CN116967438A - Continuous casting steel ladle anti-bursting long nozzle and preparation method thereof - Google Patents
Continuous casting steel ladle anti-bursting long nozzle and preparation method thereof Download PDFInfo
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- CN116967438A CN116967438A CN202311088592.2A CN202311088592A CN116967438A CN 116967438 A CN116967438 A CN 116967438A CN 202311088592 A CN202311088592 A CN 202311088592A CN 116967438 A CN116967438 A CN 116967438A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 39
- 239000010959 steel Substances 0.000 title claims abstract description 39
- 238000009749 continuous casting Methods 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title description 12
- 239000000463 material Substances 0.000 claims abstract description 148
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 121
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 claims abstract description 86
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000005011 phenolic resin Substances 0.000 claims abstract description 67
- 229920001568 phenolic resin Polymers 0.000 claims abstract description 67
- 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 65
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 65
- 229910052751 metal Inorganic materials 0.000 claims abstract description 64
- 239000002184 metal Substances 0.000 claims abstract description 64
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 54
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000010439 graphite Substances 0.000 claims abstract description 46
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 46
- 239000011863 silicon-based powder Substances 0.000 claims abstract description 43
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 34
- 239000010431 corundum Substances 0.000 claims abstract description 34
- RQMIWLMVTCKXAQ-UHFFFAOYSA-N [AlH3].[C] Chemical compound [AlH3].[C] RQMIWLMVTCKXAQ-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000002893 slag Substances 0.000 claims abstract description 25
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 8
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims abstract description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 112
- 239000000843 powder Substances 0.000 claims description 107
- 230000007704 transition Effects 0.000 claims description 63
- 239000002245 particle Substances 0.000 claims description 52
- 238000002156 mixing Methods 0.000 claims description 41
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 32
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- 239000000919 ceramic Substances 0.000 claims description 26
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- 238000001035 drying Methods 0.000 claims description 23
- 239000002002 slurry Substances 0.000 claims description 23
- 229910052580 B4C Inorganic materials 0.000 claims description 22
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 22
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 20
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- 238000001238 wet grinding Methods 0.000 claims description 13
- 229910021418 black silicon Inorganic materials 0.000 claims description 12
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- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 10
- 239000000440 bentonite Substances 0.000 claims description 10
- 229910000278 bentonite Inorganic materials 0.000 claims description 10
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 10
- 229910052796 boron Inorganic materials 0.000 claims description 10
- 229920001971 elastomer Polymers 0.000 claims description 10
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- 238000000227 grinding Methods 0.000 claims description 10
- 229910052573 porcelain Inorganic materials 0.000 claims description 10
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 10
- 229910002076 stabilized zirconia Inorganic materials 0.000 claims description 10
- 239000008399 tap water Substances 0.000 claims description 10
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- MUBZPKHOEPUJKR-UHFFFAOYSA-N oxalic acid group Chemical group C(C(=O)O)(=O)O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 9
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 7
- 238000005261 decarburization Methods 0.000 description 7
- 239000011819 refractory material Substances 0.000 description 7
- 230000035939 shock Effects 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
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- 238000005266 casting Methods 0.000 description 5
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- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
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- 239000005350 fused silica glass Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- -1 magnesium aluminate Chemical class 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 229910052596 spinel Inorganic materials 0.000 description 2
- 239000011029 spinel Substances 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
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- 230000008646 thermal stress Effects 0.000 description 2
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- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
- B22D41/54—Manufacturing or repairing thereof characterised by the materials used therefor
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a continuous casting steel ladle anti-bursting long nozzle, which comprises a long nozzle body, wherein a slag line segment integrated with the long nozzle body is arranged above the long nozzle body, aluminum carbon linings are arranged on the slag line segment and the inner side of the long nozzle body, and a layer of glaze is coated on the outer side of the long nozzle body; the long nozzle body material comprises the following components in parts by weight: 18-26 parts of low-aluminum mullite, 20-25 parts of fused white corundum, 18-25 parts of crystalline flake graphite, 23-26 parts of brown corundum, 1-3 parts of calcined alpha-corundum micropowder, 1-2.5 parts of metal silicon powder, 0.5-2 parts of metal aluminum powder, 8-11 parts of phenolic resin, 5-6 parts of furfural and 1-2 parts of ethylene glycol.
Description
Technical Field
The invention belongs to the technical field of refractory functional materials for continuous casting, and particularly relates to a continuous casting steel ladle anti-bursting long nozzle and a preparation method thereof.
Background
The ladle long nozzle (or called a protecting pipe) is a circular pipe-shaped channel for injecting molten steel from a ladle into a tundish, and plays roles of guiding flow and preventing molten steel from oxidizing and splashing. The manipulator is propped against the tapping hole of the ladle drain port, so that the secondary oxidation caused by the fact that molten steel is not exposed after the molten steel exits the ladle is prevented, and the effect of preventing splashing of steel flows is achieved. The long nozzle has strong adaptability to steel types and good erosion resistance, is an important functional refractory material for realizing molten steel protection casting to improve the quality of billets, and directly influences whether the whole continuous casting process can be normally performed or not.
When the long nozzle is used for the first time, the inner wall is directly contacted with high-temperature molten steel with the temperature of 1550 ℃, the inner wall is heated rapidly within 2-3 seconds, the temperature of the outer wall is still close to the room temperature, a temperature gradient is generated in the material, the inner wall and the outer wall material cannot expand synchronously, compressive stress is generated on the inner wall, and the outer wall is subjected to larger tensile stress. The aluminum-carbon material belongs to brittle materials, and the tensile strength is much lower than the compressive strength. When the tensile stress in the outer wall of the long nozzle exceeds the ultimate tensile strength of the refractory material, the outer wall of the long nozzle can generate the phenomena of longitudinal cracks, neck transverse cracks and the like.
Therefore, the long nozzle must be preheated to above 1000 ℃ before use, which not only consumes energy and deteriorates the operating environment, but also causes complicated and time-consuming replacement operation. The development of a bursting-resistant long nozzle is the key to solve the problem, and the manufacture of the bursting-resistant long nozzle can be realized by 2 ways: firstly, graphite with high heat conductivity and fused quartz with low thermal expansion rate are added, but the erosion resistance and the scouring resistance of the fused quartz are reduced; and a layer of heat insulation layer with low heat conductivity coefficient is compounded in the inner hole of the nozzle, so that the nozzle is also a main development trend of the anti-cracking long nozzle.
In the steel casting process, the slag resistance of the carbon composite material is obviously improved due to the non-wettability of graphite to molten steel and slag. However, graphite is easily oxidized, and aluminum carbon materials can undergo oxidative decarburization during manufacture and use. On the other hand, when graphite contacts molten steel, it is not likely to wet the molten steel, but the [ C ] in the molten steel does not reach saturation, and graphite can be dissolved into the molten steel. The long nozzle needs high carbon content to ensure thermal shock property, and graphite contacting the rear surface of molten steel is quickly dissolved into the molten steel, so that decarburization is generated, and a loose and porous decarburization layer is formed on the surface. The decarburized layer only retains the oxide, loses the original bonding strength, is not easy to dissolve into molten steel, but is easily wetted by molten steel and slag to cause corrosion. The molten steel washes the oxide on the inner surface of the long nozzle at a high speed, so that the inner layer is fallen off, and then graphite is contacted with the molten steel. The process is alternately carried out, and the inner hole of the long nozzle is enlarged. On the liquid surface of the slag line, the liquid surface fluctuates, and after graphite is dissolved into molten steel, oxides are corroded and damaged by slag, and the process is alternately performed, so that a long water gap is damaged.
Along with the continuous casting process, the internal and external temperatures of the long nozzle gradually tend to be stable, the thermal stress gradually decreases, and the long nozzle is gradually influenced by mechanical stress and self gravity generated by molten steel flushing. Because the aluminum-carbon long nozzle adopts organic binder such as resin, the carbon chain formed by curing the organic binder is destroyed, and the material cannot form good ceramic bonding, so that the bonding strength of the whole material is reduced, the material is easy to be flushed by high-speed steel flow, and the mechanical flushing is more serious when the flow speed of molten steel is higher. And meanwhile, carbon falls off due to high-speed flushing of molten steel, impact decarburization is generated, and decarburization damage of a long nozzle is increased.
