CN108424155B - Lower nozzle brick prepared from slide plate grinding mud waste and preparation method thereof - Google Patents

Lower nozzle brick prepared from slide plate grinding mud waste and preparation method thereof Download PDF

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CN108424155B
CN108424155B CN201810376225.5A CN201810376225A CN108424155B CN 108424155 B CN108424155 B CN 108424155B CN 201810376225 A CN201810376225 A CN 201810376225A CN 108424155 B CN108424155 B CN 108424155B
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granularity
percent
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less
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CN108424155A (en
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闫昕
陈松林
刘士范
蒋正跃
胡小成
王俊涛
袁林
胡建辉
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YIXING REFRACTORY 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
    • C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
    • 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
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • C04B33/132—Waste materials; Refuse; Residues
    • C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Casting Support Devices, Ladles, And Melt Control Thereby (AREA)

Abstract

The invention relates to a lower nozzle brick prepared by utilizing a sliding plate grinding mud waste material and a preparation method thereof, wherein the lower nozzle brick comprises the following raw materials: 30-40% of 85 alumina with the granularity of 3-1 mm; 20-30% of 85 alumina with the granularity of 1-0 mm; 3-6% of Veronica mud with the granularity less than or equal to 0.088 mm; 2-5% of 94% of metal silicon powder with the particle size less than or equal to 0.045 mm; 20-35% of recycled sliding plate grinding mud with the granularity less than or equal to 0.045 mm; alpha-Al with particle size less than or equal to 2 mu m2O33-5% of micro powder; -194 flake graphite 1-5%; 3-7% of a binder phenolic resin. The aluminum-zirconium-carbon sliding plate grinding mud waste is added into the raw materials, so that the aluminum-zirconium-carbon sliding plate grinding mud waste has good erosion resistance and thermal shock resistance, the effects of reducing the cost, reducing the cracks and the stripping of a steel ladle lower nozzle and prolonging the service life of the lower nozzle are achieved, the aluminum-zirconium-carbon sliding plate grinding mud waste is applied to a large-scale continuous casting steel ladle, the service life is stabilized for more than 2 times, and the trend of energy conservation and emission reduction.

Description

Lower nozzle brick prepared from slide plate grinding mud waste and preparation method thereof
Technical Field
A lower nozzle brick made of sliding plate grinding mud waste and a preparation method thereof relate to a waste refractory material recycling technology, and belong to the field of inorganic non-metallic materials.
Background
The sliding gate nozzle system is a steel flow control system for ladles and tundishes, and is one of the important components of a non-oxidation continuous casting protection system. The sliding plate is made of aluminum carbon and aluminum zirconium carbon as main materials. The main raw materials for producing the aluminum-zirconium-carbon sliding plate comprise special-grade alumina clinker, fused corundum, tabular alumina and other high-grade aluminum-silicon refractory raw materials, crystalline flake graphite is used as a carbon source, zirconia is introduced by adding the fused zirconia corundum or zirconia mullite, an antioxidant is added, resin is used as a bonding agent, and the aluminum-zirconium-carbon sliding plate is prepared by the working procedures of mixing, molding, firing, grinding and the like. In the production and manufacturing process of the sliding plate, due to the fact that the requirement on the flatness of the working surface of the sliding plate is strict and is generally smaller than 0.05mm, mechanical grinding is needed, 3-8% of grinding mud waste materials are generated usually, and no ideal treatment method exists for the grinding mud waste materials at present. The development of the technology for recycling the waste grinding mud of the sliding plate has very important significance for saving data and reducing cost. The sliding down nozzle of the ladle is a matching component of the sliding plate, guides molten steel to flow out, and has good thermal shock resistance and high temperature resistance to erosion and erosive wear of the molten steel. The main material is aluminum carbon, the used raw materials are similar to those of the sliding plate, but the grade of the raw materials is lower, so that the sliding plate grinding mud waste material can be used for preparing the drainage port. The invention aims to develop a technology for preparing a drainage port by utilizing a sliding plate grinding mud waste material and solve the problem of resource waste.
