CN114380597A - Environment-friendly high-strength carbon brick for blast furnace and preparation method thereof - Google Patents
Environment-friendly high-strength carbon brick for blast furnace and preparation method thereof Download PDFInfo
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- CN114380597A CN114380597A CN202210051779.4A CN202210051779A CN114380597A CN 114380597 A CN114380597 A CN 114380597A CN 202210051779 A CN202210051779 A CN 202210051779A CN 114380597 A CN114380597 A CN 114380597A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 93
- 239000011449 brick Substances 0.000 title claims abstract description 88
- 238000002360 preparation method Methods 0.000 title abstract description 13
- 239000002245 particle Substances 0.000 claims abstract description 67
- 238000002156 mixing Methods 0.000 claims abstract description 46
- 239000000428 dust Substances 0.000 claims abstract description 45
- 239000000843 powder Substances 0.000 claims abstract description 41
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 40
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 32
- 239000002699 waste material Substances 0.000 claims abstract description 24
- 239000010439 graphite Substances 0.000 claims abstract description 21
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 21
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 21
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 19
- 239000010703 silicon Substances 0.000 claims abstract description 19
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000005011 phenolic resin Substances 0.000 claims abstract description 13
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 13
- 229920001187 thermosetting polymer Polymers 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims abstract description 11
- 238000003754 machining Methods 0.000 claims abstract description 9
- 239000011159 matrix material Substances 0.000 claims abstract description 9
- 238000012216 screening Methods 0.000 claims abstract description 7
- 239000012634 fragment Substances 0.000 claims description 23
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 14
- 239000000758 substrate Substances 0.000 claims description 8
- 238000000748 compression moulding Methods 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 3
- 239000007767 bonding agent Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 4
- 239000000377 silicon dioxide Substances 0.000 claims 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 30
- 238000005260 corrosion Methods 0.000 abstract description 15
- 230000007797 corrosion Effects 0.000 abstract description 15
- 229910052742 iron Inorganic materials 0.000 abstract description 15
- 239000011230 binding agent Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000011148 porous material Substances 0.000 description 6
- 239000003054 catalyst Substances 0.000 description 4
- 239000000919 ceramic Substances 0.000 description 4
- 238000011065 in-situ storage Methods 0.000 description 4
- 230000008092 positive effect Effects 0.000 description 4
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 3
- 239000003830 anthracite Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- UHZZMRAGKVHANO-UHFFFAOYSA-M chlormequat chloride Chemical compound [Cl-].C[N+](C)(C)CCCl UHZZMRAGKVHANO-UHFFFAOYSA-M 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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Abstract
The invention discloses an environment-friendly high-strength carbon brick for a blast furnace and a preparation method thereof, relating to the field of carbon bricks for the blast furnace, wherein the raw materials comprise the following components in parts by weight: 5-20 parts of mixed dust collecting powder, 4-8 parts of silicon carbide powder, 8-12 parts of silicon powder, 3-6 parts of ultrafine crystalline flake graphite and 1-2 parts of silicon micropowder are used as matrixes, 50-65 parts of roasted particles are used as aggregates, and 15-25 parts of thermosetting phenolic resin in the sum of the matrixes and the aggregates is used as a binding agent; the matrix and aggregate were placed in an Aili intensive mixer. The mixed dust collecting powder is obtained by mixing the dust collected by the dust remover in the material mixing process, the crushing process and the machining process in a three-screw mixer; the baking crushed waste carbon bricks after high-temperature baking or recycled waste carbon bricks are obtained after crushing and screening. Most of the raw materials used in the invention are waste reclaimed materials, the preparation process is simple, the cost is low, the environment is protected, and the prepared product has high strength, high thermal conductivity and excellent molten iron corrosion resistance.
Description
Technical Field
The invention relates to a carbon brick for a blast furnace, in particular to an environment-friendly high-strength carbon brick for the blast furnace and a preparation method thereof.