It can be seen from the above that: in the early stage of steel casting, the main factor of damage of a long nozzle is thermal shock damage, and then the long nozzle is changed into decarburization and mechanical flushing damage after the temperature is stable. The decarburization and mechanical erosion damage are determined by the properties of the aluminum-carbon material and the service environment, so that the change is difficult; however, the thermal shock damage occurs in the initial stage of casting steel, which is the first step for determining the reliability of the long nozzle, and if the longitudinal and transverse cracks occur to a greater extent at this time, serious safety accidents may be caused. Therefore, how to relieve the thermal stress in the initial stage of casting steel becomes an important research direction for prolonging the service life and reliability of a long nozzle.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a continuous casting steel ladle anti-bursting long nozzle and a preparation method thereof.
In order to achieve the above purpose, the invention is realized by the following technical scheme: the continuous casting steel ladle anti-bursting long nozzle comprises a long nozzle body and slag line segments integrated with the long nozzle body, wherein aluminum carbon linings are arranged on the inner side of the whole long nozzle body, and meanwhile, a layer of glaze is coated on the outer side of the long nozzle body;
the long nozzle body material comprises the following components in parts by weight: 18-26 parts of low-aluminum mullite, 20-25 parts of fused white corundum, 18-25 parts of crystalline flake graphite, 23-26 parts of brown corundum, 1-3 parts of calcined alpha-corundum micropowder, 1-2.5 parts of metal silicon powder, 0.5-2 parts of metal aluminum powder, 8-11 parts of phenolic resin, 5-6 parts of furfural and 1-2 parts of ethylene glycol;
the slag line comprises the following components in parts by weight: 38-42 parts of stabilized zirconia particles, 22-26 parts of stabilized zirconia fine powder, 5-10 parts of crystalline flake graphite, 3-5 parts of calcined alpha-active alumina micro powder, 1-2.5 parts of metal silicon powder, 0.5-2 parts of metal aluminum powder, 4-6 parts of boron carbide, 8-11 parts of phenolic resin, 5-6 parts of furfural and 1-2 parts of ethylene glycol.
The invention further defines the technical scheme that:
Preferably, the aluminum carbon lining comprises the following components in parts by mass: 42-45 parts of alumina hollow sphere particles, 18-26 parts of low-alumina mullite, 3-10 parts of crystalline flake graphite, 10-15 parts of calcined alpha-active alumina micro powder, 3-6 parts of metal silicon powder, 8-15 parts of phenolic resin and 2-3 parts of polyvinyl alcohol.
Preferably, a layer of glaze is sprayed on the whole surface of the long nozzle, and the glaze comprises the following components in parts by mass: 22-26 parts of low-alumina mullite fine powder slurry, 10-12 parts of boron glass powder, 12-15 parts of black silicon carbide, 8-10 parts of boron carbide, 3-5 parts of bentonite, 1-3 parts of calcined a-active alumina micro powder, 3-5 parts of metal silicon powder, 2-6 parts of silica sol and 30-32 parts of water.
Preferably, the low-alumina mullite or the low-alumina mullite fine powder slurry is prepared by adopting waste high-voltage ceramic reclaimed materials and performing sorting classification, crushing, screening and deironing;
wherein sorting and grading are mainly based on alumina content, al 2 O 3 Waste high-voltage ceramic blocks with the content of 48-56% are coarsely broken and screened, and a high-strength magnetic separator is arranged at the blanking part of each grain grade discharge hole in a breaking and screening system for removing iron;
the waste high-voltage porcelain with the rough breaking less than or equal to 2mm is weighed and poured into a ceramic ball mill, 30-33 wt% of clean tap water is added according to the weight, and then wet milling is carried out for 24-36 hours, so as to obtain low-alumina mullite fine powder slurry in glaze;
Coarse crushing particles with the particle size of 2-8 mm, fine crushing, screening, acid liquor soaking and vibration grinding, classifying raw material particles and fine powder according to the particle size after final grinding, and the raw material particles and the fine powder comprise the following components in parts by weight: 0.5-1mm of granule material, 0.074-0.5 mm, less than or equal to 0.074mm of powder material, which is used as raw materials of a long nozzle body and an aluminum carbon lining;
coarse grain return materials with the grain diameter of more than 8mm are broken again.
Preferably, the acid liquor is specifically an organic acid with 2-5wt% of acid liquor, the soaking time is 3-5 days, the granules are dried in shade for 24-48 hours after being soaked, and then the granules are dried at 140-150 ℃.
The invention provides a preparation method of a continuous casting steel ladle anti-bursting long nozzle, which is characterized by comprising the following steps of: the method comprises the following steps:
and (one) preparing a long nozzle body:
(1) Weighing 18-26 parts of low-alumina mullite, 20-25 parts of electro-fused white corundum, 18-25 parts of crystalline flake graphite, 23-26 parts of brown corundum and 1-3 parts of calcined alpha-active alumina micropowder according to the parts, and pouring the materials into a transition hopper; 1 to 2.5 parts of metal silicon powder and 0.5 to 2 parts of metal aluminum powder are premixed for 20 to 30 minutes by a premixing machine, poured into a transition hopper, covered with moisture-proof cloth, and pushed into a constant temperature and humidity warehouse at 24 ℃ for 24 to 36 hours together with 8 to 11 parts of phenolic resin, 5 to 6 parts of furfural and 1 to 2 parts of ethylene glycol;
(2) Taking out a transition hopper and corresponding phenolic resin, furfural and ethylene glycol from a constant temperature and humidity warehouse, firstly injecting materials in the transition hopper into a vacuum granulator through a feeding pipe, pre-mixing at a low speed for 3-5 min, injecting wet materials of the furfural and the ethylene glycol when the material temperature is not lower than 35 ℃, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, carrying out wet mixing for 5-6 min, vacuumizing the granulator to 20Pa or lower when the material cavity temperature is 40 ℃, starting high-speed granulation, controlling the total granulation time to be 30-32 min or the material cavity temperature of the granulator to 55 ℃, opening a discharge valve to discharge when the material temperature is consistent with the material temperature, and drying the granular materials by adopting a rotary dryer or a drying disc;
and (II) preparing a slag line section:
(1) Weighing 38-42 parts of stable zirconia particles, 22-26 parts of stable zirconia fine powder, 5-10 parts of crystalline flake graphite, 3-5 parts of calcined alpha-active alumina micro powder and 4-6 parts of boron carbide, pouring into a transition hopper, premixing 1-2.5 parts of metal silicon powder and 0.5-2 parts of metal aluminum powder for 20-30 min by a premixing machine, pouring into the transition hopper, covering damp-proof cloth, and pushing into a 24 ℃ constant temperature and humidity warehouse together with 8-11 parts of phenolic resin, 5-6 parts of furfural and 1-2 parts of ethylene glycol for storage for 24-36 hours;
(2) Taking out a transition hopper, corresponding phenolic resin, furfural and ethylene glycol from a constant temperature and humidity warehouse, injecting a material feeding pipe in the transition hopper into a vacuum granulator, and premixing for 3-5 min at a low speed, wherein the material temperature is not lower than 30 ℃; injecting wet materials of furfural and ethylene glycol, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, wet mixing for 5-6 min, vacuumizing a granulator to below 20Pa when the temperature of a material cavity is 40 ℃, starting high-speed granulation, enabling the total granulation time to be not less than 30min or enabling a discharge valve to discharge when the total granulation time is not less than 30min or the temperature of the material cavity of the granulator is 50 ℃, and drying the granules by adopting a rotary dryer or a drying disc;
(III) preparation of an aluminum carbon lining:
(1) Weighing 42-45 parts of alumina hollow sphere particles, 18-26 parts of low-alumina mullite, 3-10 parts of crystalline flake graphite and 10-15 parts of calcined alpha-active alumina micropowder, pouring into a transition hopper, premixing 3-6 parts of metal silicon powder for 10-15min by a premixing machine, pouring into the transition hopper, covering a dampproof cloth, and pushing the mixture with 8-15 parts of phenolic resin and 2-3 parts of polyvinyl alcohol into a 24 ℃ constant temperature and humidity warehouse for storage for 24-36 hours;
(2) Taking out the transition hopper, the corresponding phenolic resin and the polyvinyl alcohol from the constant temperature and humidity warehouse, firstly injecting a material feeding pipe in the transition hopper into a vacuum granulator, and premixing for 3-5 min at a low speed, wherein the material temperature is not lower than 30 ℃; injecting polyvinyl alcohol, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, wet mixing for 5-6 min, vacuumizing a granulator to below 20Pa when the temperature of a material cavity is 40 ℃, starting high-speed granulation, starting a discharge valve to discharge when the total granulation time is not less than 30min or the temperature of the material cavity of the granulator is 55 ℃, and adopting a rotary dryer or a drying disc to dry the granules;
(IV) charging and press forming: according to the technological requirements, installing a core rod and a rubber sleeve, respectively filling an aluminum-carbon inner lining material, a long nozzle body material and a slag line section material, vibrating and compacting, covering a rubber cover, performing waterproof treatment, and then sending into an isostatic pressing machine for pressing and forming, wherein the maximum forming pressure is 120MPa.
