CN112125650A - Magnesia carbon brick for vicinity of electric furnace door and preparation method thereof - Google Patents
Magnesia carbon brick for vicinity of electric furnace door and preparation method thereof Download PDFInfo
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63448—Polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63472—Condensation polymers of aldehydes or ketones
- C04B35/63476—Phenol-formaldehyde condensation polymers
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
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Abstract
The invention relates to a magnesia carbon brick for the vicinity of an electric furnace door and a preparation method thereof, and the prepared magnesia carbon brick is prepared from the following raw materials in parts by weight: 20-30 parts of fused magnesia with the granularity of not less than 3mm and less than 5mm, 20-40 parts of fused magnesia with the granularity of not less than 1mm and less than 3mm, 10-20 parts of fused magnesia with the granularity of not less than 0.1mm and less than 1mm, 5-20 parts of fused magnesia fine powder with the granularity of less than 0.0.088mm, 12-16 parts of flaky graphite, 1-3 parts of phenolic resin bonding agent, 1-6 parts of additive, wherein the content of magnesium oxide in the fused magnesia is not less than 97.5 wt%, and the volume density is more than 3.45g/cm3. The phenolic resin bonding agent is adopted, and the electric melting magnesite and the flaky graphite with different grain diameters are prepared into the composite material under the action of the additive, wherein the composite material has the advantages of good heat conducting property, low thermal expansion coefficient, high tensile strength, good toughness, oxidation resistance and scouring resistance.
Description
Technical Field
The invention relates to the technical field of processing of magnesia carbon bricks, in particular to a magnesia carbon brick used near an electric furnace door and a preparation method thereof.
Background
Along with the development of economy, the amount of steel scrap resources in China is gradually increased. The supply of scrap steel shows a strong growth situation, and the recycling of scrap steel resources is greatly concerned. In recent years, the state advocates the vigorous development of electric furnace steelmaking, and the current steelmaking electric furnace is developing towards large-scale, ultrahigh power, automatic control and the like. Along with the development of the electric furnace steelmaking technology, higher requirements are inevitably put forward on the used refractory materials, magnesia carbon bricks used near the electric furnace door not only bear the radiation of high-temperature arc light, but also bear the infiltration erosion and the scouring abrasion of high-temperature molten steel and slag, and simultaneously bear the rapid cooling and heating effects, the use conditions are very harsh, and the part is not easy to spray and repair, so the magnesia carbon bricks often become a weak link of the whole furnace service, the lining is frequently replaced off-line in the use of the electric furnace, the production rhythm is influenced, the hidden danger is buried for safety, the cost of steel per ton is increased, and the magnesia carbon bricks become a restriction link for the development of variety steel.
The magnesia carbon brick produced by the traditional process has relatively poor performance, and the following problems can be caused when the magnesia carbon brick is used near the door of an electric furnace:
1) the high-temperature electric arc has the melting loss effect on magnesia carbon bricks near the furnace door;
2) forming a decarburized layer by magnesia carbon bricks near a furnace door oxidized by furnace slag and air, and forming a deteriorated layer by molten iron infiltration and slag erosion;
3) the magnesia carbon brick deterioration layer and the original brick layer near the furnace door are stressed unevenly to be peeled off by the scouring abrasion of molten iron and slag, the mechanical action force of slag removal, thermal stress generated by rapid cooling and rapid heating and the like.
