CN112194489A - Production method of carbon block for large-section submerged arc furnace - Google Patents
Production method of carbon block for large-section submerged arc furnace Download PDFInfo
- Publication number
- CN112194489A CN112194489A CN202011094291.7A CN202011094291A CN112194489A CN 112194489 A CN112194489 A CN 112194489A CN 202011094291 A CN202011094291 A CN 202011094291A CN 112194489 A CN112194489 A CN 112194489A
- Authority
- CN
- China
- Prior art keywords
- anthracite
- parts
- carbon
- steps
- paste
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
- C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
- C04B35/528—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components
- C04B35/532—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite obtained from carbonaceous particles with or without other non-organic components containing a carbonisable binder
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
- C04B35/62605—Treating the starting powders individually or as mixtures
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6562—Heating rate
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
- C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
- C04B2235/6567—Treatment time
Abstract
A production method of carbon blocks for a large-section submerged arc furnace comprises the following raw materials in parts by weight: 10-14 parts of first anthracite coal, 18-22 parts of second anthracite coal, 22-26 parts of third anthracite coal, 8-14 parts of carbon powder, 30-34 parts of metallurgical coke and 12.5-16.5 parts of adhesive; mixing first anthracite, second anthracite, third anthracite, carbon powder and metallurgical coke to form a primary mixture; adding asphalt into the primary mixture to form a secondary mixture, adding an additive into the secondary mixture, wherein the additive is 2,4-2 nitrotoluene, and fully mixing to form a paste, and the mass percentage of the additive to the asphalt is 1-4%; forming a green body by adopting vibration molding of the paste; the green body is fired into a carbon block, the plasticity of the paste is adjusted by adding 2,4-2 nitrotoluene as an additive, the plasticity of the paste is ensured to be soft without caking and scattering without drying, and the uniformity of the internal and external physical and chemical indexes of the carbon block is ensured.
Description
Technical Field
The invention relates to the technical field of carbon block production, in particular to a method for producing a carbon block for a large-section submerged arc furnace.
Background
The carbon material is the main material used for the furnace lining of the submerged arc furnace, and the quality of the furnace bottom carbon block directly determines the service life of the furnace lining of the submerged arc furnace. The carbon blocks with large cross sections of 800mm multiplied by 4000mm are widely applied in developed countries, and the carbon blocks with small cross sections of 400mm multiplied by 1500mm are mostly produced in China for a long time due to the limitation of equipment and process technology, so that the requirement of large cross section carbon blocks for large submerged arc furnaces cannot be met. With the rapid development of high energy consumption industry, the furnace type of the submerged arc furnace is continuously developed to be large-scale, the requirements on the service life of a furnace lining and the safety of the furnace bottom are higher and higher, and the production of carbon blocks with large cross sections has urgent and practical significance. The large-section carbon block has large size and large material consumption, and is easy to generate the phenomenon of internal and external non-uniformity, and the qualified large-section carbon block firstly solves the problem of uniform internal and external physical and chemical indexes of the carbon block.
Disclosure of Invention
In view of the above, it is necessary to provide a method for producing carbon blocks with uniform physical and chemical indexes for large-section submerged arc furnaces.
A method for producing carbon blocks for a large-section submerged arc furnace comprises the steps of material preparation, material mixing, molding and roasting;
the material preparation step specifically comprises the following steps:
step 101: preparing aggregates, wherein the aggregates comprise a first anthracite, a second anthracite and a third anthracite, the granularity of the first anthracite is 8-12 mm, the granularity of the second anthracite is 4-8 mm, the granularity of the third anthracite is 0.5-4 mm, and the first anthracite, the second anthracite and the third anthracite are all calcined at low temperature to obtain calcined anthracite;
step 102: preparing powder, wherein the powder comprises carbon powder and metallurgical coke, and the granularity of the carbon powder is less than 200 meshes;
step 103: preparing a binding agent, wherein the binding agent comprises asphalt and an additive, the asphalt is high-softening-point coal asphalt, and the additive is 2,4-2 nitrotoluene;
the material mixing step specifically comprises the following steps:
step 201: the raw materials and the weight portions thereof are as follows: 10-14 parts of first anthracite coal, 18-22 parts of second anthracite coal, 22-26 parts of third anthracite coal, 8-14 parts of carbon powder, 30-34 parts of metallurgical coke and 12.5-16.5 parts of adhesive;
step 202: fully mixing the first anthracite, the second anthracite, the third anthracite, the carbon powder and the metallurgical coke prepared in the step 201 at a temperature of more than 120 ℃ to form a primary mixture;
step 203: adding the asphalt prepared in the step 201 into the primary mixture to form a secondary mixture, adding the additive prepared in the step 201 into the secondary mixture after 25 minutes, and fully mixing for more than 5 minutes to form a paste, wherein the mass percentage of the additive to the asphalt is 1-4%;
the molding steps are as follows: forming a green body by adopting vibration molding of the paste;
the roasting step is as follows: and firing the green body into a carbon block according to a certain temperature curve.
