CN113233880A - Ladle castable for integral casting and preparation method thereof - Google Patents
Ladle castable for integral casting and preparation method thereof Download PDFInfo
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- CN113233880A CN113233880A CN202110592251.3A CN202110592251A CN113233880A CN 113233880 A CN113233880 A CN 113233880A CN 202110592251 A CN202110592251 A CN 202110592251A CN 113233880 A CN113233880 A CN 113233880A
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- spinel
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- castable
- integral casting
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- 238000005266 casting Methods 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 229910052593 corundum Inorganic materials 0.000 claims abstract description 25
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 25
- 239000011029 spinel Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 24
- 239000002994 raw material Substances 0.000 claims abstract description 23
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000010431 corundum Substances 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 9
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 6
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 20
- 239000000203 mixture Substances 0.000 claims description 11
- 239000002245 particle Substances 0.000 claims description 11
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- 229910052681 coesite Inorganic materials 0.000 claims description 8
- 229910052906 cristobalite Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229910052682 stishovite Inorganic materials 0.000 claims description 8
- 229910052905 tridymite Inorganic materials 0.000 claims description 8
- 239000010419 fine particle Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 7
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims description 6
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 6
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical group [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 3
- 239000004568 cement Substances 0.000 claims description 3
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 229910021487 silica fume Inorganic materials 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims 2
- 239000011819 refractory material Substances 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 3
- 239000002893 slag Substances 0.000 abstract description 3
- 230000007797 corrosion Effects 0.000 abstract description 2
- 238000005260 corrosion Methods 0.000 abstract description 2
- 230000035699 permeability Effects 0.000 abstract description 2
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 12
- 229910000831 Steel Inorganic materials 0.000 description 9
- 239000010959 steel Substances 0.000 description 9
- 239000000395 magnesium oxide Substances 0.000 description 6
- 238000010276 construction Methods 0.000 description 3
- 239000002270 dispersing agent Substances 0.000 description 3
- 229910052566 spinel group Inorganic materials 0.000 description 3
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- C04B35/10—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- 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
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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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
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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
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3208—Calcium oxide or oxide-forming salts thereof, e.g. lime
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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
- 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)
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- 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
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- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
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- 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
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- 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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Abstract
The invention relates to the technical field of refractory materials, in particular to a ladle castable for integral casting and a preparation method thereof. The castable comprises the following raw materials in parts by weight: 20-30% of white corundum, 34-55.34% of tabular corundum, 22-29% of spinel, 3-10% of alumina micro powder, 2-10% of binding agent, 0.1-1% of water reducing agent and 0.01-0.1% of explosion-proof agent. The compactness of the working lining after the pouring material is poured is obviously improved, the better slag corrosion resistance and the better permeability are reflected, and the service life of the whole ladle is greatly prolonged and improved. The invention can improve the thermal shock resistance of the castable for the ladle integral casting working lining.
Description
Technical Field
The invention relates to the technical field of refractory materials, in particular to a ladle castable for integral casting and a preparation method thereof.
Background
In recent years, with the increasing of smelting steel grades, the low-cost operation of steel plants is promoted continuously, and the application of the unshaped refractory material becomes wider and wider. The steel ladle integral casting has the advantages that the steel ladle integral casting does not carburete molten steel, the construction is simple and efficient, the casting material has good heat insulation effect in the using process, and the continuous casting can obviously reduce the material consumption and the production cost, so that the product is about to become the inevitable trend of the development of the refractory material for the steel ladle.
At present, corundum or alumina is used as an aggregate for most of large and medium ladle castable working liners, spinel fine powder is used as a matrix, and the castable has high expansibility at a certain temperature and is easy to peel off in a long-time high-temperature use process. Some casting materials are added with fine-particle magnesia and magnesia fine powder, so that when spinel is generated in situ, the magnesia can accelerate the hardening speed of the casting materials, great influence is generated on casting construction, the water addition amount of the casting materials is obviously improved, the strength is inevitably reduced, and the molten steel scouring resistance is reduced.
Disclosure of Invention
In view of the above disadvantages and shortcomings of the prior art, the present invention provides a ladle castable for integral casting and a preparation method thereof, which solves the technical problems that the castable is easy to peel off during long-term high-temperature use, the strength of the castable is low, and the like.