Disclosure of Invention
According to the invention, the aluminum-zirconium-carbon sliding plate grinding mud waste is added, so that the brick has good erosion resistance and thermal shock resistance, and the effects of reducing cost, reducing cracks and stripping of a ladle nozzle and prolonging the service life of the nozzle are achieved.
The formula (weight and particle size content) of the invention is as follows:
(1) 30-40% of 85 alumina with the granularity of 3-1mm
(2) 20-30% of 85 alumina with the granularity of 1-0mm
(3) 3-6% of Veronica officinalis mud with the granularity of less than or equal to 0.088mm
(4) 94 percent of metal silicon powder with the granularity less than or equal to 0.045mm and 2 to 5 percent of metal silicon powder
(5) 20-35% of recycled sliding plate grinding mud with granularity less than or equal to 0.045mm
(6) alpha-Al with particle size less than or equal to 2 mu m2O33 to 5 percent of micro powder
(7) 1 to 5 percent of-194 flake graphite
(8) 3-7% of binder phenolic resin
The 85 alumina is a commercial refractory raw material, wherein Al is contained in the alumina2O3≥85%、Fe2O3≤2.0%；
The Vero mud is a commercial refractory ball clay (Guangxi white mud), wherein Al is2O3≥34%，Fe2O3<2.0%；
The metal silicon powder is a commercially available refractory raw material, and the Si content is more than or equal to 94%;
the recycled waste skateboard grinding mud is subjected to classified recycling, deposition, acid washing by adopting industrial dilute nitric acid with the mass fraction of 50-70%, filtering, drying at 150-200 ℃ for 80-100 hours, crushing by a vibration mill, and processing by adopting a 325-mesh sieve to obtain fine powder with the particle size of less than or equal to 0.045mm, and the components are as follows:
Al2O3 ZrO2 CaO SiO2 Fe2O3 C
≥75 ≥5 ≤0.5 ≥10 ≤0.5 ≥8
the alpha to Al2O3The micro powder is a commercially available refractory raw material, wherein Al2O3≥99.0%，Na2O+K2O≤0.5%；
The-194 flake graphite is a commercial refractory raw material, wherein the content of C is more than or equal to 94%;
the phenolic resin is commercially available phenolic resin for refractory materials.
The specific process of the invention comprises the following parts:
(1) carrying out strong premixing on fine powder with the particle size of less than or equal to 0.088mm, fine powder with the particle size of less than or equal to 0.045mm and micro powder with the particle size of less than or equal to 2 mu m for 15-20 minutes;
(2) dry-mixing 85 alumina particles with the particle size of 3-1mm and 1-0mm for 2-3 minutes according to a proportion, adding a small amount of resin binder, adding all the premixed fine powder and micro powder, dry-mixing for 4-8 minutes, adding the rest resin binder, and homogenizing into a mixture through strong mixing and grinding, wherein the effective mixing and grinding time is 25-45 minutes;
(3) after the mixture is discharged, screening the mixture by using a 5mm sieve to remove agglomerated large blocks;
(4) ageing the mixture for 24 to 36 hours under the conditions of constant temperature and constant humidity;
(5) pressing and forming;
(6) naturally drying for 36-48 hours, and then drying for 24-36 hours at 240-280 ℃;
(7) sticking the shell and packaging.
The ladle sliding drain produced by the invention has excellent thermal shock stability and erosion resistance, is applied to a large-scale continuous casting ladle, and has the service life stabilized for more than 2 times. Compared with the prior art, the invention has the following remarkable distinguishing characteristics:
(1) recycling of waste refractory materials
The waste material of the high-temperature sintered aluminum-zirconium-carbon slide plate grinding mud is recycled and treated by classification and is used as Al2O3-ZrO2the-C composite powder replaces high-aluminum fine powder in the formula, so that the thermal shock stability of the material is improved and the material cost is reduced while the service life is ensured. The grinding mud is recycled, so that the secondary utilization of resources is realized, the waste of aluminum resources is reduced, the use of high-alumina bauxite is reduced, and the energy consumption in the process of sintering the bauxite is reduced; accords with the trend of energy conservation and emission reduction, and has great economic and social benefits.
