CN110981447A - Carbon composite anhydrous stemming for large-scale blast furnace and preparation method thereof - Google Patents

Carbon composite anhydrous stemming for large-scale blast furnace and preparation method thereof Download PDF

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CN110981447A
CN110981447A CN201911325844.2A CN201911325844A CN110981447A CN 110981447 A CN110981447 A CN 110981447A CN 201911325844 A CN201911325844 A CN 201911325844A CN 110981447 A CN110981447 A CN 110981447A
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powder
parts
blast furnace
meshes
equal
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丁丰收
晁尚奎
李旭柯
贺晓杰
校小帅
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REWELL REFRACTORY (ZHENGZHOU) CO Ltd
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REWELL REFRACTORY (ZHENGZHOU) CO Ltd
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Abstract

The invention discloses a carbon composite anhydrous stemming for a large blast furnace, which is prepared from high bauxite, electric melting brown corundum, silicon carbide, silicon nitride iron, Guangxi white mud, kyanite, coke powder, asphalt powder, carbon black N990, Beta resin powder, metal aluminum powder, metal silicon powder and an additional binding agent according to the following method: a mixing and grinding machine with a heating function is adopted, the temperature is preheated to 50-60 ℃, the granules are poured into a dry mixer for 2 minutes, and then half of the external binding agent is added for wet mixing and grinding for 10 minutes; and then adding the rest powder together, continuously rolling for 5 minutes, pouring the rest binding agent into the mixture, continuously stirring for 10-15 minutes to ensure that the raw materials and the binding agent are fully and uniformly stirred to form pug, preparing the pug into blocky anhydrous stemming through a pug extruder, and packaging and warehousing. The invention has scientific and environment-friendly ingredients, small shrinkage of the finished stemming, high strength, excellent erosion resistance and corrosion resistance, can be friendly combined with the wall of the blast furnace, protects the wall of the blast furnace, can realize one-time tapping time of 150-200 minutes, and improves the tapping time of the stemming.

Description

Carbon composite anhydrous stemming for large-scale blast furnace and preparation method thereof
Technical Field
The invention relates to a refractory material, in particular to carbon composite anhydrous stemming for a large-scale blast furnace and a preparation method of the stemming.
Background
The stemming is a refractory material for plugging a blast furnace taphole, and comprises three parts: refractory aggregate, refractory powder and a bonding agent. Water-containing stemming in which water is used as a binder, and anhydrous stemming in which organic materials such as tar and resin are used as binders. The anhydrous stemming is generally used on large and medium blast furnaces with high top pressure and high enhanced smelting degree.
Along with the continuous development of blast furnace iron-making scale, the volume of a blast furnace is continuously enlarged, the hot air temperature of the blast furnace and the pressure of the top of the blast furnace are increased, the quality of iron-making fuel, namely coke, is reduced, the working environment of a blast furnace taphole is poorer and poorer, and the erosion and the scouring of high-temperature slag on the blast furnace taphole are more and more serious; on the other hand, as the blast furnace iron making is developed to be large-scale, the smelting conditions are more and more strict, the carbon composite bricks on the wall of the blast furnace are eroded too fast, and particularly, the concave surfaces are formed on the wall around the tap hole, so that the service life of the blast furnace is shortened.
In view of this, it is a research direction of technicians in the refractory industry to research a stemming which has the same quality as the brick material of the blast furnace wall and better associativity so as to effectively protect the blast furnace wall brick and meet the requirements of the iron-making industry.
Content providing method and apparatus
The invention aims to provide a carbon composite anhydrous stemming for a large-scale blast furnace and a preparation method of the stemming. The stemming prepared by the invention can be well combined with the wall of the blast furnace, so that the periphery of the furnace wall is protected from erosion, the tapping time of the blast furnace is long, and the service life of the blast furnace is prolonged.