Compared with the prior art, the invention has the beneficial effects that:
the invention adjusts the plasticity of the paste by adding 2,4-2 nitrotoluene as an additive, ensures that the paste is soft in plasticity but not combined and scattered but not dried, and ensures the uniformity of the internal and external physical and chemical indexes of the carbon block.
Drawings
FIG. 1 is a cross-sectional sampling position view of a carbon block.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will further describe the embodiments.
The embodiment of the invention provides a method for producing carbon blocks for a large-section submerged arc furnace, which comprises the steps of material preparation, material mixing, molding and roasting;
the material preparation step specifically comprises the following steps:
step 101: preparing aggregates, wherein the aggregates comprise a first anthracite, a second anthracite and a third anthracite, the granularity of the first anthracite is 8-12 mm, the granularity of the second anthracite is 4-8 mm, the granularity of the third anthracite is 0.5-4 mm, and the first anthracite, the second anthracite and the third anthracite are all calcined at low temperature to obtain calcined anthracite;
step 102: preparing powder, wherein the powder comprises carbon powder and metallurgical coke, and the granularity of the carbon powder is less than 200 meshes;
step 103: preparing a binding agent, wherein the binding agent comprises asphalt and an additive, the asphalt is high-softening-point coal asphalt, and the additive is 2,4-2 nitrotoluene;
the material mixing step specifically comprises the following steps:
step 201: the raw materials and the weight portions thereof are as follows: 10-14 parts of first anthracite coal, 18-22 parts of second anthracite coal, 22-26 parts of third anthracite coal, 8-14 parts of carbon powder, 30-34 parts of metallurgical coke and 12.5-16.5 parts of adhesive;
step 202: fully mixing the first anthracite, the second anthracite, the third anthracite, the carbon powder and the metallurgical coke prepared in the step 201 at a temperature of more than 120 ℃ to form a primary mixture;
step 203: adding the asphalt prepared in the step 201 into the primary mixture to form a secondary mixture, adding the additive prepared in the step 201 into the secondary mixture after 25 minutes, and fully mixing for more than 5 minutes to form a paste, wherein the mass percentage of the additive to the asphalt is 1-4%;
the molding steps are as follows: forming a green body by adopting vibration molding of the paste;
the roasting step is as follows: and firing the green body into a carbon block according to a certain temperature curve.
The paste dosage of a green body with 800mm multiplied by 4000mm is 4.6 tons, and if the paste dosage of large tonnage is required to keep a good internal structure of the green body, the paste is required to be ensured to be plastic and soft without agglomeration, scattering and dryness, and the processing mode of common asphalt cannot meet the requirement.
Asphalt for the carbon blocks with large cross sections of 800mm to 4000mm needs high asphalt softening point to ensure that the roasted carbon blocks have enough strength, but paste with high asphalt softening point is easy to harden, and more dry materials are mixed in the formed green bodies.
Compared with the prior art, the invention has the beneficial effects that:
the invention adjusts the plasticity of the paste by adding 2,4-2 nitrotoluene as an additive, ensures that the paste is soft in plasticity but not combined and scattered but not dried, and ensures the uniformity of the internal and external physical and chemical indexes of the carbon block.
Further, the temperature profile in the calcination step was: heating the molded green body to 300 ℃ at a heating rate of not more than 5 ℃/h, heating to 600 ℃ at a heating rate of not more than 1 ℃/h, heating to 1320 ℃ at a heating rate of not more than 3 ℃/h, and preserving heat for at least 48h to form the carbon block.
Further, a mould pressing vibration forming machine is adopted in the forming step, and a mould of the mould pressing vibration forming machine is provided with evacuation equipment.
And a vacuumizing mode is adopted, a large amount of smoke in the paste is removed, and internal cracks are solved.
Further, the specific gravity of the green compact was 1.62.
