CN111807819B - High-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel and preparation method thereof - Google Patents
High-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel and preparation method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of refractory materials, in particular to a high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel and a preparation method thereof. The raw materials comprise: 85-95 parts of fused magnesia, 1-3 parts of graphite, 2-3 parts of a bonding agent, 0.5-2 parts of carbon-containing resin powder, 0.1-2 parts of aluminum nitride fine powder and 1-6 parts of aluminum powder. The invention aims to provide a high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel and a preparation method thereof, and the prepared high-strength erosion-resistant low-carbon magnesia carbon brick has the characteristics of good high-temperature strength and good slag erosion resistance, can be widely applied to various steel ladles, and is particularly suitable for smelting environments for smelting stainless steel and ultra-low carbon steel.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel and a preparation method thereof.
Background
In the production of clean steel, external refining is one of important links influencing the cleanliness of steel, VOD and LF steel ladles are used for smelting clean steel, so that the working conditions of a furnace lining are more severe, molten steel generates mechanical scouring and erosion on refractory materials of the furnace lining, and meanwhile, constituent elements of the refractory materials are dissolved into the molten steel and generate chemical reaction with the molten steel, so that the cleanliness of the molten steel is reduced. The traditional low-carbon magnesia brick is influenced by low carbon content, the erosion resistance of molten steel and slag at high temperature is reduced, and the high-temperature erosion resistance of the molten steel and the slag is increased, so that the problem which needs to be overcome by the low-carbon magnesia brick is solved.
Therefore, aiming at the problems, the invention urgently needs to provide a high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel and a preparation method thereof.
Disclosure of Invention
The invention aims to provide a high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel and a preparation method thereof, and solves the technical problems that the traditional low-carbon magnesia brick is influenced by low carbon content and has low erosion resistance to molten steel and slag at high temperature in the prior art through the proportioning design of the high-strength erosion-resistant low-carbon magnesia carbon brick.
The invention provides a high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel, which comprises the following raw materials in parts by weight: 85-95 parts of fused magnesia, 1-3 parts of graphite, 2-3 parts of a bonding agent, 0.5-2 parts of carbon-containing resin powder, 0.1-2 parts of aluminum nitride fine powder and 1-6 parts of aluminum powder.
Preferably, the fused magnesia with the granularity of 200 meshes is 15 to 30 parts by weight; 10-20 parts of fused magnesia with the granularity of 0-1 mm; 25-35 parts of fused magnesia with the granularity of 1-3 mm; 25-30 parts of fused magnesia with the granularity of 3-5 mm.
Preferably, the fused magnesia has a magnesia content of > 96.0%.
Preferably, the aluminum nitride fine powder is nano-scale aluminum nitride, the average particle size of the aluminum nitride fine powder is 50nm, and the aluminum nitride content of the aluminum nitride fine powder is more than 99.9 percent.
Preferably, the graphite is composite graphite, the granularity of the graphite is 100-1200 meshes, and the carbon content in the graphite is more than 97.0 percent.
Preferably, the particle size of the aluminum powder is 325 mesh, and the aluminum content in the aluminum powder is > 98%.
Preferably, the binding agent is liquid resin, the viscosity of the liquid resin is 12000-15000cps/25 ℃, and the solid content of the liquid resin is 30-60%.
Preferably, the liquid resin is at least one of an epoxy resin or a polyurethane resin.
The invention also provides a preparation method of the high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel, which comprises the following preparation steps:
weighing fused magnesia, graphite, a bonding agent, carbon-containing resin powder, aluminum nitride fine powder and aluminum powder according to the proportion respectively;
taking out part of the fused magnesia, mixing the fused magnesia with the aluminum nitride fine powder, the aluminum powder and the carbon-containing resin powder, and obtaining co-milled powder after vibration milling;
adopting a high-speed constant-temperature mulling process for mulling, dry-mixing the rest fused magnesia, sequentially adding a binding agent, graphite and milled powder after dry-mixing, and mixing to obtain a mixture;
putting the mixture into a mould, and pressing and forming to obtain a brick blank;
and carrying out heat treatment on the green brick, and obtaining the high-strength corrosion-resistant low-carbon magnesia carbon brick after the heat treatment.