Background
The blast furnace is the core equipment of the iron-making system, and the carbon bricks are key lining materials of the hearth and the bottom of the blast furnace. In recent years, with the development of large-scale and long-life blast furnaces and the application of intensified smelting technologies such as high air pressure, high air temperature and oxygen-enriched coal injection, the working environment of the carbon bricks at the bottom of the hearth is extremely severe. In order to ensure and prolong the service life of the blast furnace, higher requirements are put forward on the performance of the carbon bricks at the bottom of the hearth. In addition, with the promotion of the national strategy of energy conservation, emission reduction and consumption reduction, the development of low-carbon economy and the latest mission target of carbon neutralization and carbon peak reaching, the future resource recycling and green sustainable development are more and more important. Therefore, the development of a new generation of environment-friendly, high-strength, high-microporosity and high-heat-conductivity carbon brick is of great significance.
At present, the carbon brick is generally prepared by using electrically calcined anthracite as a main raw material, asphalt as a binding agent, a Z-shaped mixing mill for mixing and grinding, vibration molding or compression molding, carbon-embedding roasting according to a certain roasting system, and then processing. In the roasting process of the carbon bricks, the carbon bricks are easy to crack due to large size, inaccurate temperature control or other reasons, the yield of the carbon bricks is only about 55 percent, and the other 45 percent of the carbon bricks are waste carbon bricks, but the efficient utilization of the waste carbon bricks is not reported in the industry. In addition, in the processing process of cutting, milling and grinding the carbon brick, a large amount of collected particles and dust are always difficult to utilize due to different particle sizes.
Disclosure of Invention
The invention aims to provide a preparation method of an environment-friendly high-strength carbon brick for a blast furnace, which is low in cost and easy for industrial production.
In order to achieve the purpose, the invention provides the following technical scheme:
an environment-friendly high-strength carbon brick for a blast furnace and a preparation method thereof are disclosed, wherein the raw materials comprise the following components in parts by weight: 5-20 parts of mixed dust collecting powder, 4-8 parts of silicon carbide powder, 8-12 parts of silicon powder, 3-6 parts of ultrafine flake graphite and 1-2 parts of silicon micropowder as a matrix.
Preferably: the mixed dust collecting powder is prepared by mixing the following dust collected by a dust remover in the material mixing process, the crushing process and the machining process according to the mass ratio of 1: 1: 3 is obtained after being placed in a triple-spiral mixer for mixing for 1 to 2 hours, the C content of the mixed dust-collecting powder is more than 80 parts, the diameter of the granularity is less than 0.075mm, and the quantity is more than 75 parts
Preferably: the granularity of the silicon carbide powder is less than 0.045mm, and the SiC content in the silicon carbide powder is more than 97 parts.
Preferably: the granularity of the silicon powder is less than 0.045mm, and the content of Si in the silicon powder is more than 95 parts.
Preferably: the granularity of the superfine crystalline flake graphite is less than 0.015mm, and the content of C in the superfine crystalline flake graphite is more than 95 parts.
Preferably: the granularity of the silicon micro powder is less than 0.045mm, and SiO in the silicon micro powder2The content is more than 95 parts.
Preferably: taking 50-65 parts of roasted fragments as aggregates and adding 15-25 parts of thermosetting phenolic resin as a binding agent; placing the substrate and the aggregate into an Aili strong countercurrent mixer, mixing for 1-3 minutes, then adding the thermosetting phenolic resin, and mixing for 10-15 minutes; and (3) performing cold-state compression molding, drying at 110-180 ℃, and sintering at 1200-1400 ℃ in a carbon-buried atmosphere to obtain the environment-friendly high-strength carbon brick for the blast furnace.
Preferably: the roasting fragments are obtained by crushing and screening waste carbon bricks after high-temperature roasting or recycled old carbon bricks, and the grading particle size length of the roasting fragments comprises the following parts by weight: 25-35 parts of particles with the particle size of 6-4 mm, 20-30 parts of particles with the particle size of 4-2 mm, 20-30 parts of particles with the particle size of 2-1 mm, 20-25 parts of particles with the particle size of 1-0.2 mm, and the content of C in roasted particles is more than 85 parts.