Disclosure of Invention
In order to overcome the problems, the invention aims to provide a magnesia carbon brick for the vicinity of an electric furnace door, which adopts a novel additive consisting of metal aluminum powder, titanium carbonitride powder and carbon fiber, and can form a compact protective layer on the surface of the magnesia carbon brick in the production process of the magnesia carbon brick, thereby improving the oxidation resistance and the scouring resistance of the magnesia carbon brick, ensuring that the magnesia carbon brick has more excellent compactness, improving the thermal shock resistance of the brick and improving the peeling problem of the brick.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a magnesia carbon brick for the vicinity of an electric furnace door is prepared from the following raw materials in parts by weight:
20-30 parts of fused magnesia with the granularity of more than or equal to 3mm and less than 5mm,
20-40 parts of fused magnesia with the granularity of more than or equal to 1mm and less than 3mm,
10-20 parts of fused magnesia with the granularity of more than or equal to 0.1mm and less than 1mm,
5-20 parts of fused magnesia fine powder with the granularity less than 0.088mm,
12-16 parts of flake graphite,
1-3 parts of phenolic resin binder,
1-6 parts of an additive agent,
the content of magnesium oxide in the fused magnesia is more than or equal to 97.5 wt%, and the volume density is more than 3.45g/cm3；
The additive is a mixture of titanium carbonitride, metal aluminum powder and carbon fiber.
Specifically, in some embodiments, the content of CaO in the fused magnesite according to the present invention is less than or equal to 1.6 wt%, the content of silica is less than or equal to 1.4 wt%, and the content of ferric oxide is less than or equal to 0.8 wt%.
Specifically, in some embodiments, the flake graphite of the present invention has a particle size of less than 0.088mm, wherein the carbon content is, by mass: c is more than or equal to 93.0 percent.
Specifically, in some embodiments, the physical and chemical indicators of the phenolic resin binder of the present invention are: the solid content is more than or equal to 80 percent, the residual carbon is more than or equal to 46 percent, the free phenol is less than or equal to 10 percent, the water content is less than or equal to 3.0 percent, and the pH value is 6-7.
Specifically, in some embodiments, the particle size of the metal aluminum powder, the titanium carbonitride and the carbon fiber of the present invention is 200-500 mesh, and the carbon content of the carbon fiber is greater than 90% and the fiber length is 10-20 mm.
Preferably, the additive is composed of titanium carbonitride, metal aluminum powder and carbon fiber in a mass ratio of 2:3-5: 7.
The invention also aims to provide a preparation method of the magnesia carbon brick for the vicinity of the furnace door of the electric furnace, which comprises the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing the magnesite, the binding agent and the flaky graphite with various granularities according to the proportion for later use;
2) mixing: mixing preheated fused magnesia with the granularity of not more than 3mm and less than 5mm, the granularity of not more than 1mm and less than 3mm and the granularity of not more than 0.1mm and less than 1mm with an additive at the temperature of 40-50 ℃, stirring for 3-5min to ensure that the additive is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder with the granularity of less than 0.088mm and flake graphite, mixing and stirring for 1-2min, finally adding a bonding agent, mixing for 8-12min at the stirring speed of 60r/min, mixing for 10-15min at the stirring speed of 40r/min, and then discharging at the discharging temperature of 40-50 ℃;
3) molding: extruding and molding the mixed raw materials under a 1000t press to obtain green bricks;
4) and (3) heat treatment: heating the extruded green brick at the temperature of 150-200 ℃ and preserving heat for 10-30h to obtain the magnesia carbon brick used near the door of the electric furnace.
Specifically, in some embodiments, the extruded green brick is heated to 110 ℃ for 8 hours, then slowly heated to 200 ℃ from 110 ℃ for 8 hours, kept at 200 ℃ for 6 hours, taken out of a kiln and sorted to obtain the magnesia carbon brick used near the door of the electric furnace.
The physical and chemical indexes of the magnesia carbon brick used near the furnace door of the electric furnace prepared by the invention are as follows:
76 to 78 weight percent of MgO, 12 to 14 weight percent of C and 3.10g/cm of bulk density3-3.15g/cm3The apparent porosity is less than or equal to 3 percent, the compressive strength is 40MPa to 60MPa, and the linear change rate is 0 to 1.0 percent.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts the additive composed of metal aluminum powder, titanium carbonitride powder and carbon fiber, and utilizes the additive to prepare the electric melting magnesia and flake graphite with various different grain diameters under the action of phenolic resin binding agent, thus having good heat-conducting property, low thermal expansion coefficient, high tensile strength, good toughness and oxidation resistance and scouring resistance.
