CN115819096A - Tundish breathable upper nozzle, breathable lining material used for tundish breathable upper nozzle and preparation method of breathable lining material - Google Patents
Tundish breathable upper nozzle, breathable lining material used for tundish breathable upper nozzle and preparation method of breathable lining material Download PDFInfo
- Publication number
- CN115819096A CN115819096A CN202211612554.8A CN202211612554A CN115819096A CN 115819096 A CN115819096 A CN 115819096A CN 202211612554 A CN202211612554 A CN 202211612554A CN 115819096 A CN115819096 A CN 115819096A
- Authority
- CN
- China
- Prior art keywords
- breathable
- lining material
- tundish
- upper nozzle
- white corundum
- 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
- 239000000463 material Substances 0.000 title claims abstract description 147
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000002245 particle Substances 0.000 claims abstract description 53
- 239000010431 corundum Substances 0.000 claims abstract description 46
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 46
- 239000002994 raw material Substances 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 20
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 19
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 13
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims abstract description 13
- 239000005350 fused silica glass Substances 0.000 claims abstract description 13
- 229910052726 zirconium Inorganic materials 0.000 claims abstract description 13
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 11
- 239000010439 graphite Substances 0.000 claims abstract description 11
- 229910052580 B4C Inorganic materials 0.000 claims abstract description 10
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims abstract description 10
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000005011 phenolic resin Substances 0.000 claims abstract description 8
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 39
- 238000002156 mixing Methods 0.000 claims description 31
- 230000032683 aging Effects 0.000 claims description 22
- 229910052799 carbon Inorganic materials 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 11
- 238000000462 isostatic pressing Methods 0.000 claims description 9
- 238000004898 kneading Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 8
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 229910052710 silicon Inorganic materials 0.000 claims description 7
- 239000010703 silicon Substances 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 6
- 238000010304 firing Methods 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 230000035699 permeability Effects 0.000 abstract description 14
- 230000035939 shock Effects 0.000 abstract description 12
- 230000003628 erosive effect Effects 0.000 abstract description 11
- 239000011819 refractory material Substances 0.000 abstract description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 23
- 239000010959 steel Substances 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 12
- 239000011148 porous material Substances 0.000 description 10
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 6
- 235000010299 hexamethylene tetramine Nutrition 0.000 description 6
- 238000007493 shaping process Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229910052786 argon Inorganic materials 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 239000000945 filler Substances 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 241000227425 Pieris rapae crucivora Species 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 239000013590 bulk material Substances 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 239000007858 starting material Substances 0.000 description 2
- 229910052845 zircon Inorganic materials 0.000 description 2
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention belongs to the technical field of refractory materials, and particularly relates to a tundish breathable upper nozzle, a breathable lining material used for the tundish breathable upper nozzle and a preparation method of the breathable lining material. The tundish breathable upper nozzle and the breathable lining material used by the tundish breathable upper nozzle are composed of the following raw materials in percentage by mass and phenolic resin accounting for 8-12% of the total mass of the raw materials: 35-50% of white corundum particles, 10-15% of white corundum fine powder, 10-15% of large-scale graphite, 5-10% of zirconium mullite, 5-10% of fused quartz, 1-3% of silicon metal, 0.5-1% of boron carbide, 2-5% of urotropine and 2-4.5% of aluminum hydroxide. The tundish breathable upper nozzle and the breathable lining material used by the tundish breathable upper nozzle have the advantages of high porosity, good air permeability, good thermal shock stability, good erosion resistance and high strength.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a tundish breathable upper nozzle, a breathable lining material used for the tundish breathable upper nozzle and a preparation method of the breathable lining material.
Background
The tundish, which is the last vessel that the molten steel passes through before it solidifies into a billet in a continuous casting system, has a significant effect on the quality of the billet and should be kept as liquid as possible to exclude non-metallic inclusions from the steel. Argon is blown into molten steel through a tundish water feeding port to promote inclusions in the molten steel to float upwards, and the method is one of important metallurgical means.
The tundish breathable upper nozzle is arranged in a continuous casting tundish, and the bowl part (upper part) is matched with the stopper rod to control the flow of molten steel from the tundish to the crystallizer. The surface (lower part) of the slide plate is matched with the submerged nozzle to control the molten steel to be stably injected into the crystallizer. The middle part is divided into three layers: the inner layer is made of air permeable material, the middle layer is an air chamber, and the outer layer is made of body material. Argon enters the gas chamber through the argon blowing hole, and then is blown into molten steel through the breathable lining material to adhere impurities to float upwards, so that the aim of purifying the molten steel is fulfilled.
