CN116143501B - Mechanical pressing tundish hanging plate and preparation method thereof - Google Patents

Mechanical pressing tundish hanging plate and preparation method thereof Download PDF

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CN116143501B
CN116143501B CN202310162379.5A CN202310162379A CN116143501B CN 116143501 B CN116143501 B CN 116143501B CN 202310162379 A CN202310162379 A CN 202310162379A CN 116143501 B CN116143501 B CN 116143501B
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tundish
equal
hanging plate
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percent
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CN116143501A (en
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黄建坤
苗正
马伟平
杨连弟
张琳
王文寰
王蕊
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Hebei Guoliang New Material Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/03—Shaped 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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
    • C04B35/04—Shaped 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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
    • C04B35/043—Refractories from grain sized mixtures
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    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/10—Shaped 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
    • C04B35/101—Refractories from grain sized mixtures
    • C04B35/103—Refractories from grain sized mixtures containing non-oxide refractory materials, e.g. carbon
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    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/62204—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products using waste materials or refuse
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
    • C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
    • C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
    • C—CHEMISTRY; METALLURGY
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    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/30—Constituents and secondary phases not being of a fibrous nature
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    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

The invention provides a mechanically pressed tundish hanging plate and a preparation method thereof, wherein the preparation raw materials of the tundish hanging plate comprise main materials and binding agents, and the main materials comprise the following components: 42-50 wt% of regenerated reclaimed materials, 10-19wt% of fused magnesia particles, 0-19wt% of fused magnesia fine powder, 10-19wt% of white corundum particles, 0-19wt% of white corundum fine powder, 3-6wt% of crystalline flake graphite, 0.5-1.5 wt% of calcium aluminate cement, 0.5-1.5 wt% of strength enhancer and 0.5-1.5 wt% of antioxidant; the regenerated reclaimed material is at least one selected from magnesia-alumina-carbon regenerated reclaimed material, alumina-magnesia-carbon regenerated reclaimed material and alumina-carbon regenerated reclaimed material; the bonding agent is liquid phenolic resin, and the weight of the bonding agent accounts for 3-4% of the weight of the main material. According to the invention, through the optimization of the formula, the raw materials are mutually matched to complement each other, so that the strength of a wet blank can be effectively improved, the mechanical pressing preparation of the tundish hanging plate is realized, and the tundish hanging plate with large and thin size, good anti-scouring performance, high-temperature flexural strength and molten steel erosion resistance is obtained.

Description

Mechanical pressing tundish hanging plate and preparation method thereof
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a mechanically-pressed tundish hanging plate and a preparation method thereof.
Background
The tundish is a refractory material container used in steelmaking, is an intermediate link of the steelmaking production flow, is a joint point from intermittent operation to continuous operation, firstly receives molten steel poured from the ladle, and then distributes the molten steel into each crystallizer by the tundish. When receiving molten steel in a ladle, the tundish is subjected to larger impact, and the poured molten steel is in a turbulent state in the tundish, so that the defects of bubble inclusion and the like of a casting billet are caused. Therefore, the flow stabilizer is used at the falling part of molten steel to resist the impact of molten steel and stabilize the molten steel. At the outlet of the flow stabilizer, the working layer of the tundish is also flushed by molten steel flow, and the erosion is extremely fast, so that the service life of the tundish is influenced. At the outlet of the flow stabilizer for molten steel, the hanging plate is additionally arranged on the working layer of the tundish, so that the anti-scouring performance of the part is improved, and the service life of the tundish is prolonged.
The thickness of the working layer of the tundish is about 100mm, the hanging plate of the tundish needs to be buried in the working layer and is hung by the working layer, the thickness of the hanging plate is required to be not more than 40mm, meanwhile, the hanging plate has corresponding requirements on the length and the width, and the general design size of the length and the width is 900 mm. The large-area thin-size hanging plate adopts a casting molding mode at present, and has low casting molding efficiency and high labor intensity.
Disclosure of Invention
Based on the above, the invention aims to provide a tundish hanging plate and a preparation method thereof. The tundish hanging plate is formed by adopting a machine press, and has the advantages of high forming efficiency, large bulk density, low porosity, high strength and excellent molten steel scouring resistance.