Preferably, in the comulled powder, the fused magnesia has a particle size of 200 mesh;
in the obtained brick blank, by mass, 85-95 parts of fused magnesia, 1-3 parts of graphite, 2-3 parts of a bonding agent, 0.5-2 parts of carbon-containing resin powder, 0.1-2 parts of aluminum nitride fine powder and 1-6 parts of aluminum powder;
15-30 parts of fused magnesia with the granularity of 200 meshes in the fused magnesia by mass; 10-20 parts of fused magnesia with the granularity of 0-1 mm; 25-35 parts of fused magnesia with the granularity of 1-3 mm; 25-30 parts of fused magnesia with the granularity of 3-5 mm;
when the binding agent is added, the adding time is 2-3 minutes;
adding a bonding agent, and then adding graphite for 3-5 minutes;
after adding graphite, adding the prepared co-milled powder, mixing for 15-25 minutes, and discharging after the materials are qualified;
and (3) carrying out heat treatment on the green brick by using a tunnel kiln, wherein the heat treatment time is more than or equal to 16 hours, the baking temperature is more than or equal to 180 ℃, and the baking time is more than or equal to 10 hours.
Compared with the prior art, the high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel provided by the invention has the following advantages:
1. the high-strength corrosion-resistant low-carbon magnesia carbon brick provided by the invention is added with aluminum nitride, the aluminum nitride can be stabilized to 2200 ℃ at most, the room temperature strength is high, and the strength is slowly reduced along with the temperature rise. The thermal conductivity is good, the thermal expansion coefficient is small, and the material is a good thermal shock resistant material; the aluminum nitride and the aluminum powder are added in a compounding way, so that MAlON can be formed in the using process, and the high-temperature strength and the high-temperature corrosion resistance of the product are improved.
2. According to the preparation method of the high-strength erosion-resistant low-carbon magnesia carbon brick, the composite graphite is added into the low-carbon magnesia carbon brick, and is uniformly dispersed through a high-speed constant-temperature mixing process, so that pores with uniform distribution and fine size are formed in the use of products, elastic strain energy can be well absorbed and dissipated, the damage effect of thermal stress on materials is relieved, and the thermal shock stability of the low-carbon magnesia carbon brick is improved.
3. The high-strength corrosion-resistant low-carbon magnesia carbon brick prepared by the invention has the characteristics of good high-temperature strength and good slag corrosion resistance, can be widely applied to various steel ladles, and is particularly suitable for smelting environments for smelting stainless steel and ultra-low carbon steel.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of the preparation method of the high-strength erosion-resistant low-carbon magnesia carbon brick of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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 a high-strength high-corrosion low-carbon magnesia carbon brick which comprises the following raw materials in parts by weight: 85-95 parts of fused magnesia, 1-3 parts of graphite, 2-3 parts of a bonding agent, 0.5-2 parts of carbon-containing resin powder, 0.1-2 parts of aluminum nitride fine powder and 1-6 parts of aluminum powder.
Specifically, the fused magnesia with the granularity of 200 meshes is 15 to 30 parts by weight; 10-20 parts of fused magnesia with the granularity of 0-1 mm; 25-35 parts of fused magnesia with the granularity of 1-3 mm; 25-30 parts of fused magnesia with the granularity of 3-5 mm.
Specifically, the content of magnesium oxide in the fused magnesia is more than 96.0 percent.
Specifically, the aluminum nitride fine powder is nano-scale aluminum nitride, the average particle size of the aluminum nitride fine powder is 50nm, and the aluminum nitride content of the aluminum nitride fine powder is more than 99.9%.
Specifically, the graphite is composite graphite, the granularity of the graphite is 100-1200 meshes, and the carbon content in the graphite is more than 97.0 percent.
Specifically, the particle size of the aluminum powder is 325 meshes, and the aluminum content in the aluminum powder is more than 98 percent.
Specifically, the binding agent is liquid resin, the viscosity of the liquid resin is 12000-15000cps/25 ℃, and the solid content of the liquid resin is 30-60%.
Specifically, the liquid resin is at least one of an epoxy resin or a polyurethane resin.
The invention also provides a preparation method of the high-strength corrosion-resistant low-carbon magnesia carbon brick, which comprises the following preparation steps:
weighing fused magnesia, graphite, a bonding agent, carbon-containing resin powder, aluminum nitride fine powder and aluminum powder according to the proportion respectively;
taking out part of the fused magnesia, mixing the fused magnesia with the aluminum nitride fine powder, the aluminum powder and the carbon-containing resin powder, and obtaining co-milled powder after vibration milling;
adopting a high-speed constant-temperature mulling process for mulling, dry-mixing the rest fused magnesia, sequentially adding a binding agent, graphite and milled powder after dry-mixing, and mixing to obtain a mixture;
putting the mixture into a mould, and pressing and forming to obtain a brick blank;
and carrying out heat treatment on the green brick, and obtaining the high-strength corrosion-resistant low-carbon magnesia carbon brick after the heat treatment.