In order to achieve the purpose, the invention can adopt the following technical scheme:
the carbon composite anhydrous stemming for the large blast furnace is prepared from raw materials including high bauxite, electric melting brown corundum, silicon carbide, silicon nitride iron, Guangxi white mud, kyanite, coke powder, asphalt powder, carbon black N990, Beta resin powder, metal aluminum powder, metal silicon powder and an external binding agent in parts by weight as follows:
20-30 parts of bauxite particles with the granularity of 1-3 mm;
20-28 parts of fused brown corundum, wherein 15-20 parts of fused brown corundum granules with the granularity of 0-1 mm and 5-8 parts of fused brown corundum powder with the granularity of 320 meshes are used;
15-20 parts of silicon carbide powder with the particle size of 200 meshes;
8-12 parts of ferrosilicon nitride powder with the granularity of 200 meshes;
3-5 parts of Guangxi white mud powder with the granularity of 180 meshes,
3-5 parts of kyanite powder with the granularity of 80 meshes;
6-10 parts of coke powder with the particle size of 0.5-2 mm;
3-5 parts of asphalt powder with the granularity of 180 meshes;
1-3 parts of carbon black N990 powder with the granularity of 200 meshes;
1-3 parts of Beta resin powder with the granularity of 200 meshes;
0.01-0.012 part of metal aluminum powder with the granularity of 180 meshes;
1-1.5 parts of metal silicon powder with the particle size of 200 meshes;
the dosage of the additional bonding agent is 13-16% of the total amount of the materials.
In order to ensure that the finished stemming meets the use requirements, the raw materials used in the invention meet the following quality standards:
the additional binding agent is prepared from a carbon-containing resin binding agent (Carobest 60) and a novel phenolic resin binding agent (PF 5100) in a weight ratio of 1: 1.
The high-alumina bauxite used in the invention contains Al2O3More than or equal to 85 percent; fe in the used electric melting brown corundum2O3≤0.5%，Al2O3≥94.5%。
The coke powder used in the invention contains more than or equal to 88 percent of C and less than or equal to 11 percent of ash.
The SiC in the silicon carbide used by the invention is more than or equal to 90 percent, and the Si in the silicon nitride iron3N4Fe≥95%。。
The expansion rate of the kyanite used in the invention at 1350 ℃ is 13-16%, and for ensuring the quality, kyanite imported from Australia can be crushed and ground into powder.
The water content of the Guangxi white mud used in the invention is less than or equal to 2.5 percent.
The softening point of the asphalt powder used in the invention is more than or equal to 120 ℃, wherein the carbon content is more than or equal to 50%; the carbon content in the carbon black N990 is more than or equal to 95 percent.
The Beta resin powder used in the invention has a carbon content of more than or equal to 60 percent and a Beta resin content of more than or equal to 25 percent. Beta resin powder is a soft carbon binder, provides isotropic bonding strength for carbon-containing refractory materials, and is produced by manufacturers such as Tianjin Nao Tak technologies, Inc.
The Al content in the metal aluminum powder used in the invention is more than or equal to 99 percent; the Si content in the used metal silicon powder is more than or equal to 98 percent.
The preparation method of the carbon composite anhydrous stemming for the large-scale blast furnace comprises the following steps:
cleaning and preheating the mixing mill to 50-60 ℃ by adopting a mixing mill with a heating function, firstly pouring the granules into the dry mixer for 2 minutes, and then adding half of the external binding agent for wet mixing and milling for 10 minutes; and then adding the rest powder together, continuously rolling for 5 minutes, pouring the rest binding agent into the mixture, continuously stirring for 10-15 minutes to ensure that the raw materials and the binding agent are fully and uniformly stirred to form pug, preparing the pug into blocky anhydrous stemming through a pug extruder, and packaging and warehousing.
The mud discharging temperature of the mud is more than or equal to 50 ℃, and the finished anhydrous stemming is cuboid and 7-8 kg in each block.
Tests prove that the technical parameters of the finished anhydrous stemming prepared by the invention are as follows:
Figure DEST_PATH_IMAGE001
the invention has the advantages that the ingredients are scientific and environment-friendly, the prepared finished stemming is small in shrinkage, high in strength, excellent in erosion resistance and corrosion resistance, and capable of being friendly combined with the wall of a blast furnace to protect the wall of the blast furnace, the one-time tapping time can reach 150-200 minutes, and the tapping time of the stemming is improved. Specifically, the method comprises the following steps:
the use of various carbon-containing raw materials improves the erosion resistance of the stemming; the ferrosilicon nitride is added, so that the erosion resistance of the finished anhydrous stemming is improved; the binding agent adopts the carbon-containing resin and the phenolic resin for matching use, thereby reducing the pollution of the stemming, reducing the generation of carcinogenic substances, improving the operation environment in front of the blast furnace and being more beneficial to environmental protection.
