an anti-oxidation coating, wherein the coating thickness is about 1mm, and placing the magnesia carbon brick in an oven to dry for 110 ℃ for 24 hours. And then putting the magnesia carbon brick into a high-temperature furnace, and heating according to a ladle baking curve. And taking out the magnesia carbon brick after baking, and laying the brick to measure that the thickness of the oxidation decarburization layer is 1.7 mm. The coating can better isolate air to prevent the magnesia carbon brick from decarbonizing.

Example 4

The anti-oxidation coating for the ladle slag line comprises the following preparation raw materials in parts by mass:

20 parts of potassium feldspar fine powder with the particle size of 0.045-0.074mm, 35 parts of boron glass fine powder with the particle size of 0.045-0.074mm, 18 parts of metal silicon fine powder with the particle size of 0.045-0.074mm, 10 parts of silicon carbide fine powder with the particle size of 0.045-0.074mm, 2 parts of alumina micro powder with the particle size of 1-3 mu m, 4 parts of silicon micro powder with the particle size of 0.025-0.045mm, 10 parts of white mud fine powder with the particle size of 0.045-0.074mm, 0.6 part of sodium hexametaphosphate serving as a dispersing agent and 0.4 part of carboxymethyl cellulose sodium serving as a viscosity increasing agent.

The preparation method of the anti-oxidation coating for the ladle slag line comprises the following steps:

s1, weighing the preparation raw materials of the anti-oxidation coating for the ladle slag line according to the selected parts by mass;

s2, adding the preparation raw materials of the anti-oxidation coating for the steel ladle slag line into a stirrer to be stirred for 3 minutes to obtain a mixture, then adding water accounting for 40% of the total mass of the mixture into the mixture, and stirring for 5 minutes until the mixture becomes uniform slurry to obtain the anti-oxidation coating for the steel ladle slag line.

And uniformly coating the ladle slag line on the surface of the magnesia carbon brick by using an anti-oxidation coating, wherein the coating thickness is about 1mm, and placing the magnesia carbon brick in an oven to dry for 110 ℃ for 24 hours. And then putting the magnesia carbon brick into a high-temperature furnace, and heating according to a ladle baking curve. And taking out the magnesia carbon brick after baking, and laying the brick to measure that the thickness of the oxidation decarburization layer is 1.1 mm. The coating can better isolate air to prevent the magnesia carbon brick from decarbonizing.

Example 5

The anti-oxidation coating for the ladle slag line comprises the following preparation raw materials in parts by mass:

35 parts of potassium feldspar fine powder with the particle size of 0.045-0.074mm, 25 parts of boron glass fine powder with the particle size of 0.045-0.074mm, 15 parts of metal silicon fine powder with the particle size of 0.045-0.074mm, 5 parts of silicon carbide fine powder with the particle size of 0.045-0.074mm, 7 parts of alumina micro powder with the particle size of 1-3 mu m, 2.5 parts of silicon micro powder with the particle size of 0.025-0.045mm, 10 parts of white mud fine powder with the particle size of 0.045-0.074mm, 0.4 part of sodium hexametaphosphate serving as a dispersing agent and 0.1 part of carboxymethyl cellulose sodium serving as a tackifier.

The preparation method of the anti-oxidation coating for the ladle slag line comprises the following steps:

s1, weighing the preparation raw materials of the anti-oxidation coating for the ladle slag line according to the selected parts by mass;

s2, adding the preparation raw materials of the anti-oxidation coating for the steel ladle slag line into a stirrer to be stirred for 3 minutes to obtain a mixture, then adding water accounting for 40% of the total mass of the mixture into the mixture, and stirring for 5 minutes until the mixture becomes uniform slurry to obtain the anti-oxidation coating for the steel ladle slag line.

And uniformly coating the ladle slag line on the surface of the magnesia carbon brick by using an anti-oxidation coating, wherein the coating thickness is about 1mm, and placing the magnesia carbon brick in an oven to dry for 110 ℃ for 24 hours. And then putting the magnesia carbon brick into a high-temperature furnace, and heating according to a ladle baking curve. And taking out the magnesia carbon brick after baking, and laying the brick to measure that the thickness of the oxidation decarburization layer is 1.5 mm. The coating can better isolate air to prevent the magnesia carbon brick from decarbonizing.

Example 6

The anti-oxidation coating for the ladle slag line comprises the following preparation raw materials in parts by mass:

10 parts of potassium feldspar fine powder with the particle size of 0.045-0.074mm, 50 parts of boron glass fine powder with the particle size of 0.045-0.074mm, 5 parts of metal silicon fine powder with the particle size of 0.045-0.074mm, 20 parts of silicon carbide fine powder with the particle size of 0.045-0.074mm, 1 part of alumina micro powder with the particle size of 1-3 mu m, 0.1 part of silicon micro powder with the particle size of 0.025-0.045mm, 20 parts of white mud fine powder with the particle size of 0.045-0.074mm, 0.1 part of sodium hexametaphosphate serving as a dispersing agent and 1 part of carboxymethyl cellulose sodium serving as a tackifier.