Due to the adoption of the technical scheme, the invention has the following advantages:
due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
the aggregate used in the invention is mainly roasted fragments which are obtained by crushing roasted waste carbon bricks, belongs to the reutilization of waste resources, changes waste into valuable, and effectively reduces the production cost of the carbon bricks. The waste carbon brick is roasted at high temperature, and the main components of the roasted fragments obtained by crushing are carbon and silicon carbide, so that compared with the traditional raw material of electrically calcined anthracite, the waste carbon brick has higher particle strength and no large holes; the roasted fragments are used as carbon brick aggregates, and the method has positive effects on improving the strength, the microporosity rate, the heat conductivity coefficient and the molten iron corrosion resistance of the prepared carbon bricks.
The substrate used in the invention is mainly mixed dust collecting powder, which is obtained by mixing dust collected in the material preparing process, the crushing process and the machining process of the dust remover. Because the dust collected by the dust remover has different particle sizes (about 0.5 mm-0.015 mm) and can not be directly utilized, the dust collected in different processes is premixed by the three-spiral mixer, the homogenization of the particle sizes of the mixed dust collection powder is realized, the collected dust is recycled by 100 percent, the waste is changed into the valuable, and the production cost of the carbon brick is obviously lower.
The silicon powder used in the invention can react in situ in the carbon brick to form SiC or Si under the high-temperature carbon-buried roasting condition3N4The in-situ ceramic phase is filled in the holes in the matrix, so that the compression strength and the microporosity rate of the prepared carbon brick are improved. The superfine crystalline flake graphite and the silicon micropowder are added, so that the generation of a SiC high-thermal-conductivity ceramic phase in the carbon brick can be promoted, and the microporosity rate and the thermal conductivity coefficient of the prepared carbon brick can be improved. In addition, the silicon carbide powder is directly added, and the silicon carbide has high heat conductivity coefficient and excellent molten iron corrosion resistance, which is beneficial to improving the heat conductivity coefficient and the molten iron corrosion resistance of the prepared carbon brick。
The invention adopts the mixing process of an Aili strong countercurrent mixer, the stirring head and the cylinder rotate in countercurrent, the substrate part in the invention does not need to be mixed in advance, and the production process is simplified; and the wet mixing time after adding the resin is greatly shortened, and the production efficiency is improved. The change of the mixing process improves the mixing efficiency and the mixing uniformity, improves the density of the formed carbon brick and ensures that the baked carbon brick has better microporosity rate.
The environment-friendly high-strength carbon brick for the blast furnace, prepared by the invention, is detected as follows: the normal temperature compressive strength is more than 70 MPa; a <1 μm pore volume fraction of greater than 80%; the heat conductivity at normal temperature is more than 20W/(m.K); the molten iron corrosion resistance index is less than 10%.
Therefore, the process is simple, the cost is low, the environment is protected, and the prepared environment-friendly high-strength carbon brick for the blast furnace has the characteristics of high strength, high thermal conductivity and excellent molten iron corrosion resistance.
Detailed Description
The invention is further described with reference to specific embodiments, without limiting its scope.
In order to avoid repetition, the following raw materials and related technical parameters related to this specific embodiment are uniformly described, and are not described in detail in the embodiments:
example 1
The mixed dust collecting powder is prepared by mixing the following dust collected by a dust remover in the material mixing process, the crushing process and the machining process according to the mass ratio of 1: 1: 3 is obtained after being placed in a three-screw mixer for mixing for 1 hour, the C content of the mixed dust-collecting powder is more than 80 parts, and the content of the mixed dust-collecting powder with the granularity of less than 0.075mm is more than 75 percent.
The roasting fragments are obtained by crushing and screening waste carbon bricks after high-temperature roasting or recycled old carbon bricks, and the grading particle size length of the roasting fragments comprises the following parts by weight: 25-35 parts of particles with the particle size of 6-4 mm, 20-30 parts of particles with the particle size of 4-2 mm, 20-30 parts of particles with the particle size of 2-1 mm, 20-25 parts of particles with the particle size of 1-0.2 mm, and the content of C in roasted particles is more than 85 parts. The granularity of the silicon carbide powder is less than 0.045mm, and the SiC content in the silicon carbide powder is more than 97 parts.
The granularity of the silicon powder is less than 0.045mm, and the Si content in the silicon powder is more than 95 parts.
The granularity of the superfine crystalline flake graphite is less than 0.015mm, and the content of C in the superfine crystalline flake graphite is more than 95 parts.
