CN108585797B - Self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride and preparation method thereof - Google Patents

Self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride and preparation method thereof Download PDF

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CN108585797B
CN108585797B CN201810468046.4A CN201810468046A CN108585797B CN 108585797 B CN108585797 B CN 108585797B CN 201810468046 A CN201810468046 A CN 201810468046A CN 108585797 B CN108585797 B CN 108585797B
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magnesia
fine powder
powder
temperature
sliding plate
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CN108585797A (en
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陈正常
余金红
周亮
张远红
纪凯
赵峰
余西平
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Maanshan Lier Kaiyuan New Material Co ltd
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Abstract

The invention discloses a self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride and a preparation method thereof, and relates toThe technical field of refractory materials. The sliding plate brick comprises the following raw materials in percentage by weight: 20-25% of magnesia-chromite-alumina sand with the granularity of 0-1 mm, 18-20% of magnesia-chromite-alumina sand with the granularity of 1-3 mm, 22-25% of magnesia-chromite-alumina sand with the granularity of 3-5 mm, 12% of magnesia-zirconia sand fine powder and alpha-Al2O34-5% of micro powder, 1-3% of silicon carbide fine powder, 2-5% of metal silicon powder, 2-4% of carbon black, 4% of high-temperature reinforcing agent, 2% of Guangxi white mud and 3-5% of boron nitride; 3 to 6 percent of additional 5323 phenolic resin bonding agent. The raw materials are subjected to processes of fine powder mixing, coarse aggregate mixing, material mixing, molding, heat treatment, kiln discharge sorting and the like to obtain the finished sliding plate brick. The self-lubricating magnesium slag-stopping sliding plate brick added with the boron nitride has good high-temperature resistance, erosion resistance, scouring resistance and thermal shock stability, and the magnesium-chromium-aluminum sand which is originally used for smelting the industrial waste slag of the alloy is used as a main raw material, so that the production cost is greatly reduced.

Description

Self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride and preparation method thereof
Technical Field
The invention relates to the technical field of refractory materials, in particular to a self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride.
Background
With the development of refined steel refining technology and process, the converter slag stopping system becomes more and more important in the steel smelting process and becomes a key process for smelting refined steel. The device controls the slag discharging device in the converter tapping process, can effectively adjust the steel slag amount from the converter to a steel ladle, enables the smelting operation to be more easily controlled, improves the steelmaking production efficiency, and ensures the quality of fine steel.
The converter slag stopping system consists of an oil cylinder driving device, a mechanical part and a refractory material part (namely a steel tapping hole, an inner slag stopping sliding plate, an outer tap hole brick), wherein the slag stopping sliding plate bears the mechanical scouring and chemical erosion of molten steel and steel slag in the slag control process. In order to control the slag discharging amount in the converter tapping process, the slag blocking sliding plate needs front slag blocking and rear slag blocking, and the slag blocking sliding plate needs to have good wear resistance and high-temperature strength. Domestic slag stopping sliding plates mainly comprise: aluminum carbon, aluminum zirconium carbon and zirconium-inlaid sliding plates thereof; corundum and zirconium-containing raw materials and nano-grade N330 carbon black are generally selected, 5323 phenolic resin is used as a bonding agent, the raw materials are high in cost, and the raw materials are sintered at about 1550 ℃, so that the manufacturing cost is high, the environmental pollution is large, the energy consumption is large, and the method is not suitable for the current energy-saving and environment-friendly policy. Therefore, the raw material cost of the sliding plate is greatly reduced by adding the smelting alloy industrial waste residue (magnesia-chromite-alumina sand), and the high-performance magnesium sliding plate is provided.
Disclosure of Invention
In order to solve the existing problems, the invention provides a self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride, which has good high-temperature resistance, erosion resistance, scouring resistance and thermal shock stability.