When the stemming is prepared, the feeding sequence of the granular material, 50 percent of the bonding agent, powder and 50 percent of the bonding agent is adopted, so that the granular material, the powder and the bonding agent are more favorably and uniformly mixed. Through multiple production verification, the finished stemming obtained by the charging sequence has higher density and higher strength.
Detailed Description
The present invention is described in more detail below with reference to specific examples to facilitate understanding for those skilled in the art.
EXAMPLE 1 preparation of 2000m3Carbon composite anhydrous stemming for blast furnace
First, raw material ratio
30 parts of high-aluminum granular material with the particle size of 1-3 mm, 15 parts of brown corundum granular material with the particle size of 0-1 mm, 8 parts of brown corundum powder with the particle size of 320 meshes, 15 parts of silicon carbide powder with the particle size of 200 meshes, 8 parts of ferrosilicon nitride powder with the particle size of 200 meshes, 5 parts of Guangxi white mud powder with the particle size of 180 meshes, 5 parts of cyanite powder with the particle size of 80 meshes, 7 parts of coke powder with the particle size of 0.5-2 mm, 5 parts of asphalt powder with the particle size of 180 meshes, 1 part of carbon black N990 powder with the particle size of 200 meshes, 1 part of Beta resin powder with the particle size of 200 meshes, 0.01 part of added metal aluminum powder and 1.2 parts;
the additional binding agent adopts a carbon-containing resin binding agent Carobest 60 accounting for 8 percent of the total material and a novel phenolic resin binding agent PF5100 accounting for 8 percent of the total material.
Second, preparation method
Adopting a mixing mill with a heating function (LNX-2000 type mixing mill produced by Nanchang Star fire machine tool Co., Ltd.) to clean the mixing mill and preheat to 50 ℃, pouring granules (high-aluminum granules, brown corundum granules and coke powder) into the mixing mill for dry mixing for 2 minutes, and adding carbon-containing resin Carobest 60 for wet milling for 10 minutes; then all the rest powder materials are added together and continuously rolled for 5 minutes, and finally, the novel phenolic resin PF5100 is added to continuously roll and stir for 15 minutes, so that the mixture and the binding agent are fully and uniformly stirred to form pug; keeping the mud discharging temperature at 54 +/-1 ℃, preparing the cuboid anhydrous stemming by a mud extruder, wherein each stemming weighs 7-8 kg, and packaging and warehousing.
Through tests, the technical parameters of the prepared anhydrous stemming finished product are as follows:
Figure 820934DEST_PATH_IMAGE002
it is applied at 2000m3At a blast furnace taphole, the tapping time is 150-170 minutes after long-term on-site tracking, the tapping time is long, stemming is stable in the using process, can be friendly-combined with the blast furnace wall, is easy to open, blocks mud, almost has no waste gas, can effectively improve the environment in front of the blast furnace, and is very environment-friendly.
Example 2 preparation 2500m3Carbon composite anhydrous stemming for blast furnace
Firstly, raw material proportioning:
25 parts of high-aluminum granular material with the particle size of 1-3 mm, 18 parts of brown corundum granular material with the particle size of 0-1 mm, 5 parts of brown corundum powder with the particle size of 320 meshes, 20 parts of silicon carbide powder with the particle size of 200 meshes, 10 parts of ferrosilicon nitride powder with the particle size of 200 meshes, 4 parts of Guangxi white mud powder with the particle size of 180 meshes, 5 parts of cyanite powder with the particle size of 80 meshes, 6 parts of coke powder with the particle size of 0.5-2 mm, 4 parts of asphalt powder with the particle size of 180 meshes, 2 parts of carbon black N990 powder with the particle size of 200 meshes, 1 part of Beta resin powder with the particle size of 200 meshes, 0.012 part of added metal aluminum powder and 1.0;
the additional binding agent adopts a carbon-containing resin binding agent Carobest 60 accounting for 7.5 percent of the total amount of materials and a novel phenolic resin binding agent PF5100 accounting for 7.5 percent of the total amount of materials.