Further, an exhaust step is also included between the mixing step and the molding step, and the exhaust step specifically comprises the following steps: the paste is kept warm at a temperature of more than 130 ℃ and fully stirred to remove smoke in the paste.
And removing a large amount of smoke in the paste through an exhaust step to solve internal cracks.
Further, in the air exhaust step, the paste was kept at 130 ℃.
Further, a processing step is included after the roasting step, and in the processing step, the processing error is within-1-0 mm.
Further, in step 203, an additive is added to the secondary mixture after 25 minutes, and the mixture is fully mixed for 5 to 10 minutes to form a paste.
Further, the granularity of the carbon powder is 200 meshes, the first anthracite, the second anthracite and the third anthracite are all high-quality Taixi anthracite, the purities of the first anthracite, the second anthracite and the third anthracite are all more than or equal to 85%, and the purities of the carbon powder and the metallurgical coke are all 70 +/-3%.
Further, in step 201, the following raw materials and their weight portions are mixed: 12 parts of first anthracite coal, 20 parts of second anthracite coal, 24 parts of third anthracite coal, 10 parts of carbon powder, 32 parts of metallurgical coke and 14.5 parts of adhesive.
The invention is further illustrated by the following examples and comparative examples, which are intended to illustrate the invention in detail and are not to be construed as limiting the scope of the invention in any way.
The sampling specifications of the carbon blocks prepared in the following examples 1 to 3 and comparative example 1 are shown in fig. 1, and the physicochemical indexes of the carbon blocks prepared in the examples 1 to 3 and comparative example 1 are shown in tables 1 to 4.
Example 1: preparing aggregates, wherein the aggregates comprise a first anthracite, a second anthracite and a third anthracite, the granularity of the first anthracite is 8-12 mm, the granularity of the second anthracite is 4-8 mm, the granularity of the third anthracite is 0.5-4 mm, and the first anthracite, the second anthracite and the third anthracite are all calcined at low temperature to obtain calcined anthracite; preparing powder, wherein the powder comprises carbon powder and metallurgical coke, and the granularity of the carbon powder is 200 meshes; preparing a bonding agent, wherein the bonding agent comprises asphalt and an additive, the asphalt is high-softening-point coal asphalt, and the additive is 2,4-2 nitrotoluene; the raw materials and the weight portions thereof are as follows: 12 parts of first anthracite, 20 parts of second anthracite, 24 parts of third anthracite, 10 parts of carbon powder, 32 parts of metallurgical coke and 14.5 parts of adhesive; fully mixing the prepared first anthracite, second anthracite, third anthracite, carbon powder and metallurgical coke at a temperature of more than 120 ℃ to form a primary mixture; adding asphalt into the primary mixture to form a secondary mixture, adding an additive into the secondary mixture after 25 minutes, and fully mixing for 5-10 minutes to form a paste, wherein the mass percentage of the additive to the asphalt is 1%; the paste is kept at 130 ℃ and fully stirred to remove smoke in the paste, the paste is formed into a green body by vibration forming, the specific gravity of the green body is 1.62, the green body is fired into a carbon block according to a certain temperature curve, the temperature curve is that the formed green body is heated to 300 ℃ according to the heating rate not more than 5 ℃/h, then heated to 600 ℃ according to the heating rate not more than 1 ℃/h, then heated to 1320 ℃ according to the heating rate not more than 3 ℃/h, and kept at least for 48 h. The physical and chemical indexes of the prepared carbon block are shown in table 1.