The invention aims to provide a self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride, which comprises the following raw materials in percentage by weight: 20-25% of magnesia-chromite-alumina sand with the granularity of 0-1 mm, 18-20% of magnesia-chromite-alumina sand with the granularity of 1-3 mm, 22-25% of magnesia-chromite-alumina sand with the granularity of 3-5 mm, 12% of magnesia-zirconia sand fine powder and alpha-Al2O34-5% of micro powder, 1-3% of silicon carbide fine powder, 2-5% of metal silicon powder, 2-4% of carbon black, 4% of high-temperature reinforcing agent, 2% of Guangxi white mud and 3-5% of boron nitride; 3 to 6 percent of additional 5323 phenolic resin bonding agent.
Preferably, the magnesia-chromite-alumina sand comprises the following chemical components: al (Al)2O313.15% of (B), 4.36% of CaO, and Cr2O3Content of (3) 8.11%, Fe2O30.35% of (A), 72.82% of MgO, SiO2The content of (B) is 0.12%.
Preferably, the magnesium zircon sand fine powder comprises the following chemical components: CaO content 3.31%, Fe2O3Content of (3) is 0.37%, and content of MgO86.82% of SiO2Is 0.12%, ZrO2The content of (A) is 9.35%; the granularity of the fine magnesium-zirconium sand powder is 200 meshes.
Preferably, the alpha-Al2O3The micro powder comprises the following chemical components: al (Al)2O3Has a content of 99.32% and Na2O content of 0.07%, SiO2The content of (A) is 0.12%; the alpha-Al2O3The average particle size of the fine powder was 2 μm.
Preferably, the silicon carbide fine powder comprises the following chemical components: 95.15% of SiC, 0.31% of CaO and Fe2O3Is 0.17 percent, and the granularity of the silicon carbide fine powder is 325 meshes.
Preferably, the metal silicon powder comprises the following chemical components: 95.15% of Si, 0.31% of CaO and Fe2O3The content of (A) is 0.17%; the granularity of the metal silicon powder is 325 meshes.
Preferably, the carbon black has a brand number of N330, and the carbon black has an average particle size of 20 nm.
Preferably, the main component of the high-temperature reinforcing agent is boron glass powder, and the content of the boron glass powder in the high-temperature reinforcing agent is 93%; the particle size of the high-temperature reinforcing agent is 325 meshes.
Preferably, the particle size of the Guangxi white mud is 320 meshes; the particle size of the boron nitride is 325 meshes.
The invention also aims to provide a preparation method of the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride, which comprises the following steps:
(1) mixing fine powder: the fine powder of the magnesia-zirconia sand and the alpha-Al are mixed according to the weight percentage2O3Mixing the micro powder, the silicon carbide fine powder, the metal silicon powder, the carbon black, the high-temperature reinforcing agent, the Guangxi white mud and the boron nitride uniformly to prepare fine powder;
(2) mixing coarse aggregates: mixing magnesia-chromite-alumina sand with the granularity of 0-1 mm, magnesia-chromite-alumina sand with the granularity of 1-3 mm and magnesia-chromite-alumina sand with the granularity of 3-5 mm according to weight percentage to prepare coarse aggregate;
(3) mixing materials: dry-mixing the coarse aggregate prepared in the step (2) for 2-3 minutes by using a wet mill, then slowly adding 5323 phenolic resin binder according to the weight percentage, then adding the fine powder prepared in the step (1), mixing for 20-30 minutes, and discharging to obtain a mixture;
(4) molding: pressing the mixture prepared in the step (3) on a 630t electric spiral brick press to form a green brick;
(5) and (3) heat treatment: placing the green bricks obtained in the step (4) into a kiln for baking heat treatment, wherein the temperature in the kiln is 45 ℃ when the green bricks enter a kiln opening, and baking the green bricks for 9-11 hours at the temperature; controlling the temperature in the kiln to rise to 110 ℃, and baking for 15-17 hours at the temperature; controlling the temperature in the kiln to rise to 200 ℃, and baking for 16-18 hours at the temperature; obtaining a sliding plate brick;
(6) and (4) taking out of the kiln for sorting: and selecting qualified sliding plate bricks, and then polishing and packaging.
