CN111777409A - Brick for molten iron ladle with high slag corrosion resistance and preparation method thereof - Google Patents
Brick for molten iron ladle with high slag corrosion resistance and preparation method thereof Download PDFInfo
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- CN111777409A CN111777409A CN202010666323.XA CN202010666323A CN111777409A CN 111777409 A CN111777409 A CN 111777409A CN 202010666323 A CN202010666323 A CN 202010666323A CN 111777409 A CN111777409 A CN 111777409A
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- brick
- corrosion resistance
- ladle
- high slag
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- 239000011449 brick Substances 0.000 title claims abstract description 82
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 73
- 239000002893 slag Substances 0.000 title claims abstract description 55
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 36
- 230000007797 corrosion Effects 0.000 title claims abstract description 35
- 238000005260 corrosion Methods 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title abstract description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 239000004927 clay Substances 0.000 claims abstract description 29
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 29
- 229910052849 andalusite Inorganic materials 0.000 claims abstract description 27
- 229910052596 spinel Inorganic materials 0.000 claims abstract description 26
- 239000011029 spinel Substances 0.000 claims abstract description 26
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 13
- 230000003628 erosive effect Effects 0.000 claims abstract description 12
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 8
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 8
- 238000005245 sintering Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 60
- 239000000463 material Substances 0.000 claims description 35
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 17
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 16
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 16
- 239000000843 powder Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- 239000011230 binding agent Substances 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 8
- 229940105963 yttrium fluoride Drugs 0.000 claims description 8
- RBORBHYCVONNJH-UHFFFAOYSA-K yttrium(iii) fluoride Chemical group F[Y](F)F RBORBHYCVONNJH-UHFFFAOYSA-K 0.000 claims description 8
- 229910052570 clay Inorganic materials 0.000 claims description 4
- 239000012047 saturated solution Substances 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000011819 refractory material Substances 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 3
- 238000007254 oxidation reaction Methods 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical group O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 16
- 229910052863 mullite Inorganic materials 0.000 description 16
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 14
- 230000002829 reductive effect Effects 0.000 description 9
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 238000001035 drying Methods 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 229910052593 corundum Inorganic materials 0.000 description 6
- 238000006477 desulfuration reaction Methods 0.000 description 6
- 230000023556 desulfurization Effects 0.000 description 6
- 229910001845 yogo sapphire Inorganic materials 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 229910052681 coesite Inorganic materials 0.000 description 5
- 229910052906 cristobalite Inorganic materials 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 229910052682 stishovite Inorganic materials 0.000 description 5
- 229910052905 tridymite Inorganic materials 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000010304 firing Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 239000011863 silicon-based powder Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052783 alkali metal Inorganic materials 0.000 description 2
- 150000001340 alkali metals Chemical class 0.000 description 2
- 238000001354 calcination Methods 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 229910001634 calcium fluoride Inorganic materials 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 230000005496 eutectics Effects 0.000 description 2
- 238000003837 high-temperature calcination Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 229910002808 Si–O–Si Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000005354 aluminosilicate glass Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- DUEPRVBVGDRKAG-UHFFFAOYSA-N carbofuran Chemical compound CNC(=O)OC1=CC=CC2=C1OC(C)(C)C2 DUEPRVBVGDRKAG-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000011451 fired brick Substances 0.000 description 1
- 108010025899 gelatin film Proteins 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
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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
- C04B35/103—Refractories from grain sized mixtures containing non-oxide refractory materials, e.g. carbon
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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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- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/6303—Inorganic additives
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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
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
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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
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63416—Polyvinylalcohols [PVA]; Polyvinylacetates
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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)
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3224—Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
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- 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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- C04B2235/30—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
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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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
- C04B2235/38—Non-oxide ceramic constituents or additives
- C04B2235/3817—Carbides
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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
- C04B2235/40—Metallic constituents or additives not added as binding phase
- C04B2235/402—Aluminium
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- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
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- C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
- C04B2235/9669—Resistance against chemicals, e.g. against molten glass or molten salts
- C04B2235/9676—Resistance against chemicals, e.g. against molten glass or molten salts against molten metals such as steel or aluminium
Abstract
The invention particularly relates to a brick for a ladle with high slag corrosion resistance and a preparation method thereof, belonging to the technical field of refractory materials, wherein the brick for the ladle comprises a component A, and the component A comprises the following substances in percentage by mass: 30-60% of flint clay, 10-30% of andalusite, 5-10% of aluminum-rich spinel, 6-16% of silicon carbide, 1-8% of sintering aid and 1-4% of antioxidant. The brick for the high slag corrosion resistant ladle provided by the embodiment of the invention has the characteristics of high density, low porosity, high strength, high slag corrosion resistance and the like, and under the same temperature and slag iron corrosion conditions, the thickness of an erosion layer and an oxidation layer of the high slag corrosion resistant brick is only 1/5-1/3 of the traditional ladle brick, so that the service life of the ladle can be greatly prolonged, and safety accidents such as iron leakage and the like caused by slag corrosion and brick stripping are prevented.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a brick for a molten iron ladle with high slag corrosion resistance and a preparation method thereof.