Specifically, in the cofeed powder, the fused magnesia has a particle size of 200 mesh;
in the obtained brick blank, by mass, 85-95 parts of fused magnesia, 1-3 parts of graphite, 2-3 parts of a bonding agent, 0.5-2 parts of carbon-containing resin powder, 0.1-2 parts of aluminum nitride fine powder and 1-6 parts of aluminum powder;
15-30 parts of fused magnesia with the granularity of 200 meshes in the fused magnesia by mass; 10-20 parts of fused magnesia with the granularity of 0-1 mm; 25-35 parts of fused magnesia with the granularity of 1-3 mm; 25-30 parts of fused magnesia with the granularity of 3-5 mm;
when the binding agent is added, the adding time is 2-3 minutes;
adding a bonding agent, and then adding graphite for 3-5 minutes;
after adding graphite, adding the prepared co-milled powder, mixing for 15-25 minutes, and discharging after the materials are qualified;
and (3) carrying out heat treatment on the green brick by using a tunnel kiln, wherein the heat treatment time is more than or equal to 16 hours, the baking temperature is more than or equal to 180 ℃, and the baking time is more than or equal to 10 hours.
The high-strength corrosion-resistant low-carbon magnesia carbon brick has the action mechanism that:
in the process of preparing the low-carbon magnesia carbon brick, aluminum nitride is added, the aluminum nitride can be stabilized to 2200 ℃ at most, the room temperature strength is high, and the strength is slowly reduced along with the temperature rise. The thermal conductivity is good, the thermal expansion coefficient is small, and the material is a good thermal shock resistant material; the aluminum nitride and the aluminum powder are added in a compounding way, so that MAlON can be formed in the using process, and the high-temperature strength and the high-temperature corrosion resistance of the product are improved.
The composite graphite is added into the low-carbon magnesia carbon brick, and is uniformly dispersed through a high-speed constant-temperature mulling process, so that pores with uniform distribution and fine size are formed in the use of a product, elastic strain energy can be well absorbed and dissipated, the damage effect of thermal stress on the material is relieved, and the thermal shock stability of the low-carbon magnesia carbon brick is improved.
In the preparation process of the low-carbon magnesia carbon brick, the cofying powder needs to be prepared in advance, the aluminum nitride fine powder, the aluminum powder and the carbon-containing resin powder in the cofying powder are used as additives with key effects in the product, but the adding amount is less, the nonuniformity of the directly added mixed material is increased, the uniformity of the additives in the mixed material is improved by preparing the cofying powder, and the stability of the product is improved.
Example one
Preparation of sample one:
according to the mass fraction, 5 parts of fused magnesia with the granularity of 200 meshes, 0.3 part of fine aluminum nitride powder, 1.5 parts of aluminum powder and 1 part of carbon-containing resin powder are vibrated and ground to obtain co-ground powder;
20.7 parts of fused magnesia with the granularity of 200 meshes, 15 parts of fused magnesia with the granularity of 0-1mm, 30 parts of fused magnesia with the granularity of 1-3mm and 25 parts of fused magnesia with the granularity of 3-5mm are dry-mixed, and after the dry-mixing, 2.8 parts of bonding agent is slowly added in the dry-mixing process for 2-3 minutes; adding a bonding agent, then adding 1.5 parts of graphite, and performing mixing by adopting a high-speed constant-temperature mixing process, wherein the time for adding the graphite is 3-5 minutes; after adding graphite, adding the prepared co-milled powder, mixing for 15-25 minutes, and discharging after the materials are qualified; putting the qualified mixture into a die, and pressing and forming to obtain a brick blank; and (3) carrying out heat treatment on the green brick by using a tunnel kiln, wherein the heat treatment time is more than or equal to 16 hours, the baking temperature is more than or equal to 180 ℃, the baking time is more than or equal to 10 hours, and after the heat treatment, the high-strength corrosion-resistant low-carbon magnesia carbon brick, namely the sample I, is obtained.
Wherein, the content of magnesium oxide in the fused magnesia is more than 96.0 percent; the aluminum nitride fine powder is nano-grade aluminum nitride, the average particle size of the aluminum nitride fine powder is 50nm, and the aluminum nitride content of the aluminum nitride fine powder is more than 99.9 percent; the graphite is composite graphite, the granularity of the graphite is 100-1200 meshes, and the carbon content in the graphite is more than 97.0 percent; the granularity of the aluminum powder is 325 meshes, and the aluminum content in the aluminum powder is more than 98 percent; the bonding agent is liquid resin, the viscosity of the liquid resin is 12000-15000cps/25 ℃, and the solid content of the liquid resin is 30-60%; the liquid resin is an epoxy resin.