In order to achieve the above purpose, the present invention adopts the following technical scheme.
The preparation raw materials of the tundish hanging plate comprise main materials and binding agents, wherein the main materials comprise the following components: 42-50 wt% of regenerated reclaimed materials, 10-19wt% of fused magnesia particles, 0-19wt% of fused magnesia fine powder, 10-19wt% of white corundum particles, 0-19wt% of white corundum fine powder, 3-6wt% of crystalline flake graphite, 0.5-1.5 wt% of calcium aluminate cement, 0.5-1.5 wt% of strength enhancer and 0.5-1.5 wt% of antioxidant; the regenerated reclaimed material is at least one selected from magnesia-alumina-carbon regenerated reclaimed material, alumina-magnesia-carbon regenerated reclaimed material and alumina-carbon regenerated reclaimed material;
the bonding agent is liquid phenolic resin, and the weight of the bonding agent accounts for 3-4% of the weight of the main material.
In some embodiments, the primary ingredients include the following components: 45-48 wt% of recycled materials, 10-19wt% of fused magnesia particles, 5-19wt% of fused magnesia fine powder, 10-19wt% of white corundum particles, 5-19wt% of white corundum fine powder, 3-6wt% of crystalline flake graphite, 0.8-1.2 wt% of calcium aluminate cement, 0.8-1.2 wt% of strength enhancer and 0.8-1.2 wt% of antioxidant.
In some embodiments, the magnesium aluminum carbon regeneration recycle comprises at least one of 5-3mm and 3-1mm particles; the percentage content of MgO in the magnesium aluminum carbon reclaimed material is more than or equal to 68 percent, al 2 O 3 The percentage content of (2) is less than or equal to 12 percent; and/or the number of the groups of groups,
the aluminum-magnesium-carbon regenerated reclaimed material comprises at least one of 5-3mm and 3-1mm particles; al in the aluminum-magnesium-carbon reclaimed material 2 O 3 The percentage content of MgO is more than or equal to 65 percent, and the percentage content of MgO is less than or equal to 16 percent; and/or the number of the groups of groups,
the aluminum carbon regeneration reclaimed material comprises at least one of 5-3mm and 3-1mm particles; al in the aluminum carbon regeneration reclaimed material 2 O 3 The percentage content of C is more than or equal to 85 percent and the percentage content of C is less than or equal to 4 percent.
In some embodiments, the granularity of the fused magnesia particles is 1-0mm, and the percentage content of MgO is more than or equal to 96 percent; and/or the granularity of the fused magnesia fine powder is 180 meshes, and the percentage content of MgO is more than or equal to 96 percent.
In some embodiments, the white corundum particles have a particle size of 1-0mm, al 2 O 3 The percentage content of (2) is more than or equal to 99 percent; and/or the granularity of the white corundum fine powder is 200 meshes, al 2 O 3 The percentage content of (2) is more than or equal to 99 percent.
In some embodiments, the calcium aluminate cement contains Al 2 O 3 The percentage content of (2) is more than or equal to 70 percent; and/or, the particle size of the flake graphite is 100 meshes, and the percentage content of carbon is 94%; and/or the antioxidant is metal aluminum powder, and the percentage content of aluminum is more than or equal to 99%.
In some embodiments, the strength enhancer is yellow dextrin.
In some embodiments, the tundish deck gauge is 900mm (length) x 400mm (width) x 40mm (thickness).
The invention also provides a preparation method of the tundish hanging plate, which comprises the following steps:
(1) Uniformly mixing the white corundum particles, the fused magnesia particles, the white corundum fine powder, the fused magnesia fine powder, the calcium aluminate cement, the strength enhancer and the antioxidant to obtain a premix;
(2) Adding the regenerated reclaimed materials into a mixing machine for mixing, then sequentially adding the flake graphite, the premix and the binding agent, mixing and discharging to obtain a mixture;
(3) Performing mechanical press forming on the mixture to obtain a formed green brick;
(4) And drying the formed green bricks to prepare the tundish hanging plate.