Background
The ladle is a kind of transport equipment of molten iron, mainly transport the blast furnace molten iron to the converter or mixer, with the improvement and development of the steel-making process, sometimes the ladle will also undertake the pretreatment task of molten iron, mainly carry on the desulfurization to the molten iron, generally adopt KR desulfurization method, namely insert the molten iron with the mixing head, add the desulfurizer while rotating and stirring, the principal ingredients of the desulfurizer are CaO and CaF2. After the desulfurization is finished, a large amount of desulfurization slag is generated in the ladle, and the molten iron can be added into the converter for continuous steelmaking only by completely scraping off the surface of the molten iron. The removed desulfurized slag contains a large amount of iron elements, which are called desulfurized slag iron. In order to recover iron in the desulfurized slag iron, some steel mills put part of the desulfurized slag iron after simple treatment into an empty ladle after molten iron is added, and put approximately 2-3t of slag iron at a time. Because the desulfurization rate of part of steel mills is high and even reaches 100 percent, namely, each ladle of molten iron can be removedAnd the generated part of desulfurized iron slag is put into the foundry ladle for recycling, thereby causing great test on the traditional foundry ladle refractory. Such as Al2O3the-SiC-C unburned brick, CaO and CaF2 in the desulfurizer and Al2O3And SiO2The reaction forms a low melting point phase, and the desulfurized slag iron contains a large amount of Fe oxides which react with C and SiC in the refractory to generate CO or CO2The structure of the brick body is seriously damaged, the strength of the brick is greatly reduced, and the brick can be damaged.
Chinese patent 200710040413.2 discloses an alumina-based andalusite-SiC-C brick, a manufacturing method and application thereof, the brick is characterized in that andalusite with two specifications is introduced into the components, secondary mullite reaction is carried out in the using process to form a mullite network frame, the middle and high temperature physical properties of the material are improved, the melting loss of an impact zone is reduced, and the propagation of wall cracks is inhibited, but when a molten iron pretreatment process is adopted in a molten iron ladle, the corrosion rate of the brick tends to increase.
Chinese patent 201410804022.3 discloses a refractory material for foundry ladle and a preparation method thereof, wherein the brick adopts flint clay, andalusite and silicon carbide as main raw materials, the combination of mullite polycrystalline aggregates generated by calcining the andalusite and the mineral phase of the flint clay presents a multiphase non-homogeneous system on the microstructure, the volume stability of the brick at high temperature can be ensured, and the multiphase structure is helpful for improving the thermal stability of the material. However, SiC contained in the silicon carbide can be oxidized by a large amount of FeO in the desulfurized slag iron, so that the performance of the silicon carbide is deteriorated; and because the brick has high porosity and poor density, the volume density is generally less than or equal to 2.3g/cm3The molten iron impact resistance and slag penetration resistance are relatively weak, and the method is not suitable for ladles with high desulfurization rate and needing to recover desulfurized slag iron.