The invention has the advantages that: the boron nitride is added into the self-lubricating magnesium slag-stopping sliding plate brick, and the boron nitride has excellent oxidation resistance, erosion resistance and lubricity, so that the self-lubricating magnesium slag-stopping sliding plate brick added with the boron nitride has good erosion resistance, thermal shock resistance and self-lubricating property; because the magnesia-chromite-alumina sand is the industrial ferrochrome slag of ferrochrome, the self-lubricating magnesia slag-stopping sliding plate brick added with boron nitride effectively recycles the magnesia-chromite-alumina sand as particle aggregate, reduces the harm of the magnesia-chromite-alumina sand to the environment and also reduces the production cost; the magnesia-chromite-alumina sand has the advantages that the refractoriness is higher than 1790 ℃, the magnesia-chromite-alumina sand has excellent high-temperature resistance, the main phases of the magnesia-chromite-alumina sand are magnesia-chromite spinel, chrome corundum, calcium aluminate, composite magnesia-alumina-chrome high-temperature spinel and the like, wherein the chrome corundum has higher melting point and lower thermal expansion coefficient, so that the steel slag erosion resistance of the sliding brick is improved; the self-lubricating magnesium slag-stopping sliding plate brick added with the boron nitride generates magnesium aluminate spinel during preparation, and the magnesium aluminate spinel has high melting point, low expansion coefficient and excellent thermal shock resistance and erosion resistance, so that the magnesium aluminate spinel can be used for dissolving SiO in molten steel at high temperature2And CaO is adsorbed to generate high-viscosity substances such as MCS, CA2, CA6 and the like, so that the infiltration of molten steel and steel slag is reduced.
Detailed Description
First, it is to be noted that the features and advantages of the boron nitride-added self-lubricating magnesium slag trap tile of the present invention, and the like, are specifically illustrated by way of example, and all of the descriptions are intended to be illustrative only and should not be construed as limiting the invention in any way.
In order to avoid repetition, the technical parameters of the related raw materials or the manufacturing method related in the embodiments are uniformly described, and are not described again in the embodiments:
the magnesium-chromium-aluminum sand comprises the following chemical components: al (Al)2O313.15% of (B), 4.36% of CaO, and Cr2O3Content of (3) 8.11%, Fe2O30.35% of (A), 72.82% of MgO, SiO2The content of (B) is 0.12%.
The magnesium zircon sand fine powder comprises the following chemical components: CaO content 3.31%, Fe2O30.37% of (A), 86.82% of MgO, and SiO2Is 0.12%, ZrO2The content of (A) is 9.35%; the granularity of the fine magnesium-zirconium sand powder is 200 meshes.
The alpha-Al2O3The micro powder comprises the following chemical components: al (Al)2O3Has a content of 99.32% and Na2O content of 0.07%, SiO2The content of (A) is 0.12%; the alpha-Al2O3The average particle size of the fine powder was 2 μm.
The silicon carbide fine powder comprises the following chemical components: 95.15% of SiC, 0.31% of CaO and Fe2O3Is 0.17 percent, and the granularity of the silicon carbide fine powder is 325 meshes.
The metal silicon powder comprises the following chemical components: 95.15% of Si, 0.31% of CaO and Fe2O3The content of (A) is 0.17%; the granularity of the metal silicon powder is 325 meshes.
The grade of the carbon black is N330, and the average particle size of the carbon black is 20 nm.
The main component of the high-temperature reinforcing agent is boron glass powder, and the content of the boron glass powder in the high-temperature reinforcing agent is 93%; the particle size of the high-temperature reinforcing agent is 325 meshes.
The granularity of the Guangxi white mud is 320 meshes; the particle size of the boron nitride is 325 meshes.
The boron nitride-added self-lubricating magnesium slag runner tile of the present invention is illustrated by the example provided below.
Example 1
The self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride comprises the following raw materials in percentage by weight: 25% of magnesia-chromite-alumina sand with the granularity of 0-1 mm, 18% of magnesia-chromite-alumina sand with the granularity of 1-3 mm, 22% of magnesia-chromite-alumina sand with the granularity of 3-5 mm, 12% of magnesia-zirconia sand fine powder and alpha-Al2O34% of micro powder, 1% of silicon carbide fine powder, 5% of metal silicon powder, 4% of carbon black, 4% of high-temperature reinforcing agent, 2% of Guangxi white mud and 3% of boron nitride; 5 percent of phenolic resin bonding agent is additionally added.