In the first sample of this example, MgO is greater than or equal to 88%, and C is less than or equal to 4%. The volume density after baking at 200 ℃ is more than or equal to 3.17g/cm3The apparent porosity (200 ℃ multiplied by 24 h) is less than or equal to 3.0 percent, the compressive strength (200 ℃ multiplied by 24 h) is more than or equal to 80MPa, and the high-temperature rupture strength (1400 ℃ multiplied by 0.5 h) is more than or equal to 15 MPa. The product is used on 90-ton VOD ladle in a certain steel mill, the service life is prolonged from 9 furnaces to more than 18 furnaces on average, and the stability of the service life is greatly improved. Compared with the existing ladle, the service life of the ladle is greatly influenced by steelmaking conditions, the fluctuation range of the product service life is from 4 to 13 furnaces, the service life of the ladle is unstable, the steel mill is difficult to dispatch, hidden dangers are brought to safe production, the ladle missing accidents are frequent, the service life of a sample ladle of the embodiment is stable, and the ladle missing accident does not occur once again.
The prepared sample I is improved in compression strength and high-temperature rupture strength limitation due to the addition of the aluminum nitride and the aluminum powder, so that MAlON can be formed in the using process due to the composite addition of the aluminum nitride and the aluminum powder, and the high-temperature strength and high-temperature corrosion resistance of the product are improved.
The high-speed constant-temperature mulling process is adopted, so that the high-speed constant-temperature mulling process is uniformly dispersed, pores which are uniformly distributed and have fine sizes are formed in the use of products, elastic strain energy can be well absorbed and dissipated, the destructive effect of thermal stress on materials is relieved, and the thermal shock stability of the low-carbon magnesia carbon brick is improved.
Example two
And the preparation process of the second sample:
according to the mass fraction, 5 parts of fused magnesia with the granularity of 200 meshes, 0.3 part of fine aluminum nitride powder, 3 parts of aluminum powder and 1 part of carbon-containing resin powder are vibrated and ground to obtain co-ground powder;
19.2 parts of fused magnesia with the granularity of 200 meshes, 15 parts of fused magnesia with the granularity of 0-1mm, 30 parts of fused magnesia with the granularity of 1-3mm and 25 parts of fused magnesia with the granularity of 3-5mm are dry-mixed, and after the dry-mixing, 2.8 parts of bonding agent is slowly added in the dry-mixing process for 2-3 minutes; adding a bonding agent, then adding 1.5 parts of graphite, and performing mixing by adopting a high-speed constant-temperature mixing process, wherein the time for adding the graphite is 3-5 minutes; after adding graphite, adding the prepared co-milled powder, mixing for 15-25 minutes, and discharging after the materials are qualified; putting the qualified mixture into a die, and pressing and forming to obtain a brick blank; and (3) carrying out heat treatment on the green brick by using a tunnel kiln, wherein the heat treatment time is more than or equal to 16 hours, the baking temperature is more than or equal to 180 ℃, the baking time is more than or equal to 10 hours, and after the heat treatment, the high-strength corrosion-resistant low-carbon magnesia carbon brick, namely the sample I, is obtained.
Wherein, the content of magnesium oxide in the fused magnesia is more than 96.0 percent; the aluminum nitride fine powder is nano-grade aluminum nitride, the average particle size of the aluminum nitride fine powder is 50nm, and the aluminum nitride content of the aluminum nitride fine powder is more than 99.9 percent; the graphite is composite graphite, the granularity of the graphite is 100-1200 meshes, and the carbon content in the graphite is more than 97.0 percent; the granularity of the aluminum powder is 325 meshes, and the aluminum content in the aluminum powder is more than 98 percent; the bonding agent is liquid resin, the viscosity of the liquid resin is 12000-15000cps/25 ℃, and the solid content of the liquid resin is 30-60%; the liquid resin is an epoxy resin.
In the second sample of this example, MgO is greater than or equal to 88% and C is less than or equal to 4%. The volume density after baking at 200 ℃ is more than or equal to 3.17g/cm3The apparent porosity (200 ℃ multiplied by 24 h) is less than or equal to 3.0 percent, the compressive strength (200 ℃ multiplied by 24 h) is more than or equal to 80MPa, and the high-temperature rupture strength (1400 ℃ multiplied by 0.5 h) is more than or equal to 15 MPa. The product is used on 90-ton VOD ladle in a certain steel mill, the service life of the product is prolonged from 9 furnaces to more than 18 furnaces on average, and the use is very stable. Compared with the existing ladle, the service life of the ladle is greatly influenced by steelmaking conditions, the fluctuation range of the product service life is from 4 to 13 furnaces, the service life of the ladle is unstable, the steel mill is difficult to dispatch, hidden dangers are brought to safe production, the ladle missing accidents are frequent, the service life of a sample ladle of the embodiment is stable, and the ladle missing accident does not occur once again.
