CN112592163A - Ladle upper nozzle castable, prefabricated part and preparation method thereof - Google Patents

Ladle upper nozzle castable, prefabricated part and preparation method thereof Download PDF

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Publication number
CN112592163A
CN112592163A CN202110229881.4A CN202110229881A CN112592163A CN 112592163 A CN112592163 A CN 112592163A CN 202110229881 A CN202110229881 A CN 202110229881A CN 112592163 A CN112592163 A CN 112592163A
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China
Prior art keywords
parts
ladle
nozzle
particle size
castable
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CN202110229881.4A
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Chinese (zh)
Inventor
王团收
李健
刘丽
贾详超
任林
颜浩
张盛
刘靖轩
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Beijing Lier High Temperature Materials Co Ltd
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Beijing Lier High Temperature Materials Co Ltd
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Priority to CN202110229881.4A priority Critical patent/CN112592163A/en
Publication of CN112592163A publication Critical patent/CN112592163A/en
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
    • C04B35/101Refractories from grain sized mixtures
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00Clay-wares
    • C04B33/02Preparing or treating the raw materials individually or as batches
    • C04B33/13Compounding ingredients
    • C04B33/132Waste materials; Refuse; Residues
    • C04B33/1324Recycled material, e.g. tile dust, stone waste, spent refractory material
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C04B2235/3222Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3231Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3241Chromium oxides, chromates, or oxide-forming salts thereof
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607Thermal properties, e.g. thermal expansion coefficient
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9669Resistance against chemicals, e.g. against molten glass or molten salts
    • C04B2235/9676Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00Technologies relating to the processing of minerals
    • Y02P40/60Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

Abstract

The invention provides a ladle upper nozzle castable, a prefabricated member and a preparation method thereof, wherein the preparation raw materials of the ladle upper nozzle castable comprise the following components in parts by mass: 10-60 parts of tabular corundum, 5-50 parts of waste ceramic particles, 5-50 parts of waste air brick particles, 10-60 parts of fused magnesia-alumina spinel, 0.5-20 parts of white corundum, 0.5-20 parts of alpha alumina micropowder, 1-10 parts of pure calcium aluminate cement, 0.5-10 parts of chromium oxide, 0.01-0.3 part of organic fiber, 0.05-2 parts of water reducing agent and 0.005-0.2 part of metal aluminum powder. The ladle upper nozzle castable is resistant to scouring and corrosion, long in service life, and capable of reducing the replacement times of the upper nozzle in one ladle service and reducing the influence on steel mill production to the maximum extent on the premise of ensuring safety.

Description

Ladle upper nozzle castable, prefabricated part and preparation method thereof
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a ladle upper nozzle castable, a prefabricated member and a preparation method thereof.
Background
The steel ladle needs to control the outflow and stop of molten steel through the mechanism in the steel casting process of the continuous casting platform, the water feeding port is an important part for connecting a steel ladle lining and the mechanism, and the inner diameter of the water feeding port can be gradually increased due to the fact that the water feeding port is continuously washed and eroded by the molten steel in the using process, so that the gap between the water feeding port and the upper sliding plate is enlarged, and the matching accuracy of the water feeding port and the upper sliding plate is gradually reduced. Therefore, the upper nozzle needs to be dismantled and replaced according to the situation when reaching a certain service life, otherwise, steel leakage between the upper nozzle and the upper sliding plate can occur, and the consequence is serious.
When the ladle has a turnover, the replacement of the water feeding port is time-consuming and labor-consuming work, so that the labor intensity of workers is high, and the problem that the production rhythm is influenced due to too long time for replacing the water feeding port can also occur. Therefore, the service life of the water feeding port is prolonged as far as possible, and the replacement frequency of the water feeding port in one ladle service is reduced, so that the influence on the production of a steel mill can be reduced to the maximum extent on the premise of ensuring safety.
Disclosure of Invention
The invention aims to provide a ladle upper nozzle castable, a prefabricated member and a preparation method thereof, wherein the ladle upper nozzle castable is resistant to scouring and corrosion and long in service life, the number of times of replacing an upper nozzle in one ladle service is reduced, and the influence on steel mill production can be reduced to the maximum extent on the premise of ensuring safety.