TABLE 1 physicochemical index of the sample location with 1% additive added
| Item | Bulk density | Ash content | Compressive strength | Apparent porosity |
| Unit of | g/cm³ | % | MPa | % |
| a | 1.53 | 6.20 | 36 | 14.1 |
| b | 1.54 | 6.15 | 34 | 14.4 |
| c | 1.53 | 6.08 | 35 | 14.8 |
| d | 1.54 | 5.96 | 36 | 14.1 |
| e | 1.54 | 6.05 | 37 | 14.5 |
Example 2: preparing aggregates, wherein the aggregates comprise a first anthracite, a second anthracite and a third anthracite, the granularity of the first anthracite is 8-12 mm, the granularity of the second anthracite is 4-8 mm, the granularity of the third anthracite is 0.5-4 mm, and the first anthracite, the second anthracite and the third anthracite are all calcined at low temperature to obtain calcined anthracite; preparing powder, wherein the powder comprises carbon powder and metallurgical coke, and the granularity of the carbon powder is 200 meshes; preparing a bonding agent, wherein the bonding agent comprises asphalt and an additive, the asphalt is high-softening-point coal asphalt, and the additive is 2,4-2 nitrotoluene; the raw materials and the weight portions thereof are as follows: 12 parts of first anthracite, 20 parts of second anthracite, 24 parts of third anthracite, 10 parts of carbon powder, 32 parts of metallurgical coke and 14.5 parts of adhesive; fully mixing the prepared first anthracite, second anthracite, third anthracite, carbon powder and metallurgical coke at a temperature of more than 120 ℃ to form a primary mixture; adding asphalt into the primary mixture to form a secondary mixture, adding an additive into the secondary mixture after 25 minutes, and fully mixing for 5-10 minutes to form a paste, wherein the mass percentage of the additive to the asphalt is 3%; the paste is kept at 130 ℃ and fully stirred to remove smoke in the paste, the paste is formed into a green body by vibration forming, the specific gravity of the green body is 1.62, the green body is fired into a carbon block according to a certain temperature curve, the temperature curve is that the formed green body is heated to 300 ℃ according to the heating rate not more than 5 ℃/h, then heated to 600 ℃ according to the heating rate not more than 1 ℃/h, then heated to 1320 ℃ according to the heating rate not more than 3 ℃/h, and kept at least for 48 h. The physical and chemical indexes of the prepared carbon block are shown in table 2.
TABLE 2 physicochemical indices of the sampling locations with 3% additive
| Item | Bulk density | Ash content | Compressive strength | Apparent porosity |
| Unit of | g/cm³ | % | MPa | % |
| a | 1.55 | 6.20 | 42 | 14.1 |
| b | 1.55 | 6.15 | 39 | 13.8 |
| c | 1.54 | 6.08 | 37 | 14.4 |
| d | 1.56 | 5.96 | 40 | 14.1 |
| e | 1.57 | 6.05 | 45 | 1.6 |
Example 3: preparing aggregates, wherein the aggregates comprise a first anthracite, a second anthracite and a third anthracite, the granularity of the first anthracite is 8-12 mm, the granularity of the second anthracite is 4-8 mm, the granularity of the third anthracite is 0.5-4 mm, and the first anthracite, the second anthracite and the third anthracite are all calcined at low temperature to obtain calcined anthracite; preparing powder, wherein the powder comprises carbon powder and metallurgical coke, and the granularity of the carbon powder is 200 meshes; preparing a bonding agent, wherein the bonding agent comprises asphalt and an additive, the asphalt is high-softening-point coal asphalt, and the additive is 2,4-2 nitrotoluene; the raw materials and the weight portions thereof are as follows: 12 parts of first anthracite, 20 parts of second anthracite, 24 parts of third anthracite, 10 parts of carbon powder, 32 parts of metallurgical coke and 14.5 parts of adhesive; fully mixing the prepared first anthracite, second anthracite, third anthracite, carbon powder and metallurgical coke at a temperature of more than 120 ℃ to form a primary mixture; adding asphalt into the primary mixture to form a secondary mixture, adding an additive into the secondary mixture after 25 minutes, and fully mixing for 5-10 minutes to form a paste, wherein the mass percentage of the additive to the asphalt is 4%; the paste is kept at 130 ℃ and fully stirred to remove smoke in the paste, the paste is formed into a green body by vibration forming, the specific gravity of the green body is 1.62, the green body is fired into a carbon block according to a certain temperature curve, the temperature curve is that the formed green body is heated to 300 ℃ according to the heating rate not more than 5 ℃/h, then heated to 600 ℃ according to the heating rate not more than 1 ℃/h, then heated to 1320 ℃ according to the heating rate not more than 3 ℃/h, and kept at least for 48 h. The physical and chemical indexes of the prepared carbon block are shown in table 3.