Disclosure of Invention
In view of the above problems, the present invention has been made to provide a brick for a ladle having high resistance to slag erosion and a method of manufacturing the same, which overcome or at least partially solve the above problems.
The embodiment of the invention provides a brick for a ladle with high slag corrosion resistance, which comprises a component A, wherein the component A comprises the following substances in parts by mass:
flint clay 30-60%
Andalusite accounting for 10 to 30 percent
5 to 10 percent of aluminum-rich spinel
6 to 16 percent of silicon carbide
1 to 8 percent of combustion improver
1-4% of antioxidant.
Optionally, the flint clay comprises, by particle size and mass fraction:
30 to 35 percent of flint clay particles with the granularity of 3 to 1mm,
8-28% of flint clay particles with the particle size less than or equal to 1 mm.
Optionally, the andalusite includes, by particle size and mass fraction:
10 to 28 percent of andalusite particles with the particle size less than or equal to 1mm,
andalusite powder with a particle size of-200 meshes is 7-15%.
Optionally, the silicon carbide includes, by particle size and mass fraction:
6 to 10 percent of silicon carbide particles with the particle size less than or equal to 1mm,
10-16% of silicon carbide fine powder with the granularity of-200 meshes.
Optionally, the aluminum-rich spinel comprises the following components in percentage by particle size and mass:
1 to 4 percent of spinel particles with the particle size less than or equal to 1mm,
the spinel fine powder with the granularity of-200 meshes is 2-7%.
Optionally, the brick for ladles further comprises a component B, wherein the component B is: the weight of the binding agent and the additive is respectively 3-6% and 1-3% of the total weight of the component A.
Optionally, the binder comprises silica sol and PVA, and the mass ratio of the silica sol to the PVA is 3-5: 1-3.
Optionally, SiO in the silica sol2The mass fraction of the PVA is 25-40%, the pH value of the silica sol is 9-10.5, and the PVA is a saturated solution of polyvinyl alcohol.
Optionally, the additive is yttrium fluoride, and the particle size of the yttrium fluoride is 1-2 μm.
Based on the same invention concept, the embodiment of the invention also provides a preparation method of the brick for the molten iron ladle with high slag corrosion resistance, which is characterized by comprising the following steps:
mixing the flint clay, andalusite, silicon carbide and the aluminum-rich spinel according to the mass fraction ratio, and stirring for 10-20min to obtain a first material;
mixing the sintering aid, the antioxidant, the binding agent and the additive according to the mass fraction ratio, and stirring for 5-8min to obtain a second material;
mixing and stirring the first material and the second material for 10-20min to obtain a third material;
and placing the third material under the pressure of 50-150MPa to press a Wei brick blank, and placing the brick blank at the temperature of 1100-1300 ℃ to fire for 5-8h to obtain the brick for the ladle with high resistance to slag corrosion.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
the brick for the high slag corrosion resistant ladle provided by the embodiment of the invention has the characteristics of high density, low porosity, high strength, high slag corrosion resistance and the like, and under the same temperature and slag iron corrosion conditions, the thickness of an erosion layer and an oxidation layer of the high slag corrosion resistant brick is only 1/5-1/3 of the traditional ladle brick, so that the service life of the ladle can be greatly prolonged, and safety accidents such as iron leakage and the like caused by slag corrosion and brick stripping are prevented.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, 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. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
according to an exemplary embodiment of the invention, a brick for a ladle with high resistance to slag erosion is provided, which comprises a component A, wherein the component A comprises the following substances in parts by mass:
flint clay 30-60%
Andalusite accounting for 10 to 30 percent
5 to 10 percent of aluminum-rich spinel
6 to 16 percent of silicon carbide
1 to 8 percent of combustion improver
1-4% of antioxidant.
The respective effects of the above-mentioned component A are generally as follows:
flint clay: here, used are particles of calcined flint clay, Fe, obtained by calcining flint clay raw ore at high temperature2O3And other alkali metal impurities are low in content, the refractory brick has the characteristics of stable volume, high strength, low water absorption and the like, is wide in source and low in price, and can be used as a main particle source of the refractory brick.