Second, preparation method
Adopting a mixing mill with a heating function (same as the embodiment 1), cleaning the mixing mill, preheating to 50 ℃, pouring granules (high-aluminum granules, brown corundum granules and coke powder) into the mixing mill for dry mixing for 2 minutes, and adding carbon-containing resin Carobest 60 for wet milling for 10 minutes; then all the rest powder materials are added together and continuously rolled for 5 minutes, and finally, the novel phenolic resin PF5100 is added to continuously roll and stir for 15 minutes, so that the mixture and the binding agent are fully and uniformly stirred to form pug; keeping the mud discharging temperature at 52 +/-1 ℃, preparing the cuboid anhydrous stemming by a mud extruder, wherein each stemming weighs 7-8 kg, and packaging and warehousing.
Through tests, the technical parameters of the prepared anhydrous stemming finished product are as follows:
Figure DEST_PATH_IMAGE003
it is applied at 2500m3The tapping time is 160-190 minutes, the tapping time is long, the stemming is stable in the using process, can be friendly-combined with the blast furnace wall, is easy to open, blocks up the mud, almost has no waste gas, can effectively improve the environment in front of the blast furnace, and is very environment-friendly.
EXAMPLE 3 preparation of 3000m3Carbon composite anhydrous stemming for blast furnace
Firstly, raw material proportioning:
20 parts of high-aluminum granular material with the particle size of 1-3 mm, 20 parts of brown corundum granular material with the particle size of 0-1 mm, 6 parts of brown corundum powder with the particle size of 320 meshes, 18 parts of silicon carbide powder with the particle size of 200 meshes, 12 parts of ferrosilicon nitride powder with the particle size of 200 meshes, 3 parts of Guangxi white mud powder with the particle size of 180 meshes, 3 parts of cyanite powder with the particle size of 80 meshes, 10 parts of coke powder with the particle size of 0.5-2 mm, 4 parts of asphalt powder with the particle size of 180 meshes, 2 parts of carbon black N990 powder with the particle size of 200 meshes, 2 parts of Beta resin powder with the particle size of 200 meshes, 0.01 part of added metal aluminum powder and 1 part;
the additional binding agent adopts a carbon-containing resin binding agent Carobest 60 accounting for 6.5 percent of the total amount of the materials and a novel phenolic resin binding agent PF5100 accounting for 6.5 percent of the total amount of the materials;
second, preparation method
The same as in example 1.
Through tests, the technical parameters of the prepared anhydrous stemming finished product are as follows:
Figure 613441DEST_PATH_IMAGE004
it is applied at 3000m3The tapping time of the blast furnace tapping hole is 180-200 minutes after long-term on-site tracking use, the tapping time is long, the stemming is stable in a mud bag in the use process, and the stemming can be friendly to the blast furnace wallThe combination is easy to open, blocks mud, almost has no waste gas, can effectively improve the environment in front of the blast furnace and is very environment-friendly.
EXAMPLE 4 preparation of 4000m3Carbon composite anhydrous stemming for blast furnace
Firstly, raw material proportioning:
20 parts of high-aluminum granular material with the particle size of 1-3 mm, 20 parts of brown corundum granular material with the particle size of 0-1 mm, 5 parts of brown corundum powder with the particle size of 320 meshes, 20 parts of silicon carbide powder with the particle size of 200 meshes, 12 parts of ferrosilicon nitride powder with the particle size of 200 meshes, 3 parts of Guangxi white mud powder with the particle size of 180 meshes, 3 parts of cyanite powder with the particle size of 80 meshes, 8 parts of coke powder with the particle size of 0.5-2 mm, 3 parts of asphalt powder with the particle size of 180 meshes, 3 parts of carbon black N990 powder with the particle size of 200 meshes, 3 parts of Beta resin powder with the particle size of 200 meshes, 0.01 part of added metal aluminum powder and 1.5;
the additional binding agent adopts a carbon-containing resin binding agent Carobest 60 accounting for 7 percent of the total amount of the materials and a novel phenolic resin binding agent PF5100 accounting for 7 percent of the total amount of the materials;
second, preparation method
The same as in example 1.
Through tests, the technical parameters of the prepared anhydrous stemming finished product are as follows:
Figure DEST_PATH_IMAGE005
it was used at 4000m3The tapping time is 180-200 minutes, the tapping time is long, the stemming is stable in the using process, can be friendly-combined with the blast furnace wall, is easy to open, blocks up the mud, almost has no waste gas, can effectively improve the environment in front of the blast furnace, and is very environment-friendly.