The principle of the action of the binding agents of the invention is as follows: metallic Al reacts with C in graphite at low temperatures to form Al4C3Al with increasing temperature4C3Oxidized to Al2O3，Al2O3And reacts with MgO in the brick to finally generate MA. The reaction process is accompanied with volume expansion, so that the structure is compact, and a compact MA protective layer is formed on the surface of the brick, thereby inhibiting the oxidation of the brick and increasing the scouring resistance of the brick. Oxidation of TiCN to TiO at high temp2And CO, TiO formed2Due to E/E of its cation with oxygen ion2The value is moderate, so that MgO sintering can be effectively promoted, the structure of a sample is densified, the erosion resistance of the brick is improved, and the high-temperature rupture strength of the brick is improved. Negative pressure is generated inside the brick in the outward diffusion process of CO, so that oxygen atoms are prevented from further oxidizing the brick, and the oxidation resistance of the brick is enhanced. The carbon fibers are introduced into the brick, and have the excellent characteristics of high tensile strength, good toughness and the like, so that the carbon fibers have the reinforcing and toughening effects of pulling out, crack deflection, bridging, fracture and the like in the material fracture process, and the strength of the brick can be obviously improved; meanwhile, the carbon fiber also has the excellent characteristics of good heat conductivity, low thermal expansion coefficient and the like, the elastic modulus of the brick is reduced, the high-temperature linear expansion rate of the brick is reduced, the thermal shock property of the brick is improved, and the problem of stripping of the brick is solved.
Detailed Description
The present invention will be further described with reference to the following specific examples, which are shown in table 1 by using the physico-chemical indexes of fused magnesite.
TABLE 1
The physical and chemical indexes of the adopted phenolic resin are that the solid content is 89.2 wt%, the residual carbon is 50 wt%, the free phenol is 7.3 wt%, the water content is 2.7 wt%, and the pH value is 6. The carbon content of the carbon fibers was 95 wt% and the fiber length was 15mm.
Example 1
A magnesia carbon brick for the vicinity of an electric furnace door is prepared from the following raw materials in parts by weight:
20 portions of fused magnesia with the granularity of less than or equal to 3mm and less than 5mm,
25 portions of fused magnesia with the granularity of less than or equal to 1mm and less than 3mm,
20 portions of fused magnesia with the granularity of less than or equal to 0.1mm and less than 1mm,
16 parts of fused magnesia fine powder with the granularity of less than 0.088mm,
12 portions of flaky graphite with the granularity of 0.05mm,
3 parts of phenolic resin binding agent, namely 3 parts of phenolic resin,
the additive is 3 parts, and the additive is composed of titanium carbonitride, metal aluminum powder and carbon fiber in a mass ratio of 1:2:1, wherein the particle sizes of the titanium carbonitride, the metal aluminum powder and the carbon fiber are 325 meshes.
The magnesia carbon brick for the electric furnace door is prepared by the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing the magnesite, the binding agent and the flaky graphite with various granularities according to the proportion for later use;
2) mixing: mixing preheated fused magnesia with the granularity of not more than 3mm and less than 5mm, the granularity of not more than 1mm and less than 3mm and the granularity of not more than 0.1mm and less than 1mm with an additive at the temperature of 50 ℃, stirring for 5min to ensure that the additive is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder with the granularity of less than 0.088mm and flaky graphite, mixing and stirring for min, finally adding a bonding agent, stirring for 10min at the speed of 60r/min, mixing for 10min at the speed of 40r/min, and then discharging, wherein the discharging temperature is 45 ℃;
3) molding: extruding and molding the mixed raw materials under a 1000t press to obtain green bricks;
4) and (3) heat treatment: heating the extruded green brick to 110 ℃ for 8h, then slowly heating from 110 ℃ to 200 ℃ for 8h, preserving heat at 200 ℃ for 6h, taking out of the kiln and sorting to obtain the magnesia carbon brick used near the furnace door of the electric furnace.