In order to achieve the purpose, the invention adopts the main technical scheme that:
in a first aspect, the invention provides a ladle castable for integral casting, which comprises the following raw materials in parts by weight: 20-30% of white corundum, 34-55.34% of tabular corundum, 22-29% of spinel, 3-10% of alumina micro powder, 2-10% of binding agent, 0.1-1% of water reducing agent and 0.01-0.1% of explosion-proof agent. In the invention, the water reducing agent is one of polycarboxylic acid dispersant, phosphate dispersant and FDN type naphthalene college dispersant. The explosion-proof agent is organic fiber, the melting point is lower than 110 ℃, and the length is less than 6 mm.
Further, the ladle castable comprises the following raw materials in parts by weight: 20-25% of white corundum, 35-50% of tabular corundum, 22-25% of spinel, 3-5% of alumina micro powder, 2-3% of binding agent, 0.1-0.5% of water reducing agent and 0.05-0.1% of explosion-proof agent.
Further, the plate corundum comprises the following components: the plate-shaped corundum with the granularity of more than 3mm and less than or equal to 5mm accounts for 5-15% of the total mass of the raw materials, the plate-shaped corundum with the granularity of more than 1mm and less than or equal to 3mm accounts for 5-20% of the total mass of the raw materials, and the plate-shaped corundum with the granularity of more than 0mm and less than or equal to 1mm accounts for 15-25% of the total mass of the raw materials.
Further, the spinel comprises the following components: 90 spinel fine particles with the particle size of more than 0.15mm and less than or equal to 1.0mm account for 2-7% of the total mass of the raw materials, 90 spinel fine particles with the particle size of more than 0mm and less than or equal to 0.3mm account for 2-7% of the total mass of the raw materials, 76 spinel fine powder with the particle size of 100 meshes accounts for 3-10% of the total mass of the raw materials, 76 spinel fine powder with the particle size of 325 meshes accounts for 3-10% of the total mass of the raw materials, and 80 spinel ultra-fine powder with the particle size of 800 meshes accounts for 0-7% of the total mass of.
Further, in the 90 spinel fine particles, Al2O3≥89％，MgO≤10％，Fe2O3≤0.2％，SiO2≤0.2％，Na2O≤0.4％。
Further, in the 76 spinel fine powder, Al is contained2O3≥75％，MgO≤25％，Fe2O3≤0.3％，SiO2≤0.3％，Na2O≤0.4％。
Further, in 80 spinel ultra-fine powder, Al2O3≥79％，MgO≤19％，Fe2O3≤0.2％，SiO2≤0.2％，Na2O≤0.4％。
Furthermore, the alumina micro powder is one or the mixture of calcined alumina micro powder and active alumina micro powder, and the granularity of the alumina micro powder is less than or equal to 5 um.
Further, the binder is a mixture of calcium aluminate cement, Al in which is present, and 951U of silica fume2O3Not less than 69 percent and not more than 30 percent of CaO; in silica fume, SiO2≥97％。
In a second aspect, the invention provides a preparation method of a ladle castable for integral casting, which comprises the following steps: the raw materials in the ladle castable are prepared according to a certain proportion; after the mixture is prepared, dry mixing is carried out for 2-3 minutes to obtain a dry mixture; then adding 3-8% of water into the dry mixture, and continuously carrying out wet mixing and stirring for 3-5 minutes to obtain a castable for pouring the ladle wall; in the wet mixing process, the vibrating rod is inserted into the wet mixed material and slowly moves, and the vibrating rod is inclined at a certain angle and slowly pulled out.
The invention has the beneficial effects that: compared with the prior art, the ladle castable for integral casting and the preparation method thereof have the advantages that spinels with different grades are filled in the castable, the spinels with different grades have different expansion coefficients in the whole long-term high-temperature use process, micro expansion is realized in a large temperature range, part of stress is reduced, and when the castable is subjected to rapid cooling and rapid heating, cracks generated penetrate through a matrix and are partially blocked by the micro cracks, so that the thermal shock resistance of the castable for the integral casting working lining of the ladle is obviously improved. Meanwhile, the stacking density of spinels with different particle sizes is improved to a certain extent, the compactness of a poured working lining is also obviously improved, better slag corrosion resistance and permeability are reflected, and the service life of the whole ladle is prolonged and improved to a greater extent.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention by way of specific embodiments thereof.