In some embodiments, the step (3) adopts 1600t electric screw press to perform striking molding, the striking times are more than 20, and the density of the molded green brick is higher than that of the molded green brick>2.9g/cm 3 。
In some embodiments, the drying temperature in step (4) is from room temperature to 200 ℃.
According to the invention, a tundish hanging plate is obtained through optimization: the recycled material is used as aggregate, and the waste material is recycled, so that the product cost is reduced; the application of the strength enhancer yellow dextrin can provide wet blank strength, is favorable for the blank to be well-formed and reduces damage; the strength of the wet blank in the transportation process is enhanced by hydration of the calcium aluminate cement, and the strength of the wet blank can be further enhanced by compounding the yellow dextrin and the calcium aluminate cement according to a proper proportion; the antioxidant can improve the oxidation resistance of the product and improve the heat breaking strength; carbon is introduced, so that the wettability of molten steel is reduced, and the thermal shock resistance is improved. Through the optimization of the formula, the raw materials are mutually matched and complement each other, so that the mechanical pressing preparation of the tundish hanging plate is realized, and the large and thin hanging plate with 900mm x 400mm x 40mm is produced.
Detailed Description
The experimental methods of the present invention, in which specific conditions are not specified in the following examples, are generally conducted under conventional conditions or under conditions recommended by the manufacturer. The various chemicals commonly used in the examples are commercially available.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The terms "comprising" and "having" and any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, apparatus, article, or device that comprises a list of steps is not limited to the elements or modules listed but may alternatively include additional steps not listed or inherent to such process, method, article, or device.
In the present invention, the term "plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.
The following description is made with reference to specific embodiments.
Example 1
The embodiment provides a package link plate in middle of machine pressure, its batching constitution is:
16Kg of 5-3mm magnesia alumina carbon reclaimed materials, 30Kg of 3-1mm magnesia alumina carbon reclaimed materials, 19Kg of 1-0mm fused magnesia particles, 19Kg of 180-mesh fused magnesia fine powder, 10Kg of 1-0mm white corundum particles, 3Kg of 100-mesh flake graphite, 1Kg of calcium aluminate cement, 1Kg of strength enhancer yellow dextrin, 1Kg of antioxidant aluminum powder and 3Kg of liquid phenolic resin binder.
The percentage content of MgO in the magnesium aluminum carbon reclaimed material is more than or equal to 68 percent, al 2 O 3 The percentage content of (2) is less than or equal to 12 percent; the percentage content of MgO in the fused magnesia is more than or equal to 96 percent; the percentage content of MgO in the fused magnesia fine powder is more than or equal to 96 percent; al in the white corundum particles 2 O 3 The percentage content of (2) is more than or equal to 99 percent; al in the calcium aluminate cement 2 O 3 The percentage content of (2) is more than or equal to 70 percent; the percentage content of the crystalline flake graphite is 94%; in the aluminum powderThe percentage content of aluminum is more than or equal to 99 percent.
The preparation method of the mechanically pressed tundish hanging plate comprises the following steps:
(1) Uniformly mixing white corundum particles, magnesia fine powder, calcium aluminate cement, a strength enhancer and an antioxidant to obtain a premix, wherein the mixing time is more than or equal to 15min;
(2) Adding 5-3mm and 3-1mm magnesia-alumina carbon reclaimed materials into a mixing machine for mixing for 3min, then sequentially adding flake graphite, premix and liquid phenolic resin, and discharging after mixing;
(3) Carrying out mechanical press molding on the mixed material after the mixing to obtain a molded green brick;
(4) And drying the formed green bricks by a drying kiln at the temperature of between normal temperature and 200 ℃ to prepare the mechanically pressed tundish hanging plate.
In the step (3), a 1600t electric screw press is adopted for striking molding, and the density of the molded green bricks is higher than 20 striking times>2.9g/cm 3 。
The specification of the mechanically pressed tundish hanging plate is 900mm (length) by 400mm (width) by 40mm (thickness).