Andalusite: mullite is easily formed during high-temperature calcination and is accompanied by 3-5.4% volume expansion, the shrinkage of low-melting substances such as alkali metals in the raw materials under high-temperature conditions can be compensated, and the expansion of the refractory material can be homogenized by a mullite interconnection structure formed during the high-temperature calcination.
Silicon carbide: can improve the high temperature index and the erosion resistance of the material.
Aluminum-rich spinel: can react with FeO in the slag at high temperature to form (Mg, Fe) Al2O4The composite spinel reduces the oxidation of FeO to SiC, thereby weakening the corrosion of slag to a sample. As the slag permeates into the brick, the aluminum-rich spinel can react with CaO in the slag to generate CA6And CA2The viscosity of the slag is increased, and the permeability of the slag is reduced, so that the slag permeation resistance of the material is improved.
A sintering aid: because the mullite is difficult to sinter, after the silicon micropowder and the alpha-Al 2O3 micropowder are added, an in-situ mullite reaction zone distributed around the particles is formed at the joint of the raw material particles and the matrix, and the particles and the matrix are combined into a whole to promote sintering.
An antioxidant: the metal silicon powder or aluminum powder can prevent oxygen in the air or iron oxide in the slag from reacting with SiC in the brick, so that the SiC is gradually consumed, the material structure becomes loose, and the corrosion resistance is poor.
As some optional embodiments, the flint clay comprises, by grain size and mass fraction:
30 to 35 percent of flint clay particles with the granularity of 3 to 1mm,
8-28% of flint clay particles with the particle size less than or equal to 1 mm.
As some optional embodiments, the andalusite comprises, in terms of particle size and mass fraction:
10 to 28 percent of andalusite particles with the particle size less than or equal to 1mm,
andalusite powder with a particle size of-200 meshes is 7-15%.
As some optional embodiments, the silicon carbide comprises, in terms of particle size and mass fraction:
6 to 10 percent of silicon carbide particles with the particle size less than or equal to 1mm,
10-16% of silicon carbide fine powder with the granularity of-200 meshes.
As some optional embodiments, the aluminum-rich spinel comprises, in terms of particle size and mass fraction:
1 to 4 percent of spinel particles with the particle size less than or equal to 1mm,
the spinel fine powder with the granularity of-200 meshes is 2-7%.
The reasons for the particle size and the mass fraction of the flint clay, the andalusite, the silicon carbide and the aluminum-rich spinel are as follows: and a secondary-grade-granularity burdening structure is adopted, so that the particles are tightly stacked, and the density of the finished brick is increased.
As some optional embodiments, the brick for ladles further comprises a component B, wherein the component B is: the weight of the binding agent and the additive is respectively 3-6% and 1-3% of the total weight of the component A.
The mixture and the additive have the following functions:
binding agent: silica sol and Al2O3When the fine powder is mixed, the colloidal particles can be adsorbed on Al2O3The particles form a single-layer saturated distribution on the surface and are filled with Al2O3The particles have good dispersion and permeability because of the gaps among the particles. The colloid particles are combined by chemical bonds (Si-O-Si) through drying or sintering treatment to form a stable space network structure, and Al is added2O3The particles are firmly bonded together and in Al2O3The surface of the particles forms a nano-coated micro-composite structure. Meanwhile, the silica sol covers the surface of the solid to form a firm silica gel film, so that the bonding, curing and forming of the material are enhanced. In addition, the high reactivity of the silica sol can promote the synthesis of mullite, and the early-stage formed mullite is Al-treated in the later stage2O3Micropowder and SiO2The micro powder plays a role of crystal nucleus when the mullite is synthesized by the reaction, and the synthesis of the mullite is further promoted, so the temperature for finishing the mullite reaction can be reduced by the silica sol, and the brick body is more compact. The PVC saturated solution mainly has the function of enhancing the plasticity of the mixed material and is more beneficial to machine pressing forming.