The preparation method of the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride comprises the following steps:
(1) mixing fine powder: the fine powder of the magnesia-zirconia sand and the alpha-Al are mixed according to the weight percentage2O3Mixing the micro powder, the silicon carbide fine powder, the metal silicon powder, the carbon black, the high-temperature reinforcing agent, the Guangxi white mud and the boron nitride uniformly to prepare fine powder;
(2) mixing coarse aggregates: mixing magnesia-chromite-alumina sand with the granularity of 0-1 mm, magnesia-chromite-alumina sand with the granularity of 1-3 mm and magnesia-chromite-alumina sand with the granularity of 3-5 mm according to weight percentage to prepare coarse aggregate;
(3) mixing materials: dry-mixing the coarse aggregate prepared in the step (2) for 2 minutes by using a wet mill, then slowly adding 5323 phenolic resin binder according to the weight percentage, then adding the fine powder prepared in the step (1), mixing for 25 minutes, and discharging to obtain a mixture;
(4) molding: pressing the mixture prepared in the step (3) on a 630t electric spiral brick press to form a green brick;
(5) and (3) heat treatment: placing the green bricks obtained in the step (4) into a kiln for baking heat treatment, wherein the temperature in the kiln is 45 ℃ when the green bricks enter a kiln opening, and baking for 9 hours at the temperature; controlling the temperature in the kiln to rise to 110 ℃, and baking for 15 hours at the temperature; controlling the temperature in the kiln to rise to 200 ℃, and baking for 16 hours at the temperature; obtaining a sliding plate brick;
(6) and (4) taking out of the kiln for sorting: and selecting qualified sliding plate bricks, and then polishing and packaging.
Example 2
The raw materials and weight percentages of the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride in the embodiment are shown in table 1. The preparation method of the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride comprises the following steps:
(1) mixing fine powder: the fine powder of the magnesia-zirconia sand and the alpha-Al are mixed according to the weight percentage2O3Mixing the micro powder, the silicon carbide fine powder, the metal silicon powder, the carbon black, the high-temperature reinforcing agent, the Guangxi white mud and the boron nitride uniformly to prepare fine powder;
(2) mixing coarse aggregates: mixing magnesia-chromite-alumina sand with the granularity of 0-1 mm, magnesia-chromite-alumina sand with the granularity of 1-3 mm and magnesia-chromite-alumina sand with the granularity of 3-5 mm according to weight percentage to prepare coarse aggregate;
(3) mixing materials: dry-mixing the coarse aggregate prepared in the step (2) for 3 minutes by using a wet mill, then slowly adding 5323 phenolic resin binder according to the weight percentage, then adding the fine powder prepared in the step (1), mixing for 20 minutes, and discharging to obtain a mixture;
(4) molding: pressing the mixture prepared in the step (3) on a 630t electric spiral brick press to form a green brick;
(5) and (3) heat treatment: placing the green bricks obtained in the step (4) into a kiln for baking heat treatment, wherein the temperature in the kiln is 45 ℃ when the green bricks enter a kiln opening, and baking for 10 hours at the temperature; controlling the temperature in the kiln to rise to 110 ℃, and baking for 16 hours at the temperature; controlling the temperature in the kiln to rise to 200 ℃, and baking for 17 hours at the temperature; obtaining a sliding plate brick;
(6) and (4) taking out of the kiln for sorting: and selecting qualified sliding plate bricks, and then polishing and packaging.