The granularity of the silicon micro powder is less than 0.045mm, and SiO in the silicon micro powder2The content is more than 95 parts.
An environment-friendly high-strength carbon brick for a blast furnace and a preparation method thereof. The preparation method in this example is:
the raw materials comprise the following components in parts by weight: 20 parts of mixed dust collecting powder, 5 parts of silicon carbide powder, 8 parts of silicon powder, 3 parts of ultrafine crystalline flake graphite and 3 parts of silicon micropowder which are taken as matrixes, 50 parts of roasted fragments are taken as aggregate, and 22 parts of thermosetting phenolic resin is added as a binding agent;
placing the matrix and the aggregate into an Aili powerful mixer, mixing for 1 minute, then adding the thermosetting phenolic resin, and mixing for 10 minutes; and (3) performing cold-state compression molding, drying at 110 ℃, and firing at 1200 ℃ in a carbon-buried atmosphere to obtain the environment-friendly high-strength carbon brick for the blast furnace.
The environment-friendly high-strength carbon brick for the blast furnace prepared by the embodiment is detected as follows: the normal temperature compressive strength is 72MPa, wherein the volume percentage of pores with the diameter of less than 1 mu m is 80%, the normal temperature thermal conductivity is 20W/(m.K), and the molten iron corrosion resistance index is less than 8%.
Example 2
The mixed dust collecting powder is prepared by mixing the following dust collected by a dust remover in the material mixing process, the crushing process and the machining process according to the mass ratio of 1: 1: 3, mixing the mixture in a triple-helix mixer for 1 to 2 hours to obtain the mixed dust-collecting powder, wherein the content of C in the mixed dust-collecting powder is more than 80 parts, and the granularity is less than 0.075mm and more than 75 parts.
The roasting fragments are obtained by crushing and screening waste carbon bricks after high-temperature roasting or recycled old carbon bricks, and the grading particle size length of the roasting fragments comprises the following parts by weight: 30 parts of particles with the particle size of 4mm, 25 parts of particles with the particle size of 2mm, 25 parts of particles with the particle size of 1mm and 20 parts of particles with the particle size of 1-0.2 mm, and the content of C in the roasted particles is more than 85 parts.
The granularity of the silicon carbide powder is less than 0.045mm, and the SiC content in the silicon carbide powder is more than 97 parts.
The granularity of the silicon powder is less than 0.045mm, and the Si content in the silicon powder is more than 95 parts.
The granularity of the superfine crystalline flake graphite is less than 0.015mm, and the content of C in the superfine crystalline flake graphite is more than 95 parts.
The granularity of the silicon micro powder is less than 0.045mm, and SiO in the silicon micro powder2The content is more than 95 parts.
An environment-friendly high-strength carbon brick for a blast furnace and a preparation method thereof. The preparation method in this example is:
the raw materials comprise the following components in parts by weight: 20 parts of mixed dust collecting powder, 6 parts of silicon carbide powder, 12 parts of silicon powder, 6 parts of ultrafine crystalline flake graphite and 3 parts of silicon micropowder which are taken as substrates, 53 parts of roasted fragments are taken as aggregates, and 20 parts of thermosetting phenolic resin is additionally added as a bonding agent;
placing the matrix and the aggregate in an Aili powerful mixer, mixing for 3 minutes, then adding the thermosetting phenolic resin, and mixing for 15 minutes; and (3) performing cold-state compression molding, drying at 180 ℃, and sintering at 1400 ℃ in a carbon-buried atmosphere to obtain the environment-friendly high-strength carbon brick for the blast furnace.
The environment-friendly high-strength carbon brick for the blast furnace prepared by the embodiment is detected as follows: the normal temperature compressive strength is 88MPa, the pore volume fraction of <1 mu m is 88 percent, the normal temperature thermal conductivity is 30W/(m.K), and the molten iron corrosion resistance index is less than 6 percent.
Example 3
The mixed dust collecting powder is prepared by mixing the following dust collected by a dust remover in the material mixing process, the crushing process and the machining process according to the mass ratio of 1: 1: 3 is obtained after being placed in a three-screw mixer for mixing for 1.3 hours, the C content of the mixed dust-collecting powder is more than 80 parts, and the granularity is less than 0.075mm and more than 75 parts.