(2) Reduce material cost
In recent years, the national environmental protection department aims at a series of policies of limiting production, reducing production and upgrading and transforming production lines of raw material production enterprises, so that the raw materials are in short supply, the price is high, and the waste refractory materials can be recycled and reused to gradually replace the initial materials. The aluminum-zirconium-carbon sliding plate grinding mud waste used by the invention is always treated as an industrial waste, is convenient to recycle and has low cost. Therefore, the invention can obviously reduce the production cost of enterprises, effectively improve the cost performance and market competitiveness of products and has obvious economic benefit.
(3) Reliable performance
The high-temperature sintered aluminum-zirconium-carbon slide plate grinding mud waste material used by the invention contains fused zirconia mullite or fused zirconia corundum, and zirconia exists in zirconium-containing raw materials of zirconia mullite and zirconia corundum as baddeleyite. When the monoclinic zirconia is heated and cooled, monoclinic-tetragonal reversible crystal form transformation occurs at 1000-1200 ℃, the volume effect of expansion/contraction is 7-9%, and the crystal form transformation of the zirconia is accompanied by the characteristic of microcrack toughening, so that the toughness and the strength of the water gap material can be improved, the thermal shock resistance stability of the material is improved, and meanwhile, the monoclinic zirconia is stable and has excellent erosion resistance.
Detailed Description
Example 1
The ladle sliding drain nozzle is produced according to the following formula and process:
(1) strongly premixing 6 percent of Vero mud with the particle size of less than or equal to 0.088mm, 4 percent of 94 percent of metal silicon powder with the particle size of less than or equal to 0.045mm, 20 percent of recycled sliding plate grinding mud with the particle size of less than or equal to 0.045mm, 5 percent of alumina micropowder with the particle size of 2 mu m and 5 percent of-194 flake graphite for 15 minutes;
(2) according to the proportion of 35 percent of alumina with the granularity of 3-1mm and 25 percent of alumina with the granularity of 1-0mm, dry-mixing for 3 minutes, adding a small amount of phenolic resin binding agent, adding the premixed fine powder, mixing and grinding for 4 minutes, then adding the phenolic resin binding agent, and homogenizing into a mixture through strong mixing and grinding, wherein the total adding amount of the binding agent is 3.0 percent, and the mixing effective time is 35 minutes;
(3) discharging the mixture, and sieving with a 5mm sieve to remove agglomerated large blocks;
(4) ageing for 24 hours under the conditions of constant temperature and constant humidity;
(5) pressing and forming;
(6) naturally drying for 48 hours, and then drying for 36 hours at 260 ℃;
(7) sticking the shell and packaging.
Table 1 shows the specifications and formulation of the raw materials and their properties of example 1, which, when tested, had a bulk density of 2.64g/cm3The apparent porosity is 11%, the normal temperature compressive strength reaches 85Mpa, after the heat treatment of 1450 ℃ for X0.5 hours, the air cooling is carried out, the thermal shock resistance stability reaches 7 times, the average service life is more than 2 times when the material is tried in a Tang steel works (120 tons of steel ladles), only fine cracks exist, the cracking and stripping phenomena are avoided, and the use requirements of the existing products are met.
Example 2
The ladle sliding drain nozzle is produced according to the following formula and process:
(1) strongly premixing for 20 minutes according to the proportion of 4 percent of Vero mud with the granularity less than or equal to 0.088mm, 5 percent of 94 percent of metal silicon powder with the granularity less than or equal to 0.045mm, 25 percent of recycled sliding plate grinding mud with the granularity less than or equal to 0.045mm, 4 percent of alumina micropowder with the granularity of 2 mu m and 2 percent of-194 flake graphite;
(2) according to the proportion of 35 percent of alumina with the granularity of 3-1mm and 25 percent of alumina with the granularity of 1-0mm, dry-mixing for 3 minutes, adding a small amount of phenolic resin binding agent, adding the premixed fine powder, mixing and grinding for 5 minutes, then adding the phenolic resin binding agent, and homogenizing into a mixture through strong mixing and grinding, wherein the total addition of the binding agent is 4.5 percent, and the mixing effective time is 35 minutes;
(3) discharging the mixture, and sieving with a 5mm sieve to remove agglomerated large blocks;
(4) ageing for 30 hours under the conditions of constant temperature and constant humidity;
(5) pressing and forming;
(6) naturally drying for 30 hours, and then drying for 24 hours at 280 ℃;
(7) sticking the shell and packaging.