The performance of the magnesia carbon brick prepared in this example was tested, and the test results were as follows:
77 wt% of MgO, 12.6% of C and a bulk density of 3.12g/cm3The apparent porosity was 1.5%, the compressive strength was 42MPa, and the linear change rate was 0.8%.
Example 2
A magnesia carbon brick for the vicinity of an electric furnace door is prepared from the following raw materials in parts by weight:
22 portions of fused magnesia with the granularity of less than or equal to 3mm and less than 5mm,
30 portions of fused magnesia with the granularity of less than or equal to 1mm and less than 3mm,
18 portions of fused magnesia with the granularity of less than 1mm and less than or equal to 0.1mm,
16 parts of fused magnesia fine powder with the granularity of less than 0.088mm,
14 parts of flaky graphite with the granularity of 0.05mm,
and 5 parts of an additive, wherein the additive is composed of titanium carbonitride, metal aluminum powder and carbon fibers in a mass ratio of 2:2:1, and the particle diameters of the titanium carbonitride, the metal aluminum powder and the carbon fibers are 325 meshes.
2.5 parts of phenolic resin binding agent,
the magnesia carbon brick for the electric furnace door is prepared by the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing the magnesite, the binding agent and the flaky graphite with various granularities according to the proportion for later use;
2) mixing: mixing preheated fused magnesia with the granularity of not more than 3mm and less than 5mm, the granularity of not more than 1mm and less than 3mm and the granularity of not more than 0.1mm and less than 1mm with an additive at the temperature of 50 ℃, stirring for 5min to ensure that the additive is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder with the granularity of less than 0.088mm and flaky graphite, mixing and stirring for min, finally adding a bonding agent, mixing for 10min at the stirring speed of 60r/min, mixing for 10min at the stirring speed of 40r/min, and then discharging, wherein the discharging temperature is 45 ℃;
3) molding: extruding and molding the mixed raw materials under a 1000t press to obtain green bricks;
4) and (3) heat treatment: heating the extruded green brick to 110 ℃ for 8h, then slowly heating from 110 ℃ to 200 ℃ for 8h, preserving heat at 200 ℃ for 6h, taking out of the kiln and sorting to obtain the magnesia carbon brick used near the furnace door of the electric furnace.
The magnesia carbon brick prepared in the embodiment is subjected to performance detection, and the result is as follows:
76 wt% of MgO, 14% of C and a bulk density of 3.11g/cm3The apparent porosity was 1.8%, the compressive strength was 45MPa, and the linear change rate was 0.9%.
Example 3
A magnesia carbon brick for the vicinity of an electric furnace door is prepared from the following raw materials in parts by weight:
23 portions of fused magnesia with the granularity of less than or equal to 3mm and less than 5mm,
29 portions of fused magnesia with the granularity of less than or equal to 1mm and less than 3mm,
19 parts of fused magnesia with the granularity of less than or equal to 0.1mm and less than 1mm,
14 parts of fused magnesia fine powder with the granularity of less than 0.088mm,
14 parts of flaky graphite with the granularity of 0.05mm,
6 parts of additive agent, wherein the additive agent is composed of titanium carbonitride, metal aluminum powder and carbon fiber in a mass ratio of 2:2:2, and the particle diameters of the titanium carbonitride, the metal aluminum powder and the carbon fiber are 325 meshes.