And (V) heat treatment: and (3) feeding the long nozzle blank subjected to compression molding into a furnace for heat treatment, wherein the highest temperature is 180-250 ℃ and the time is 8 hours.
And (six) machining: cutting and turning according to the requirements of the drawing of the product;
and (seventh) glaze spraying: waste high-voltage ceramic materials with the coarse-broken grain diameter less than or equal to 2mm are weighed and poured into a ceramic ball mill, clean tap water is added, and wet milling is carried out for 24-36 hours to prepare slurry for later use, so as to obtain low-aluminum mullite fine powder slurry;
weighing 22-26 parts of low-alumina mullite fine powder slurry, 10-12 parts of boron glass powder, 12-15 parts of black silicon carbide, 8-10 parts of boron carbide, 3-5 parts of bentonite, 1-3 parts of calcined a-active alumina micro powder, 3-5 parts of metal silicon powder, 2-6 parts of silica sol, 30-32 parts of water, and injecting into a ceramic ball mill, and jointly performing wet milling for 30-60 min to obtain a long water gap glaze;
sending the heat-treated and machined anti-cracking long water gap into a heating furnace, preheating to 60-70 ℃, preserving heat for 10-15 min, taking out, spraying the prepared glaze on the surface of the long water gap through a spray gun, and controlling the thickness of the glaze to be 0.4-0.5 mm;
(eighth) firing: and (3) delivering the semi-finished product subjected to glaze spraying into a high-temperature kiln for firing, wherein the highest temperature of the firing is 900-1000 ℃, and preserving heat for 6-8h.
And (nine) installing accessories such as iron shells, argon blowing nozzles and the like, and detecting and boxing to obtain the long nozzle product.
The fused white corundum is a commercial fused white corundum refractory raw material and is characterized in that the granularity is 1-0.5 mm, and the Al 2 O 3 ≥99.3％，SiO 2 ≤0.1％，Fe 2 O 3 ≤0.08％。
The flake graphite adopts natural flake graphite with granularity less than 0.15mm and carbon content more than or equal to 96 wt%.
The granularity of the metal silicon powder is less than 0.074mm; siO (SiO) 2 The content is more than or equal to 98 weight percent, and the Fe2O3 is less than 1.2 weight percent.
Brown corundum Al as described above 2 O 3 The content is more than or equal to 95 weight percent, siO 2 ≤0.7wt％，Fe 2 O 3 Less than or equal to 0.8 weight percent, adopting three different granularities to mix, wherein the granularity is respectively 1-0.5 mm, 0.5-0.074 mm and less than 0.074mm; .
Calcining a-Al as described above 2 O 3 The micro powder adopts calcined active a-corundum micro powder, and the particle diameter D of the calcined active a-corundum micro powder 50 Less than 2 μm, primary grain size less than 1.5 μm; al (Al) 2 O 3 The content is more than or equal to 99.5wt percent, and the true specific gravity is more than or equal to 3.92g/cm 3 。
The phenolic resin is thermoplastic phenolic resin, the fluidity of the phenolic resin is 20-40 mm, the residual carbon content is more than or equal to 45%, and free phenol: 2.0 to 4.0 percent, and-140 meshes of more than or equal to 95 percent of yellow-white powdery refractory material binding agent.
The purity of the furfural is more than or equal to 98.5 percent, and the density is more than or equal to 1.15g/cm 3 ；
The purity of the glycol is more than or equal to 98.5 percent, and the density is more than or equal to 1.10g/cm 3 ；
Al of the above magnesium aluminate spinel 2 O 3 The content is more than or equal to 68wt percent, the MgO is more than or equal to 22wt percent, and Fe 2 O 3 Less than or equal to 0.6wt percent; the granularity is respectively as follows: 1 to 0.5mm,0.5 to 0.12mm, less than 0.074mm;
the stable zirconia adopts calcium oxide or yttrium oxide as a stabilizer, and fully reacts in a furnace at a temperature higher than 1650 ℃ for more than 5 hours to form stable cubic zirconia, wherein ZrO 2 More than or equal to 95 weight percent, and the stabilization rate is more than or equal to 85 percent; the granularity is respectively as follows: 0.25-0.15 mm, 0.15-0.1 mm less than 0.044mm;
the boron carbide B 4 The content of C is more than or equal to 88 weight percent, and the granularity is less than or equal to 0.044mm.
The black silicon carbide SiC is more than or equal to 95 weight percent, and the granularity is less than or equal to 0.044mm.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
when the waste high-voltage electric porcelain is initially broken, the vast majority of low-melting matters, impurities and surface glaze materials in the waste electric porcelain are presented in the form of fine particles and powder, and fine particles with the particle size of less than 2mm are removed through screening, so that the low-aluminum mullite raw material with higher purity is obtained; the low-alumina mullite is used as one of mullite, and is prepared through homogenizing, compounding, fine grinding and sintering at 1500 deg.c and over to fuse cristobalite phase and form high silica glass after cooling, and has relatively low heat expansion coefficient and high heat shock resistance. The physical and chemical indexes are as follows: the alumina content is 42-56%, the silica content is 28-40%, it is a high-quality refractory material, it has little expansion and every direction is even, thermal shock stability is very good, load softening point is high, high temperature creep value is small, hardness is large, resist characteristics such as being good of chemical corrosion resistance, mullite crystal grain in the low alumina mullite is irregularly arranged and netted interweaved structure, the refractory material product made of adding the raw material of low alumina mullite has very good thermal shock stability; the method recycles the low-aluminum mullite obtained after the treatment of the waste high-voltage electric porcelain, and prepares the continuous casting long nozzle blank material by taking the reclaimed material of the waste high-voltage electric porcelain as a raw material.
