CN108033799B - Castable for semi-steel tank nozzle - Google Patents

Castable for semi-steel tank nozzle Download PDF

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Publication number
CN108033799B
CN108033799B CN201711338829.2A CN201711338829A CN108033799B CN 108033799 B CN108033799 B CN 108033799B CN 201711338829 A CN201711338829 A CN 201711338829A CN 108033799 B CN108033799 B CN 108033799B
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powder
semi
castable
particle size
steel
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CN108033799A (en
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青光红
王彬
黄天翔
黄军成
胡志豪
高亮
邓小兵
陈超
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Gangcheng Group Liangshan Ruihai Industry Co ltd
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Gangcheng Group Liangshan Ruihai Industry 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
    • 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
    • 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
    • C04B2235/02—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
    • C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
    • C04B2235/3241—Chromium oxides, chromates, or oxide-forming salts thereof
    • 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
    • C04B2235/02—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
    • C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
    • C04B2235/3418—Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
    • 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
    • C04B2235/02—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
    • C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
    • C04B2235/447—Phosphates or phosphites, e.g. orthophosphate or hypophosphite
    • 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
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/52—Constituents or additives characterised by their shapes
    • C04B2235/5208—Fibers
    • C04B2235/5216—Inorganic
    • C04B2235/524—Non-oxidic, e.g. borides, carbides, silicides or nitrides
    • 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
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
    • 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
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Ceramic Products (AREA)

Abstract

Hair brushThe invention discloses a semi-steel tank nozzle castable, and particularly relates to a semi-steel tank nozzle castable in the technical field of refractory materials for cold repair of steelmaking semi-steel tanks. The semi-steel tank nozzle castable comprises aggregate, powder and fiber, wherein the aggregate consists of corundum slag and flint clay, and the powder comprises Al2O3Micro powder, alumina powder, Guangxi white mud, micro silicon powder and cement. The castable for the semi-steel tank nozzle has high-temperature breaking strength, thermal shock resistance and slag adhesion resistance, is good in construction condition of the semi-steel tank nozzle, has no material falling and cracking phenomena in the maintenance process, obviously prolongs the service cycle, well protects the steel shell of the nozzle, has no corresponding deformation, can improve the slag adhesion phenomenon in the application process, reduces the slag treatment time and reduces the labor intensity of steel shell treatment.