And the prepared sample II is improved in the limitations of compressive strength and high-temperature rupture strength due to the addition of the aluminum nitride and the aluminum powder, so that MAlON can be formed in the using process due to the composite addition of the aluminum nitride and the aluminum powder, and the high-temperature strength and the high-temperature corrosion resistance of the product are improved.
The high-speed constant-temperature mulling process is adopted, so that the high-speed constant-temperature mulling process is uniformly dispersed, pores which are uniformly distributed and have fine sizes are formed in the use of products, elastic strain energy can be well absorbed and dissipated, the destructive effect of thermal stress on materials is relieved, and the thermal shock stability of the low-carbon magnesia carbon brick is improved.
EXAMPLE III
Preparation of sample three:
according to the mass fraction, 5 parts of fused magnesia with the granularity of 200 meshes, 0.5 part of fine aluminum nitride powder, 1 part of aluminum powder and 1 part of carbon-containing resin powder are vibrated and ground to obtain co-ground powder;
21 parts of fused magnesia with the granularity of 200 meshes, 15 parts of fused magnesia with the granularity of 0-1mm, 30 parts of fused magnesia with the granularity of 1-3mm and 25 parts of fused magnesia with the granularity of 3-5mm are dry-mixed, and after the dry-mixing, 2.8 parts of bonding agent is slowly added in the dry-mixing process for 2-3 minutes; adding a bonding agent, then adding 1.5 parts of graphite, and performing mixing by adopting a high-speed constant-temperature mixing process, wherein the time for adding the graphite is 3-5 minutes; after adding graphite, adding the prepared co-milled powder, mixing for 15-25 minutes, and discharging after the materials are qualified; putting the qualified mixture into a die, and pressing and forming to obtain a brick blank; and (3) carrying out heat treatment on the green brick by using a tunnel kiln, wherein the heat treatment time is more than or equal to 16 hours, the baking temperature is more than or equal to 180 ℃, the baking time is more than or equal to 10 hours, and after the heat treatment, the high-strength corrosion-resistant low-carbon magnesia carbon brick, namely the sample I, is obtained.
Wherein, the content of magnesium oxide in the fused magnesia is more than 96.0 percent; the aluminum nitride fine powder is nano-grade aluminum nitride, the average particle size of the aluminum nitride fine powder is 50nm, and the aluminum nitride content of the aluminum nitride fine powder is more than 99.9 percent; the graphite is composite graphite, the granularity of the graphite is 100-1200 meshes, and the carbon content in the graphite is more than 97.0 percent; the granularity of the aluminum powder is 325 meshes, and the aluminum content in the aluminum powder is more than 98 percent; the bonding agent is liquid resin, the viscosity of the liquid resin is 12000-15000cps/25 ℃, and the solid content of the liquid resin is 30-60%; the liquid resin is an epoxy resin.
In sample three of this example, MgO is greater than or equal to 88%, and C is less than or equal to 4%. The volume density after baking at 200 ℃ is more than or equal to 3.17g/cm3The apparent porosity (200 ℃ multiplied by 24 h) is less than or equal to 3.0 percent, the compressive strength (200 ℃ multiplied by 24 h) is more than or equal to 80MPa, and the high-temperature rupture strength (1400 ℃ multiplied by 0.5 h) is more than or equal to 15 MPa. The product is used on 90-ton VOD ladle in a certain steel mill, the service life of the product is prolonged from 9 furnaces to more than 18 furnaces on average, and the use is very stable. Compared with the existing ladle, the service life of the ladle is greatly influenced by steelmaking conditions, the fluctuation range of the product service life is from 4 to 13 furnaces, the service life of the ladle is unstable, the steel mill is difficult to dispatch, hidden dangers are brought to safe production, the ladle missing accidents are frequent, the service life of a sample ladle of the embodiment is stable, and the ladle missing accident does not occur once again.
And the prepared sample III is improved in the limitations of compressive strength and high-temperature rupture strength due to the addition of the aluminum nitride and the aluminum powder, so that MAlON can be formed in the using process due to the composite addition of the aluminum nitride and the aluminum powder, and the high-temperature strength and the high-temperature corrosion resistance of the product are improved.