2.5 parts of phenolic resin binding agent,
the magnesia carbon brick for the electric furnace door is prepared by the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing the magnesite, the binding agent and the flaky graphite with various granularities according to the proportion for later use;
2) mixing: mixing preheated fused magnesia with the granularity of not more than 3mm and less than 5mm, the granularity of not more than 1mm and less than 3mm and the granularity of not more than 0.1mm and less than 1mm with an additive at the temperature of 50 ℃, stirring for 5min to ensure that the additive is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder with the granularity of less than 0.088mm and flaky graphite, mixing and stirring for min, finally adding a bonding agent, mixing for 10min at the stirring speed of 60r/min, mixing for 10min at the stirring speed of 40r/min, and then discharging, wherein the discharging temperature is 45 ℃;
3) molding: extruding and molding the mixed raw materials under a 1000t press to obtain green bricks;
4) and (3) heat treatment: heating the extruded green brick to 110 ℃ for 8h, then slowly heating from 110 ℃ to 200 ℃ for 8h, preserving heat at 200 ℃ for 6h, taking out of the kiln and sorting to obtain the magnesia carbon brick used near the furnace door of the electric furnace.
The magnesia carbon brick prepared in the embodiment is subjected to performance detection, and the result is as follows:
77 wt% of MgO, 14% of C and a bulk density of 3.10g/cm3The apparent porosity was 2.0%, the compressive strength was 48MPa, and the linear change rate was 0.9%.
Comparative example 1
A magnesia carbon brick for the vicinity of an electric furnace door is prepared from the following raw materials in parts by weight:
22 portions of fused magnesia with the granularity of less than or equal to 3mm and less than 5mm,
30 portions of fused magnesia with the granularity of less than or equal to 1mm and less than 3mm,
18 portions of fused magnesia with the granularity of less than 1mm and less than or equal to 0.1mm,
16 parts of fused magnesia fine powder with the granularity of less than 0.088mm,
14 parts of flaky graphite with the granularity of 0.05mm,
5 parts of additive, wherein the bonding agent is composed of titanium carbonitride, and the particle size of the titanium carbonitride is 325 meshes.
2.5 parts of phenolic resin binding agent,
the magnesia carbon brick for the electric furnace door is prepared by the following steps:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing the magnesite, the binding agent and the flaky graphite with various granularities according to the proportion for later use;
2) mixing: mixing preheated fused magnesia with the granularity of not more than 3mm and less than 5mm, the granularity of not more than 1mm and less than 3mm and the granularity of not more than 0.1mm and less than 1mm with an additive at the temperature of 50 ℃, stirring for 5min to ensure that the additive is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder with the granularity of less than 0.088mm and flaky graphite, mixing and stirring for min, finally adding a bonding agent, mixing for 10min at the stirring speed of 60r/min, mixing for 10min at the stirring speed of 40r/min, and then discharging, wherein the discharging temperature is 45 ℃;
3) molding: extruding and molding the mixed raw materials under a 1000t press to obtain green bricks;
4) and (3) heat treatment: heating the extruded green brick to 110 ℃ for 8h, then slowly heating from 110 ℃ to 200 ℃ for 8h, preserving heat at 200 ℃ for 6h, taking out of the kiln and sorting to obtain the magnesia carbon brick used near the furnace door of the electric furnace.
76 wt% of MgO, 14% of C and a bulk density of 3.10g/cm3The apparent porosity was 3.0%, the compressive strength was 35MPa, and the linear change rate was 0.9%.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (9)
1. A magnesia carbon brick for the vicinity of an electric furnace door is characterized by comprising the following raw materials in parts by weight:
20-30 parts of fused magnesia with the granularity of more than or equal to 3mm and less than 5mm,
20-40 parts of fused magnesia with the granularity of more than or equal to 1mm and less than 3mm,
10-20 parts of fused magnesia with the granularity of more than or equal to 0.1mm and less than 1mm,
5-20 parts of fused magnesia fine powder with the granularity less than 0.088mm,
12-16 parts of flake graphite,
1-3 parts of phenolic resin binder,
1-6 parts of an additive agent,
the content of magnesium oxide in the fused magnesia is more than or equal to 97.5 wt%, and the volume density of the particles is more than 3.45g/cm3；
The additive is a mixture of titanium carbonitride, metal aluminum powder and carbon fiber.