In order to solve the above problems, one aspect of the present invention provides a castable for a ladle upper nozzle, which comprises the following raw materials, by mass:
10-60 parts of tabular corundum, 5-50 parts of waste ceramic particles, 5-50 parts of waste air brick particles, 10-60 parts of fused magnesia-alumina spinel, 0.5-20 parts of white corundum, 0.5-20 parts of alpha alumina micropowder, 1-10 parts of pure calcium aluminate cement, 0.5-10 parts of chromium oxide, 0.01-0.3 part of organic fiber, 0.05-2 parts of water reducing agent and 0.005-0.2 part of metal aluminum powder.
The ladle upper nozzle castable adopts the plate-shaped corundum, the waste ceramic particles and the waste air brick particles as aggregates, after the plate-shaped corundum, the waste ceramic particles and the waste air brick particles with irregular shapes are mixed, the particles are mutually occluded, so that the bending strength and the compressive strength of the composition are far higher than those of any single particle combination, the obtained ladle upper nozzle castable is bent, high in compressive strength and long in service life through the allocation of other components in raw materials and the interaction among the components, the number of times of replacing an upper nozzle in a ladle service is reduced, and the influence on steel mill production can be reduced to the greatest extent on the premise of ensuring safety.
Wherein the waste ceramic particles are recycled high-temperature-resistant ceramics such as industrial crucibles, thermal barrier coatings and the like, and are obtained by crushing, impurity removal and screening. The waste air brick particles are recycled residual air brick materials of off-line steel ladles in the field, and are obtained after crushing, impurity removal and screening, the air brick core is a functional material with the worst working environment in the steel ladles and is a bridge for contacting high-temperature molten steel with room-temperature gas, the overall thermal shock resistance and erosion resistance of the air brick core are high in requirement, and the air brick core is added into the material in a proper proportion, so that the erosion resistance of the molten steel can be enhanced to a certain extent, the erosion degree of the molten steel is reduced, and the service life is prolonged. The invention adopts the waste ceramic particles and the waste air brick particles as raw materials, fully utilizes waste resources, and has important significance for the development of circular economy and the reduction of the production cost of refractory materials.
Preferably, the preparation raw materials comprise the following components in parts by weight:
20-40 parts of tabular corundum, 10-25 parts of waste ceramic particles, 10-25 parts of waste air brick particles, 20-40 parts of fused magnesia-alumina spinel, 1-10 parts of white corundum, 1-10 parts of alpha alumina micropowder, 5-7 parts of pure calcium aluminate cement, 1-5 parts of chromium oxide, 0.05-0.15 part of organic fiber, 0.1-1 part of water reducing agent and 0.01-0.1 part of metal aluminum powder.
Preferably, the plate-shaped corundum comprises the following components in parts by weight:
5-15 parts of tabular corundum with the grain diameter of 3-5mm and 15-25 parts of tabular corundum with the grain diameter of 1-3 mm;
al in the plate-shaped corundum2O3The content of (B) is more than 99 wt%.
The plate-shaped corundum particles with two particle sizes are matched to form 1-5mm continuous gradation. According to the material filling rule of unit volume, the gaps among the large-particle close arrangement are filled with the small particles, and the gaps among the small-particle close arrangement are filled with the fine powder. The reasonable continuous gradation is beneficial to reducing the porosity of the material, so that the material is more solid and has stronger comprehensive mechanical property.
Preferably, the waste ceramic particles comprise the following components in parts by mass:
5-10 parts of waste ceramic particles with the particle size of 1-3mm and 10-15 parts of waste ceramic particles with the particle size of 0-1 mm;
al in the waste ceramic particles2O3The content of (B) is more than 94 wt%.
Preferably, the waste air brick particles comprise the following components in parts by weight:
5-10 parts of waste air brick particles with the particle size of 1-3mm and 10-15 parts of waste air brick particles with the particle size of 0-1 mm;
al in the waste air brick particles2O3Is greater than 92 wt%.
Preferably, the fused magnesia-alumina spinel comprises the following components in parts by weight:
15-25 parts of electric melting magnesia-alumina spinel with the grain diameter of 0.083-1mm and 5-15 parts of electric melting magnesia-alumina spinel with the grain diameter of 0.044-0.074 mm;
the grain size of the white corundum is 0.074-0.083 mm; al in the white corundum2O3Is greater than 99 wt%;
the grain diameter of the alpha alumina micro powder is 1.5-2.1 μm; al in the alpha alumina micro powder2O3Is greater than 99 wt%;
al in the pure calcium aluminate cement2O3Is greater than 70 wt%;
the grain diameter of the chromic oxide is 0.074-0.083 mm;
the particle size of the metal aluminum powder is 0.074-0.083 mm.