Table 1 shows the specifications and formulation of the raw materials and their properties of example 2, which was tested to have a bulk density of 2.68g/cm3The apparent porosity is 10%, the normal temperature compressive strength reaches 89Mpa, after the heat treatment of 1450 ℃ X0.5 hours, the air cooling is carried outThe thermal shock resistance stability reaches 9 times, the service life reaches 3 times and the maximum service life reaches 4 times when the steel is tried in a certain steel plant (100 tons of steel ladles), only fine cracks exist, cracking and stripping phenomena do not occur, the corrosion resistance is strong, and the steel can completely replace the conventional product.
Example 3
The ladle sliding drain nozzle is produced according to the following formula and process:
(1) strongly premixing for 15 minutes according to the proportion of 4 percent of Vero mud with the granularity less than or equal to 0.088mm, 3 percent of 94 percent of metal silicon powder with the granularity less than or equal to 0.045mm, 26 percent of recycled sliding plate grinding mud with the granularity less than or equal to 0.045mm, 4 percent of alumina micropowder with the granularity of 2 mu m and 3 percent of-194 flake graphite;
(2) according to the proportion of 40 percent of 85 alumina with the granularity of 3-1mm and 20 percent of 85 alumina with the granularity of 1-0mm, dry-mixing for 3 minutes, adding a small amount of phenolic resin binding agent, adding the premixed fine powder, mixing and grinding for 5 minutes, then adding the phenolic resin binding agent, and homogenizing into a mixture through strong mixing and grinding, wherein the total addition of the binding agent is 4.7 percent, and the mixing effective time is 30 minutes;
(3) discharging the mixture, and sieving with a 5mm sieve to remove agglomerated large blocks;
(4) ageing for 36 hours under the conditions of constant temperature and constant humidity;
(5) pressing and forming;
(6) naturally drying for 40 hours, and then drying for 36 hours at the temperature of 240 ℃;
(7) sticking the shell and packaging.
Table 1 shows the specifications and formulation of the raw materials and their properties of example 3, which, when tested, had a bulk density of 2.72g/cm3The apparent porosity is 11%, the normal temperature compressive strength reaches 91Mpa, after the heat treatment of 1450 ℃ for X0.5 hours, the air cooling is carried out, the thermal shock resistance stability reaches 8 times, the trial is carried out in a steel factory (60 tons of steel ladles) in the west, the steel factory mainly smelts special steel, the molten steel has strong corrosivity and strict requirements on refractory materials, but the service life of a test product reaches 2 times, only fine cracks exist, and the cracking and stripping phenomena are avoided.
Example 4
The ladle sliding drain nozzle is produced according to the following formula and process:
(1) strongly premixing for 15 minutes according to the proportion of 5 percent of Vero mud with the granularity less than or equal to 0.088mm, 2 percent of 94 percent of metal silicon powder with the granularity less than or equal to 0.045mm, 28 percent of recycled sliding plate grinding mud with the granularity less than or equal to 0.045mm, 3 percent of alumina micropowder with the granularity of 2 mu m and 2 percent of-194 flake graphite;
(2) according to the proportion of 30 percent of 85 alumina with the granularity of 3-1mm and 30 percent of 85 alumina with the granularity of 1-0mm, dry-mixing for 3 minutes, adding a small amount of phenolic resin binding agent, adding the premixed fine powder, mixing and grinding for 5 minutes, then adding the phenolic resin binding agent, and homogenizing into a mixture through strong mixing and grinding, wherein the total adding amount of the binding agent is 5.5 percent, and the mixing effective time is 30 minutes;
(3) discharging the mixture, and sieving with a 5mm sieve to remove agglomerated large blocks;
(4) ageing for 24 hours under the conditions of constant temperature and constant humidity;
(5) pressing and forming;
(6) naturally drying for 36 hours, and then drying for 30 hours at 270 ℃;
(7) sticking the shell and packaging.