The roasting fragments are obtained by crushing and screening waste carbon bricks after high-temperature roasting or recycled old carbon bricks, and the grading particle size length of the roasting fragments comprises the following parts by weight: 28 parts of particles with the particle size of 4.5mm, 25 parts of particles with the particle size of 2.5mm, 25 parts of particles with the particle size of 1.4mm and 22 parts of particles with the particle size of 0.5mm, and the content of C in the roasted particles is more than 85 parts.
The granularity of the silicon carbide powder is less than 0.045mm, and the SiC content in the silicon carbide powder is more than 97 parts.
The granularity of the silicon powder is less than 0.045mm, and the Si content in the silicon powder is more than 95 parts.
The granularity of the superfine crystalline flake graphite is less than 0.015mm, and the content of C in the superfine crystalline flake graphite is more than 95 parts.
The granularity of the silicon micro powder is less than 0.045mm, and SiO in the silicon micro powder2The content is more than 95 parts.
The raw materials comprise the following components in parts by weight: 12 parts of mixed dust collecting powder, 6.5 parts of silicon carbide powder, 11 parts of silicon powder, 3.5 parts of superfine crystalline flake graphite and 2.5 parts of silicon micropowder are taken as substrates, 59 parts of roasted fragments are taken as aggregate, and 21 parts of thermosetting phenolic resin is added as a binding agent;
placing the matrix and the aggregate in an Aili powerful mixer, mixing for 2 minutes, then adding the thermosetting phenolic resin, and mixing for 102 minutes; and (3) performing cold-state compression molding, drying at 140 ℃, and firing at 1240 ℃ in a carbon-buried atmosphere to obtain the environment-friendly high-strength carbon brick for the blast furnace.
The environment-friendly high-strength carbon brick for the blast furnace prepared by the embodiment is detected as follows: the normal-temperature compressive strength is 75-84 MPa, the pore volume fraction of <1 mu m is 84%, the normal-temperature thermal conductivity is 24W/(m.K), and the molten iron corrosion resistance index is less than 8%.
Example 4
The mixed dust collecting powder is prepared by mixing the following dust collected by a dust remover in the material mixing process, the crushing process and the machining process according to the mass ratio of 1: 1: 3 is obtained after being placed in a three-screw mixer for mixing for 1.8 hours, the C content of the mixed dust-collecting powder is more than 80 parts, and the proportion of the mixed dust-collecting powder with the granularity of less than 0.075mm is more than 75 parts.
The roasting fragments are obtained by crushing and screening waste carbon bricks after high-temperature roasting or recycled old carbon bricks, and the grading particle size length of the roasting fragments comprises the following parts by weight: 28 parts of catalyst with the grain diameter of 5.5mm, 25 parts of catalyst with the grain diameter of 3.5mm, 25 parts of catalyst with the grain diameter of 1.8mm and 22 parts of catalyst with the grain diameter of 10.8mm, and the content of C in the roasted particles is more than 85 parts.
The granularity of the silicon carbide powder is less than 0.045mm, and the SiC content in the silicon carbide powder is more than 97 parts.
The granularity of the silicon powder is less than 0.045mm, and the Si content in the silicon powder is more than 95 parts.
The granularity of the superfine crystalline flake graphite is less than 0.015mm, and the content of C in the superfine crystalline flake graphite is more than 95 parts.
The granularity of the silicon micro powder is less than 0.045mm, and SiO in the silicon micro powder2The content is more than 95 parts.
An environment-friendly high-strength carbon brick for a blast furnace and a preparation method thereof. The preparation method in this example is:
the raw materials comprise the following components in parts by weight: 58 parts of mixed dust collecting powder, 9 parts of silicon carbide powder, 9 parts of silicon powder, 5 parts of superfine crystalline flake graphite and 3 parts of silicon micropowder are taken as matrixes, 64 parts of roasted fragments are taken as aggregates, and 17 parts of thermosetting phenolic resin of the sum of the matrixes and the aggregates is taken as a binding agent;
placing the matrix and the aggregate in an Aili powerful mixer, mixing for 2.8 minutes, then adding the thermosetting phenolic resin, and mixing for 14 minutes; and (3) performing cold-state compression molding, drying at 170 ℃, and firing at 1380 ℃ in a carbon-buried atmosphere to obtain the environment-friendly high-strength carbon brick for the blast furnace.