Example 3
The raw materials and weight percentages of the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride in the embodiment are shown in table 1. The preparation method of the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride comprises the following steps:
(1) mixing fine powder: the fine powder of the magnesia-zirconia sand and the alpha-Al are mixed according to the weight percentage2O3Mixing the micro powder, the silicon carbide fine powder, the metal silicon powder, the carbon black, the high-temperature reinforcing agent, the Guangxi white mud and the boron nitride uniformly to prepare fine powder;
(2) mixing coarse aggregates: mixing magnesia-chromite-alumina sand with the granularity of 0-1 mm, magnesia-chromite-alumina sand with the granularity of 1-3 mm and magnesia-chromite-alumina sand with the granularity of 3-5 mm according to weight percentage to prepare coarse aggregate;
(3) mixing materials: dry-mixing the coarse aggregate prepared in the step (2) for 3 minutes by using a wet mill, then slowly adding 5323 phenolic resin binder according to the weight percentage, then adding the fine powder prepared in the step (1), mixing for 30 minutes, and discharging to obtain a mixture;
(4) molding: pressing the mixture prepared in the step (3) on a 630t electric spiral brick press to form a green brick;
(5) and (3) heat treatment: placing the green bricks obtained in the step (4) into a kiln for baking heat treatment, wherein the temperature in the kiln is 45 ℃ when the green bricks enter a kiln opening, and baking for 11 hours at the temperature; controlling the temperature in the kiln to rise to 110 ℃, and baking for 17 hours at the temperature; controlling the temperature in the kiln to rise to 200 ℃, and baking for 18 hours at the temperature; obtaining a sliding plate brick;
(6) and (4) taking out of the kiln for sorting: and selecting qualified sliding plate bricks, and then polishing and packaging.
Example 4
The raw materials and weight percentages of the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride in the embodiment are shown in table 1. The preparation method of the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride comprises the following steps:
(1) mixing fine powder: the fine powder of the magnesia-zirconia sand and the alpha-Al are mixed according to the weight percentage2O3Mixing the micro powder, the silicon carbide fine powder, the metal silicon powder, the carbon black, the high-temperature reinforcing agent, the Guangxi white mud and the boron nitride uniformly to prepare fine powder;
(2) mixing coarse aggregates: mixing magnesia-chromite-alumina sand with the granularity of 0-1 mm, magnesia-chromite-alumina sand with the granularity of 1-3 mm and magnesia-chromite-alumina sand with the granularity of 3-5 mm according to weight percentage to prepare coarse aggregate;
(3) mixing materials: dry-mixing the coarse aggregate prepared in the step (2) for 2 minutes by using a wet mill, then slowly adding 5323 phenolic resin binder according to the weight percentage, then adding the fine powder prepared in the step (1), mixing for 30 minutes, and discharging to obtain a mixture;
(4) molding: pressing the mixture prepared in the step (3) on a 630t electric spiral brick press to form a green brick;
(5) and (3) heat treatment: placing the green bricks obtained in the step (4) into a kiln for baking heat treatment, wherein the temperature in the kiln is 45 ℃ when the green bricks enter a kiln opening, and baking for 9 hours at the temperature; controlling the temperature in the kiln to rise to 110 ℃, and baking for 17 hours at the temperature; controlling the temperature in the kiln to rise to 200 ℃, and baking for 16 hours at the temperature; obtaining a sliding plate brick;
(6) and (4) taking out of the kiln for sorting: and selecting qualified sliding plate bricks, and then polishing and packaging.
TABLE 1 particle size and weight percent of the raw materials used in the above examples
Figure BDA0001660847750000061
TABLE 2 physicochemical Properties and average service life parameters of the slide bricks obtained in the above examples
Figure BDA0001660847750000062
According to the table 2, the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride prepared in each example has the service life of 13-14 times per set, and the total diameter expansion of a cast hole is 15.5 mm; the average rate of each erosion was 1.19 mm/time. Through comparison, measurement and analysis with the existing product, the average erosion rate of the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride is less than or equal to 2 mm/time and is 3.5 mm/time lower than that of the existing aluminum-zirconium-carbon product; meanwhile, the self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride has good crack conditions, only radioactive fine cracks of cast holes exist, the plate surface is smooth, and the phenomena of abnormal galling or abnormal erosion of the cast holes do not occur. The self-lubricating magnesium slag-stopping sliding plate brick added with the boron nitride has better self-lubricating property, erosion resistance, thermal shock resistance and high temperature resistance.