The air permeability of the air permeable lining material is an important measure of the air permeability, which necessarily requires that the material has a high porosity, especially a high number of through-air channels. Meanwhile, the material is ensured to have good thermal shock stability, erosion resistance, corrosion resistance and certain strength.
The main problems of the prior tundish upper nozzle breathable lining material are as follows: (1) The non-carbon gas-permeable tundish water feeding port is characterized in that the gas-permeable lining material is formed by independently forming by an oil press with the forming pressure of more than 1000KN and is assembled with other materials such as a bowl material and an outer layer material, and the connection part of different materials is a weak link and is easy to leak gas and infiltrate steel. Because the carbon is not contained, the thermal shock stability is poor, and the steel is easy to crack, so that the steel penetrating accident is caused; the permeability of molten steel and impurities is poor, pores are blocked, and the air permeability is influenced. (2) The carbon-containing permeable tundish upper nozzle and the permeable lining material are formed integrally with other materials by isostatic pressing, so that the existence of weak links is avoided, and the defects of low permeability, low strength and poor scouring resistance are existed due to high carbon content, good thermal shock stability, good erosion resistance and good molten steel and inclusion permeability resistance.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the tundish breathable upper nozzle and the breathable lining material used by the same are provided, and have high porosity, good breathability, good thermal shock stability, good erosion resistance and high strength; the invention also provides a tundish breathable upper nozzle prepared by the preparation method.
The invention relates to a tundish breathable upper nozzle and a breathable lining material used by the same, which are composed of the following raw materials in percentage by mass and phenolic resin accounting for 8-12% of the total mass of the raw materials:
in the invention, the white corundum particles are plastic white corundum particles, and the mass content of alumina in the white corundum particles and the white corundum fine powder is more than 98.5%. Wherein the white corundum particles consist of particles with the granularity of 24 meshes and the granularity of 36 meshes, and the mass ratio of the white corundum particles to the white corundum particles is 1 (1-2); the granularity of the white corundum fine powder is below 120 meshes.
The shaped white corundum particles used as the framework are approximately spherical and have the same particle diameter, and the size and the distribution of gaps formed by stacking are uniform. The air permeability is also good because the pores left when the urotropine volatilizes and the aluminum hydroxide fine powder decomposes are uniformly distributed and have a high porosity.
In the invention, the mass content of carbon in the large flake graphite is more than 98%, and the granularity is between 0.15 and 0.30 mm.
In the invention, the granularity of the zirconium mullite is between 0.02 and 0.2 mm; the chemical components of the zirconium mullite are as follows: al (aluminum) 2 O 3 45-50wt.％，ZrO 2 35-40wt.％，SiO 2 15-20wt.％。
In the present invention, the fused silica has a particle size of 0.10 to 0.25 mm.
In the invention, the granularity of the metallic silicon, the boron carbide and the aluminum hydroxide is between 0.02 and 0.076 mm.
In the invention, the granularity of the urotropine is between 0.02 and 0.2 mm.
The method adopts shaped nearly spherical white corundum particles with narrow particle size range as a framework, and then adds urotropine and aluminum hydroxide fine powder as a framework gap filler, and then the materials are sintered at high temperature, so that the urotropine is completely decomposed and volatilized, and the aluminum hydroxide fine powder is decomposed to have a loss on ignition of more than 30%, and pores and gas channels are formed. The white corundum particles as the skeleton have nearly spherical shape and the same particle diameter, so that the size and distribution of the voids formed by the accumulation are relatively uniform, the distribution of the pores left when the urotropin is volatilized and the aluminum hydroxide fine powder is decomposed is uniform, and the porosity is high, so that the air permeability is good. The zirconium mullite improves the thermal stability of the zirconium mullite by utilizing the reasons of phase change toughening and microcrack toughening, and the fused quartz improves the thermal shock stability of the zirconium mullite by utilizing the low thermal conductivity coefficient and the thermal expansion coefficient of the fused quartz. The purposes of anti-corrosion and anti-scouring performance are achieved by the large-scale high-purity graphite and the high-purity raw materials. Because the porosity is high and the nearly spherical shape of the white corundum particles used as the framework has certain influence on the strength, the purpose of improving the strength can be achieved by adding the boron carbide and the silicon carbide without influencing the air permeability.