The fused magnesia-alumina spinel fine powder and the white corundum fine powder can be matched with aggregate to reduce the porosity of the combined material and improve the mechanical strength of the combined material.
Preferably, the organic fiber is an ultrahigh molecular weight polyethylene fiber, also called high-strength high-modulus polyethylene fiber, which is a fiber with the highest specific strength and specific modulus in the world at present, and a fiber spun from polyethylene with a molecular weight of 100-500 ten thousand.
The water reducing agent is a mixture of KF21 (the manufacturer is Lekete (Chongqing) chemical product Co., Ltd.) and WS31 (the manufacturer is Lekete (Chongqing) chemical product Co., Ltd.) according to a mass ratio of 2: 3. Through a large number of experimental trials, the water reducing agent with the type KF21 and the water reducing agent with the type WS31 are mixed according to the proportion, so that the water reducing agent is more efficient to the ladle upper nozzle castable system, and the mixing water consumption can be reduced to the maximum.
The invention also provides a ladle upper nozzle prefabricated part which is prepared by adopting the ladle upper nozzle castable.
In a further aspect, the present invention provides a method for preparing the above ladle nozzle preform, comprising the steps of:
mixing the preparation raw materials of the ladle upper nozzle castable with water to obtain a mixture;
forming the mixture to obtain a forming material;
and curing and baking the molding material to obtain the ladle upper nozzle prefabricated part.
Preferably, the curing temperature is 60-80 ℃, and the curing time is 5-8 h;
the baking temperature is 250 ℃, and the baking time is 24 h.
Compared with the prior art, the invention has the following beneficial effects:
1. the ladle upper nozzle castable provided by the invention adopts the plate-shaped corundum, the waste ceramic particles and the waste air brick particles as aggregates, and after the plate-shaped corundum, the waste ceramic particles and the waste air brick particles with irregular shapes are mixed, the particles are mutually occluded, so that the bending strength and the compressive strength of the composition are far higher than those of any single particle combination, and the obtained ladle upper nozzle castable is high in bending strength and compressive strength and long in service life through the blending of other components in the raw materials and the interaction among the components, so that the replacement frequency of an upper nozzle in a ladle service is reduced, and the influence on the production of a steel mill can be reduced to the greatest extent on the premise of ensuring safety. Wherein the waste ceramic particles are recycled high-temperature-resistant ceramics such as industrial crucibles, thermal barrier coatings and the like, and are obtained by crushing, impurity removal and screening. The waste air brick particles are recycled residual air brick materials of off-line steel ladles in the field, and are obtained after crushing, impurity removal and screening, the air brick core is a functional material with the worst working environment in the steel ladles and is a bridge for contacting high-temperature molten steel with room-temperature gas, the overall thermal shock resistance and erosion resistance of the air brick core are high in requirement, and the air brick core is added into the material in a proper proportion, so that the erosion resistance of the molten steel can be enhanced to a certain extent, the erosion degree of the molten steel is reduced, and the service life is prolonged. The invention adopts the waste ceramic particles and the waste air brick particles as raw materials, fully utilizes waste resources, and has important significance for the development of circular economy and the reduction of the production cost of refractory materials.
2. According to the ladle upper nozzle castable, the grain size collocation of tabular corundum, waste ceramic particles, waste air brick particles and the like is reasonably regulated, according to the material filling rule of unit volume, gaps among large particles in close arrangement are filled by small particles, and gaps among small particles in close arrangement are filled by fine powder, so that reasonable continuous grading is beneficial to reducing the material porosity, the material is more compact, and the comprehensive mechanical property is stronger.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The castable for the upper nozzle of the ladle described in the embodiment is prepared from the following raw materials in parts by mass:
10 parts of tabular corundum with the particle size of 3-5mm, 20 parts of tabular corundum with the particle size of 1-3mm, 5 parts of waste ceramic particles with the particle size of 1-3mm, 10 parts of waste ceramic particles with the particle size of 0-1mm, 5 parts of waste air brick particles with the particle size of 1-3mm, 10 parts of waste air brick particles with the particle size of 0-1mm, 10 parts of fused magnesia-alumina spinel with the particle size of 0.083-1mm, 10 parts of fused magnesia-alumina spinel with the particle size of 0.044-0.074mm, 5 parts of white corundum with the particle size of 0.074-0.083mm, 8.55 parts of alpha alumina micropowder with the particle size of 1.5-2.1 mu m, 6 parts of pure calcium aluminate cement, 1 part of chromium oxide with the particle size of 0.074-0.083mm, 0.12 parts of ultrahigh molecular weight polyethylene fiber KF 210.12 parts of aluminum powder, 310.18 parts of water reducer WS and 0.083 0.03 parts of metal with the particle size of 0.074-0.083 mm.