In addition, the fine particles with the particle diameter of less than 2mm are removed, the main component is the glaze raw material with good long water gap, and the part containing impurities such as iron, potassium, sodium and the like is the glaze raw material with good long water gap. The waste high-voltage electric porcelain material is used in all sections of materials of the anti-explosion long nozzle, has the characteristics of low production cost, no change of the original production process and energy conservation, and the continuous casting long nozzle refractory material has high strength, good thermal shock stability, no baking and no cracking during use.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
Referring to fig. 1, a continuous casting steel ladle anti-bursting long nozzle comprises a long nozzle body 1 and a slag line section 2 integrated with the long nozzle body, wherein aluminum carbon lining 3 is arranged on the inner side of the slag line section and the inner side of the long nozzle body, and a layer of glaze 4 is coated on the outer side of the long nozzle body;
The long nozzle body comprises the following components in parts by mass: 22 parts of low-alumina mullite, 20 parts of fused white corundum, 18 parts of crystalline flake graphite, 23 parts of brown corundum, 1 part of calcined a-corundum micropowder, 1 part of metal silicon powder, 1 part of metal aluminum powder, 8 parts of phenolic resin, 5 parts of furfural and 1 part of ethylene glycol;
the slag line section comprises the following components in parts by mass: 40 parts of stabilized zirconia particles, 25 parts of stabilized zirconia fine powder, 5 parts of crystalline flake graphite, 3 parts of calcined alpha-activated alumina micro powder, 1 part of metal silicon powder, 0.5 part of metal aluminum powder, 4 parts of boron carbide, 8 parts of phenolic resin, 5 parts of furfural and 1 part of ethylene glycol;
the aluminum carbon lining comprises the following components in parts by mass: 42 parts of alumina hollow sphere particles, 18 parts of low-alumina mullite powder, 3 parts of crystalline flake graphite, 10 parts of calcined a-activated alumina micro powder, 3 parts of metal silicon powder, 8 parts of phenolic resin and 2 parts of polyvinyl alcohol;
the glaze comprises the following components in parts by mass: 22 parts of low-alumina mullite fine powder slurry, 10 parts of boron glass powder, 12 parts of black silicon carbide, 8 parts of boron carbide, 3 parts of bentonite, 1 part of calcined a-activated alumina micro powder, 3 parts of metal silicon powder, 2 parts of silica sol and 30 parts of water;
the low-alumina mullite, low-alumina mullite powder or low-alumina mullite fine powder slurry is prepared by adopting waste high-voltage ceramic reclaimed materials and performing sorting classification, crushing, screening and iron removal;
Wherein sorting and grading are mainly based on alumina content, al 2 O 3 Waste high-voltage ceramic blocks with the content of 48-56% are coarsely broken and screened, and a high-strength magnetic separator is arranged at the blanking part of each grain grade discharge hole in a breaking and screening system for removing iron;
the waste high-voltage porcelain with the rough breaking less than or equal to 2mm is weighed and poured into a ceramic ball mill, clean tap water is added, and wet milling is carried out for 36 hours, so as to be used as a raw material of glaze;
the granule material with the grain diameter of 2-8 mm enters fine crushing, screening, acid liquor soaking and vibration grinding, wherein the acid liquor soaking treatment is carried out, the acid liquor is oxalic acid with the weight percent of 2-5%, the soaking time is 3 days, the granule material is dried in shade for 24 hours after the soaking, and then is dried at 140 ℃, and the raw material granules and the fine powder are graded according to the grain diameter after the final grinding, and the method comprises the following steps: 0.5-1mm particle material, 0.074-0.5 mm particle material less than 0.074mm, used as raw materials of long nozzle bodies and aluminum carbon linings;
coarse grain return materials with the grain diameter of more than 8mm are broken again.
The embodiment provides a preparation method of an anti-cracking anti-bursting long nozzle for continuous casting, which comprises the following steps:
and (one) preparing a long nozzle body:
(1) Respectively weighing low-alumina mullite, electro-fused white corundum, crystalline flake graphite, brown corundum and calcined alpha-active alumina micropowder according to the parts, and pouring into a transition hopper; the low-alumina mullite is prepared by mixing 0.5-1mm particle materials, 0.074-0.5 mm particle materials and powder less than 0.074mm according to a ratio of 5:3:2, premixing metal silicon powder 1 and metal aluminum powder for 25min by a premixing machine, pouring into a transition hopper, covering moisture-proof cloth, pushing the transition hopper, phenolic resin, furfural and glycol into a 24 ℃ constant temperature and humidity warehouse for 30 hours;
(2) Taking out a transition hopper and corresponding phenolic resin, furfural and ethylene glycol from a constant temperature and humidity warehouse, firstly injecting materials in the transition hopper into a vacuum granulator through a feeding pipe, pre-mixing for 5min at a low speed, injecting wet materials of the furfural and the ethylene glycol when the material temperature is not lower than 35 ℃, starting medium-speed wet mixing, slowly adding phenolic resin powder at the same time, carrying out wet mixing for 6min, vacuumizing the granulator to below 20Pa when the material cavity temperature is 40 ℃, starting high-speed granulation, discharging when the total granulation time is 32min and the material cavity temperature of the granulator is 56 ℃, and drying the granules by adopting a rotary dryer;
and (II) preparing a slag line section:
(1) Respectively weighing stable zirconia particles, stable zirconia fine powder, crystalline flake graphite, calcined alpha-activated alumina micro powder and boron carbide according to the parts, pouring the materials into a transition hopper, premixing metal silicon powder and metal aluminum powder for 25min by a premixing machine, pouring the materials into the transition hopper, covering moisture-proof cloth, and pushing the materials, phenolic resin, furfural and glycol into a constant temperature and humidity warehouse at 24 ℃ for 30 hours;
(2) Taking out a transition hopper, corresponding phenolic resin, furfural and ethylene glycol from a constant temperature and humidity warehouse, injecting a material feeding pipe in the transition hopper into a vacuum granulator, and premixing for 5min at a low speed, wherein the material temperature is not lower than 30 ℃; injecting wet materials of furfural and ethylene glycol, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, wet mixing for 6min, vacuumizing a granulator to below 20Pa when the temperature of a material cavity is 40 ℃, starting high-speed granulation, discharging when the total granulation time is 32min and the temperature of the material cavity of the granulator is 55 ℃, and drying the granular materials by adopting a drying disc;
(III) preparation of an aluminum carbon lining:
(1) Respectively weighing alumina hollow sphere particles, low-alumina mullite, crystalline flake graphite and calcined alpha-active alumina micropowder according to the parts, pouring the alumina hollow sphere particles, the low-alumina mullite, crystalline flake graphite and calcined alpha-active alumina micropowder into a transition hopper, wherein the low-alumina mullite is prepared by mixing 0.5-1mm particle materials, 0.074-0.5 mm particle materials and powder less than or equal to 0.074mm according to the ratio of 4:3:3, pouring metal silicon powder into the transition hopper after premixing for 10min by a premixing machine, covering a dampproof cloth, and pushing the mixture with phenolic resin and polyvinyl alcohol into a constant temperature and humidity warehouse at 24 ℃ for 24 hours;
(2) Taking out the transition hopper, the corresponding phenolic resin and the polyvinyl alcohol from the constant temperature and humidity warehouse, firstly injecting a material feeding pipe in the transition hopper into a vacuum granulator, and premixing for 5min at a low speed, wherein the material temperature is not lower than 30 ℃; injecting polyvinyl alcohol, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, wet mixing for 6min, vacuumizing a granulator to below 20Pa when the temperature of a material cavity is 40 ℃, starting high-speed granulation, discharging when the total granulation time is 36min and the temperature of the material cavity of the granulator is 55 ℃, and drying the granules by adopting a rotary dryer;
(IV) charging and press forming: according to the technological requirements, installing a core rod and a rubber sleeve, respectively filling an aluminum-carbon inner lining material, a long nozzle body material and a slag line section material, vibrating and compacting, covering a rubber cover, performing waterproof treatment, and then sending into an isostatic pressing machine for pressing and forming, wherein the maximum forming pressure is 120MPa.
And (V) heat treatment: and (3) carrying out heat treatment on the long water gap formed by compression, wherein the temperature is 220 ℃ and the time is 8 hours.