Table 1 shows the specifications and formulation of the raw materials and their properties of example 4, which, when tested, had a bulk density of 2.61/cm3The apparent porosity is 10%, the normal temperature compressive strength reaches 86Mpa, after the heat treatment of 1450 ℃ for X0.5 hours, the steel is cooled in air, the thermal shock resistance stability reaches 6 times, and the steel is tried out in a steel factory (60 tons of steel ladles) in the west, the steel factory mainly smelts special steel, has strong molten steel corrosivity and strict requirements on refractory materials, but the service life of a test product is 2 times on average, and the test product has fine cracks and does not have cracking and stripping phenomena.
Example 5
The ladle sliding drain nozzle is produced according to the following formula and process:
(1) strongly premixing 3 percent of Veronica mud with the particle size of less than or equal to 0.088mm, 3 percent of 94 percent of metal silicon powder with the particle size of less than or equal to 0.045mm, 35 percent of recycled sliding plate grinding mud with the particle size of less than or equal to 0.045mm, 3 percent of alumina micropowder with the particle size of 2 mu m and 1 percent of-194 flake graphite for 18 minutes;
(2) according to the proportion of 35 percent of alumina with the granularity of 3-1mm and 20 percent of alumina with the granularity of 1-0mm, dry-mixing for 3 minutes, adding a small amount of phenolic resin binding agent, adding the premixed fine powder, mixing and grinding for 8 minutes, then adding the phenolic resin binding agent, and homogenizing into a mixture through strong mixing and grinding, wherein the total addition amount of the binding agent is 7.0 percent, and the mixing effective time is 45 minutes;
(3) discharging the mixture, and sieving with a 5mm sieve to remove agglomerated large blocks;
(4) ageing for 24 hours under the conditions of constant temperature and constant humidity;
(5) pressing and forming;
(6) naturally drying for 40 hours, and then drying for 36 hours at 250 ℃;
(7) sticking the shell and packaging.
Table 1 shows the specifications and formulation of the raw materials and their properties of example 5, which, when tested, had a bulk density of 2.64/cm3The apparent porosity is 10%, the normal temperature compressive strength reaches 82Mpa, after the heat treatment of 1450 ℃ for X0.5 hours, the air cooling is carried out, the thermal shock resistance stability reaches 6 times, the trial in an Anzhi steel mill (80 tons of steel ladles) shows that the service life of the test product is average 2 times, fine cracks are formed, and the cracking and stripping phenomena are avoided.
Comparative example 1
The ladle sliding drain nozzle is produced according to the following formula and process:
(1) performing strong premixing for 15 minutes according to the proportion of 2 percent of Veronica mud with the granularity less than or equal to 0.088mm, 1 percent of 94 percent of metal silicon powder with the granularity less than or equal to 0.045mm, 40 percent of recycled sliding plate grinding mud with the granularity less than or equal to 0.045mm, 2 percent of alumina micropowder with the granularity of 2 mu m and 0 percent of-194 flake graphite;
(2) according to the proportion of 25 percent of 85 alumina with the granularity of 3-1mm and 30 percent of 85 alumina with the granularity of 1-0mm, dry-mixing for 5 minutes, adding a small amount of phenolic resin binding agent, adding the premixed fine powder, mixing and grinding for 5 minutes, then adding the phenolic resin binding agent, and homogenizing into a mixture through strong mixing and grinding, wherein the total addition of the binding agent is 4.5 percent, and the mixing effective time is 35 minutes;
(3) discharging the mixture, and sieving with a 5mm sieve to remove agglomerated large blocks;
(4) ageing for 24 hours under the conditions of constant temperature and constant humidity;
(5) pressing and forming;
(6) naturally drying for 48 hours, and then drying for 36 hours at 260 ℃;
(7) sticking the shell and packaging.