Claims (1)

1. A preparation method of a self-lubricating magnesium slag-stopping sliding plate brick added with boron nitride is characterized in that the sliding plate brick comprises the following raw materials in percentage by weight: 20-25% of magnesia-chromite-alumina sand with the granularity of 0-1 mm, 18-20% of magnesia-chromite-alumina sand with the granularity of 1-3 mm, 22-25% of magnesia-chromite-alumina sand with the granularity of 3-5 mm, 12% of magnesia-zirconia sand fine powder and alpha-Al2O34-5% of micro powder, 1-3% of silicon carbide fine powder, 2-5% of metal silicon powder, 2-4% of carbon black, 4% of high-temperature reinforcing agent, 2% of Guangxi white mud and 3-5% of boron nitride; 3% -6% of additional 5323 phenolic resin binder, and the preparation method comprises the following steps:
(1) mixing fine powder: the fine powder of the magnesia-zirconia sand and the alpha-Al are mixed according to the weight percentage2O3Mixing the micro powder, the silicon carbide fine powder, the metal silicon powder, the carbon black, the high-temperature reinforcing agent, the Guangxi white mud and the boron nitride uniformly to prepare fine powder;
(2) mixing coarse aggregates: mixing the magnesia-chromite-alumina sand, the magnesia-chromite-alumina sand and the magnesia-chromite-alumina sand according to the weight percentage to prepare coarse aggregate;
(3) mixing materials: dry-mixing the coarse aggregate prepared in the step (2) for 2-3 minutes by using a wet mill, then slowly adding 5323 phenolic resin binder according to the weight percentage, then adding the fine powder prepared in the step (1), mixing for 20-30 minutes, and discharging to obtain a mixture;
(4) molding: pressing the mixture prepared in the step (3) on a 630t electric spiral brick press to form a green brick;
(5) and (3) heat treatment: placing the green bricks obtained in the step (4) into a kiln for baking heat treatment, wherein the temperature in the kiln is 45 ℃ when the green bricks enter a kiln opening, and baking the green bricks for 9-11 hours at the temperature; controlling the temperature in the kiln to rise to 110 ℃, and baking for 15-17 hours at the temperature; controlling the temperature in the kiln to rise to 200 ℃, and baking for 16-18 hours at the temperature; obtaining a sliding plate brick;
(6) and (4) taking out of the kiln for sorting: selecting qualified sliding plate bricks, and then polishing and packaging;
the magnesium-chromium-aluminum sand comprises the following chemical components: al (Al)2O313.15% of (B), 4.36% of CaO, and Cr2O3Content of (3) 8.11%, Fe2O30.35% of (A), 72.82% of MgO, SiO2The content of (A) is 0.12%;
the magnesium zircon sand fine powder comprises the following chemical components: CaO content 3.31%, Fe2O30.37% of (A), 86.82% of MgO, and SiO2Is 0.12%, ZrO2The content of (A) is 9.35%; the granularity of the fine magnesium-zirconium sand powder is 200 meshes;
the alpha-Al2O3The micro powder comprises the following chemical components: al (Al)2O3Has a content of 99.32% and Na2O content of 0.07%, SiO2The content of (A) is 0.12%; the alpha-Al2O3The average particle size of the micro powder is 2 μm;
the silicon carbide fine powder comprises the following chemical components: 95.15% of SiC, 0.31% of CaO and Fe2O3The content of the silicon carbide fine powder is 0.17 percent, and the granularity of the silicon carbide fine powder is 325 meshes;
the metal silicon powder comprises the following chemical components: 95.15% of Si, 0.31% of CaO and Fe2O3The content of (A) is 0.17%; the granularity of the metal silicon powder is 325 meshes;
the grade of the carbon black is N330, and the average particle size of the carbon black is 20 nm;
the main component of the high-temperature reinforcing agent is boron glass powder, and the content of the boron glass powder in the high-temperature reinforcing agent is 93%; the particle size of the high-temperature reinforcing agent is 325 meshes;
the granularity of the Guangxi white mud is 320 meshes; the particle size of the boron nitride is 325 meshes.
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