Description

Castable for semi-steel tank nozzle
Technical Field
The invention relates to a semi-steel tank nozzle castable, in particular to a semi-steel tank nozzle castable which relates to the technical field of refractory materials for cold repair of steelmaking semi-steel tanks.
Background
The blast furnace molten iron is pretreated by vanadium extraction or three-step separation to form semisteel, the steelmaking process of Sichuan Sichang steelworks is desulfurization-vanadium extraction-converter steelmaking, and also has a desulfurization procedure used by some steelworks, the procedure is generally carried out when the desulfurization procedure has problems so as to ensure the smooth production, the semisteel tank is used as a carrier for holding the semisteel, the transportation of the molten steel is usually realized by building or pouring a refractory material protective tank shell, the refractory materials are divided into a permanent layer material and a working layer material, the turnover time of the semisteel tank for the semisteel is generally about 1 hour, the main damage mechanism of the semisteel tank refractory material is that the semisteel washes the tank bottom refractory material, the tank nozzle when the semisteel is poured, generally, a certain clearance is reserved for the semisteel, the operating temperature of the tank nozzle when the semisteel is not contacted with the molten steel is generally 600 plus 700 ℃, the operating temperature of the tank nozzle when the semisteel is contacted with the molten steel is, the semi-steel tank mouth after iron adding usually sticks with a certain amount of iron and slag, and the sticking is more or less, which directly affects the labor intensity and the processing time of workers, so the semi-steel tank mouth refractory material is required to have certain high-temperature rupture strength, certain thermal shock resistance and certain slag sticking prevention capability.
With new content
The invention provides a castable for a semi-steel tank nozzle, which can enable a refractory material of the semi-steel tank nozzle to have high-temperature breaking strength, thermal shock resistance and slag adhesion resistance.
The semi-steel tank nozzle castable used for solving the problems comprises aggregate, powder and fiber, wherein the aggregate consists of corundum slag and flint clay, and the powder comprises Al2O3Micro powder, alumina powder, Guangxi white mud, micro silicon powder and cement.
Further, the aggregate accounts for 65-70% by mass, and the powder accounts for 30-33% by mass.
Furthermore, the powder material also comprises magnesia chrome brick powder.
Further, the cement is calcium aluminate A60 cement.
Further, the fibers are stainless steel fibers and explosion-proof fibers.
Further, the sodium hexametaphosphate is also included.
Further, the mass percentage of each material component is 20-23% of corundum slag particles with the particle size of 5-10mm, 17-20% of corundum slag particles with the particle size of 2-5mm, 8-12% of flint clay particles with the particle size of 1-3mm, 9-11% of flint clay particles with the particle size of 0.074mm-1mm, 11-13% of bauxite powder with the particle size of 0.074mm, 1-3% of Guangxi white mud with the particle size of 0.074mm, 4-6% of aluminum oxide micropowder with the particle size of 0.005mm, 5-10% of cement with the particle size of 0.074mm, 1-3% of silicon dust powder with the particle size of 0.074mm, 4-6% of magnesium chromium brick powder with the particle size of 0.074mm, 0.1% of industrial grade sodium hexametaphosphate, 0.5% of stainless steel fibers and 0,
further, the castable comprises the following chemical components in percentage by weight: al (Al)2O3≥40％，SiO2≥10％，Cr2O3≥1.5％。
The invention has the beneficial effects that: the castable for the semi-steel tank nozzle has high-temperature breaking strength, thermal shock resistance and slag adhesion resistance, is good in construction condition of the semi-steel tank nozzle, has no material falling and cracking phenomena in the maintenance process, obviously prolongs the service cycle, well protects the steel shell of the nozzle, has no corresponding deformation, can improve the slag adhesion phenomenon in the application process, reduces the slag treatment time and reduces the labor intensity of steel shell treatment.
Detailed Description
The castable for the semi-steel tank nozzle comprises aggregate, powder and fibers, wherein the aggregate is composed of corundum slag and flint clay, and the powder comprises Al2O3Micro powder, alumina powder, Guangxi white mud, micro silicon powder and cement.
The invention adopts corundum slag, flint clay, white corundum, alumina powder and white corundum powder to provide Al2O3Providing SiO by flint clay and silica fume2The early construction strength is provided by adopting cement, and the corundum slag contains 70 percent of Al2O3And more than 10% of MgO, so that the castable has strong acid and alkaline slag corrosion resistance and moderate high-temperature strength, and the adopted flint clay has the characteristics of stable volume after high-temperature calcination, high strength, low water absorption and the like, but has small volume density, good heat resistance and sintering property.
In addition, the refractory micro powder has similar or synchronous shape selection and particle components, does not crack and have poor binding property and the like in the early and middle stages after casting use, and is made of bauxite powder and Al2O3Micropowder mainly comprising Al2O3The mullite phase is a needle column and reacts with silica fume in the castable, Guangxi white mud and flint clay at high temperature to generate the mullite phaseThe castable is in a shape of a sphere, can prevent molten slag from permeating, reduce the apparent porosity of the castable, improve the compressive strength of the castable, and improve the spalling resistance and the thermal shock stability of the castable.
The explosion-proof fiber and the fine fibrous substance penetrate through all gaps of the casting material, and can conduct the discharge of water vapor in the baking process of the ladle pot, so that the phenomenon that the water vapor cannot be discharged and bursts to generate air holes is avoided.