And (six) machining: cutting and turning according to the requirements of the drawing of the product;
and (seventh) glaze spraying: waste high-voltage ceramic materials with the rough breaking diameter less than or equal to 2mm are weighed and poured into a ceramic ball mill, clean tap water is added, and wet milling is carried out for 30 hours to prepare slurry for later use, so as to obtain low-alumina mullite fine powder slurry;
respectively weighing the low-alumina mullite fine powder slurry, boron glass powder, black silicon carbide, boron carbide, bentonite, calcined a-activated alumina micropowder, metal silicon powder, silica sol and water according to the parts, and injecting into a ceramic ball mill, and jointly wet-milling for 45min to obtain the long-nozzle glaze;
sending the burnt and machined anti-cracking long water gap into a heating furnace, preheating to 70 ℃, preserving heat for 15min, taking out, spraying the prepared glaze on the surface of the long water gap through a spray gun, and controlling the thickness of the glaze to be 0.4mm;
(eighth) firing: and (3) delivering the semi-finished product subjected to glaze spraying into a high-temperature kiln for firing, wherein the highest temperature is 950 ℃, and preserving heat for 8 hours.
And (nine) installing accessories such as iron shells, argon blowing nozzles and the like, and detecting and boxing to obtain the long nozzle product.
The granularity of the electro-fused white corundum is 1-0.5 mm, al 2 O 3 ≥99.3％，SiO 2 ≤0.1％，Fe 2 O 3 ≤0.08％。
The flake graphite adopts natural flake graphite with granularity less than 0.15mm and carbon content more than or equal to 96 wt%.
The granularity of the metal silicon powder is less than 0.074mm; siO (SiO) 2 The content is more than or equal to 98 weight percent, and the Fe2O3 is less than 1.2 weight percent.
Brown corundum Al as described above 2 O 3 The content is more than or equal to 95 weight percent, siO 2 ≤0.7wt％，Fe 2 O 3 Less than or equal to 0.8 weight percent, adopts the mixture of three different granularities, and is respectively 1 to 0.5mm，0.5～0.074mm，＜0.074mm；。
Calcining a-Al as described above 2 O 3 The micro powder adopts calcined active a-corundum micro powder, and the particle diameter D of the calcined active a-corundum micro powder 50 Less than 2 μm, primary grain size less than 1.5 μm; al (Al) 2 O 3 The content is more than or equal to 99.5wt percent, and the true specific gravity is more than or equal to 3.92g/cm 3 。
The phenolic resin is thermoplastic phenolic resin, the fluidity of the phenolic resin is 20-40 mm, the residual carbon content is more than or equal to 45%, and free phenol: 2.0 to 4.0 percent, and-140 meshes of more than or equal to 95 percent of yellow-white powdery refractory material binding agent.
The purity of the furfural is more than or equal to 98.5 percent, and the density is more than or equal to 1.15g/cm 3 ；
The purity of the glycol is more than or equal to 98.5 percent, and the density is more than or equal to 1.10g/cm 3 ；
Al of the above magnesium aluminate spinel 2 O 3 The content is more than or equal to 68wt percent, the MgO is more than or equal to 22wt percent, and Fe 2 O 3 Less than or equal to 0.6wt percent; the granularity is respectively as follows: 1 to 0.5mm,0.5 to 0.12mm, less than 0.074mm;
the stable zirconia adopts calcium oxide or yttrium oxide as a stabilizer, and fully reacts in a furnace at a temperature higher than 1650 ℃ for more than 5 hours to form stable cubic zirconia, wherein ZrO 2 More than or equal to 95 weight percent, and the stabilization rate is more than or equal to 85 percent; the granularity is respectively as follows: 0.25-0.15 mm, 0.15-0.1 mm less than 0.044mm;
The boron carbide B 4 The content of C is more than or equal to 88 weight percent, and the granularity is less than or equal to 0.044mm.
The black silicon carbide SiC is more than or equal to 95 weight percent, and the granularity is less than or equal to 0.044mm.
Example 2
The main difference between this embodiment and embodiment 1 is that: the long nozzle body comprises the following components in parts by mass: 24 parts of low-alumina mullite, 23 parts of fused white corundum, 22 parts of crystalline flake graphite, 25 parts of brown corundum, 2 parts of calcined a-corundum micropowder, 2 parts of metal silicon powder, 1 part of metal aluminum powder, 10 parts of phenolic resin, 5 parts of furfural and 1.5 parts of ethylene glycol;
the slag line section comprises the following components in parts by mass: 40 parts of stabilized zirconia particles, 24 parts of stabilized zirconia fine powder, 8 parts of crystalline flake graphite, 4 parts of calcined alpha-activated alumina micro powder, 2 parts of metal silicon powder, 1.5 parts of metal aluminum powder, 5 parts of boron carbide, 10 parts of phenolic resin, 5.5 parts of furfural and 1.5 parts of ethylene glycol;
the aluminum carbon lining comprises the following components in parts by mass: 44 parts of alumina hollow sphere particles, 23 parts of low alumina mullite, 7 parts of crystalline flake graphite, 13 parts of calcined alpha-active alumina micro powder, 5 parts of metal silicon powder, 12 parts of phenolic resin and 3 parts of polyvinyl alcohol;
the glaze comprises the following components in parts by mass: 24 parts of low-alumina mullite fine powder slurry, 11 parts of boron glass powder, 14 parts of black silicon carbide, 9 parts of boron carbide, 4 parts of bentonite, 2 parts of calcined a-activated alumina micro powder, 4 parts of metal silicon powder, 4 parts of silica sol and 31 parts of water;
The low-alumina mullite or the low-alumina mullite powder is prepared by adopting waste high-voltage ceramic reclaimed materials and performing sorting classification, crushing, screening and deironing;
wherein sorting and grading are mainly based on alumina content, al 2 O 3 Waste high-voltage ceramic blocks with the content of 48-56% are coarsely broken and screened, and a high-strength magnetic separator is arranged at the blanking part of each grain grade discharge hole in a breaking and screening system for removing iron;
the waste high-voltage porcelain with the rough breaking less than or equal to 2mm is weighed and poured into a ceramic ball mill, clean tap water is added according to the weight, and then wet milling is carried out for 33 hours, so as to be used as a raw material of glaze;
the granule materials with the grain diameter of 2-8 mm enter fine crushing, screening, acid liquor soaking and vibration grinding, wherein the acid liquor soaking treatment is carried out, the acid liquor is 2-5wt% of organic acid such as oxalic acid, tartaric acid and the like, the soaking time is 4 days, the granule materials are dried in shade for 24-48 hours after being soaked, and then are dried at 145 ℃, and the raw material granules and the fine powder are graded according to the grain diameter after being finally ground according to parts by weight: 0.5-1mm of particles, 0.074-0.5 mm of particles, less than or equal to 0.074mm of powder, and the powder is used as raw materials of a long nozzle body and an aluminum carbon lining;
coarse grain return materials with the grain diameter of more than 8mm are broken again.