The detailed data of the various embodiments of the invention are shown in the following table:
the concrete steps of pouring the ladle wall working layer are as follows: the preparation method comprises the steps of mixing the raw materials according to a certain proportion, dry-mixing for 2-3 minutes to obtain a dry mixture, adding water into the mixed dry mixture according to a certain proportion, controlling the water addition amount to be 3-8%, continuously carrying out wet mixing and stirring for 3-5 minutes to obtain a castable, and finally discharging and pouring the castable to a ladle wall. In the wet mixing process, the vibrating rod needs to move slowly after being inserted, and needs to incline at a certain angle and slow when being extracted, so that a cavity is avoided. And in the pouring process, the pouring is stopped when the slag line is required to be poured. Naturally curing until the surface of the ladle wall is hardened, and demoulding after the demoulding strength is reached. The demolding time is determined by the temperature at the time, and demolding can be carried out after 12 hours generally. And naturally curing for more than 48 hours after the construction of the ladle is finished. And (4) baking the steel ladle strictly according to a baking curve after natural curing, and baking the steel ladle by using a gas roaster at the stages of small fire, medium fire and large fire. After reaching the temperature, the material is put into use.
The performance of the various embodiments of the invention is shown in the following table:
as can be seen from the data in the table above, the ladle monolithic castable prepared by the invention has very good use strength and thermal shock performance, and the service life is greatly prolonged.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The ladle castable for integral casting is characterized in that: the composite material comprises the following raw materials in parts by weight: 20-30% of white corundum, 34-55.34% of tabular corundum, 22-29% of spinel, 3-10% of alumina micro powder, 2-10% of binding agent, 0.1-1% of water reducing agent and 0.01-0.1% of explosion-proof agent.
2. The ladle castable for integral casting according to claim 1, wherein: the composite material comprises the following raw materials in parts by weight: 20-25% of white corundum, 35-50% of tabular corundum, 22-25% of spinel, 3-5% of alumina micro powder, 2-3% of binding agent, 0.1-0.5% of water reducing agent and 0.05-0.1% of explosion-proof agent.
3. The ladle castable for integral casting according to claim 1 or 2, characterized in that: the plate corundum comprises the following components: the plate-shaped corundum with the granularity of more than 3mm and less than or equal to 5mm accounts for 5-15% of the total mass of the raw materials, the plate-shaped corundum with the granularity of more than 1mm and less than or equal to 3mm accounts for 5-20% of the total mass of the raw materials, and the plate-shaped corundum with the granularity of more than 0mm and less than or equal to 1mm accounts for 15-25% of the total mass of the raw materials.
4. The ladle castable for integral casting according to claim 1 or 2, characterized in that: the spinel comprises the following components: 90 spinel fine particles with the particle size of more than 0.15mm and less than or equal to 1.0mm account for 2-7% of the total mass of the raw materials, 90 spinel fine particles with the particle size of more than 0mm and less than or equal to 0.3mm account for 2-7% of the total mass of the raw materials, 76 spinel fine powder with the particle size of 100 meshes accounts for 3-10% of the total mass of the raw materials, 76 spinel fine powder with the particle size of 325 meshes accounts for 3-10% of the total mass of the raw materials, and 80 spinel ultra-fine powder with the particle size of 800 meshes accounts for 0-7% of the total mass of the raw materials.
5. The ladle castable for integral casting according to claim 4, wherein: in fine particles of 90 spinel, Al2O3≥89％，MgO≤10％，Fe2O3≤0.2％，SiO2≤0.2％，Na2O≤0.4％。
6. The ladle castable for integral casting according to claim 4, wherein: 76 fine powder of spinel, Al2O3≥75％，MgO≤25％，Fe2O3≤0.3％，SiO2≤0.3％，Na2O≤0.4％。
7. The ladle castable for integral casting according to claim 4, wherein: in 80 spinel micropowder, Al2O3≥79％，MgO≤19％，Fe2O3≤0.2％，SiO2≤0.2％，Na2O≤0.4％。
8. The ladle castable for integral casting according to claim 1 or 2, characterized in that: the alumina micro powder is one or a mixture of calcined alumina micro powder and activated alumina micro powder, and the granularity of the alumina micro powder is less than or equal to 5 um.
9. The ladle castable for integral casting according to claim 1 or 2, characterized in that: the binder is calcium aluminate cement and 951U silica fumeMixture of calcium aluminate cement, Al2O3Not less than 69 percent and not more than 30 percent of CaO; in silica fume, SiO2≥97％。
10. A preparation method of a ladle castable for integral casting is characterized by comprising the following steps: the method comprises the following steps: proportioning the raw materials in the ladle castable according to any one of claims 1-9; after the mixture is prepared, dry mixing is carried out for 2-3 minutes to obtain a dry mixture; then adding 3-8% of water into the dry mixture, and continuously carrying out wet mixing and stirring for 3-5 minutes to obtain a castable for pouring the ladle wall; in the wet mixing process, the vibrating rod is inserted into the wet mixed material and slowly moves, and the vibrating rod is inclined at a certain angle and slowly pulled out.
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Application publication date: 20210810 |