The tundish breathable water supply port is formed by molding the breathable lining material, the body material, the bowl material and the sliding surface material by an integrated isostatic pressing machine.
Wherein the body material, the bowl material and the slip surface material can be conventional materials in the field.
Preferably, the bulk material can be Al 2 O 3 -SiO 2 -C material, the chemical composition of which is: al (Al) 2 O 3 50-60wt.％，SiO 2 10-20wt.％，C 25-30wt.％。
Preferably, the bowl material can be Al according to different smelting steel types 2 O 3 -C material, mgO-C material or Al 2 O 3 -MgO-C material.
Wherein Al is 2 O 3 The chemical components of the material C are as follows: al (Al) 2 O 3 70-85wt.％，C 15-30wt.％。
The MgO-C material comprises the following chemical components: 70-80wt.% of MgO and 20-30wt.% of C.
Al 2 O 3 The chemical components of the-MgO-C material are as follows: al (Al) 2 O 3 50-60wt.％，MgO 25-35wt.％，C 15-20wt.％。
Preferably, the sliding surface material adopts Al 2 O 3 -C material, the chemical composition of which is: al (Al) 2 O 3 65-80wt.％，C 20-35wt.％。
Further preferably, the body material, the bowl material and the sliding surface material are produced according to the drawing size requirement.
In the invention, in the air-permeable upper nozzle of the tundish, the thickness of the air-permeable lining material is 10-15mm.
The preparation method of the tundish breathable upper nozzle comprises the following steps:
(1) A material preparation process: weighing raw materials according to a ratio;
(2) A kneading step: putting all the raw materials into a strong mixing granulator, and carrying out high-speed mixing to obtain pug;
(3) A mud material drying procedure: drying the pug in a roller at 60 +/-5 ℃ and controlling the volatile matter of the pug to be 0.95-1.15%;
(4) Ageing: putting the dried pug into a constant temperature chamber for ageing;
(5) A uniform mixing procedure: uniformly mixing the pug after ageing to obtain the breathable lining material;
(6) A molding procedure: forming the breathable lining material, the body material, the bowl material and the sliding surface material by adopting an integrated isostatic pressing machine, keeping the pressure at 115-130MPa for 3-7min, and obtaining a blank containing the breathable lining material;
(7) A heat treatment process: heat-treating the blank containing the air-permeable lining material at 220-280 ℃ for 6-8 h;
(8) A firing process: and (3) keeping the heat-treated blank containing the breathable lining material at 930-1000 ℃ for 4-6h, and sintering to obtain the tundish breathable water feeding port containing the breathable lining material.
In the mixing process, the high-speed mixing frequency is 35-40Hz, and the high-speed mixing time is not less than 15min.
In the ageing process, the ageing temperature is 25 +/-3 ℃, and the ageing time is not less than 24h. The ageing process aims to keep the temperature and the volatile content of the pug uniform, improve the forming performance of the pug and prevent cracks.
In the homogenizing mixing process, the homogenizing mixing frequency is 15-20Hz, and the homogenizing mixing time is not less than 5min. The uniform mixing is carried out in a uniform mixer, the purpose is to ensure the consistency of the volatile components of the pug, prevent the segregation of particles in the pug, cause the cracking during the forming and cause the steel penetrating accidents when in use in a steel mill.
Compared with the prior art, the invention has the following beneficial effects:
(1) The method adopts shaped nearly spherical white corundum particles with narrow particle size range as a framework, and then adds urotropine and aluminum hydroxide fine powder as a framework gap filler, and then the materials are sintered at high temperature, so that the urotropine is completely decomposed and volatilized, and the aluminum hydroxide fine powder is decomposed to have a loss on ignition of more than 30 percent, and pores and gas channels are formed;
(2) In the invention, the white corundum particles as the framework are nearly spherical and have the same particle diameter, the size and the distribution of gaps formed by accumulation are relatively uniform, the distribution of pores left when urotropine volatilizes and aluminum hydroxide fine powder is decomposed is uniform, and the porosity is high, so the air permeability is good;
(3) The added zirconium mullite improves the thermal stability of the zirconium mullite by utilizing the reasons of phase change toughening and microcrack toughening, the fused quartz improves the thermal shock stability of the fused quartz by utilizing the low thermal conductivity coefficient and the thermal expansion coefficient of the fused quartz, the purposes of erosion resistance and scouring resistance are achieved by large-scale high-purity graphite and high-purity raw materials, and the high porosity and the nearly spherical shape of white corundum particles serving as a framework inevitably have certain influence on the strength, so that the purpose of improving the strength can be achieved by adding boron carbide and silicon carbide without influencing the air permeability;
(4) The breathable lining material for the breathable upper nozzle of the tundish, which is prepared by the invention, has the advantages of high porosity, good breathability, good thermal shock stability, good erosion resistance and high strength; when molten steel is poured, the inclusion in the molten steel is promoted to float upwards by blowing argon and stirring the breathable lining material of the tundish nozzle, so that the impurity content of the steel billet can be effectively reduced, and the quality of the steel billet is improved.