Claims (10)

1. The carbon composite anhydrous stemming for the large blast furnace is characterized by comprising the following components in parts by weight: the material is prepared from raw materials of high bauxite, electric melting brown fused alumina, silicon carbide, ferrosilicon nitride, Guangxi white mud, kyanite, coke powder, asphalt powder, carbon black N990, Beta resin powder, metal aluminum powder, metal silicon powder and an external bonding agent according to the following weight parts:
20-30 parts of bauxite particles with the granularity of 1-3 mm;
20-28 parts of fused brown corundum, wherein 15-20 parts of fused brown corundum granules with the granularity of 0-1 mm and 5-8 parts of fused brown corundum powder with the granularity of 320 meshes are used;
15-20 parts of silicon carbide powder with the particle size of 200 meshes;
8-12 parts of ferrosilicon nitride powder with the granularity of 200 meshes;
3-5 parts of Guangxi white mud powder with the granularity of 180 meshes,
3-5 parts of kyanite powder with the granularity of 80 meshes;
6-10 parts of coke powder with the particle size of 0.5-2 mm;
3-5 parts of asphalt powder with the granularity of 180 meshes;
1-3 parts of carbon black N990 powder with the granularity of 200 meshes;
1-3 parts of Beta resin powder with the granularity of 200 meshes;
0.01-0.012 part of metal aluminum powder with the granularity of 180 meshes;
1-1.5 parts of metal silicon powder with the particle size of 200 meshes;
the dosage of the additional bonding agent is 13-16% of the total amount of the materials.
2. The carbon composite anhydrous stemming for the large-scale blast furnace according to claim 1, which is characterized in that: the additional binding agent is prepared from a carbon-containing resin binding agent and a novel phenolic resin binding agent in a weight ratio of 1: 1.
3. The carbon composite anhydrous stemming for the large-scale blast furnace according to claim 1, which is characterized in that: al in the high-alumina bauxite2O3More than or equal to 85 percent; fe in the electric melting brown corundum2O3≤0.5%，Al2O3≥94.5%。
4. The carbon composite anhydrous stemming for the large-scale blast furnace according to claim 1, which is characterized in that: the C content in the coke powder is more than or equal to 88 percent, and the ash content is less than or equal to 11 percent.
5. The carbon composite anhydrous stemming for the large-scale blast furnace according to claim 1, which is characterized in that: SiC in the silicon carbide is more than or equal to 90 percent, and Si in the silicon nitride iron3N4Fe≥95%。
6. The carbon composite anhydrous stemming for the large-scale blast furnace according to claim 1, which is characterized in that: the expansion rate of the kyanite at 1350 ℃ is 13-16%; the water content in the Guangxi white mud is less than or equal to 2.5 percent.
7. The carbon composite anhydrous stemming for the large-scale blast furnace according to claim 1, which is characterized in that: the softening point of the asphalt powder is more than or equal to 120 ℃, wherein the carbon content is more than or equal to 50%; the carbon content of the carbon black N990 is more than or equal to 95%, the carbon content of the Beta resin powder is more than or equal to 60%, and the content of the Beta resin is more than or equal to 25%.
8. The carbon composite anhydrous stemming for the large-scale blast furnace according to claim 1, which is characterized in that: al in the metal aluminum powder is more than or equal to 99 percent; si in the metal silicon powder is more than or equal to 98 percent.
9. The method for preparing the carbon composite anhydrous stemming for the large-scale blast furnace as recited in claim 1, characterized in that:
cleaning and preheating the mixing mill to 50-60 ℃ by adopting a mixing mill with a heating function, firstly pouring the granules into the dry mixer for 2 minutes, and then adding half of the external binding agent for wet mixing and milling for 10 minutes; and then adding the rest powder together, continuously rolling for 5 minutes, pouring the rest binding agent into the mixture, continuously stirring for 10-15 minutes to ensure that the raw materials and the binding agent are fully and uniformly stirred to form pug, preparing the pug into blocky anhydrous stemming through a pug extruder, and packaging and warehousing.
10. The method for preparing the carbon composite anhydrous stemming for the large-scale blast furnace according to claim 9, which is characterized by comprising the following steps: the mud discharging temperature of the mud is more than or equal to 50 ℃, and the finished anhydrous stemming is cuboid and 7-8 kg in each block.
CN201911325844.2A 2019-12-20 2019-12-20 Carbon composite anhydrous stemming for large-scale blast furnace and preparation method thereof Pending CN110981447A (en)

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