The aggregate accounts for 65-70% by mass, and the powder accounts for 30-33% by mass. By combining the properties of the two refractory aggregates, when the aggregate components account for 65-70% of the product proportion, the aggregate components can play a role of supporting and locking powder materials at the initial stage, the strength can be well reflected in the later-stage high-temperature process, the service life of the aggregate components is stabilized, the proportion of the refractory micro powder is 30%, the refractory micro powder can form molten slurry in the process of adding water and stirring, gaps around the particles are filled, and the refractory aggregate has certain fluidity and is convenient for pouring construction.
The powder material also comprises magnesia chrome brick powder. Cr2O3 in the Mg-Cr brick powder has alpha-Al2O3The structure has good stability to acid and alkali, and has certain resistance to slag erosion, so that the lining body is protected, the slag adhesion of the semisteel tank is generally caused by the fact that slag and castable form molten products at high temperature, the molten products are accompanied by calcium hexaluminate, calcium dialuminate and the like, and the existence of cold steel enables the slag adhesion to be firmer, so that the formation of the slag phase can be prevented by adding Cr2O 3.
The cement is calcium aluminate A60 cement. The cement is calcium aluminate A60 cement, wherein the content of alumina is about 60%, the cement can be used as the cement of the invention, the cement has stable hydration performance, excellent mechanical strength and proper strength improvement, and is suitable for being used as the castable of the semi-steel tank nozzle to provide early construction strength. The silica fume, Al2O3 micro powder and alumina powder have certain binding performance in the hydration process, do not need to add any binding agent and meet the construction pouring requirement.
The fiber is stainless steel fiber and explosion-proof fiber. The stainless steel fibers combined with the CA60 cement provide higher green strength and medium temperature strength in the castable.
Also comprises sodium hexametaphosphate. The additive sodium hexametaphosphate is suitable for silicon-containing materials, has certain dispersibility and can improve the self-flowability of the castable.
The mass percentages of the components of the materials are 20-23% of corundum slag particles with the particle size of 5-10mm, 17-20% of corundum slag particles with the particle size of 2-5mm, 8-12% of flint clay particles with the particle size of 1-3mm, 9-11% of flint clay particles with the particle size of 0.074mm-1mm, 11-13% of bauxite powder with the particle size of 0.074mm, 1-3% of Guangxi white mud with the particle size of 0.074mm, 4-6% of aluminum oxide micropowder with the particle size of 0.005mm, 5-10% of cement with the particle size of 0.074mm, 1-3% of silicon dust powder with the particle size of 0.074mm, 4-6% of magnesium chromium brick powder with the particle size of 0.074mm, 0.1% of industrial grade sodium hexametaphosphate, 0.5% of,
the castable comprises the following chemical components in percentage by weight: al (Al)2O3≥40％，SiO2≥10％，Cr2O3≥1.5％。
In order to optimize the casting performance, the corundum slag contains more than or equal to 70 percent of aluminum oxide by weight, and the granularity is 5-10mm and 2-5 mm; the flint clay contains more than or equal to 42 percent of aluminum oxide and less than or equal to 52 percent of silicon dioxide by weight, and the particle size is 1-3mm and 0.088-1 mm; the Guangxi white mud contains more than or equal to 30 percent of aluminum oxide and less than or equal to 45 percent of silicon dioxide by weight, and the granularity of the Guangxi white mud is less than 0.088 mm; the bauxite powder contains more than or equal to 85 percent of aluminum oxide by weight and has the granularity less than 0.088 mm; the magnesia chrome brick powder contains more than or equal to 30 percent of chromic oxide by weight and has the granularity less than 0.088 mm; the aluminum oxide micro powder contains more than or equal to 98 percent of aluminum oxide by weight and has the granularity of less than 0.005 mm; the CA-60 cement is calcium aluminate cement, contains more than or equal to 50 percent of aluminum oxide by weight, and has the granularity of less than 0.088 mm; the micro silicon powder contains more than or equal to 94 percent of silicon dioxide by weight and has the granularity of less than 0.074 mm; the corresponding national standard of sodium hexametaphosphate is HG/T2837-1997; the corresponding brand of the explosion-proof fiber is JX-3-3; the corresponding mark of the stainless steel fiber is 446; the sum of the water contents of the raw materials is less than or equal to 1 percent.
Through tests, the castable for the semi-steel tank nozzle meets the physical and chemical indexes in the following table 1:
TABLE 1 physical and chemical index of castables for semi-steel tank nozzle
Figure BDA0001507912170000041
The invention will now be further described with reference to the following examples, but the invention is not limited thereto. The physical and chemical indexes of the main raw materials adopted in the embodiment, namely corundum slag, flint clay, alumina powder, alumina micropowder, silica fume, CA60 cement, Guangxi white mud and chromium oxide, are detected as shown in the following table 2:
TABLE 2 examination results of raw materials of semi-steel ladle nozzle castable for experiments
Figure BDA0001507912170000042
The technical indexes of the eight main raw materials are as follows: the corundum slag contains more than or equal to 70 percent of aluminum oxide by weight, and the granularity of the corundum slag is 5-10mm and 2-5 mm; the flint clay contains more than or equal to 42 percent of aluminum oxide and less than or equal to 52 percent of silicon dioxide by weight, and the particle size is 1-3mm and 0.088-1 mm; the Guangxi white mud contains more than or equal to 30 percent of aluminum oxide and less than or equal to 45 percent of silicon dioxide by weight, and the granularity of the Guangxi white mud is less than 0.088 mm; the bauxite powder contains more than or equal to 85 percent of aluminum oxide by weight and has the granularity less than 0.088 mm; the magnesia chrome brick powder contains more than or equal to 30 percent of chromic oxide by weight and has the granularity less than 0.088 mm; the aluminum oxide micro powder contains more than or equal to 98 percent of aluminum oxide by weight and has the granularity of less than 0.005 mm; the CA-60 cement is calcium aluminate cement, contains more than or equal to 50 percent of aluminum oxide by weight, and has the granularity of less than 0.088 mm; the micro silicon powder contains more than or equal to 94 percent of silicon dioxide by weight and has the granularity of less than 0.074 mm.