Detailed Description
The present invention will be further described with reference to the following examples. The starting materials used in the examples are, unless otherwise specified, commercially available conventional starting materials; the processes used in the examples, unless otherwise specified, are conventional in the art.
Some of the raw materials used in the examples are illustrated below:
white corundum particles: shaped white corundum particles are adopted, the mass content of alumina is more than 98.5%, and the shaped white corundum particles consist of particles with the particle size of 24 meshes and particles with the particle size of 36 meshes;
white corundum fine powder: the content of the alumina is more than 98.5 percent, and the granularity is below 120 meshes;
large flake graphite: the carbon content is more than 98 percent, and the particle size is between 0.15 and 0.30 mm;
zirconium mullite: the granularity is between 0.02 and 0.2mm, and the chemical components are as follows: al (Al) 2 O 3 48.4wt.％，ZrO 2 36.3wt.％，SiO 2 15.3wt.％；
Fused silica: the granularity is between 0.10 and 0.25 mm;
metal silicon: the granularity is between 0.02 and 0.076 mm;
boron carbide: the granularity is between 0.02 and 0.076 mm;
aluminum hydroxide: the granularity is between 0.02 and 0.076 mm;
urotropin: the granularity is between 0.02 and 0.2 mm;
bulk material: by using Al 2 O 3 -SiO 2 -C material, chemical composition is: al (aluminum) 2 O 3 55wt.％，SiO 2 15wt.％，C 30wt.％；
Bowl material: by using Al 2 O 3 -C material, chemical composition is: al (Al) 2 O 3 80wt.％，C 20wt.％；
The material of the sliding surface: al (Al) 2 O 3 -C material, chemical composition is: al (Al) 2 O 3 75wt.％，C 25wt.％。
Example 1
A tundish breathable upper nozzle containing a breathable lining material is prepared by the following steps:
(1) A material preparation process: weighing the following raw materials and phenolic resin accounting for 12 percent of the total mass of the raw materials in percentage by mass: 20% of 24-mesh shaping white corundum particles, 30% of 36-mesh shaping white corundum particles, 10% of white corundum fine powder, 15% of large-scale graphite, 5% of zirconium mullite, 10% of fused quartz, 3% of metal silicon, 0.5% of boron carbide, 2% of urotropine and 4.5% of aluminum hydroxide;
(2) A kneading process: putting all the raw materials into a strong mixing granulator, and mulling for 15min at a high-speed mulling frequency of 35Hz to obtain pug;
(3) A mud material drying procedure: drying the pug in a roller at the drying temperature of 60 +/-5 ℃ and controlling the volatile content of the pug to be 1.15 percent;
(4) Ageing: putting the dried pug into a constant temperature room, and ageing the pug for 24 hours at the temperature of 25 +/-3 ℃;
(5) A uniform mixing procedure: uniformly mixing the pug after ageing for 5min at the mixing frequency of 15Hz to obtain the breathable lining material;
(6) A molding procedure: forming the breathable lining material, the body material, the bowl material and the sliding surface material by adopting an integrated isostatic pressing machine, wherein the thickness of the breathable lining material is 15mm, the pressure is 115MPa, and the pressure is maintained for 3min to obtain a blank containing the breathable lining material;
(7) A heat treatment process: heat-treating the blank containing the breathable lining material at 220 ℃ for 8 h;
(8) A firing process: and (3) keeping the temperature of the heat-treated blank containing the breathable lining material at 930 ℃ for 6h, and sintering to obtain the tundish breathable upper nozzle containing the breathable lining material.