Table 1 shows the specifications and formulation of the raw materials and their properties of comparative example 1, which was tested to have a bulk density of 2.45/cm3The apparent porosity is 14%, the normal temperature compressive strength reaches 50Mpa, after the heat treatment of 1450 ℃ for X0.5 hours, the air cooling is carried out, the thermal shock resistance stability reaches 3 times, and the performance is poor and the material is not tried in a steel mill.
Comparative example 2
The ladle sliding drain nozzle is produced according to the following formula and process:
(1) performing strong premixing for 10 minutes according to the proportion of 2 percent of Veronica mud with the granularity less than or equal to 0.088mm, 1 percent of 94 percent of metal silicon powder with the granularity less than or equal to 0.045mm, 42 percent of recycled sliding plate grinding mud with the granularity less than or equal to 0.045mm, 1 percent of alumina micropowder with the granularity of 2 mu m and 1 percent of-194 flake graphite;
(2) according to the proportion of 30 percent of 85 alumina with the granularity of 3-1mm and 23 percent of 85 alumina with the granularity of 1-0mm, dry-mixing for 3 minutes, adding a small amount of phenolic resin binding agent, adding the premixed fine powder, mixing and grinding for 6 minutes, then adding the phenolic resin binding agent, and homogenizing into a mixture through strong mixing and grinding, wherein the total adding amount of the binding agent is 6.5 percent, and the mixing effective time is 40 minutes;
(3) discharging the mixture, and sieving with a 5mm sieve to remove agglomerated large blocks;
(4) ageing for 24 hours under the conditions of constant temperature and constant humidity;
(5) pressing and forming;
(6) naturally drying for 40 hours, and then drying for 36 hours at 260 ℃;
(7) sticking the shell and packaging.
Table 1 shows the specifications and formulation of the raw materials and their properties of comparative example 1, which was tested to have a bulk density of 2.38/cm3The apparent porosity is 15%, the normal temperature compressive strength reaches 45Mpa, after heat treatment at 1450 ℃ for 0.5 hour, the cracking and stripping phenomena occur after air cooling and thermal shock resistance stability reaches 2 times, and the method is not tried in steel plants.
Comparative example 3
The ladle sliding drain nozzle is produced according to the following formula and process:
(1) strongly premixing 3 percent of Vero mud with the particle size of less than or equal to 0.088mm, 3 percent of 94 percent of metal silicon powder with the particle size of less than or equal to 0.045mm, 27 percent of recycled sliding plate grinding mud with the particle size of less than or equal to 0.045mm, 4 percent of alumina micropowder with the particle size of 2 mu m and 3 percent of-194 flake graphite for 10 minutes;
(2) according to the proportion of 34 percent of alumina with the granularity of 3-1mm and 26 percent of alumina with the granularity of 1-0mm, dry-mixing for 3 minutes, adding a small amount of phenolic resin binding agent, adding the premixed fine powder, mixing and grinding for 5 minutes, then adding the phenolic resin binding agent, and homogenizing into a mixture through strong mixing and grinding, wherein the total addition amount of the binding agent is 2.7 percent, and the mixing effective time is 25 minutes;
(3) discharging the mixture, and sieving with a 5mm sieve to remove agglomerated large blocks;
(4) ageing for 36 hours under the conditions of constant temperature and constant humidity;
(5) pressing and forming;
(6) naturally drying for 40 hours, and then drying for 36 hours at 200 ℃;
(7) sticking the shell and packaging.
Table 1 shows the specifications and formulation of the raw materials and their properties of comparative example 3, which was tested to have a bulk density of 2.57g/cm3The apparent porosity is 13%, the normal-temperature compressive strength reaches 57Mpa, and the block falling phenomenon appears after the heat treatment at 1450 ℃ for X0.5 hours and the air cooling and the thermal shock resistance stability reach 3 times, and the method is not tried in a steel plant.