Example 1
22 parts by weight of 5mm-10mm corundum slag, 19 parts by weight of 2-5mm corundum slag, 11 parts by weight of 1-3mm flint clay, 11 parts by weight of 0.074mm-1mm flint clay are sent into a drum mixer to be mixed and stirred for 2min, 12 parts by weight of 0.074mm bauxite powder, 3 parts by weight of 0.074mm Guangxi white clay, 6 parts by weight of 0.005mm aluminum trioxide micropowder, 7 parts by weight of 0.074mm CA60 cement, 6 parts by weight of magnesium chromium brick powder, 3 parts by weight of 0.074mm silica fume and 0.1 part by weight of industrial grade sodium hexametaphosphate, 0.5 part by weight of stainless steel fiber and 0.03 part by weight of explosion-proof fiber are sent into the drum mixer to be mixed and stirred for 4min, the uniformly mixed materials are put into a dry ton bag discharging bag through a three-way valve, and are packaged according to 500Kg per packaging bag, tying an opening mark, warehousing for later use, sampling and detecting physical and chemical indexes (detection results are shown in table 3) of the semi-steel tank nozzle castable, and transporting the semi-steel tank nozzle castable to a Xichang steel vanadium cooperative building operation area after the semi-steel tank nozzle castable is detected to be qualified.
The semi-steel tank nozzle uses the pouring material of the semi-steel tank nozzle of this embodiment as the refractory pouring material, use two semi-steel tank nozzles in a certain steel mill, the pouring material quantity is 5 tons, from the construction to the data of the line collection of overhaul, two tank nozzle pouring materials construction conditions are good, all there is not the material that falls in the maintenance process, the crackle phenomenon takes place, the number of times of going up the line is improved to 373 times from original average 300 times, the line treatment sediment time average reduces to 45 minutes by 1h under the line is repaiied for a short time to the tank nozzle, and the fine protection tank nozzle steel casing of pouring material, corresponding deformation does not appear.
TABLE 3 example 1 physical and chemical detection index of semi-steel tank nozzle castable
Item The detection result is%
Al2O3，％ 77.5
Cr2O3，％ 1.75
SiO2，％ 17
Bulk density (110 deg.C)×24h)，g/cm3 3.08
Refractoriness, DEG C 1700
Compressive strength (1450 ℃ is multiplied by 3h), MPa 82
Normal temperature compression strength (110 ℃ for 24h), MPa 44
Normal temperature breaking strength (110 ℃ x 3h), MPa 4.3
Breaking strength at normal temperature (1450 deg.C x 3h), MPa 8.8
Linear rate of change (1450 ℃ C.. times.3 h)% -0.08
Example 2
23 parts by weight of 5mm-10mm corundum slag, 20 parts by weight of 2-5mm corundum slag, 11 parts by weight of 1-3mm flint clay, 11 parts by weight of 0.074mm-1mm flint clay are sent into a drum mixer to be mixed and stirred for 2min, 11 parts by weight of 0.074mm bauxite powder, 3 parts by weight of 0.074mm Guangxi white clay, 5 parts by weight of 0.005mm aluminum trioxide micropowder, 8 parts by weight of 0.074mm CA60 cement, 5 parts by weight of magnesium chromium brick powder, 3 parts by weight of 0.074mm silica fume and 0.1 part by weight of industrial grade sodium hexametaphosphate, 0.5 part by weight of stainless steel fiber and 0.03 part by weight of explosion-proof fiber are sent into the drum mixer to be mixed and stirred for 4min, the uniformly mixed materials are put into a dry ton bag through a three-way valve, and are packaged according to 500Kg per ton of packaging bag, tying an opening mark, warehousing for later use, sampling and detecting physical and chemical indexes (detection results are shown in a table 4) of the semi-steel tank nozzle castable, and transporting the semi-steel tank nozzle castable to a Xichang steel vanadium cooperative building operation area after the semi-steel tank nozzle castable is detected to be qualified.
The semi-steel tank nozzle uses the castable of the semi-steel tank nozzle of this embodiment as a refractory casting material, this send to the Xichang steel vanadium steel mill and repair the operation area in coordination, use at three semi-steel tank nozzle, the castable quantity is 7.5 tons, from the construction to the major repair line collection data, three tank nozzle castable construction conditions are good, all there is not the material that falls in the maintenance process, the crackle phenomenon takes place, the number of times of going up improves 362 from original average 300 times, the time of treating slag of the line is reduced to 40 minutes by 1h for the minor repair line of tank nozzle, and the fine protection tank nozzle steel casing of castable, corresponding deformation does not appear.
TABLE 4 EXAMPLE 2 physical and chemical detection indexes of castable for semisteel tank spout
Item The detection result is%
Al2O3，％ 78
Cr2O3，％ 1.53
SiO2，％ 16
Volume density (110 ℃ C.. times.24 h), g/cm3 2.99
Refractoriness, DEG C 1720
Compressive strength (1500 ℃ C.. times.3 h), MPa 73
Normal temperature compression strength (110 ℃ for 24h), MPa 39
Normal temperature breaking strength (110 ℃ x 3h), MPa 4.1
Normal temperature breaking strength (1500 ℃ x 3h), MPa 8.3
Linear rate of change (1500 ℃ C.. times.3 h)% -0.15
According to the background art of the invention and the contents of the embodiments 1 and 2, the following can be obtained: the castable for the semi-steel tank nozzle has the advantages of good application condition, good construction and obviously prolonged service cycle in the semi-steel tank nozzle, can improve the slag adhesion phenomenon in the application process, reduce the slag treatment time, reduce the labor intensity of steel shell treatment, and has wide application prospect.