The high-speed constant-temperature mulling process is adopted, so that the high-speed constant-temperature mulling process is uniformly dispersed, pores which are uniformly distributed and have fine sizes are formed in the use of products, elastic strain energy can be well absorbed and dissipated, the destructive effect of thermal stress on materials is relieved, and the thermal shock stability of the low-carbon magnesia carbon brick is improved.
Example four
Preparation of sample four:
according to the mass fraction, 5 parts of fused magnesia with the granularity of 200 meshes, 0.5 part of fine aluminum nitride powder, 2 parts of aluminum powder and 1 part of carbon-containing resin powder are vibrated and ground to obtain co-ground powder;
20 parts of fused magnesia with the granularity of 200 meshes, 15 parts of fused magnesia with the granularity of 0-1mm, 30 parts of fused magnesia with the granularity of 1-3mm and 25 parts of fused magnesia with the granularity of 3-5mm are dry-mixed, and after the dry-mixing, 2.8 parts of bonding agent is slowly added in the dry-mixing process for 2-3 minutes; adding a bonding agent, then adding 1.5 parts of graphite, and performing mixing by adopting a high-speed constant-temperature mixing process, wherein the time for adding the graphite is 3-5 minutes; after adding graphite, adding the prepared co-milled powder, mixing for 15-25 minutes, and discharging after the materials are qualified; putting the qualified mixture into a die, and pressing and forming to obtain a brick blank; and (3) carrying out heat treatment on the green brick by using a tunnel kiln, wherein the heat treatment time is more than or equal to 16 hours, the baking temperature is more than or equal to 180 ℃, the baking time is more than or equal to 10 hours, and after the heat treatment, the high-strength corrosion-resistant low-carbon magnesia carbon brick, namely the sample I, is obtained.
Wherein, the content of magnesium oxide in the fused magnesia is more than 96.0 percent; the aluminum nitride fine powder is nano-grade aluminum nitride, the average particle size of the aluminum nitride fine powder is 50nm, and the aluminum nitride content of the aluminum nitride fine powder is more than 99.9 percent; the graphite is composite graphite, the granularity of the graphite is 100-1200 meshes, and the carbon content in the graphite is more than 97.0 percent; the granularity of the aluminum powder is 325 meshes, and the aluminum content in the aluminum powder is more than 98 percent; the bonding agent is liquid resin, the viscosity of the liquid resin is 12000-15000cps/25 ℃, and the solid content of the liquid resin is 30-60%; the liquid resin is an epoxy resin.
In sample four of this example, MgO is greater than or equal to 88%, and C is less than or equal to 4%. The volume density after baking at 200 ℃ is more than or equal to 3.17g/cm3The apparent porosity (200 ℃ multiplied by 24 h) is less than or equal to 3.0 percent, the compressive strength (200 ℃ multiplied by 24 h) is more than or equal to 80MPa, and the high-temperature rupture strength (1400 ℃ multiplied by 0.5 h) is more than or equal to 15 MPa. The product is used on 90-ton VOD ladle in a certain steel mill, the service life of the product is prolonged from 9 furnaces to more than 18 furnaces on average, and the use is very stable. Compared with the existing ladle, the service life of the ladle is greatly influenced by steelmaking conditions, the fluctuation range of the product service life is from 4 to 13 furnaces, the service life of the ladle is unstable, the steel mill is difficult to dispatch, hidden dangers are brought to safe production, the ladle missing accidents are frequent, the service life of a sample ladle of the embodiment is stable, and the ladle missing accident does not occur once again.
And the prepared sample IV has improved compression strength and high-temperature rupture strength due to the addition of the aluminum nitride and the aluminum powder, so that MAlON can be formed in the use process due to the composite addition of the aluminum nitride and the aluminum powder, and the high-temperature strength and the high-temperature corrosion resistance of the product are improved.
The high-speed constant-temperature mulling process is adopted, so that the high-speed constant-temperature mulling process is uniformly dispersed, pores which are uniformly distributed and have fine sizes are formed in the use of products, elastic strain energy can be well absorbed and dissipated, the destructive effect of thermal stress on materials is relieved, and the thermal shock stability of the low-carbon magnesia carbon brick is improved.