Al in the plate-shaped corundum2O3Is greater than 99 wt%; al in the waste ceramic particles2O3Is greater than 94 wt%; al in the waste air brick particles2O3Is greater than 92 wt%; al in the white corundum2O3The content of (B) is more than 99 wt%.
The preparation method of the ladle nozzle preform comprises the following steps:
mixing the preparation raw materials of the ladle upper nozzle castable in selected parts by weight, then performing dry mixing for 5 minutes, and then adding 5wt% of water for mixing for 3 minutes to obtain a mixture; placing the mixture into a mould for vibration molding (parameters of a vibrator, namely, amplitude is 0.5mm, vibration frequency is 60Hz, power is 3.2Kw, and time is 30 s), discharging air bubbles in the castable until the castable is sufficiently compacted, then performing point vibration for 4-6 hours, and standing to obtain a molding material; placing the molding material in an environment of 80 ℃ and maintaining for 5 hours with a mold to obtain a semi-finished product of the water feeding port; and (3) rapidly heating the semi-finished product to 250 ℃ in a baking kiln, and preserving heat for 25 hours to obtain the ladle upper nozzle prefabricated part.
Example 2
The castable for the upper nozzle of the ladle described in the embodiment is prepared from the following raw materials in parts by mass:
15 parts of tabular corundum with the particle size of 3-5mm, 15 parts of tabular corundum with the particle size of 1-3mm, 5 parts of waste ceramic particles with the particle size of 1-3mm, 10 parts of waste ceramic particles with the particle size of 0-1mm, 5 parts of waste air brick particles with the particle size of 1-3mm, 10 parts of waste air brick particles with the particle size of 0-1mm, 10 parts of fused magnesia-alumina spinel with the particle size of 0.083-1mm, 10 parts of fused magnesia-alumina spinel with the particle size of 0.044-0.074mm, 5 parts of white corundum with the particle size of 0.074-0.083mm, 7.55 parts of alpha alumina micropowder with the particle size of 1.5-2.1 mu m, 7 parts of pure calcium aluminate cement, 2 parts of chromium oxide with the particle size of 0.074-0.083mm, 0.12 parts of ultrahigh molecular weight polyethylene fiber KF 210.12 parts of aluminum powder, 310.18 parts of water reducer WS and 0.083 0.03 parts of metal with the particle size of 0.074-0.083 mm.
Al in the plate-shaped corundum2O3Is greater than 99 wt%; al in the waste ceramic particles2O3Is greater than 94 wt%; al in the waste air brick particles2O3Is greater than 92 wt%; al in the white corundum2O3The content of (B) is more than 99 wt%.
The preparation method of the ladle nozzle preform comprises the following steps:
mixing the preparation raw materials of the ladle upper nozzle castable in selected parts by weight, then performing dry mixing for 5 minutes, and then adding 5wt% of water for mixing for 3 minutes to obtain a mixture; placing the mixture into a mould for vibration molding (parameters of a vibrator, namely, amplitude is 0.5mm, vibration frequency is 60Hz, power is 3.2Kw, and time is 30 s), discharging air bubbles in the castable until the castable is sufficiently compacted, then performing point vibration for 4-6 hours, and standing to obtain a molding material; placing the molding material in an environment of 80 ℃ and maintaining for 5 hours with a mold to obtain a semi-finished product of the water feeding port; and (3) rapidly heating the semi-finished product to 250 ℃ in a baking kiln, and preserving heat for 24 hours to obtain the ladle upper nozzle prefabricated part.