The embodiment provides a preparation method of an anti-cracking anti-bursting long nozzle for continuous casting, which comprises the following steps:
and (one) preparing a long nozzle body:
(1) Respectively weighing low-alumina mullite, electro-fused white corundum, crystalline flake graphite, brown corundum and calcined alpha-active alumina micropowder according to the parts, and pouring into a transition hopper; the low-alumina mullite is prepared by mixing 0.5-1mm particle materials, 0.074-0.5 mm particle materials and powder less than or equal to 0.074mm according to a ratio of 5:3:2, premixing metal silicon powder and metal aluminum powder for 30min by a premixing machine, pouring into a transition hopper, covering moisture-proof cloth, pushing the transition hopper, phenolic resin, furfural and glycol into a 24 ℃ constant temperature and humidity warehouse for 36 hours;
(2) Taking out a transition hopper and corresponding phenolic resin, furfural and ethylene glycol from a constant temperature and humidity warehouse, firstly injecting materials in the transition hopper into a vacuum granulator through a feeding pipe, premixing for 5min at a low speed, injecting wet materials of the furfural and the ethylene glycol when the material temperature is not lower than 35 ℃, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, carrying out wet mixing for 6min, vacuumizing the granulator to below 20Pa when the material cavity temperature is 40 ℃, starting high-speed granulation, controlling the total granulation time to be 32min, opening a discharge valve to discharge when the material cavity temperature of the granulator is 53 ℃, and adopting a rotary dryer or a drying disc to dry the granules;
And (II) preparing a slag line section:
(1) Weighing stable zirconia particles, stable zirconia fine powder, crystalline flake graphite, calcined alpha-active alumina micro powder and boron carbide, pouring into a transition hopper, premixing metal silicon powder and metal aluminum powder for 30min by a premixing machine, pouring into the transition hopper, covering moisture-proof cloth, pushing into a 24 ℃ constant temperature and humidity warehouse together with phenolic resin, furfural and glycol, and storing for 30 hours;
(2) Taking out a transition hopper, corresponding phenolic resin, furfural and ethylene glycol from a constant temperature and humidity warehouse, injecting a material feeding pipe in the transition hopper into a vacuum granulator, and premixing for 5min at a low speed, wherein the material temperature is not lower than 30 ℃; injecting wet materials of furfural and ethylene glycol, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, wet mixing for 6min, vacuumizing a granulator to below 20Pa when the temperature of a material cavity is 40 ℃, starting high-speed granulation, discharging when the total granulation time is 42min and the temperature of the material cavity of the granulator is 58 ℃, and drying the granules by adopting a rotary dryer;
(III) preparation of an aluminum carbon lining:
(1) Respectively weighing alumina hollow sphere particles, low-alumina mullite, crystalline flake graphite and calcined alpha-active alumina micropowder according to the parts, pouring the alumina hollow sphere particles, the low-alumina mullite, crystalline flake graphite and calcined alpha-active alumina micropowder into a transition hopper, wherein the low-alumina mullite is prepared by mixing 0.5-1mm particle materials, 0.074-0.5 mm particle materials and powder less than or equal to 0.074mm according to the ratio of 4:3:3, pouring metal silicon powder into the transition hopper after premixing for 15min by a premixing machine, covering a dampproof cloth, and pushing the mixture with phenolic resin and polyvinyl alcohol into a 24 ℃ constant temperature and humidity warehouse for 30 hours;
(2) Taking out the transition hopper, the corresponding phenolic resin and the polyvinyl alcohol from the constant temperature and humidity warehouse, firstly injecting a material feeding pipe in the transition hopper into a vacuum granulator, and premixing for 5min at a low speed, wherein the material temperature is not lower than 30 ℃; injecting polyvinyl alcohol, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, wet mixing for 6min, vacuumizing a granulator to below 20Pa when the temperature of a material cavity is 40 ℃, starting high-speed granulation, discharging when the total granulation time is 34min and the temperature of the material cavity of the granulator is 56 ℃, and drying the granules by adopting a drying disc;
(IV) charging and press forming: according to the technological requirements, installing a core rod and a rubber sleeve, respectively filling an aluminum-carbon inner lining material, a long nozzle body material and a slag line section material, vibrating and compacting, covering a rubber cover, performing waterproof treatment, and then sending into an isostatic pressing machine for pressing and forming, wherein the maximum forming pressure is 120MPa.
And (V) heat treatment: and (3) carrying out heat treatment on the long water gap formed by compression, wherein the temperature is 220 ℃ and the time is 8 hours.
And (six) machining: cutting and turning according to the requirements of the drawing of the product;
and (seventh) glaze spraying: waste high-voltage ceramic materials with the rough breaking diameter less than or equal to 2mm are weighed and poured into a ceramic ball mill, clean tap water is added, and wet milling is carried out for 30 hours to prepare slurry for later use, so as to obtain low-alumina mullite fine powder slurry;
Respectively weighing low-alumina mullite fine powder slurry, boron glass powder, black silicon carbide, boron carbide, bentonite, calcined a-activated alumina micro powder, metal silicon powder, silica sol and water according to the parts, and injecting the mixture into a ceramic ball mill to jointly wet-grind for 50min, thus obtaining the long-nozzle glaze;
sending the burnt and machined anti-cracking long water gap into a heating furnace, preheating to 70 ℃, preserving heat for 15min, taking out, spraying the prepared glaze on the surface of the long water gap through a spray gun, and controlling the thickness of the glaze to be 0.5mm;
(eighth) firing: and (5) delivering the semi-finished product subjected to glaze spraying into a high-temperature kiln for firing, wherein the highest temperature is 980 ℃, and preserving heat for 6 hours.
And (nine) installing accessories such as iron shells, argon blowing nozzles and the like, and detecting and boxing to obtain the long nozzle product.
Example 3
This embodiment differs from embodiments 1 and 2 mainly in that: the long nozzle body comprises the following components in parts by mass: 26 parts of low-alumina mullite, 25 parts of fused white corundum, 25 parts of crystalline flake graphite, 26 parts of brown corundum, 3 parts of calcined a-corundum micropowder, 2.5 parts of metal silicon powder, 2 parts of metal aluminum powder, 11 parts of phenolic resin, 6 parts of furfural and 2 parts of ethylene glycol;
the slag line section comprises the following components in parts by mass: 42 parts of stabilized zirconia particles, 26 parts of stabilized zirconia fine powder, 10 parts of crystalline flake graphite, 5 parts of calcined alpha-activated alumina micro powder, 2.5 parts of metal silicon powder, 2 parts of metal aluminum powder, 6 parts of boron carbide, 11 parts of phenolic resin, 6 parts of furfural and 2 parts of ethylene glycol;
The aluminum carbon lining comprises the following components in parts by mass: 45 parts of alumina hollow sphere particles, 26 parts of low alumina mullite, 10 parts of crystalline flake graphite, 15 parts of calcined alpha-active alumina micro powder, 6 parts of metal silicon powder, 15 parts of phenolic resin and 3 parts of polyvinyl alcohol;
the glaze comprises the following components in parts by mass: 26 parts of low-alumina mullite fine powder slurry, 12 parts of boron glass powder, 15 parts of black silicon carbide, 10 parts of boron carbide, 5 parts of bentonite, 3 parts of calcined a-activated alumina micro powder, 5 parts of metal silicon powder, 6 parts of silica sol and 32 parts of water;
the low-alumina mullite or the low-alumina mullite powder is prepared by adopting waste high-voltage ceramic reclaimed materials and performing sorting classification, crushing, screening and deironing;
wherein sorting and grading are mainly based on alumina content, al 2 O 3 Waste high-voltage ceramic blocks with the content of 48-56% are coarsely broken and screened, and a high-strength magnetic separator is arranged at the blanking part of each grain grade discharge hole in a breaking and screening system for removing iron;
the waste high-voltage porcelain with the rough breaking less than or equal to 2mm is weighed and poured into a ceramic ball mill, clean tap water is added according to the weight, and then wet milling is carried out for 36 hours, so as to be used as a raw material of glaze;
the granule materials with the grain diameter of 2-8 mm enter fine crushing, screening, acid liquor soaking and vibration grinding, wherein the acid liquor soaking treatment is carried out, the acid liquor is 2-5wt% of organic acid such as oxalic acid, tartaric acid and the like, the soaking time is 5 days, the granule materials are dried in shade for 48 hours after being soaked, and then are dried at 150 ℃, and the raw material granules and the fine powder are graded according to the grain diameter after the final grinding according to parts by weight: 0.5-1mm of particles, 0.074-0.5 mm of particles, less than or equal to 0.074mm of 2mm of powder, and the powder is used as raw materials of a long nozzle body and an aluminum carbon lining;
Coarse grain return materials with the grain diameter of more than 8mm are broken again.