EXAMPLE five
Preparation of sample five:
according to the mass fraction, 5 parts of fused magnesia with the granularity of 200 meshes, 0.5 part of fine aluminum nitride powder, 3 parts of aluminum powder and 1 part of carbon-containing resin powder are vibrated and ground to obtain co-ground powder;
19 parts of fused magnesia with the granularity of 200 meshes, 15 parts of fused magnesia with the granularity of 0-1mm, 30 parts of fused magnesia with the granularity of 1-3mm and 25 parts of fused magnesia with the granularity of 3-5mm are dry-mixed, and after the dry-mixing, 2.8 parts of bonding agent is slowly added in the dry-mixing process for 2-3 minutes; adding a bonding agent, then adding 1.5 parts of graphite, and performing mixing by adopting a high-speed constant-temperature mixing process, wherein the time for adding the graphite is 3-5 minutes; after adding graphite, adding the prepared co-milled powder, mixing for 15-25 minutes, and discharging after the materials are qualified; putting the qualified mixture into a die, and pressing and forming to obtain a brick blank; and (3) carrying out heat treatment on the green brick by using a tunnel kiln, wherein the heat treatment time is more than or equal to 16 hours, the baking temperature is more than or equal to 180 ℃, the baking time is more than or equal to 10 hours, and after the heat treatment, the high-strength corrosion-resistant low-carbon magnesia carbon brick, namely the sample I, is obtained.
Wherein, the content of magnesium oxide in the fused magnesia is more than 96.0 percent; the aluminum nitride fine powder is nano-grade aluminum nitride, the average particle size of the aluminum nitride fine powder is 50nm, and the aluminum nitride content of the aluminum nitride fine powder is more than 99.9 percent; the graphite is composite graphite, the granularity of the graphite is 100-1200 meshes, and the carbon content in the graphite is more than 97.0 percent; the granularity of the aluminum powder is 325 meshes, and the aluminum content in the aluminum powder is more than 98 percent; the bonding agent is liquid resin, the viscosity of the liquid resin is 12000-15000cps/25 ℃, and the solid content of the liquid resin is 30-60%; the liquid resin is an epoxy resin.
In sample five of this example, MgO is greater than or equal to 88%, and C is less than or equal to 4%. The volume density after baking at 200 ℃ is more than or equal to 3.17g/cm3The apparent porosity (200 ℃ multiplied by 24 h) is less than or equal to 3.0 percent, the compressive strength (200 ℃ multiplied by 24 h) is more than or equal to 80MPa, and the high-temperature rupture strength (1400 ℃ multiplied by 0.5 h) is more than or equal to 15 MPa. The product is used on 90-ton VOD ladle in a certain steel mill, the service life of the product is prolonged from 9 furnaces to more than 18 furnaces on average, and the use is very stable. Compared with the existing ladle, the service life of the ladle is greatly influenced by steelmaking conditions, the fluctuation range of the product service life is from 4 to 13 furnaces, the service life of the ladle is unstable, the steel mill is difficult to dispatch, hidden dangers are brought to safe production, the ladle missing accidents are frequent, the service life of a sample ladle of the embodiment is stable, and the ladle missing accident does not occur once again.
And the prepared sample V is improved in the limitations of compressive strength and high-temperature rupture strength due to the addition of the aluminum nitride and the aluminum powder, so that MAlON can be formed in the using process due to the composite addition of the aluminum nitride and the aluminum powder, and the high-temperature strength and the high-temperature corrosion resistance of the product are improved.
The high-speed constant-temperature mulling process is adopted, so that the high-speed constant-temperature mulling process is uniformly dispersed, pores which are uniformly distributed and have fine sizes are formed in the use of products, elastic strain energy can be well absorbed and dissipated, the destructive effect of thermal stress on materials is relieved, and the thermal shock stability of the low-carbon magnesia carbon brick is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. The high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel is characterized in that: the raw materials comprise the following components in parts by weight: 85-95 parts of fused magnesia, 1-3 parts of graphite, 2-3 parts of a bonding agent, 0.5-2 parts of carbon-containing resin powder, 0.1-2 parts of aluminum nitride fine powder and 1-6 parts of aluminum powder; the aluminum nitride fine powder is nano-grade aluminum nitride, the average particle size of the aluminum nitride fine powder is 50nm, and the aluminum nitride content of the aluminum nitride fine powder is more than 99.9 percent; the granularity of the aluminum powder is 325 meshes, and the aluminum content in the aluminum powder is more than 98 percent; the C of the low-carbon magnesia carbon brick is less than or equal to 4 percent; the fused magnesia with the granularity of 200 meshes is 15-30 parts by mass; 10-20 parts of fused magnesia with the granularity of 0-1 mm; 25-35 parts of fused magnesia with the granularity of 1-3 mm; 25-30 parts of fused magnesia with the granularity of 3-5 mm;
the graphite is composite graphite, the granularity of the graphite is 100-1200 meshes, and the carbon content in the graphite is more than 97.0 percent.
2. The high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel according to claim 1, characterized in that: the content of magnesium oxide in the fused magnesia is more than 96.0 percent.