Example 3
The castable for the upper nozzle of the ladle described in the embodiment is prepared from the following raw materials in parts by mass:
10 parts of tabular corundum with the particle size of 3-5mm, 15 parts of tabular corundum with the particle size of 1-3mm, 10 parts of waste ceramic particles with the particle size of 0-1mm, 5 parts of waste air brick particles with the particle size of 1-3mm, 10 parts of waste air brick particles with the particle size of 0-1mm, 10 parts of fused magnesia-alumina spinel with the particle size of 0.083-1mm, 10 parts of fused magnesia-alumina spinel with the particle size of 0.044-0.074mm, 5 parts of white corundum with the particle size of 0.074-0.083mm, 8.45 parts of alpha alumina micropowder with the particle size of 1.5-2.1 mu m, 6 parts of pure calcium aluminate cement, 3 parts of chromium oxide with the particle size of 0.074-0.083mm, 0.12 parts of ultrahigh molecular weight polyethylene fiber KF 210.16 parts of aluminum powder, 310.24 parts of water reducer WS and 0.074-0.083 0.03 mm of metal with the particle size of 0.074-0.083 mm.
Al in the plate-shaped corundum2O3Is greater than 99 wt%; al in the waste ceramic particles2O3Is greater than 94 wt%; al in the waste air brick particles2O3Is greater than 92 wt%; al in the white corundum2O3The content of (B) is more than 99 wt%.
The preparation method of the ladle nozzle preform comprises the following steps:
mixing the preparation raw materials of the ladle upper nozzle castable in selected parts by weight, then performing dry mixing for 5 minutes, and then adding 5wt% of water for mixing for 3 minutes to obtain a mixture; placing the mixture into a mould for vibration molding (parameters of a vibrator, namely, amplitude is 0.5mm, vibration frequency is 60Hz, power is 3.2Kw, and time is 30 s), discharging air bubbles in the castable until the castable is sufficiently compacted, then performing point vibration for 4-6 hours, and standing to obtain a molding material; placing the molding material in an environment of 80 ℃ and maintaining for 5 hours with a mold to obtain a semi-finished product of the water feeding port; and (3) rapidly heating the semi-finished product to 250 ℃ in a baking kiln, and preserving heat for 24 hours to obtain the ladle upper nozzle prefabricated part.
Example 4
The castable for the upper nozzle of the ladle described in the embodiment is prepared from the following raw materials in parts by mass:
5 parts of tabular corundum with the particle size of 3-5mm, 15 parts of tabular corundum with the particle size of 1-3mm, 10 parts of waste ceramic particles with the particle size of 1-3mm, 15 parts of waste ceramic particles with the particle size of 0-1mm, 5 parts of waste air brick particles with the particle size of 1-3mm, 5 parts of waste air brick particles with the particle size of 0-1mm, 15 parts of fused magnesia-alumina spinel with the particle size of 0.083-1mm, 15 parts of fused magnesia-alumina spinel with the particle size of 0.044-0.074mm, 10 parts of white corundum with the particle size of 0.074-0.083mm, 1 part of alpha alumina micropowder with the particle size of 1.5-2.1 mu m, 5 parts of pure calcium aluminate cement, 4 parts of chromium oxide with the particle size of 0.074-0.083mm, 0.05 part of ultrahigh molecular weight polyethylene fiber, 210.4 parts of KF water reducer, 310.6 parts of WS water reducer and 0.01 part of metal with the particle size of 0.074-0.083 mm.
Al in the plate-shaped corundum2O3Is greater than 99 wt%; al in the waste ceramic particles2O3Is greater than 94 wt%; al in the waste air brick particles2O3Is greater than 92 wt%; al in the white corundum2O3The content of (B) is more than 99 wt%.
The method for manufacturing the ladle filler neck preform of this example is the same as that of example 1.
Example 5
The castable for the upper nozzle of the ladle described in the embodiment is prepared from the following raw materials in parts by mass:
15 parts of tabular corundum with the particle size of 3-5mm, 25 parts of tabular corundum with the particle size of 1-3mm, 5 parts of waste ceramic particles with the particle size of 0-1mm, 10 parts of waste air brick particles with the particle size of 1-3mm, 15 parts of waste air brick particles with the particle size of 0-1mm, 25 parts of fused magnesia-alumina spinel with the particle size of 0.083-1mm, 15 parts of fused magnesia-alumina spinel with the particle size of 0.044-0.074mm, 1 part of white corundum with the particle size of 0.074-0.083mm, 10 parts of alpha alumina micropowder with the particle size of 1.5-2.1 mu m, 6 parts of pure calcium aluminate cement, 5 parts of chromium oxide with the particle size of 0.074-0.083mm, 0.15 parts of ultrahigh molecular weight polyethylene fiber, 210.04 parts of KF water reducer, 310.06 parts of WS water reducer and 0.074-0.083mm of metal.