The embodiment provides a preparation method of an anti-cracking anti-bursting long nozzle for continuous casting, which comprises the following steps:
and (one) preparing a long nozzle body:
(1) Respectively weighing low-alumina mullite, electro-fused white corundum, crystalline flake graphite, brown corundum and calcined alpha-active alumina micropowder according to the parts, and pouring into a transition hopper; the low-alumina mullite is prepared by mixing 0.5-1mm particle materials, 0.074-0.5 mm particle materials and powder less than or equal to 0.074mm according to a ratio of 5:3:2, pre-mixing metal silicon powder and metal aluminum powder for 30min by a pre-mixer, pouring into a transition hopper, covering moisture-proof cloth, pushing the transition hopper, phenolic resin, furfural and glycol into a 24 ℃ constant temperature and humidity warehouse for 30 hours;
(2) Taking out a transition hopper and corresponding phenolic resin, furfural and ethylene glycol from a constant temperature and humidity warehouse, firstly injecting materials in the transition hopper into a vacuum granulator through a feeding pipe, pre-mixing for 5min at a low speed, injecting wet materials of the furfural and the ethylene glycol when the material temperature is not lower than 35 ℃, starting medium-speed wet mixing, slowly adding phenolic resin powder at the same time, carrying out wet mixing for 6min, vacuumizing the granulator to below 20Pa when the material cavity temperature is 40 ℃, starting high-speed granulation, discharging when the total granulation time is 30min and the material cavity temperature of the granulator is 57 ℃, and drying the granules by adopting a rotary dryer;
And (II) preparing a slag line section:
(1) Respectively weighing stable zirconia particles, stable zirconia fine powder, crystalline flake graphite, calcined alpha-activated alumina micro powder and boron carbide according to the parts, pouring the materials into a transition hopper, premixing metal silicon powder and metal aluminum powder for 30min by a premixing machine, pouring the materials into the transition hopper, covering moisture-proof cloth, pushing the materials together with phenolic resin, furfural and glycol into a constant temperature and humidity warehouse at 24 ℃ for 30 hours;
(2) Taking out a transition hopper, corresponding phenolic resin, furfural and ethylene glycol from a constant temperature and humidity warehouse, injecting a material feeding pipe in the transition hopper into a vacuum granulator, and premixing for 5min at a low speed, wherein the material temperature is not lower than 30 ℃; injecting wet materials of furfural and ethylene glycol, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, wet mixing for 6min, vacuumizing a granulator to below 20Pa when the temperature of a material cavity is 40 ℃, starting high-speed granulation, discharging when the total granulation time is 34min and the temperature of the material cavity of the granulator is 60 ℃, and drying the granules by adopting a rotary dryer;
(III) preparation of an aluminum carbon lining:
(1) Respectively weighing alumina hollow sphere particles, low-alumina mullite, crystalline flake graphite and calcined alpha-active alumina micropowder according to the parts, pouring the alumina hollow sphere particles, the low-alumina mullite, crystalline flake graphite and calcined alpha-active alumina micropowder into a transition hopper, wherein the low-alumina mullite is prepared by mixing 0.5-1mm particle materials, 0.074-0.5 mm particle materials and powder less than or equal to 0.074mm according to the ratio of 4:3:3, pouring metal silicon powder into the transition hopper after premixing for 15min by a premixing machine, covering a dampproof cloth, and pushing the mixture with phenolic resin and polyvinyl alcohol into a 24 ℃ constant temperature and humidity warehouse for 30 hours;
(2) Taking out the transition hopper, the corresponding phenolic resin and the polyvinyl alcohol from the constant temperature and humidity warehouse, firstly injecting a material feeding pipe in the transition hopper into a vacuum granulator, and premixing for 5min at a low speed, wherein the material temperature is not lower than 30 ℃; injecting polyvinyl alcohol, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, wet mixing for 6min, vacuumizing a granulator to below 20Pa when the temperature of a material cavity is 40 ℃, starting high-speed granulation, discharging when the total granulation time is 36min and the temperature of the material cavity of the granulator is 59 ℃, and drying the granules by adopting a rotary dryer;
(IV) charging and press forming: according to the technological requirements, installing a core rod and a rubber sleeve, respectively filling an aluminum-carbon inner lining material, a long nozzle body material and a slag line section material, vibrating and compacting, covering a rubber cover, performing waterproof treatment, and then sending into an isostatic pressing machine for pressing and forming, wherein the maximum forming pressure is 120MPa.
And (V) heat treatment: and (3) carrying out heat treatment on the long water gap formed by compression, wherein the temperature is 200 ℃ and the time is 8 hours.
And (six) machining: cutting and turning according to the requirements of the drawing of the product;
and (seventh) glaze spraying: waste high-voltage ceramic materials with the rough breaking of less than or equal to 2mm are weighed and poured into a ceramic ball mill, clean tap water is added, and wet milling is carried out for 24-36 hours for pulping for standby, thus obtaining low-aluminum mullite fine powder slurry;
Respectively weighing low-alumina mullite fine powder slurry, boron glass powder, black silicon carbide, boron carbide, bentonite, calcined a-activated alumina micropowder, metal silicon powder, silica sol and water according to the parts, and injecting into a ceramic ball mill to jointly wet-mill for 60min to obtain the long-nozzle glaze;
sending the burnt and machined anti-cracking long water gap into a heating furnace, preheating to 70 ℃, preserving heat for 15min, taking out, spraying the prepared glaze on the surface of the long water gap through a spray gun, and controlling the thickness of the glaze to be 0.5mm;
(eighth) firing: and (5) delivering the semi-finished product subjected to glaze spraying into a high-temperature kiln for sintering, wherein the sintering highest temperature is 1000 ℃, and preserving heat for 6.5 hours.
And (nine) installing accessories such as iron shells, argon blowing nozzles and the like, and detecting and boxing to obtain the long nozzle product.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a continuous casting steel package anti-burst long mouth of a river which characterized in that: the aluminum carbon inner lining is arranged on the inner side of the whole long water gap, and meanwhile, a layer of glaze is coated on the outer side of the whole long water gap;
the long nozzle body material comprises the following components in parts by weight: 18-26 parts of low-aluminum mullite, 20-25 parts of fused white corundum, 18-25 parts of crystalline flake graphite, 23-26 parts of brown corundum, 1-3 parts of calcined alpha-corundum micropowder, 1-2.5 parts of metal silicon powder, 0.5-2 parts of metal aluminum powder, 8-11 parts of phenolic resin, 5-6 parts of furfural and 1-2 parts of ethylene glycol;
the slag line comprises the following components in parts by weight: 38-42 parts of stabilized zirconia particles, 22-26 parts of stabilized zirconia fine powder, 5-10 parts of crystalline flake graphite, 3-5 parts of calcined alpha-active alumina micro powder, 1-2.5 parts of metal silicon powder, 0.5-2 parts of metal aluminum powder, 4-6 parts of boron carbide, 8-11 parts of phenolic resin, 5-6 parts of furfural and 1-2 parts of ethylene glycol;
The aluminum carbon lining comprises the following components in parts by weight: 42-45 parts of alumina hollow sphere particles, 18-26 parts of low-alumina mullite, 3-10 parts of crystalline flake graphite, 10-15 parts of calcined alpha-active alumina micro powder, 3-6 parts of metal silicon powder, 8-15 parts of phenolic resin and 2-3 parts of polyvinyl alcohol.
2. The continuous casting steel ladle burst-resistant long nozzle as claimed in claim 1, wherein: spraying a layer of glaze on the whole surface of the long nozzle, wherein the glaze comprises the following components in parts by mass: 22-26 parts of low-alumina mullite fine powder slurry, 10-12 parts of boron glass powder, 12-15 parts of black silicon carbide, 8-10 parts of boron carbide, 3-5 parts of bentonite, 1-3 parts of calcined a-active alumina micro powder, 3-5 parts of metal silicon powder, 2-6 parts of silica sol and 30-32 parts of water.
3. The continuous casting steel ladle burst-resistant long nozzle as claimed in claim 2, wherein: the low-alumina mullite or low-alumina mullite fine powder slurry is prepared by adopting waste high-voltage ceramic reclaimed materials and performing sorting classification, crushing, screening and iron removal;
wherein sorting and grading are mainly based on alumina content, al 2 O 3 Waste high-voltage ceramic blocks with the content of 48-56% are subjected to coarse crushing and screening, and a high-strength magnetic separator is arranged at the blanking part of each grain grade discharge hole in a crushing and screening system for removing iron;
The waste high-voltage porcelain with the rough breaking less than or equal to 2mm is weighed and poured into a ceramic ball mill, 30-33 wt% of clean tap water is added according to the weight, and then wet milling is carried out for 24-36 hours, so as to obtain low-alumina mullite fine powder slurry in glaze;
the granule materials with the grain diameter of 2-8 mm enter fine crushing, screening, acid liquor soaking and vibration grinding, and the raw material granules and the fine powder are graded according to the grain diameter after final grinding, and the method comprises the following steps: 0.5-1mm particle material, 0.074-0.5 mm particle material, less than or equal to 0.074mm powder material, which is used as raw materials of the long nozzle body and the aluminum carbon lining;
coarse grain return materials with the grain diameter of more than 8mm are broken again.