TABLE 3 physicochemical indices of sampling locations with 4% additive
| Item | Bulk density | Ash content | Compressive strength | Apparent porosity |
| Unit of | g/cm³ | % | MPa | % |
| a | 1.53 | 6.18 | 34 | 14.4 |
| b | 1.52 | 6.14 | 35 | 14.7 |
| c | 1.52 | 6.10 | 32 | 14.8 |
| d | 1.54 | 6.03 | 33 | 14.1 |
| e | 1.53 | 6.05 | 34 | 14.5 |
Comparative example 1: preparing aggregates, wherein the aggregates comprise a first anthracite, a second anthracite and a third anthracite, the granularity of the first anthracite is 8-12 mm, the granularity of the second anthracite is 4-8 mm, the granularity of the third anthracite is 0.5-4 mm, and the first anthracite, the second anthracite and the third anthracite are all calcined at low temperature to obtain calcined anthracite; preparing powder, wherein the powder comprises carbon powder and metallurgical coke, and the granularity of the carbon powder is 200 meshes; preparing a bonding agent, wherein the first anthracite, the second anthracite and the third anthracite are high-quality Taixi anthracite, the purities of the first anthracite, the second anthracite and the third anthracite are all more than or equal to 85%, the purities of carbon powder and metallurgical coke are all 70 +/-3%, the bonding agent comprises asphalt, and the asphalt is high-softening-point coal asphalt; the raw materials and the weight portions thereof are as follows: 12 parts of first anthracite, 20 parts of second anthracite, 24 parts of third anthracite, 10 parts of carbon powder, 32 parts of metallurgical coke and 14.5 parts of adhesive; fully mixing the prepared first anthracite, second anthracite, third anthracite, carbon powder and metallurgical coke at a temperature of more than 120 ℃ to form a primary mixture; adding asphalt into the primary mixture, fully mixing for 30-35 minutes to form a paste, preserving the heat of the paste at 130 ℃, fully stirring to remove smoke in the paste, forming a green body by adopting vibration forming on the paste, wherein the specific gravity of the green body is 1.62, firing the green body into a carbon block according to a certain temperature curve, wherein the temperature curve is that the formed green body is firstly heated to 300 ℃ according to the heating rate of not more than 5 ℃/h, then heated to 600 ℃ according to the heating rate of not more than 1 ℃/h, then heated to 1320 ℃ according to the heating rate of not more than 3 ℃/h, and preserving the heat for at least 48 h. The physical and chemical indexes of the prepared carbon block are shown in table 4.
TABLE 4 physicochemical indices of sampling locations without additives
| Item | Bulk density | Ash content | Compressive strength | Apparent porosity |
| Unit of | g/cm³ | % | MPa | % |
| a | 1.50 | 6.09 | 34 | 16.5 |
| b | 1.52 | 6.10 | 32 | 15.3 |
| c | 1.51 | 5.21 | 31 | 15.5 |
| d | 1.53 | 6.05 | 33 | 14.9 |
| e | 1.52 | 6.12 | 32 | 15.2 |
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A method for producing carbon blocks for a large-section submerged arc furnace is characterized by comprising the following steps: the method comprises the steps of material preparation, material mixing, molding and roasting;
the material preparation step specifically comprises the following steps:
step 101: preparing aggregates, wherein the aggregates comprise a first anthracite, a second anthracite and a third anthracite, the granularity of the first anthracite is 8-12 mm, the granularity of the second anthracite is 4-8 mm, the granularity of the third anthracite is 0.5-4 mm, and the first anthracite, the second anthracite and the third anthracite are all calcined at low temperature to obtain calcined anthracite;
step 102: preparing powder, wherein the powder comprises carbon powder and metallurgical coke, and the granularity of the carbon powder is less than 200 meshes;
step 103: preparing a binding agent, wherein the binding agent comprises asphalt and an additive, the asphalt is high-softening-point coal asphalt, and the additive is 2,4-2 nitrotoluene;
the material mixing step specifically comprises the following steps:
step 201: the raw materials and the weight portions thereof are as follows: 10-14 parts of first anthracite coal, 18-22 parts of second anthracite coal, 22-26 parts of third anthracite coal, 8-14 parts of carbon powder, 30-34 parts of metallurgical coke and 12.5-16.5 parts of adhesive;
step 202: fully mixing the first anthracite, the second anthracite, the third anthracite, the carbon powder and the metallurgical coke prepared in the step 201 at a temperature of more than 120 ℃ to form a primary mixture;
step 203: adding the asphalt prepared in the step 201 into the primary mixture to form a secondary mixture, adding the additive prepared in the step 201 into the secondary mixture after 25 minutes, and fully mixing for more than 5 minutes to form a paste, wherein the mass percentage of the additive to the asphalt is 1-4%;
the molding steps are as follows: forming a green body by adopting vibration molding of the paste;
the roasting step is as follows: and firing the green body into a carbon block according to a certain temperature curve.