Al in the plate-shaped corundum2O3Is greater than 99 wt%; al in the waste ceramic particles2O3Is greater than 94 wt%; al in the waste air brick particles2O3Is greater than 92 wt%; al in the white corundum2O3The content of (B) is more than 99 wt%.
The method for manufacturing the ladle filler neck preform of this example is the same as that of example 1.
Example 6
The castable for the upper nozzle of the ladle described in the embodiment is prepared from the following raw materials in parts by mass:
5 parts of tabular corundum with the particle size of 3-5mm, 5 parts of tabular corundum with the particle size of 1-3mm, 25 parts of waste ceramic particles with the particle size of 0-1mm, 2 parts of waste air brick particles with the particle size of 1-3mm, 3 parts of waste air brick particles with the particle size of 0-1mm, 5 parts of fused magnesia-alumina spinel with the particle size of 0.083-1mm, 5 parts of fused magnesia-alumina spinel with the particle size of 0.044-0.074mm, 20 parts of white corundum with the particle size of 0.074-0.083mm, 0.5 part of alpha alumina micropowder with the particle size of 1.5-2.1 mu m, 10 parts of pure calcium aluminate cement, 0.5 part of chromium oxide with the particle size of 0.074-0.083mm, 0.3 part of ultrahigh molecular weight polyethylene fiber KF 210.02 part, water reducing agent, 310.03 parts of water reducing agent WS, and 0.074-0.083mm of metal with the particle size of 0.083 mm.
Al in the plate-shaped corundum2O3Is greater than 99 wt%; al in the waste ceramic particles2O3Is greater than 94 wt%; al in the waste air brick particles2O3Is greater than 92 wt%; al in the white corundum2O3The content of (B) is more than 99 wt%.
The method for manufacturing the ladle filler neck preform of this example is the same as that of example 1.
Example 7
The castable for the upper nozzle of the ladle described in the embodiment is prepared from the following raw materials in parts by mass:
30 parts of tabular corundum with the particle size of 3-5mm, 30 parts of tabular corundum with the particle size of 1-3mm, 2 parts of waste ceramic particles with the particle size of 1-3mm, 3 parts of waste ceramic particles with the particle size of 0-1mm, 25 parts of waste air brick particles with the particle size of 1-3mm, 25 parts of waste air brick particles with the particle size of 0-1mm, 30 parts of fused magnesia-alumina spinel with the particle size of 0.083-1mm, 30 parts of fused magnesia-alumina spinel with the particle size of 0.044-0.074mm, 0.5 part of white corundum with the particle size of 0.074-0.083mm, 20 parts of alpha alumina micropowder with the particle size of 1.5-2.1 mu m, 1 part of pure calcium aluminate cement, 10 parts of chromium oxide with the particle size of 0.074-0.083mm, 0.01 part of polyethylene fiber with the molecular weight, 210.8 parts of aluminum powder, 311.2 parts of water reducing agent WS and 0.005 part of metal with the particle size of 0.074-0.083 mm.
Al in the plate-shaped corundum2O3Is greater than 99 wt%; al in the waste ceramic particles2O3Is greater than 94 wt%; al in the waste air brick particles2O3Is greater than 92 wt%; al in the white corundum2O3The content of (B) is more than 99 wt%.
The method for manufacturing the ladle filler neck preform of this example is the same as that of example 1.
Example 8
The ladle filler castable of the embodiment is prepared from the same raw materials as those in the embodiment 1, except that 210.15 parts of water reducing agent KF and 310.15 parts of water reducing agent WS are added.
Comparative example 1
The ladle upper nozzle castable of the comparative example is prepared from the following raw materials in parts by mass:
10 parts of tabular corundum with the particle size of 3-5mm, 20 parts of tabular corundum with the particle size of 1-3mm, 10 parts of waste air brick particles with the particle size of 1-3mm, 20 parts of waste air brick particles with the particle size of 0-1mm, 10 parts of electric fused magnesia-alumina spinel with the particle size of 0.083-1mm, 10 parts of electric fused magnesia-alumina spinel with the particle size of 0.044-0.074mm, 5 parts of white corundum with the particle size of 0.074-0.083mm, 8.55 parts of alpha alumina micropowder with the particle size of 1.5-2.1 mu m, 6 parts of pure calcium aluminate cement, 1 part of chromium oxide with the particle size of 0.074-0.083mm, 0.12 part of ultrahigh molecular weight polyethylene fiber, KF 210.12 part, 310.18 parts of water reducing agent WS 310.18 part and 0.03 part of metal aluminum powder with the particle size of 0.074-0.083 mm.