Example 2
The embodiment provides a package link plate in middle of machine pressure, its batching constitution is:
16Kg of recycled materials of 5-3mm aluminum magnesium carbon, 30Kg of recycled materials of 3-1mm magnesium aluminum carbon, 10Kg of 1-0mm fused magnesia particles, 19Kg of 1-0mm white corundum particles, 19Kg of 200-mesh white corundum fine powder, 3Kg of 100-mesh flake graphite, 1Kg of calcium aluminate cement, 1Kg of strength enhancer yellow dextrin, 1Kg of antioxidant aluminum powder and 3Kg of liquid phenolic resin binder.
Al in the aluminum-magnesium-carbon reclaimed material 2 O 3 The percentage content of MgO is more than or equal to 65 percent, and the percentage content of MgO is less than or equal to 16 percent; the percentage content of MgO in the magnesium aluminum carbon reclaimed material is more than or equal to 68 percent, al 2 O 3 The percentage content of (2) is less than or equal to 12 percent; the percentage content of MgO in the fused magnesia particles is more than or equal to 96 percent; al in the white corundum fine powder 2 O 3 The percentage content of (2) is more than or equal to 99 percent; al in the calcium aluminate cement 2 O 3 The percentage content of (2) is more than or equal to 70 percent; the percentage content of carbon in the flake graphite is 94 percentThe method comprises the steps of carrying out a first treatment on the surface of the The percentage content of aluminum in the aluminum powder is more than or equal to 99 percent.
The preparation method of the mechanically pressed tundish hanging plate comprises the following steps:
(1) Uniformly mixing white corundum particles, magnesia particles, white corundum fine powder, calcium aluminate cement, a strength enhancer and an antioxidant to obtain a premix, wherein the mixing time is more than or equal to 15min;
(2) Adding 5-3mm and 3-1mm magnesia-alumina carbon reclaimed materials into a mixing machine for mixing for 3min, then sequentially adding flake graphite, premix and liquid phenolic resin, and discharging after mixing;
(3) Carrying out mechanical press molding on the mixed material after the mixing to obtain a molded green brick;
(4) And drying the formed green bricks by a drying kiln at the temperature of between normal temperature and 200 ℃ to prepare the mechanically pressed tundish hanging plate.
In the step (3), a 1600t electric screw press is adopted for striking molding, and the density of the molded green bricks is higher than 20 striking times>2.9g/cm 3 。
The specification of the mechanically pressed tundish hanging plate is 900mm (length) by 400mm (width) by 40mm (thickness).
Example 3
The embodiment provides a package link plate in middle of machine pressure, its batching constitution is:
16Kg of 5-3mm aluminum carbon reclaimed materials, 30Kg of 3-1mm aluminum carbon reclaimed materials, 10Kg of 1-0mm fused magnesia particles, 5Kg of 180-mesh fused magnesia fine powder, 19Kg of 1-0mm white corundum particles, 11Kg of 200-mesh white corundum fine powder, 6Kg of 100-mesh flake graphite, 1Kg of calcium aluminate cement, 1Kg of strength enhancer yellow dextrin, 1Kg of antioxidant aluminum powder and 3Kg of liquid phenolic resin bonding agent.
Al in the aluminum carbon regeneration reclaimed material 2 O 3 The percentage content of C is more than or equal to 85 percent, and the percentage content of C is less than or equal to 4 percent; the percentage content of MgO in the fused magnesia particles is more than or equal to 96 percent; the percentage content of MgO in the fused magnesia fine powder is more than or equal to 96 percent; al in the white corundum particles 2 O 3 The percentage content of (2) is more than or equal to 99 percent; al in the white corundum fine powder 2 O 3 The percentage content of (2) is more than or equal to 99 percent; al in the calcium aluminate cement 2 O 3 Comprises the following components in percentageThe amount is more than or equal to 70 percent; the percentage content of carbon in the flake graphite is 94%; the percentage content of aluminum in the aluminum powder is more than or equal to 99 percent.
The preparation method of the mechanically pressed tundish hanging plate comprises the following steps:
(1) Uniformly mixing white corundum particles, magnesia fine powder, white corundum fine powder, calcium aluminate cement, a strength enhancer and an antioxidant to obtain a premix, wherein the mixing time is more than or equal to 15min;
(2) Adding the recycled materials of the aluminum carbon regeneration of 5-3mm and 3-1mm into a mixing machine, mixing for 3min, sequentially adding flake graphite, premix and liquid phenolic resin, mixing, and discharging;
(3) Carrying out mechanical press molding on the mixed material after the mixing to obtain a molded green brick;
(4) And drying the formed green bricks by a drying kiln at the temperature of between normal temperature and 200 ℃ to prepare the mechanically pressed tundish hanging plate.