The environment-friendly high-strength carbon brick for the blast furnace prepared by the embodiment is detected as follows: the normal temperature compression strength is 90MPa, the pore volume fraction of <1 mu m is 89%, the normal temperature thermal conductivity is 30W/(m.K), and the molten iron corrosion resistance index is less than 5%.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following positive effects:
the aggregate used in the invention is mainly roasted fragments which are obtained by crushing roasted waste carbon bricks, belongs to the reutilization of waste resources, changes waste into valuable, and effectively reduces the production cost of the carbon bricks. The waste carbon brick is roasted at high temperature, and the main components of the roasted fragments obtained by crushing are carbon and silicon carbide, so that compared with the traditional raw material of electrically calcined anthracite, the waste carbon brick has higher particle strength and no large holes; the roasted fragments are used as carbon brick aggregates, and the method has positive effects on improving the strength, the microporosity rate, the heat conductivity coefficient and the molten iron corrosion resistance of the prepared carbon bricks.
The substrate used in the invention is mainly mixed dust collecting powder, which is obtained by mixing dust collected in the material preparing process, the crushing process and the machining process of the dust remover. Because the particle sizes of the dust collected by the dust remover are different, about 0.5mm, and the dust cannot be directly utilized, the dust collector adopts the triple-spiral mixer to pre-mix the dust collected in different processes, the homogenization of the particle sizes of the mixed dust-collecting powder is realized, the collected dust is recycled by 100 percent, the waste is changed into valuable, and the production cost of the carbon brick is obviously lower.
The silicon powder used in the invention can react in situ in the carbon brick to form SiC or Si under the high-temperature carbon-buried roasting condition3N4The in-situ ceramic phase is filled in the holes in the matrix, so that the compression strength and the microporosity rate of the prepared carbon brick are improved. The superfine crystalline flake graphite and the silicon micropowder are added, so that the generation of a SiC high-thermal-conductivity ceramic phase in the carbon brick can be promoted, and the microporosity rate and the thermal conductivity coefficient of the prepared carbon brick can be improved. In addition, the silicon carbide powder is directly added, and the silicon carbide has high heat conductivity coefficient and excellent molten iron corrosion resistance, which is beneficial to improving the heat conductivity coefficient and the molten iron corrosion resistance of the prepared carbon brick.
The invention adopts the mixing process of an Aili strong countercurrent mixer, the stirring head and the cylinder rotate in countercurrent, the substrate part in the invention does not need to be mixed in advance, and the production process is simplified; and the wet mixing time after adding the resin is greatly shortened, and the production efficiency is improved. The change of the mixing process improves the mixing efficiency and the mixing uniformity, improves the density of the formed carbon brick and ensures that the baked carbon brick has better microporosity rate.
The environment-friendly high-strength carbon brick for the blast furnace, prepared by the invention, is detected as follows: the normal temperature compressive strength is more than 70 MPa; a <1 μm pore volume fraction of greater than 80%; the heat conductivity at normal temperature is more than 20W/(m.K); the molten iron corrosion resistance index is less than 10%.
Therefore, the process is simple, the cost is low, the environment is protected, and the prepared environment-friendly high-strength carbon brick for the blast furnace has the characteristics of high strength, high thermal conductivity and excellent molten iron corrosion resistance.
Claims (8)
1. The environment-friendly high-strength carbon brick for the blast furnace is characterized by comprising the following raw materials in parts by weight: 5-20 parts of mixed dust collecting powder, 4-8 parts of silicon carbide powder, 8-12 parts of silicon powder, 3-6 parts of ultrafine flake graphite and 1-2 parts of silicon micropowder as a matrix.
2. The environment-friendly high-strength carbon brick for the blast furnace according to claim 1, wherein the mixed dust-collecting powder is prepared by mixing dust collected by a dust collector in a material mixing process, a crushing process and a machining process according to a mass ratio of 1: 1: and 3, mixing the mixture in a triple-helix mixer for 1-2 hours to obtain the mixed dust-collecting powder, wherein the ratio of the C content of the mixed dust-collecting powder to the total mass of the dust-collecting powder is more than 80 parts, and the number of the particles with the particle size of less than 0.075mm is more than 75 parts.