Al in the plate-shaped corundum2O3Is greater than 99 wt%; al in the waste air brick particles2O3Is greater than 92 wt%; al in the white corundum2O3The content of (B) is more than 99 wt%.
The preparation method of the ladle nozzle preform comprises the following steps:
mixing the preparation raw materials of the ladle upper nozzle castable in selected parts by weight, then performing dry mixing for 5 minutes, and then adding 5wt% of water for mixing for 3 minutes to obtain a mixture; placing the mixture into a mould for vibration molding (parameters of a vibrator, namely, amplitude is 0.5mm, vibration frequency is 60Hz, power is 3.2Kw, and time is 30 s), discharging air bubbles in the castable until the castable is sufficiently compacted, then performing point vibration for 4-6 hours, and standing to obtain a molding material; placing the molding material in an environment of 80 ℃ and maintaining for 5 hours with a mold to obtain a semi-finished product of the water feeding port; and (3) rapidly heating the semi-finished product to 250 ℃ in a baking kiln, and preserving heat for 24 hours to obtain the ladle upper nozzle prefabricated part.
Comparative example 2
The ladle upper nozzle castable of the comparative example is prepared from the following raw materials in parts by mass:
10 parts of tabular corundum with the particle size of 3-5mm, 20 parts of tabular corundum with the particle size of 1-3mm, 10 parts of waste ceramic particles with the particle size of 1-3mm, 20 parts of waste ceramic particles with the particle size of 0-1mm, 10 parts of fused magnesia-alumina spinel with the particle size of 0.083-1mm, 10 parts of fused magnesia-alumina spinel with the particle size of 0.044-0.074mm, 5 parts of white corundum with the particle size of 0.074-0.083mm, 8.55 parts of alpha alumina micropowder with the particle size of 1.5-2.1 mu m, 6 parts of pure calcium aluminate cement, 1 part of chromium oxide with the particle size of 0.074-0.083mm, 0.12 part of high molecular weight fiber, 0. 210.12 part of polyethylene water reducer KF, 310.18 parts of water reducer and 0.03 part of metal aluminum powder with the particle size of 0.074-0.083 mm.
Al in the plate-shaped corundum2O3Is greater than 99 wt%; al in the waste ceramic particles2O3Is greater than 94 wt%; al in the white corundum2O3The content of (B) is more than 99 wt%.
The preparation method of the ladle nozzle preform comprises the following steps:
mixing the preparation raw materials of the ladle upper nozzle castable in selected parts by weight, then performing dry mixing for 5 minutes, and then adding 5wt% of water for mixing for 3 minutes to obtain a mixture; placing the mixture into a mould for vibration molding (parameters of a vibrator, namely, amplitude is 0.5mm, vibration frequency is 60Hz, power is 3.2Kw, and time is 30 s), discharging air bubbles in the castable until the castable is sufficiently compacted, then performing point vibration for 4-6 hours, and standing to obtain a molding material; placing the molding material in an environment of 80 ℃ and maintaining for 5 hours with a mold to obtain a semi-finished product of the water feeding port; and (3) rapidly heating the semi-finished product to 250 ℃ in a baking kiln, and preserving heat for 24 hours to obtain the ladle upper nozzle prefabricated part.
Steel ladle upper nozzle prefabricated part performance test
The bending strength, compressive strength, life, etc. of the ladle filler neck preforms of the above examples and comparative examples were measured to obtain the results as shown in table 1 below. Compared with the castable for the ladle upper nozzle in the embodiment 1, the castable for the ladle upper nozzle in the comparative example 1 is different from the castable for the ladle upper nozzle in the embodiment 1 in that the castable does not contain waste ceramic particles, and the flowing property, the breaking strength, the compressive strength, the yield and the service life of the castable are reduced to different degrees, wherein the breaking strength, the compressive strength, the yield and the service life of the castable are reduced particularly obviously; compared with the castable for the upper nozzle of the ladle in the comparative example 2, the castable for the upper nozzle of the ladle in the comparative example 1 is different from the castable for the upper nozzle of the ladle in the embodiment 1 in that the castable does not contain waste air brick particles, and the flowing property, the breaking strength, the compressive strength, the yield and the service life of the castable are reduced to different degrees, wherein the flowing property and the service life of the castable are reduced particularly obviously; the ladle upper nozzle castable of the embodiments 1 to 8 has better breaking strength, compressive strength, yield and service life; among them, examples 1 to 5 are more preferable examples, and the flexural strength, compressive strength, yield and life are more excellent than examples 6 and 7, and example 1 is more excellent in the ratio of the two water reducing agents and more effective than example 8.