Example 2
A tundish breathable upper nozzle containing a breathable lining material is prepared by the following steps:
(1) A material preparation process: weighing the following raw materials and phenolic resin accounting for 12 percent of the total mass of the raw materials in percentage by mass: 15% of 24-mesh shaping white corundum particles, 30% of 36-mesh shaping white corundum particles, 15% of white corundum fine powder, 15% of large-scale graphite, 15% of zircon mullite, 10% of fused quartz, 2% of metal silicon, 1% of boron carbide, 5% of urotropine and 2% of aluminum hydroxide;
(2) A kneading step: putting all the raw materials into a strong mixing granulator, and mulling for 15min at a high-speed mulling frequency of 40Hz to obtain pug;
(3) A mud material drying procedure: drying the pug in a roller at the drying temperature of 60 +/-5 ℃ and controlling the volatile content of the pug to be 1.15 percent;
(4) Ageing: putting the dried pug into a constant temperature room, and ageing the pug for 36 hours at the temperature of 25 +/-3 ℃;
(5) A uniform mixing procedure: uniformly mixing the pug after ageing for 5min at the mixing frequency of 20Hz to obtain the breathable lining material;
(6) A molding procedure: forming the breathable lining material, the body material, the bowl material and the sliding surface material by adopting an integrated isostatic pressing machine, wherein the thickness of the breathable lining material is 15mm, the pressure is 130MPa, and the pressure is maintained for 3min to obtain a blank containing the breathable lining material;
(7) A heat treatment process: heat-treating the blank containing the breathable lining material at 280 ℃ for 6h;
(8) A firing process: and (3) keeping the heat-treated blank containing the breathable lining material at 1000 ℃ for 4h, and sintering to obtain the tundish breathable upper nozzle containing the breathable lining material.
Example 3
A tundish breathable upper nozzle containing a breathable lining material is prepared by the following steps:
(1) A material preparation process: weighing the following raw materials and phenolic resin accounting for 12 percent of the total mass of the raw materials in percentage by mass: 20% of 24-mesh shaped white corundum particles, 25% of 36-mesh shaped white corundum particles, 15% of white corundum fine powder, 13% of large-flake graphite, 10% of zircon mullite, 8% of fused quartz, 2% of metal silicon, 0.5% of boron carbide, 3.5% of urotropine and 3% of aluminum hydroxide;
(2) A kneading step: putting all the raw materials into a strong mixing granulator, and mulling for 15min at a high-speed mulling frequency of 38Hz to obtain pug;
(3) A mud material drying procedure: drying the pug in a roller at the drying temperature of 60 +/-5 ℃ and controlling the volatile content of the pug to be 1.05 percent;
(4) Ageing: putting the dried pug into a constant temperature room, and ageing the pug for 36 hours at the temperature of 25 +/-3 ℃;
(5) A uniform mixing procedure: uniformly mixing the pug after ageing for 5min under the condition that the mixing frequency is 18Hz to obtain the breathable lining material;
(6) A molding procedure: forming the breathable lining material, the body material, the bowl material and the sliding surface material by adopting an integrated isostatic pressing machine, wherein the thickness of the breathable lining material is 15mm, the pressure is 120MPa, and the pressure is maintained for 3min to obtain a blank containing the breathable lining material;
(7) A heat treatment process: keeping the blank containing the breathable lining material at 240 ℃ for 6h for heat treatment;
(8) A firing process: and (3) keeping the heat-treated blank containing the breathable lining material at 950 ℃ for 6h, and sintering to obtain the tundish breathable upper nozzle containing the breathable lining material.