3. The environment-friendly high-strength carbon brick for the blast furnace according to claim 1, wherein the particle size of the silicon carbide powder is less than 0.045mm, and the SiC content in the silicon carbide powder is more than 97 parts.
4. The environment-friendly high-strength carbon brick for the blast furnace according to claim 1, wherein the particle size of the silicon powder is less than 0.045mm, and the content of Si in the silicon powder is more than 95 parts.
5. The environment-friendly high-strength carbon brick for a blast furnace according to claim 1, wherein the particle size of the ultrafine flake graphite is less than 0.015mm, and the content of C in the ultrafine flake graphite is more than 95 parts.
6. The environment-friendly high-strength carbon brick for blast furnaces as claimed in claim 1, wherein the particle size of the silica micro powder is less than 0.045mm, and SiO in the silica micro powder2The content is more than 95 parts.
7. The method for preparing the environment-friendly high-strength carbon brick for the blast furnace according to claim 1, wherein 50-65 parts of roasted fragments with the roasted fragment content are used as aggregate, and 15-25 parts of thermosetting phenolic resin is used as a bonding agent; placing the substrate and the aggregate into an Aili strong countercurrent mixer, mixing for 1-3 minutes, then adding the thermosetting phenolic resin, and mixing for 10-15 minutes; and (3) performing cold-state compression molding, drying at 110-180 ℃, and sintering at 1200-1400 ℃ in a carbon-buried atmosphere to obtain the environment-friendly high-strength carbon brick for the blast furnace.
8. The method for preparing environment-friendly high-strength carbon bricks for blast furnaces according to claim 8, wherein the roasted crushed waste carbon bricks or recycled old carbon bricks are obtained by crushing and screening, and the grading particle size of the roasted crushed waste carbon bricks comprises the following parts by weight: 25-35 parts of particles with the particle size of 6-4 mm, 20-30 parts of particles with the particle size of 4-2 mm, 20-30 parts of particles with the particle size of 2-1 mm, 20-25 parts of particles with the particle size of 1-0.2 mm, and the content of C in roasted particles is more than 85 parts.
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| JPS6395157A (en) * | 1986-10-08 | 1988-04-26 | 新日本製鐵株式会社 | Manufacture of silicon carbide-carbon base brick for ore reduction furnace wall |
| JPH06191942A (en) * | 1992-12-25 | 1994-07-12 | Akechi Ceramics Kk | Carbonaceous refractory for lining blast furnace |
| CN1683280A (en) * | 2004-04-15 | 2005-10-19 | 兰州海龙新材料科技股份有限公司 | High heat conductivity carbon brick for blast furnace and its producing method |
| JP2018058720A (en) * | 2016-10-04 | 2018-04-12 | 黒崎播磨株式会社 | Brick for blast furnace hearth, blast furnace hearth using the same, and method for producing brick for blast furnace hearth |
| CN108585863A (en) * | 2018-05-04 | 2018-09-28 | 武汉科技大学 | A kind of high intensity ultramicropore electric forging coal base brick fuel and preparation method thereof |
| CN112028653A (en) * | 2020-09-11 | 2020-12-04 | 武汉钢铁有限公司 | High-thermal-conductivity and corrosion-resistant self-protecting carbon brick for blast furnace and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS6395157A (en) * | 1986-10-08 | 1988-04-26 | 新日本製鐵株式会社 | Manufacture of silicon carbide-carbon base brick for ore reduction furnace wall |
| JPH06191942A (en) * | 1992-12-25 | 1994-07-12 | Akechi Ceramics Kk | Carbonaceous refractory for lining blast furnace |
| CN1683280A (en) * | 2004-04-15 | 2005-10-19 | 兰州海龙新材料科技股份有限公司 | High heat conductivity carbon brick for blast furnace and its producing method |
| JP2018058720A (en) * | 2016-10-04 | 2018-04-12 | 黒崎播磨株式会社 | Brick for blast furnace hearth, blast furnace hearth using the same, and method for producing brick for blast furnace hearth |
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