TABLE 1
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims (10)

1. The castable for the upper nozzle of the ladle is characterized by comprising the following preparation raw materials in parts by mass:
10-60 parts of tabular corundum, 5-50 parts of waste ceramic particles, 5-50 parts of waste air brick particles, 10-60 parts of fused magnesia-alumina spinel, 0.5-20 parts of white corundum, 0.5-20 parts of alpha alumina micropowder, 1-10 parts of pure calcium aluminate cement, 0.5-10 parts of chromium oxide, 0.01-0.3 part of organic fiber, 0.05-2 parts of water reducing agent and 0.005-0.2 part of metal aluminum powder.
2. The ladle upper nozzle castable according to claim 1, wherein the preparation raw materials comprise the following components in parts by weight:
20-40 parts of tabular corundum, 10-25 parts of waste ceramic particles, 10-25 parts of waste air brick particles, 20-40 parts of fused magnesia-alumina spinel, 1-10 parts of white corundum, 1-10 parts of alpha alumina micropowder, 5-7 parts of pure calcium aluminate cement, 1-5 parts of chromium oxide, 0.05-0.15 part of organic fiber, 0.1-1 part of water reducing agent and 0.01-0.1 part of metal aluminum powder.
3. The ladle upper nozzle castable according to claim 2, wherein the plate-shaped corundum comprises the following components in parts by mass:
5-15 parts of tabular corundum with the grain diameter of 3-5mm and 15-25 parts of tabular corundum with the grain diameter of 1-3 mm;
al in the plate-shaped corundum2O3The content of (B) is more than 99 wt%.
4. The ladle upper nozzle castable according to claim 2, wherein the waste ceramic particles comprise the following components in parts by mass:
5-10 parts of waste ceramic particles with the particle size of 1-3mm and 5-15 parts of waste ceramic particles with the particle size of 0-1 mm;
al in the waste ceramic particles2O3The content of (B) is more than 94 wt%.
5. The ladle upper nozzle castable according to claim 2, wherein the waste air brick particles comprise the following components in parts by mass:
5-10 parts of waste air brick particles with the particle size of 1-3mm and 5-15 parts of waste air brick particles with the particle size of 0-1 mm;
al in the waste air brick particles2O3Is greater than 92 wt%.
6. The ladle top nozzle castable according to claim 2,
the fused magnesia-alumina spinel comprises the following components in parts by weight:
15-25 parts of electric melting magnesia-alumina spinel with the grain diameter of 0.083-1mm and 5-15 parts of electric melting magnesia-alumina spinel with the grain diameter of 0.044-0.074 mm;
the grain size of the white corundum is 0.074-0.083 mm; al in the white corundum2O3Is greater than 99 wt%;
the grain diameter of the alpha alumina micro powder is 1.5-2.1 μm; al in the alpha alumina micro powder2O3Is greater than 99 wt%;
al in the pure calcium aluminate cement2O3Is greater than 70 wt%;
the grain diameter of the chromic oxide is 0.074-0.083 mm;
the particle size of the metal aluminum powder is 0.074-0.083 mm.
7. The ladle upper nozzle castable according to claim 2, wherein:
the organic fiber is ultra-high molecular weight polyethylene fiber;
the water reducing agent is a mixture of KF21 and WS31 according to the mass ratio of 2: 3.
8. A ladle nozzle preform produced using the ladle nozzle castable according to any one of claims 1 to 7.
9. A method of making the ladle nozzle preform of claim 8, comprising the steps of:
mixing the preparation raw materials of the ladle upper nozzle castable with water to obtain a mixture;
forming the mixture to obtain a forming material;
and curing and baking the molding material to obtain the ladle upper nozzle prefabricated part.
10. The method of making a ladle nozzle preform according to claim 9, wherein:
the curing temperature is 60-80 ℃, and the curing time is 5-8 h;
the baking temperature is 250 ℃, and the baking time is 24 h.
CN202110229881.4A 2021-03-02 2021-03-02 Ladle upper nozzle castable, prefabricated part and preparation method thereof Pending CN112592163A (en)

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