2. The method for producing the carbon blocks for the large-section ore-smelting furnace according to claim 1, which is characterized by comprising the following steps: the temperature profile in the calcination step was: heating the molded green body to 300 ℃ at a heating rate of not more than 5 ℃/h, heating to 600 ℃ at a heating rate of not more than 1 ℃/h, heating to 1320 ℃ at a heating rate of not more than 3 ℃/h, and preserving heat for at least 48h to form the carbon block.
3. The method for producing the carbon blocks for the large-section ore-smelting furnace according to claim 1, which is characterized by comprising the following steps: and in the molding step, a mold pressing vibration molding machine is adopted, and a mold of the mold pressing vibration molding machine is provided with evacuation equipment.
4. The production method of the carbon block for the large-section ore-smelting furnace as claimed in claim 3, wherein: the green body had a specific gravity of 1.62.
5. The method for producing the carbon blocks for the large-section ore-smelting furnace according to claim 1, which is characterized by comprising the following steps: the method also comprises an air exhaust step between the material mixing step and the molding step, wherein the air exhaust step specifically comprises the following steps: the paste is kept warm at a temperature of more than 130 ℃ and fully stirred to remove smoke in the paste.
6. The method for producing the carbon blocks for the large-section ore-smelting furnace according to claim 5, which is characterized by comprising the following steps: in the degassing step, the paste is incubated at 130 ℃.
7. The method for producing the carbon blocks for the large-section ore-smelting furnace according to claim 1, which is characterized by comprising the following steps: and a processing step is further included after the roasting step, wherein in the processing step, the processing error is within-1-0 mm.
8. The method for producing the carbon blocks for the large-section ore-smelting furnace according to claim 1, which is characterized by comprising the following steps: in step 203, the additive is added to the secondary mixture after 25 minutes, and the mixture is fully mixed for 5 to 10 minutes to form a paste.
9. The method for producing the carbon blocks for the large-section ore-smelting furnace according to claim 1, which is characterized by comprising the following steps: the particle size of the carbon powder is 200 meshes, the first anthracite, the second anthracite and the third anthracite are all high-quality Taixi anthracite, the purities of the first anthracite, the second anthracite and the third anthracite are all more than or equal to 85%, and the purities of the carbon powder and the metallurgical coke are all 70 +/-3%.
10. The method for producing the carbon blocks for the large-section ore-smelting furnace according to claim 1, which is characterized by comprising the following steps: in step 201, the following raw materials and their weight portions are mixed: 12 parts of first anthracite coal, 20 parts of second anthracite coal, 24 parts of third anthracite coal, 10 parts of carbon powder, 32 parts of metallurgical coke and 14.5 parts of adhesive.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011094291.7A CN112194489A (en) | 2020-10-14 | 2020-10-14 | Production method of carbon block for large-section submerged arc furnace |
| CN202210838308.8A CN115159989A (en) | 2020-10-14 | 2020-10-14 | Production method of carbon block for large-section submerged arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011094291.7A CN112194489A (en) | 2020-10-14 | 2020-10-14 | Production method of carbon block for large-section submerged arc furnace |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210838308.8A Division CN115159989A (en) | 2020-10-14 | 2020-10-14 | Production method of carbon block for large-section submerged arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112194489A true CN112194489A (en) | 2021-01-08 |
Family
ID=74009024
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210838308.8A Pending CN115159989A (en) | 2020-10-14 | 2020-10-14 | Production method of carbon block for large-section submerged arc furnace |
| CN202011094291.7A Pending CN112194489A (en) | 2020-10-14 | 2020-10-14 | Production method of carbon block for large-section submerged arc furnace |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210838308.8A Pending CN115159989A (en) | 2020-10-14 | 2020-10-14 | Production method of carbon block for large-section submerged arc furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN115159989A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928962A (en) * | 2010-08-03 | 2010-12-29 | 湖南晟通科技集团有限公司 | Method for plasticizing anode paste |