2. The magnesia carbon brick for the vicinity of the electric furnace door according to claim 1, wherein the content of CaO in the fused magnesia is 1.6 wt% or less, the content of silica is 1.4 wt% or less, and the content of ferric oxide is 0.8 wt% or less.
3. The magnesia carbon brick for the vicinity of the door of the electric furnace according to claim 1, wherein the flake graphite has a particle size of less than 0.088mm, and contains the following carbon in percentage by mass: c is more than or equal to 93.0 percent.
4. The magnesia carbon brick for the vicinity of the electric furnace door according to claim 1, wherein the physical and chemical indexes of the phenolic resin binder are as follows: the solid content is more than or equal to 80 percent, the residual carbon is more than or equal to 46 percent, the free phenol is less than or equal to 10 percent, the water content is less than or equal to 3.0 percent, and the pH value is 6-7.
5. The magnesia carbon brick for the vicinity of the door of an electric furnace according to claim 1, wherein the particles of the metal aluminum powder, the titanium carbonitride and the carbon fiber are all 200-500 mesh, the carbon content of the carbon fiber is more than 90% and the fiber length is 10-20 mm.
6. The magnesia carbon brick for the vicinity of the electric furnace door according to claim 5, wherein the additive is composed of titanium carbonitride, metal aluminum powder and carbon fiber in a mass ratio of 2:3 to 5: 7.
7. The method for preparing magnesia carbon bricks for use in the vicinity of an electric furnace door according to any one of claims 1 to 6, comprising the steps of:
1) preparing materials: dry-mixing the additive in a vibration mill uniformly to prepare co-ground powder for later use, and weighing the magnesite, the binding agent and the flaky graphite with various granularities according to the proportion for later use;
2) mixing: mixing preheated fused magnesia with the granularity of not more than 3mm and less than 5mm, the granularity of not more than 1mm and less than 3mm and the granularity of not more than 0.1mm and less than 1mm with an additive at the temperature of 40-50 ℃, stirring for 3-5min to ensure that the additive is uniformly coated on the surfaces of the fused magnesia particles, then adding fused magnesia fine powder with the granularity of less than 0.088mm and flake graphite, mixing and stirring for 1-2min, finally adding a bonding agent, mixing for 8-12min at the stirring speed of 60r/min, mixing for 10-15min at the stirring speed of 40r/min, and then discharging at the discharging temperature of 40-50 ℃;
3) molding: extruding and molding the mixed raw materials under a 1000t press to obtain green bricks;
4) and (3) heat treatment: heating the extruded green brick at the temperature of 150-200 ℃ and preserving heat for 10-30h to obtain the magnesia carbon brick used near the door of the electric furnace.
8. The method for preparing magnesia carbon bricks used near the door of the electric furnace according to claim 7, wherein the extruded green bricks are heated to 110 ℃ for 8 hours, then slowly heated from 110 ℃ to 200 ℃ for 8 hours, kept at 200 ℃ for 6 hours, taken out of the kiln and sorted to prepare the magnesia carbon bricks used near the door of the electric furnace.
9. The method for preparing magnesia carbon bricks for use in the vicinity of a door of an electric furnace according to claim 8, wherein the physical and chemical indexes of the prepared electric furnace bricks are as follows: 76 to 78 weight percent of MgO, 12 to 14 weight percent of C and 3.10g/cm of bulk density3-3.15g/cm3The apparent porosity is less than or equal to 3 percent, the compressive strength is 40MPa to 60MPa, and the linear change rate is 0 to 1.0 percent.
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| CN113683400A (en) * | 2021-09-10 | 2021-11-23 | 河南竹林庆州耐火材料有限公司 | Preparation method capable of improving high-temperature rupture strength of magnesia carbon brick |
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