4. A continuous casting steel ladle burst-resistant long nozzle as claimed in claim 3, wherein: the acid liquor soaking is specifically carried out by adopting 2-5wt% of organic acid, soaking time is 3-5 days, drying the granules in shade for 24-48 hours after the soaking is finished, and drying at 140-150 ℃.
5. The method for preparing the continuous casting steel ladle anti-bursting long nozzle according to any one of claims 1 to 4, which is characterized in that: the method comprises the following steps:
preparing a long nozzle body material:
(1) Weighing 18-26 parts of low-alumina mullite, 20-25 parts of fused white corundum, 18-25 parts of crystalline flake graphite, 23-26 parts of brown corundum and 1-3 parts of calcined alpha-active alumina micropowder according to parts by weight, and pouring into a transition hopper; 1 to 2.5 parts of metal silicon powder and 0.5 to 2 parts of metal aluminum powder are premixed for 20 to 30 minutes by a premixing machine, poured into a transition hopper, covered with moisture-proof cloth, and pushed into a constant temperature and humidity warehouse at 24 ℃ for 24 to 36 hours together with 8 to 11 parts of phenolic resin, 5 to 6 parts of furfural and 1 to 2 parts of ethylene glycol;
(2) Taking out a transition hopper and corresponding phenolic resin, furfural and ethylene glycol from a constant temperature and humidity warehouse, firstly injecting materials in the transition hopper into a vacuum granulator through a feeding pipe, pre-mixing at a low speed for 3-5 min, injecting wet materials of the furfural and the ethylene glycol when the material temperature is not lower than 35 ℃, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, carrying out wet mixing for 5-6 min, vacuumizing the granulator to 20Pa or lower when the material cavity temperature is 40 ℃, starting high-speed granulation, controlling the total granulation time to be 30-32 min or the material cavity temperature of the granulator to be more than or equal to 55 ℃, opening a discharge valve to discharge when the material temperature is not lower than 35 ℃, and drying the granules by adopting a rotary dryer or a drying disc;
and (II) preparing slag wires:
(1) Weighing 38-42 parts of stable zirconia particles, 22-26 parts of stable zirconia fine powder, 5-10 parts of crystalline flake graphite, 3-5 parts of calcined alpha-active alumina micro powder and 4-6 parts of boron carbide, pouring into a transition hopper, premixing 1-2.5 parts of metal silicon powder and 0.5-2 parts of metal aluminum powder for 20-30 min by a premixing machine, pouring into the transition hopper, covering damp-proof cloth, and pushing into a 24 ℃ constant temperature and humidity warehouse together with 8-11 parts of phenolic resin, 5-6 parts of furfural and 1-2 parts of ethylene glycol for storage for 24-36 hours;
(2) Taking out a transition hopper, corresponding phenolic resin, furfural and ethylene glycol from a constant temperature and humidity warehouse, injecting a material feeding pipe in the transition hopper into a vacuum granulator, and premixing for 3-5 min at a low speed, wherein the material temperature is not lower than 30 ℃; injecting wet materials of furfural and ethylene glycol, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, wet mixing for 5-6 min, vacuumizing a granulator to below 20Pa when the temperature of a material cavity is 40 ℃, starting high-speed granulation, and discharging when the total granulation time is not less than 30min or the temperature of the material cavity of the granulator is not less than 50 ℃, wherein the two materials meet the conditions that a discharge valve is started to discharge; and drying the granules using a rotary dryer or a drying tray;
and (III) preparing an aluminum carbon lining material:
(1) Weighing 42-45 parts of alumina hollow sphere particles, 18-26 parts of low-alumina mullite, 3-10 parts of crystalline flake graphite and 10-15 parts of calcined alpha-active alumina micropowder, pouring into a transition hopper, premixing 3-6 parts of metal silicon powder for 10-15min by a premixing machine, pouring into the transition hopper, covering a dampproof cloth, and pushing the mixture with 8-15 parts of phenolic resin and 2-3 parts of polyvinyl alcohol into a 24 ℃ constant temperature and humidity warehouse for storage for 24-36 hours;
(2) Taking out the transition hopper, the corresponding phenolic resin and the polyvinyl alcohol from the constant temperature and humidity warehouse, firstly injecting a material feeding pipe in the transition hopper into a vacuum granulator, and premixing for 3-5 min at a low speed, wherein the material temperature is not lower than 30 ℃; injecting polyvinyl alcohol, starting medium-speed wet mixing, simultaneously slowly adding phenolic resin powder, wet mixing for 5-6 min, vacuumizing a granulator to below 20Pa when the temperature of a material cavity is 40 ℃, starting high-speed granulation, starting a discharge valve to discharge when the total granulation time is not less than 30min or the temperature of the material cavity of the granulator is 55 ℃, and adopting a rotary dryer or a drying disc to dry the granules;
(IV) charging and press forming: according to the technological requirements, installing a core rod and a rubber sleeve, respectively filling an aluminum-carbon inner lining material, a long nozzle body material and a slag line section material, vibrating and compacting, covering a rubber cover, performing waterproof treatment, and then sending into an isostatic pressing machine for pressing and forming, wherein the maximum forming pressure is 120MPa.
6. And (V) heat treatment: and (3) conveying the long water gap formed by compression into a curing kiln for heat treatment, wherein the highest temperature is 180-250 ℃ and the time is 8 hours.
7. And (six) machining: cutting and turning according to the requirements of the drawing of the product;
and (seventh) glaze spraying: waste high-voltage ceramic materials with the rough breaking of less than or equal to 2mm are weighed and poured into a ceramic ball mill, 30-33 wt% of clean tap water is added, and wet milling is carried out for 24-36 hours for pulping for standby, thus obtaining low-aluminum mullite fine powder slurry;
weighing 22-26 parts of low-alumina mullite fine powder slurry, 10-12 parts of boron glass powder, 12-15 parts of black silicon carbide, 8-10 parts of boron carbide, 3-5 parts of bentonite, 1-3 parts of calcined a-active alumina micro powder, 3-5 parts of metal Si powder, 2-6 parts of silica sol and 30-32 parts of water, injecting the mixture into a ceramic ball mill, and carrying out common wet milling for 30-60 min to obtain a long water gap glaze;
the explosion-proof long water gap blank body subjected to heat treatment and machining is sent into a heating furnace to be preheated to 60-70 ℃, the heat preservation is carried out for 10-15 min, then the blank body is taken out, the prepared glaze is sprayed on the surface of the long water gap through a spray gun, and the thickness of the glaze is controlled to be 0.4-0.5 mm;
(eighth) firing: and (3) delivering the semi-finished product subjected to glaze spraying into a high-temperature kiln for firing, wherein the highest temperature of the firing is 900-1000 ℃, and preserving heat for 6-8h.
8. And (nine) installing accessories such as an iron shell, an argon blowing nozzle and the like, and detecting and boxing to obtain the long nozzle product.
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| CN117226083A (en) * | 2023-11-14 | 2023-12-15 | 山西昊业新材料开发有限公司 | Long nozzle for continuous casting and preparation method thereof |
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| CN117226083A (en) * | 2023-11-14 | 2023-12-15 | 山西昊业新材料开发有限公司 | Long nozzle for continuous casting and preparation method thereof |
| CN117226083B (en) * | 2023-11-14 | 2024-01-26 | 山西昊业新材料开发有限公司 | Long nozzle for continuous casting and preparation method thereof |
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