3. The high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel as claimed in claim 2, wherein: the binding agent is liquid resin, the viscosity of the liquid resin is 12000-15000cps/25 ℃, and the solid content of the liquid resin is 30-60%.
4. The high-strength high-erosion low-carbon magnesia carbon brick for smelting stainless steel according to claim 3, characterized in that: the liquid resin is at least one of epoxy resin or polyurethane resin.
5. A method for preparing high-strength high-erosion low-carbon magnesia carbon bricks for smelting stainless steel according to any one of claims 1 to 4, which is characterized by comprising the following steps: the preparation method comprises the following preparation steps:
weighing fused magnesia, graphite, a bonding agent, carbon-containing resin powder, aluminum nitride fine powder and aluminum powder according to the proportion respectively;
taking out part of the fused magnesia, mixing the fused magnesia with the aluminum nitride fine powder, the aluminum powder and the carbon-containing resin powder, and obtaining co-milled powder after vibration milling;
adopting a high-speed constant-temperature mulling process for mulling, dry-mixing the rest fused magnesia, sequentially adding a binding agent, graphite and milled powder after dry-mixing, and mixing to obtain a mixture;
putting the mixture into a mould, and pressing and forming to obtain a brick blank;
carrying out heat treatment on the green brick to obtain a high-strength erosion-resistant low-carbon magnesia carbon brick;
in the co-milling powder, the granularity of the fused magnesia is 200 meshes;
in the obtained brick blank, by mass, 85-95 parts of fused magnesia, 1-3 parts of graphite, 2-3 parts of a bonding agent, 0.5-2 parts of carbon-containing resin powder, 0.1-2 parts of aluminum nitride fine powder and 1-6 parts of aluminum powder;
15-30 parts of fused magnesia with the granularity of 200 meshes in the fused magnesia by mass; 10-20 parts of fused magnesia with the granularity of 0-1 mm; 25-35 parts of fused magnesia with the granularity of 1-3 mm; 25-30 parts of fused magnesia with the granularity of 3-5 mm;
when the binding agent is added, the adding time is 2-3 minutes;
adding a bonding agent, and then adding graphite for 3-5 minutes;
after adding graphite, adding the prepared co-milled powder, mixing for 15-25 minutes, and discharging after the materials are qualified;
carrying out heat treatment on the green brick by using a tunnel kiln, wherein the heat treatment time is more than or equal to 16 hours, the baking temperature is more than or equal to 180 ℃, and the baking time is more than or equal to 10 hours; the aluminum nitride fine powder is nano-grade aluminum nitride, the average particle size of the aluminum nitride fine powder is 50nm, and the aluminum nitride content of the aluminum nitride fine powder is more than 99.9 percent; the granularity of the aluminum powder is 325 meshes, and the C of the low-carbon magnesia carbon brick is less than or equal to 4 percent.
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| CN112358305A (en) * | 2020-11-17 | 2021-02-12 | 武汉钢铁集团耐火材料有限责任公司 | Electric furnace ladle wall magnesia carbon brick capable of preventing longitudinal cracking and preparation process thereof |
| CN112408948A (en) * | 2020-12-04 | 2021-02-26 | 北京利尔高温材料股份有限公司 | Magnesium carbon brick for smelting low-alkalinity slag |
| CN112457032A (en) * | 2021-01-22 | 2021-03-09 | 北京利尔高温材料股份有限公司 | Tundish pocket brick cup containing reclaimed materials and preparation method thereof |
| CN114014638A (en) * | 2021-09-10 | 2022-02-08 | 河南竹林庆州耐火材料有限公司 | Preparation method of magnesia carbon brick capable of effectively resisting intense erosion of titanium-rich slag |
| CN117069480A (en) * | 2023-08-15 | 2023-11-17 | 大石桥市冠诚耐火材料有限公司 | Low-carbon magnesia carbon brick for producing stainless steel by converter and preparation process thereof |
| CN117303862B (en) * | 2023-10-24 | 2024-05-03 | 大城县宏大高温材料有限公司 | Long-service-life tundish dry vibrating material and preparation method thereof |
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| CN109020571A (en) * | 2018-08-27 | 2018-12-18 | 海城利尔麦格西塔材料有限公司 | A kind of anti-erosion magnesia carbon brick and preparation method thereof |
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| CN106365617A (en) * | 2016-08-22 | 2017-02-01 | 浙江金汇华特种耐火材料有限公司 | Anti-oxidizing regenerated magnesia carbon brick used in slag line position and production method therefor |
| CN108017376A (en) * | 2017-11-22 | 2018-05-11 | 海城利尔麦格西塔材料有限公司 | A kind of magnesia carbon brick and its production method |
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