Example 4
A tundish breathable upper nozzle containing a breathable lining material is prepared by the following steps:
(1) A material preparation process: weighing the following raw materials and phenolic resin accounting for 12 percent of the total mass of the raw materials in percentage by mass: 15% of 24-mesh shaping white corundum particles, 25% of 36-mesh shaping white corundum particles, 15% of white corundum fine powder, 13% of large-scale graphite, 12% of zirconium mullite, 10% of fused quartz, 2.5% of metal silicon, 0.5% of boron carbide, 4% of urotropine and 3% of aluminum hydroxide;
(2) A kneading step: putting all the raw materials into a strong mixing granulator, and mulling for 15min at a high-speed mulling frequency of 35Hz to obtain pug;
(3) A mud material drying procedure: drying the pug in a roller at the drying temperature of 60 +/-5 ℃ and controlling the volatile matter of the pug to be 1.00 percent;
(4) Ageing: putting the dried pug into a constant temperature room, and ageing the pug for 24 hours at the temperature of 25 +/-3 ℃;
(5) A uniform mixing procedure: uniformly mixing the pug after ageing for 5min at the mixing frequency of 20Hz to obtain the breathable lining material;
(6) A molding procedure: forming the breathable lining material, the body material, the bowl material and the sliding surface material by adopting an integrated isostatic pressing machine, wherein the thickness of the breathable lining material is 10mm, the pressure is 125MPa, and the pressure is maintained for 3min to obtain a blank containing the breathable lining material;
(7) A heat treatment process: heat-treating the blank containing the breathable lining material at 260 ℃ for 6h;
(8) A firing process: and (3) keeping the heat-treated blank containing the breathable lining material at 980 ℃ for 6h, and sintering to obtain the tundish breathable upper nozzle containing the breathable lining material.
Comparative example 1
This comparative example differs from example 1 only in that aluminum hydroxide and urotropin were replaced with white corundum fine powder of equal mass in step (1).
Comparative example 2
The comparative example differs from example 1 only in that in step (1), the 24-mesh plastic white corundum particles were replaced with 24-mesh common white corundum particles of equal mass, and the 36-mesh plastic white corundum particles were replaced with 36-mesh common white corundum particles of equal mass.
Comparative example 3
This comparative example is different from example 1 only in that urotropin was replaced with white corundum fine powder of equal mass in step (1).
Each example and comparative example were tested for performance, wherein air permeability was measured by air permeability, and tested with reference to standard YB/T4115-2017; the strength is measured by the flexural strength and the compressive strength, and is respectively tested according to the standards GB/T3001-2017 and GB/T5072-2008; testing the thermal shock stability according to the standard YB/T376.3-2010; the erosion resistance is measured by the percentage of the area eroded in the slag resistance test and is tested with reference to the standard GB/T8931-2007. The test results are shown in table 1.
TABLE 1 test results
As can be seen from the test results in Table 1, the performance test results of the examples and the comparative examples are not much different in terms of strength and erosion resistance, and both meet the requirements of functional refractory materials.
In the apparent porosity, the apparent porosity of the examples was high, while the apparent porosity of the comparative examples was low, because the ignition loss of aluminum hydroxide as a filler in the examples was as high as 30%, urotropin was almost completely volatilized to leave pores, form gas channels, and further white corundum particles as a skeleton were shaped into a nearly spherical shape, and easily formed through gas channels. Although comparative example 2 also contained aluminum hydroxide and urotropin, since the ordinary white corundum particles were used, the edges and corners of the particles were large, the number of closed pores formed was large, and the number of through pores was small, so that the ventilation amount did not reach the requirement of not less than 7L/min.
In the aspect of thermal shock stability, in the embodiment, because the porosity is higher, a compact body is not formed, thermal stress impact can be effectively relieved, and the thermal shock stability of the comparative example 2 is also better and is related to the fact that the compact body is not formed.
In terms of erosion resistance, comparative example 1 is the most erosion resistant, which is the lowest porosity and less chance of slag penetration into pores, but considering that inert gas under a certain pressure forms a gas curtain at the steel contact part of the gas permeable lining material in actual use, thereby stopping the penetration erosion of molten steel and slag.
In conclusion, compared with the existing non-carbon-containing breathable lining material, the breathable lining material prepared in the embodiment of the invention has better thermal shock stability and does not have steel burst and penetration accidents, and the embodiment contains graphite which is not wet with steel slag, so that the anti-erosion property is better, compared with the existing carbon-containing breathable lining material, the ventilation capacity is higher, the ventilation capacity of the existing breathable tundish nozzle is generally lower than 5L/min, and the ventilation capacity of the existing breathable tundish nozzle is more than 8L/min.
Claims (10)
1. The utility model provides a ventilative mouth of a river and used ventilative lining material on middle package which characterized in that: the phenolic resin comprises the following raw materials in percentage by mass and phenolic resin accounting for 8-12% of the total mass of the raw materials:
2. a tundish porous nozzle assembly as claimed in claim 1, wherein the porous lining material comprises: the white corundum particles are shaped white corundum particles, the mass content of alumina is more than 98.5%, the white corundum particles consist of particles with the granularity of 24 meshes and particles with the granularity of 36 meshes, and the mass ratio of the white corundum particles to the alumina is 1 (1-2).