In the step (3), a 1600t electric screw press is adopted for striking molding, and the density of the molded green bricks is higher than 20 striking times>2.9g/cm 3 。
The specification of the mechanically pressed tundish hanging plate is 900mm (length) by 400mm (width) by 40mm (thickness).
Comparative example 1
This comparative example provides a tundish hanging plate, the ingredients of which are the same as those of example 1 except that the strength enhancer yellow dextrin is replaced by Guangxi white mud, and the ingredients are as follows:
16Kg of 5-3mm magnesia alumina carbon reclaimed materials, 30Kg of 3-1mm magnesia alumina carbon reclaimed materials, 19Kg of 1-0mm fused magnesia particles, 19Kg of 180-mesh fused magnesia fine powder, 10Kg of 1-0mm white corundum particles, 3Kg of 100-mesh flake graphite, 1Kg of calcium aluminate cement, 1Kg of Guangxi white mud, 1Kg of antioxidant aluminum powder and 3Kg of liquid phenolic resin bonding agent.
The percentage content of MgO in the magnesium aluminum carbon reclaimed material is more than or equal to 68 percent, al 2 O 3 The percentage content of (2) is less than or equal to 12 percent; the percentage content of MgO in the fused magnesia is more than or equal to 96 percent; the percentage content of MgO in the fused magnesia fine powder is more than or equal to 96 percent; al in the white corundum particles 2 O 3 The percentage content of (2) is more than or equal to 99 percent;al in the calcium aluminate cement 2 O 3 The percentage content of (2) is more than or equal to 70 percent; the percentage content of the crystalline flake graphite is 94%; the percentage content of aluminum in the aluminum powder is more than or equal to 99 percent.
The preparation method of the tundish hanging plate comprises the following steps:
(1) Uniformly mixing white corundum particles, magnesia fine powder, calcium aluminate cement, guangxi white mud and an antioxidant to obtain a premix, wherein the mixing time is more than or equal to 15min;
(2) Adding 5-3mm and 3-1mm magnesia-alumina carbon reclaimed materials into a mixing machine for mixing for 3min, then sequentially adding flake graphite, premix and liquid phenolic resin, and discharging after mixing;
(3) Carrying out mechanical press molding on the mixed material after the mixing to obtain a molded green brick;
(4) And drying the formed green bricks by a drying kiln at the temperature of between normal temperature and 200 ℃ to prepare the mechanically pressed tundish hanging plate.
In the step (3), a 1600t electric screw press is adopted for striking molding, and the density of the molded green bricks is higher than 20 striking times>2.9g/cm 3 。
The specification of the mechanically pressed tundish hanging plate is 900mm (length) by 400mm (width) by 40mm (thickness).
Comparative example 2
This comparative example provides a tundish hanging plate, the ingredients of which are the same as those of example 1 except that the calcium aluminate cement is replaced by alumina micropowder, and the concrete steps are as follows:
16Kg of 5-3mm magnesia alumina carbon reclaimed materials, 30Kg of 3-1mm magnesia alumina carbon reclaimed materials, 19Kg of 1-0mm fused magnesia particles, 19Kg of 180-mesh fused magnesia fine powder, 10Kg of 1-0mm white corundum particles, 3Kg of 100-mesh flake graphite, 1Kg of alumina micro powder, 1Kg of strength enhancer yellow dextrin, 1Kg of antioxidant aluminum powder and 3Kg of liquid phenolic resin bonding agent.
The percentage content of MgO in the magnesium aluminum carbon reclaimed material is more than or equal to 68 percent, al 2 O 3 The percentage content of (2) is less than or equal to 12 percent; the percentage content of MgO in the fused magnesia is more than or equal to 96 percent; the percentage content of MgO in the fused magnesia fine powder is more than or equal to 96 percent; al in the white corundum particles 2 O 3 The percentage content of (2) is more than or equal to 99 percent; the percentage content of the crystalline flake graphite is 94%; the percentage content of aluminum in the aluminum powder is more than or equal to 99 percent.