The preparation method of the anti-oxidation coating for the ladle slag line comprises the following steps:

s1, weighing the preparation raw materials of the anti-oxidation coating for the ladle slag line according to the selected parts by mass;

s2, adding the preparation raw materials of the anti-oxidation coating for the steel ladle slag line into a stirrer to be stirred for 3 minutes to obtain a mixture, then adding water accounting for 35% of the total mass of the mixture into the mixture, and stirring for 5 minutes until the mixture becomes uniform slurry to obtain the anti-oxidation coating for the steel ladle slag line.

And uniformly coating the ladle slag line on the surface of the magnesia carbon brick by using an anti-oxidation coating, wherein the coating thickness is about 1mm, and placing the magnesia carbon brick in an oven to dry for 110 ℃ for 24 hours. And then putting the magnesia carbon brick into a high-temperature furnace, and heating according to a ladle baking curve. And taking out the magnesia carbon brick after baking, and laying the brick to measure that the thickness of the oxidation decarburization layer is 5.3 mm. The air isolation effect of the coating on preventing the magnesia carbon brick from decarbonizing is shown to be common. In the scheme, the boron glass is added in an excessive amount, so that the coating generates flowing at high temperature and cannot completely cover the surface of the magnesia carbon brick, and the effect is poor compared with that of examples 1-5.

Example 7

The anti-oxidation coating for the ladle slag line comprises the following preparation raw materials in parts by mass:

50 parts of potassium feldspar fine powder with the particle size of 0.045-0.074mm, 10 parts of boron glass fine powder with the particle size of 0.045-0.074mm, 40 parts of metal silicon fine powder with the particle size of 0.045-0.074mm, 1 part of silicon carbide fine powder with the particle size of 0.045-0.074mm, 20 parts of alumina micro powder with the particle size of 1-3 mu m, 10 parts of silicon micro powder with the particle size of 0.025-0.045mm, 1 part of white mud fine powder with the particle size of 0.045-0.074mm, 1 part of sodium hexametaphosphate serving as a dispersing agent and 0.05 part of carboxymethyl cellulose sodium serving as a viscosity increasing agent.

The preparation method of the anti-oxidation coating for the ladle slag line comprises the following steps:

s1, weighing the preparation raw materials of the anti-oxidation coating for the ladle slag line according to the selected parts by mass;

s2, adding the preparation raw materials of the anti-oxidation coating for the steel ladle slag line into a stirrer to be stirred for 3 minutes to obtain a mixture, then adding water accounting for 35% of the total mass of the mixture into the mixture, and stirring for 5 minutes until the mixture becomes uniform slurry to obtain the anti-oxidation coating for the steel ladle slag line.

And uniformly coating the ladle slag line on the surface of the magnesia carbon brick by using an anti-oxidation coating, wherein the coating thickness is about 1mm, and placing the magnesia carbon brick in an oven to dry for 110 ℃ for 24 hours. And then putting the magnesia carbon brick into a high-temperature furnace, and heating according to a ladle baking curve. And taking out the magnesia carbon brick after baking, and laying the brick to measure the thickness of the oxidized decarburized layer to be 4.6 mm. The coating can better isolate air to prevent the magnesia carbon brick from decarbonizing. According to the scheme, the addition amount of boron glass is insufficient, the coating cannot generate a glass phase at about 500 ℃, the cracking and peeling conditions of the coating are severe, and the coating cannot completely cover the surface of the magnesia carbon brick.

Comparative example 1

The anti-oxidation coating for the ladle slag line of the comparative example has the same content of other components as that of the example 1, and is different from the embodiment in that alumina micro powder is not added. The preparation method of the anti-oxidation coating for the ladle slag line of the comparative example is the same as that of the example 1.

And uniformly coating the ladle slag line on the surface of the magnesia carbon brick by using an anti-oxidation coating, wherein the coating thickness is about 1mm, and placing the magnesia carbon brick in an oven to dry for 110 ℃ for 24 hours. And then putting the magnesia carbon brick into a high-temperature furnace, and heating according to a ladle baking curve. And taking out the magnesia carbon brick after baking, and laying the brick to measure that the thickness of the oxidation decarburization layer is 8.6 mm. The result shows that the coating has poor effect of isolating air and preventing the magnesia carbon brick from decarbonizing. According to the scheme, alumina micropowder is not added, and the amount of formed sintering spinel at high temperature is insufficient, so that the magnesia carbon brick is decarburized.

Comparative example 2

The anti-oxidation coating for the ladle slag line of the comparative example has the same content of other components as that of the example 1, and is different from the method in that boron glass fine powder is not added. The preparation method of the anti-oxidation coating for the ladle slag line of the comparative example is the same as that of the example 1.

And uniformly coating the ladle slag line on the surface of the magnesia carbon brick by using an anti-oxidation coating, wherein the coating thickness is about 1mm, and placing the magnesia carbon brick in an oven to dry for 110 ℃ for 24 hours. And then putting the magnesia carbon brick into a high-temperature furnace, and heating according to a ladle baking curve. And taking out the magnesia carbon brick after baking, and laying the brick to measure that the thickness of the oxidation decarburization layer is 10.2 mm. The result shows that the coating has poor effect of isolating air and preventing the magnesia carbon brick from decarbonizing. According to the scheme, boron glass is not added, the coating does not form a glass phase at low temperature and medium temperature, and the magnesia carbon brick begins to be carbonized in the low-temperature and medium-temperature baking process.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.