3. A tundish porous nozzle assembly as claimed in claim 1, wherein the porous lining material comprises: the mass content of alumina in the white corundum fine powder is more than 98.5 percent, and the granularity is below 120 meshes.
4. A tundish porous nozzle assembly as claimed in claim 1, wherein the porous lining material comprises: the mass content of carbon in the large flake graphite is more than 98%, and the granularity is between 0.15 and 0.30 mm.
5. A tundish porous nozzle assembly as claimed in claim 1, wherein the porous lining material comprises: the granularity of the zirconium mullite is between 0.02 and 0.2 mm; the chemical components of the zirconium mullite are as follows: al (Al) 2 O 3 45-50wt.％，ZrO 2 35-40wt.％，SiO 2 15-20wt.％。
6. A tundish porous nozzle assembly as claimed in claim 1, wherein the porous lining material comprises: the particle size of the fused quartz is between 0.10 and 0.25 mm; the granularity of the metallic silicon, the boron carbide and the aluminum hydroxide is between 0.02 and 0.076 mm; the particle size of the urotropine is between 0.02 and 0.2 mm.
7. A tundish air permeable nozzle using the air permeable lining material of any one of claims 1 to 6, wherein: the bowl-shaped body is formed by integrally molding a breathable lining material, a body material, a bowl material and a sliding surface material by an isostatic pressing machine.
8. A tundish porous nozzle according to claim 7, wherein: the thickness of the breathable lining material is 10-15mm.
9. A method for preparing a tundish breathable upper nozzle according to claim 7, wherein the method comprises the following steps: the method comprises the following steps:
(1) A material preparation process: weighing raw materials according to a ratio;
(2) A kneading process: putting all the raw materials into a strong mixing granulator, and carrying out high-speed mixing to obtain pug;
(3) A mud material drying procedure: drying the pug in a roller at 60 +/-5 ℃ and controlling the volatile matter of the pug to be 0.95-1.15%;
(4) Ageing: putting the dried pug into a constant temperature chamber for ageing;
(5) A uniform mixing procedure: uniformly mixing the pug after ageing to obtain the breathable lining material;
(6) A molding procedure: forming the breathable lining material, the body material, the bowl material and the sliding surface material by adopting an integrated isostatic pressing machine, keeping the pressure at 115-130MPa for 3-7min, and obtaining a blank containing the breathable lining material;
(7) A heat treatment process: heat-treating the blank containing the air-permeable lining material at 220-280 ℃ for 6-8 h;
(8) A firing process: and (3) keeping the heat-treated blank containing the breathable lining material at 930-1000 ℃ for 4-6h, and sintering to obtain the tundish breathable water feeding port containing the breathable lining material.
10. The method for preparing the air-permeable upper nozzle of the tundish according to claim 9, wherein: in the kneading process, the high-speed kneading frequency is 35-40Hz; in the homogenizing step, the kneading frequency is 15-20Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211612554.8A CN115819096A (en) | 2022-12-09 | 2022-12-09 | Tundish breathable upper nozzle, breathable lining material used for tundish breathable upper nozzle and preparation method of breathable lining material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211612554.8A CN115819096A (en) | 2022-12-09 | 2022-12-09 | Tundish breathable upper nozzle, breathable lining material used for tundish breathable upper nozzle and preparation method of breathable lining material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115819096A true CN115819096A (en) | 2023-03-21 |
Family
ID=85547478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211612554.8A Pending CN115819096A (en) | 2022-12-09 | 2022-12-09 | Tundish breathable upper nozzle, breathable lining material used for tundish breathable upper nozzle and preparation method of breathable lining material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115819096A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0288476A (en) * | 1988-09-21 | 1990-03-28 | Kurosaki Refract Co Ltd | Air-permeable refractory |
| CN201333524Y (en) * | 2009-01-19 | 2009-10-28 | 马鞍山市益江高温陶瓷制造有限公司 | One-step forming air permeable and blockage-prevention tundish upper nozzle |