The preparation method of the mechanically pressed tundish hanging plate comprises the following steps:
(1) Uniformly mixing white corundum particles, magnesia fine powder, alumina micropowder, strength enhancer and antioxidant to obtain a premix, wherein the mixing time is more than or equal to 15min;
(2) Adding 5-3mm and 3-1mm magnesia-alumina carbon reclaimed materials into a mixing machine for mixing for 3min, then sequentially adding flake graphite, premix and liquid phenolic resin, and discharging after mixing;
(3) Carrying out mechanical press molding on the mixed material after the mixing to obtain a molded green brick;
(4) And drying the formed green bricks by a drying kiln at the temperature of between normal temperature and 200 ℃ to prepare the mechanically pressed tundish hanging plate.
In the step (3), a 1600t electric screw press is adopted for striking molding, and the density of the molded green bricks is higher than 20 striking times>2.9g/cm 3 。
The specification of the mechanically pressed tundish hanging plate is 900mm (length) by 400mm (width) by 40mm (thickness).
Comparative example 3
This comparative example provides a tundish hanging plate which is prepared from conventional raw materials and preparation methods. The raw materials comprise the following components: 20Kg of 5-3mm high bauxite, 30Kg of 3-1mm high bauxite, 20Kg of 1-0mm platy corundum, 10Kg of 325 mesh electric fused white corundum, 5Kg of 200 mesh magnesia alumina spinel, 8Kg of alumina micropowder, 3Kg of aluminate cement and 4Kg of high efficiency water reducing agent.
The preparation method comprises the following steps:
(1) Alumina particles, corundum powder, spinel powder, alumina micropowder, cement and a water reducer are uniformly mixed, and 4.5% of water is added for stirring.
(2) Placing the stirred pug into a mould, vibrating and forming, demoulding after the wet blank has strength, drying and packaging.
The wet green body normal temperature flexural strength, the wet green body normal temperature compressive strength and the wet green body high temperature flexural strength of the formed green body of the tundish hanging plate prepared in the examples and the comparative examples are detected, and the detection method is as follows:
the method for detecting the normal-temperature flexural strength of the wet blank comprises the following steps: GB/T3001-2007.
The method for detecting the normal-temperature compressive strength of the wet blank comprises the following steps: GB/T5072-2008.
The method for detecting the high-temperature flexural strength (1450 ℃ heat preservation for 30 min) of the wet blank comprises the following steps: GB/T3002-2017.
The results are shown in Table 1:
TABLE 1
As can be seen from the data in the table, the wet blank of the tundish hanging plate (examples 1 to 3) of the present invention has higher normal temperature fracture resistance and high temperature fracture resistance, so that the wet blank can be mechanically formed, and the wet blank can be dried to obtain a tundish hanging plate with a specification of 900mm (length) by 400mm (width) by 40mm (thickness), and the wet blank has a large and thin size.
The formula of the comparative example 1 is that the strength enhancer yellow dextrin is replaced by common clay, and the formula of the comparative example 2 is that the calcium aluminate cement is replaced by alumina micropowder, so that the wet blank has insufficient normal-temperature fracture resistance, normal-temperature pressure resistance and high-temperature fracture strength; comparative example 3 the wet blank prepared by the existing formulation has significantly lower normal temperature fracture resistance, normal temperature pressure resistance and high temperature fracture strength than the present invention.