Claims (2)

1. The semi-steel tank nozzle castable is characterized in that: comprises aggregate, powder, fiber and sodium hexametaphosphate, wherein the aggregate consists of corundum slag and flint clay, and the powder comprises Al2O3Micro powder, bauxite powder, Guangxi white mud, micro silicon powder, cement and magnesia chrome brick powder, wherein the aggregate accounts for 65-70% by mass, and the powder accounts for 30-33% by mass;
the cement is calcium aluminate A60 cement, and the fiber is stainless steel fiber and explosion-proof fiber;
the mass percentages of the components of the materials are 20-23% of corundum slag particles with the particle size of 5-10mm, 17-20% of corundum slag particles with the particle size of 2-5mm, 8-12% of flint clay particles with the particle size of 1-3mm, 9-11% of flint clay particles with the particle size of 0.074mm-1mm, 11-13% of bauxite powder with the particle size of 0.074mm, 1-3% of Guangxi white mud with the particle size of 0.074mm, 4-6% of aluminum oxide micropowder with the particle size of 0.005mm, 5-10% of cement with the particle size of 0.074mm, 1-3% of silicon dust powder with the particle size of 0.074mm, 4-6% of magnesium-chromium brick powder with the particle size of 0.074mm, 0.1% of industrial grade sodium hexametaphosphate, 0.5%.
2. The semi-steel tank nozzle castable of claim 1, wherein: the castable comprises the following chemical components in percentage by weight: al (Al)2O3≥40%，SiO2≥10%，Cr2O3≥1.5%。
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CN109516818A (en) * 2018-12-03 2019-03-26 攀枝花钢城集团有限公司 Hot-metal bottle bottom castable and preparation method thereof
CN110981449A (en) * 2019-12-17 2020-04-10 钢城集团凉山瑞海实业有限公司 Steel ladle pocket brick thermal-state repairing material and preparation method thereof
CN110790580A (en) * 2019-12-18 2020-02-14 钢城集团凉山瑞海实业有限公司 High-temperature-resistant anti-burning sleeper protection castable
CN112608129A (en) * 2020-12-09 2021-04-06 钢城集团凉山瑞海实业有限公司 Refractory material and preparation method thereof, high-temperature-resistant and burning-loss-preventing device for sleeper and preparation method thereof
CN112479726A (en) * 2020-12-09 2021-03-12 攀枝花钢城集团有限公司 Castable for electric furnace cover and preparation method thereof
CN112592193A (en) * 2021-03-02 2021-04-02 北京利尔高温材料股份有限公司 Ladle cover castable and preparation method thereof
CN114669733B (en) * 2022-04-07 2024-01-26 安徽工业大学 Method for repairing long-service-life hot-metal ladle nozzle

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