| CN103896611A (en) * | 2014-03-14 | 2014-07-02 | 濮阳濮耐高温材料（集团）股份有限公司 | Air brick with high blowing through rate and manufacturing method thereof |
| CN107879732A (en) * | 2017-11-27 | 2018-04-06 | 武汉科技大学 | A kind of diffusion-type breathable refractory materials and preparation method thereof |
| CN108329017A (en) * | 2018-03-19 | 2018-07-27 | 营口市瑞福来耐火材料有限公司 | Isometrical magnesia material of spherical shape and preparation method thereof and the application in producing the magnesia porous plug of disperse formula |
| CN112794704A (en) * | 2021-01-08 | 2021-05-14 | 武汉科技大学 | SiC whisker reinforced corundum breathable refractory material and preparation method thereof |
-
2022
- 2022-12-09 CN CN202211612554.8A patent/CN115819096A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0288476A (en) * | 1988-09-21 | 1990-03-28 | Kurosaki Refract Co Ltd | Air-permeable refractory |
| CN201333524Y (en) * | 2009-01-19 | 2009-10-28 | 马鞍山市益江高温陶瓷制造有限公司 | One-step forming air permeable and blockage-prevention tundish upper nozzle |
| CN103896611A (en) * | 2014-03-14 | 2014-07-02 | 濮阳濮耐高温材料（集团）股份有限公司 | Air brick with high blowing through rate and manufacturing method thereof |
| CN107879732A (en) * | 2017-11-27 | 2018-04-06 | 武汉科技大学 | A kind of diffusion-type breathable refractory materials and preparation method thereof |
| CN108329017A (en) * | 2018-03-19 | 2018-07-27 | 营口市瑞福来耐火材料有限公司 | Isometrical magnesia material of spherical shape and preparation method thereof and the application in producing the magnesia porous plug of disperse formula |
| CN112794704A (en) * | 2021-01-08 | 2021-05-14 | 武汉科技大学 | SiC whisker reinforced corundum breathable refractory material and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 中国冶金百科全书总编辑委员会《耐火材料》卷编辑委员会等编: "《中国冶金百科全书 耐火材料》", vol. 1, 冶金工业出版社, pages: 170 - 171 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105170968B (en) | A kind of submersed nozzle | |
| CN109579525B (en) | System for preparing high-purity high manganese steel | |
| CN107382357A (en) | A kind of ladle bottom blowing composite air bricks disperse material and preparation method thereof | |
| CN109487037B (en) | High-purity manganese 13 high-manganese steel | |
| CN104841920A (en) | Composite long-life low-cost steel ladle air brick base brick and manufacturing method thereof | |
| CN111574208B (en) | Preparation method of corundum-zirconium mullite air brick with high thermal shock resistance | |
| Gehre et al. | Interaction of slip‐and flame‐spray coated carbon‐bonded alumina filters with steel melts | |
| JP4234789B2 (en) | Nozzle for pouring molten metal and its manufacturing method | |
| CN108424124B (en) | Spinel reinforced magnesium oxide base crucible synthesized in situ by magnesium oxide whisker and preparation method thereof | |
| CN109487036B (en) | High-purity manganese 18 high-manganese steel and preparation method thereof | |
| WO2021197002A1 (en) | Anti-nodulation tundish gas-permeable upper nozzle | |
| CN108588438B (en) | Metal smelting method and smelting furnace | |
| CN111732417B (en) | Scouring-resistant ultra-low-carbon magnesia-carbon brick with excellent oxidation resistance and preparation method thereof | |
| CN115819096A (en) | Tundish breathable upper nozzle, breathable lining material used for tundish breathable upper nozzle and preparation method of breathable lining material | |
| CN204842949U (en) | Combined type high life, low -cost ladle air brick brick cup and brick cup mould | |
| CN111390149A (en) | Casting ladle for casting aluminum alloy | |
| CN111470854B (en) | Composite tundish slag absorption filter and production method thereof | |
| CN112110716B (en) | Production process of refractory material and refractory material prepared by production process | |
| CN109504821B (en) | Method for reducing oxygen and hydrogen contents of high manganese steel | |
| CN111113634A (en) | Combined plate blank continuous casting tundish turbulence controller and preparation method thereof | |
| CN102896309B (en) | Monolithic stopper used for continuous casting, and preparation method thereof | |
| CN113999008B (en) | Low-carbon submersed nozzle lining and preparation method thereof | |
| CN105665692B (en) | A kind of long nozzle anti-thermal shock liner complex and its preparation process | |
| KR101370369B1 (en) | The sliding nozzle opening filler of ladle | |
| JP4960574B2 (en) | Refractory used for continuous casting nozzles to prevent alumina adhesion |
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 |