The specifications, the formula and the test performance of the raw materials of the ladle nozzle brick prepared by the above examples and comparative examples are as follows in table 1:
table 1 specification of raw materials, formulation and test performance of the lower nozzle brick.
Figure 606610DEST_PATH_IMAGE001

Claims (9)

1. The utility model provides an utilize lower nozzle brick that slide grinding mud waste material was made which characterized in that: the raw material formula is as follows:
(1) 30-40% of 85 alumina with the granularity of 3-1mm
(2) 20-30% of 85 alumina with the granularity of 1-0mm
(3) 3-6% of Veronica officinalis mud with the granularity of less than or equal to 0.088mm
(4) 94 percent of metal silicon powder with the granularity less than or equal to 0.045mm and 2 to 5 percent of metal silicon powder
(5) 20-35% of recycled sliding plate grinding mud with granularity less than or equal to 0.045mm
(6) alpha-Al with particle size less than or equal to 2 mu m2O33 to 5 percent of micro powder
(7) 1 to 5 percent of-194 flake graphite
(8) 3-7% of a binder phenolic resin.
2. The lower nozzle brick according to claim 1, characterized in that: the 85 alumina is a commercial refractory raw material, wherein Al is contained in the alumina2O3≥85%、Fe2O3≤2.0%。
3. The lower nozzle brick according to claim 1, characterized in that: the veronica is a commercially available refractory ball clay, wherein Al is2O3≥34%，Fe2O3<2.0%。
4. The lower nozzle brick according to claim 1, characterized in that: the 94% of metal silicon powder is a commercial refractory raw material, and the Si content is more than or equal to 94%.
5. The lower nozzle brick according to claim 1, characterized in that: the components of the recycled sliding plate grinding mud waste material comprise the following components in percentage by weight: al (Al)2O3≥75%、ZrO2≥5%、CaO≤0.5%、SiO2≥10% 、Fe2O3≤0.5%、C≥8%。
6. The lower nozzle brick according to claim 5, characterized in that: the recycled sliding plate grinding mud waste is obtained by adopting the following treatment: classifying, recovering, depositing, pickling with 50-70 wt% industrial dilute nitric acid, filtering, stoving at 150-200 deg.c for 80-100 hr, vibrating, grinding and treating with 325 mesh sieve to obtain fine powder of granularity not greater than 0.045 mm.
7. The lower nozzle brick according to claim 1, characterized in that: the alpha to Al2O3The micro powder is a commercially available refractory raw material, wherein Al2O3≥99.0%，Na2O+K2O≤0.5%。
8. The lower nozzle brick according to claim 1, characterized in that: the-194 flake graphite is a commercially available refractory raw material, the fixed carbon content is more than or equal to 94%, and the phenolic resin is phenolic resin for a commercially available refractory material.
9. A process for the preparation of a lower nozzle brick according to any one of claims 1 to 8, comprising the steps of:
(1) carrying out strong premixing on fine powder, micro powder and flake graphite with the particle size of less than or equal to 0.088mm, the particle size of less than or equal to 0.045mm and the particle size of less than or equal to 2 mu m for 15-20 minutes;
(2) dry-mixing 85 alumina particles of 3-1mm and 1-0mm in proportion for 2-3 minutes, adding a small amount of resin binder, adding all the premixed fine powder and micro powder, dry-mixing for 4-8 minutes, adding the rest resin binder, and homogenizing into a mixture through strong mixing and grinding, wherein the effective mixing and grinding time is 25-45 minutes;
(3) after the mixture is discharged, screening the mixture by using a 5mm sieve to remove agglomerated large blocks;
(4) ageing the mixture for 24 to 36 hours under the conditions of constant temperature and constant humidity;
(5) pressing and forming;
(6) naturally drying for 36-48 hours, and then drying for 24-36 hours at 240-280 ℃;
(7) sticking the shell and packaging.
CN201810376225.5A 2018-04-25 2018-04-25 Lower nozzle brick prepared from slide plate grinding mud waste and preparation method thereof Active CN108424155B (en)

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