In conclusion, the raw materials are matched with each other and complement each other through the optimization of the formula, so that the strength of a wet blank can be effectively improved, the mechanical pressing preparation of the tundish hanging plate is realized, and the tundish hanging plate with large and thin size, good anti-scouring performance, high-temperature breaking strength and molten steel erosion resistance is obtained.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (9)

1. The tundish hanging plate is characterized in that the preparation raw materials of the tundish hanging plate comprise main materials and binding agents, and the main materials comprise the following components: 42-50 wt% of regenerated reclaimed materials, 10-19wt% of fused magnesia particles, 0-19wt% of fused magnesia fine powder, 10-19wt% of white corundum particles, 0-19wt% of white corundum fine powder, 3-6wt% of crystalline flake graphite, 0.5-1.5 wt% of calcium aluminate cement, 0.5-1.5 wt% of strength enhancer and 0.5-1.5 wt% of antioxidant; the regenerated reclaimed material is at least one selected from magnesia-alumina-carbon regenerated reclaimed material, alumina-magnesia-carbon regenerated reclaimed material and alumina-carbon regenerated reclaimed material; the strength enhancer is yellow dextrin;
the bonding agent is liquid phenolic resin, and the weight of the bonding agent accounts for 3-4% of the weight of the main material.
2. The tundish hanging plate according to claim 1, wherein the main material comprises the following components: 45-48 wt% of recycled materials, 10-19wt% of fused magnesia particles, 5-19wt% of fused magnesia fine powder, 10-19wt% of white corundum particles, 5-19wt% of white corundum fine powder, 3-6wt% of crystalline flake graphite, 0.8-1.2 wt% of calcium aluminate cement, 0.8-1.2 wt% of strength enhancer and 0.8-1.2 wt% of antioxidant.
3. The tundish hanging plate according to claim 1, wherein the magnesium aluminum carbon regenerated reclaimed material comprises at least one of 5-3mm and 3-1mm particles; the percentage content of MgO in the magnesium aluminum carbon reclaimed material is more than or equal to 68 percent, al 2 O 3 The percentage content of (2) is less than or equal to 12 percent; and/or the number of the groups of groups,
the aluminum-magnesium-carbon regeneration recycling material bagAt least one of 5-3mm and 3-1mm particles; al in the aluminum-magnesium-carbon reclaimed material 2 O 3 The percentage content of MgO is more than or equal to 65 percent, and the percentage content of MgO is less than or equal to 16 percent; and/or the number of the groups of groups,
the aluminum carbon regeneration reclaimed material comprises at least one of 5-3mm and 3-1mm particles; al in the aluminum carbon regeneration reclaimed material 2 O 3 The percentage content of C is more than or equal to 85 percent and the percentage content of C is less than or equal to 4 percent.
4. The tundish hanging plate according to claim 1, wherein the granularity of the fused magnesia particles is 1-0mm, and the percentage content of MgO is more than or equal to 96%; and/or the granularity of the fused magnesia fine powder is 180 meshes, and the percentage content of MgO is more than or equal to 96 percent.
5. The tundish hanging plate according to claim 1, wherein the granularity of the white corundum particles is 1-0mm, al 2 O 3 The percentage content of (2) is more than or equal to 99 percent; and/or the granularity of the white corundum fine powder is 200 meshes, al 2 O 3 The percentage content of (2) is more than or equal to 99 percent.
6. The tundish hanging plate according to claim 1, characterized in that, in the calcium aluminate cement, al is as follows 2 O 3 The percentage content of (2) is more than or equal to 70 percent; and/or, the particle size of the flake graphite is 100 meshes, and the percentage content of carbon is 94%; and/or the antioxidant is metal aluminum powder, and the percentage content of aluminum is more than or equal to 99%.
7. A tundish hanger plate according to claim 1, wherein the tundish hanger plate is 900mm x 400mm x 40mm.
8. A method of making a tundish hanging plate as claimed in any one of claims 1 to 7, comprising the steps of:
(1) Uniformly mixing the white corundum particles, the fused magnesia particles, the white corundum fine powder, the fused magnesia fine powder, the calcium aluminate cement, the strength enhancer and the antioxidant to obtain a premix;
(2) Adding the regenerated reclaimed materials into a mixing machine for mixing, then sequentially adding the flake graphite, the premix and the binding agent, mixing and discharging to obtain a mixture;
(3) Performing mechanical press forming on the mixture to obtain a formed green brick;
(4) And drying the formed green bricks to prepare the tundish hanging plate.
9. The method according to claim 8, wherein in the step (3), the electric screw press with 1600t is used for the striking molding, and the number of striking times is more than 20, and the density of the molded green brick is higher than that of the molded green brick>2.9g/cm 3 。
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