| CN103449401A (en) * | 2013-08-15 | 2013-12-18 | 河南科技大学 | Preparation method of high-graphite cold ramming paste |
| CN103553439A (en) * | 2013-10-11 | 2014-02-05 | 郑州经纬科技实业有限公司 | Cold ramming paste and cathode carbon block and steel bar combined structure with joint filled by cold ramming paste |
| CN105420758A (en) * | 2015-12-01 | 2016-03-23 | 宁夏宁平炭素有限责任公司 | Preparing method for whole-coal carbon block cathodes |
| CN109456079A (en) * | 2018-12-29 | 2019-03-12 | 宁夏宁平炭素有限责任公司 | The preparation method of mineral hot furnace thermal-insulating type micropore electric furnace carbon block |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2821365A1 (en) * | 2001-02-28 | 2002-08-30 | Carbone Savoie | GRAPHITE CATHODE FOR ALUMINUM ELECTROLYSIS |
| CN1986896B (en) * | 2005-12-23 | 2010-06-30 | 青铜峡市青鑫炭素有限责任公司 | High graphite content cathode carbon block for large aluminium product and its producing process |
| CN102992805B (en) * | 2012-11-27 | 2014-12-10 | 方大炭素新材料科技股份有限公司 | High-thermal conductivity ultramicropore carbon brick and preparation method thereof |
| CN105025602A (en) * | 2015-07-13 | 2015-11-04 | 河北联冠电极股份有限公司 | Carbon nanometer ultramicro material large carbon electrode and preparation method thereof |
-
2020
- 2020-10-14 CN CN202210838308.8A patent/CN115159989A/en active Pending
- 2020-10-14 CN CN202011094291.7A patent/CN112194489A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928962A (en) * | 2010-08-03 | 2010-12-29 | 湖南晟通科技集团有限公司 | Method for plasticizing anode paste |
| CN103449401A (en) * | 2013-08-15 | 2013-12-18 | 河南科技大学 | Preparation method of high-graphite cold ramming paste |
| CN103553439A (en) * | 2013-10-11 | 2014-02-05 | 郑州经纬科技实业有限公司 | Cold ramming paste and cathode carbon block and steel bar combined structure with joint filled by cold ramming paste |
| CN105420758A (en) * | 2015-12-01 | 2016-03-23 | 宁夏宁平炭素有限责任公司 | Preparing method for whole-coal carbon block cathodes |
| CN109456079A (en) * | 2018-12-29 | 2019-03-12 | 宁夏宁平炭素有限责任公司 | The preparation method of mineral hot furnace thermal-insulating type micropore electric furnace carbon block |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115159989A (en) | 2022-10-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105272287B (en) | A method of preparing graphite crucible with recycled graphite | |
| CN111574226B (en) | Preparation method of high-density low-free silicon content reaction sintered silicon carbide ceramic material | |
| CN108863414B (en) | High-performance magnesia carbon brick and preparation method thereof | |
| CN110698179A (en) | High-performance magnesia carbon brick and preparation method thereof | |
| CN107311686B (en) | Preparation process of graphite electrode | |
| CN114835493A (en) | Method for manufacturing graphite box plate for negative electrode material graphitization box furnace | |
| CN113173802A (en) | Method for preparing porous mullite brick by using secondary aluminum ash | |
| CN112266248A (en) | Method for preparing graphite crucible by using low-quality graphite raw material | |
| CN111925189A (en) | Composite magnesia carbon brick and preparation method thereof | |
| CN110803933A (en) | Method for manufacturing ceramsite by using casting waste sand | |
| CN114604866A (en) | Method for preparing high-performance isostatic pressing graphite in short process | |
| CN114085068A (en) | Aluminum ash light brick and preparation method thereof | |
| CN110937906B (en) | Safe and energy-saving smelting furnace body and smelting device adopting same | |
| CN111635239A (en) | Efficient production method of refractory brick | |
| CN112194489A (en) | Production method of carbon block for large-section submerged arc furnace | |
| CN108249934B (en) | Light castable | |
| CN110668820A (en) | Preparation method of high-performance carbon graphite product with superfine structure | |
| CN106830906B (en) | Densification method of low-gradient-difference chromium oxide product | |
| CN107663085B (en) | Clay heat-insulating refractory brick NG120-0.6 and preparation method thereof | |
| CN115433009A (en) | Sagger for graphitizing and purifying battery negative electrode and preparation method thereof | |
| CN101913891B (en) | Refractory bricks for flue walls of carbon anode baking furnaces and preparation method thereof | |
| CN103056284A (en) | Clay completely-regenerated sand modifier, modification method and application of modifier | |
| CN111943692B (en) | High-performance magnesia-calcium brick and preparation method thereof | |
| CN113999011A (en) | Short-process graphite preparation method | |
| CN109942279B (en) | Ordinary baked brick prepared from casting waste |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20210108 |
|
| RJ01 | Rejection of invention patent application after publication |