Additive: YF3Easily harmonize Al in the material2O3And SiO2Generating Y2O3-Al2O3-SiO2The structure can be lower than Al2O3-SiO2At the temperature of structure formation, metastable eutectic is formed, so at lower temperaturesAt temperature, an aluminosilicate glass phase is formed, alumina dissolves therein, mullite is formed, so YF3The formation temperature of the mullite can be further reduced, so that the temperature of the carbofuran is reduced, the energy is saved, and the consumption is reduced. In addition, due to the appearance of a low-viscosity metastable eutectic liquid phase, the liquid phase flows into gaps in the matrix to different degrees, and the original gaps are filled, so that the porosity is reduced, and the brick body is more compact.
As some alternative embodiments, the binding agent comprises silica sol and PVA, and the mass ratio of the silica sol to the PVA is 3-5: 1-3.
As some optional embodiments, SiO in the silica sol2The mass fraction of the PVA is 25-40%, the pH value of the silica sol is 9-10.5, and the PVA is a saturated solution of polyvinyl alcohol.
In some alternative embodiments, the additive is yttrium fluoride having a particle size of 1-2 μm.
Based on the same invention concept, the embodiment of the invention also provides a preparation method of the brick for the molten iron ladle with high slag corrosion resistance, which is characterized by comprising the following steps:
mixing the flint clay, andalusite, silicon carbide and the aluminum-rich spinel according to the mass fraction ratio, and stirring for 10-20min to obtain a first material;
mixing the sintering aid, the antioxidant, the binding agent and the additive according to the mass fraction ratio, and stirring for 5-8min to obtain a second material;
mixing and stirring the first material and the second material for 10-20min to obtain a third material;
and (3) placing the third material under the pressure of 50-150MPa to be pressed into a green brick, and placing the green brick at the temperature of 1100-1300 ℃ to be fired for 5-8h to obtain the brick for the ladle with high slag corrosion resistance.
The raw materials are stirred step by step to improve the uniformity of the raw material mixing and the density of the brick blank, the conventional mullite fired brick needs to be fired at the temperature of more than 1350 ℃, and the firing temperature can be reduced to 1100-1300 ℃ by using the bonding agent and the additive, so that the purposes of saving energy and reducing consumption are achieved.
The brick for a ladle having high resistance to slag corrosion and the method for manufacturing the same will be described in detail with reference to examples, comparative examples and experimental data.
Example 1:
the embodiment provides a brick for a high-erosion-resistance ladle, which is prepared from the following components in percentage by weight: 30 wt% of flint clay with the granularity of 3-1mm, 12 wt% of flint clay with the granularity of 1-0mm, 16 wt% of andalusite with the granularity of 1-0mm, 8 wt% of andalusite with the granularity of-200 meshes, 3 wt% of alumina-rich spinel with the granularity of 1-0mm, 4 wt% of alumina-rich spinel with the granularity of-200 meshes, 7 wt% of silicon carbide with the granularity of 1-0mm and 12 wt% of silicon carbide with the granularity of-200 meshes, putting the raw materials into a conical mixing device, and mixing for 15 minutes for later use.
2 wt% of silicon micro powder with the granularity of 10 mu, 4 wt% of alpha-Al 2O3 micro powder with the granularity of 5 mu, 2 wt% of metal aluminum powder with the granularity of-200 meshes, 4 wt% of silica sol, 1 wt% of PVA and 2 wt% of yttrium fluoride are put into a linear mixer and stirred for 5 minutes;
and adding the mixed materials in the conical mixed materials into a stirrer, and continuously stirring for 15 minutes. Pressing the obtained material into green bricks by using a brick press, wherein the forming pressure is 100 MPa; the green brick is sent into a drying chamber for electric heating drying for 48 hours at the temperature of 110 ℃ and cooled along with the furnace. And firing the obtained green brick at 1200 ℃ for 6 hours to obtain the brick for the molten iron ladle with high slag corrosion resistance.
The volume density of the brick is detected to be 2.81g/cm 3; the apparent porosity was 12.2%, and the compressive strength was 82 MPa. After the static crucible erosion test, the infiltration eroded 1/4 to a thickness of Al2O3-SiC-C brick.
Example 2:
the embodiment provides a brick for a high-erosion-resistance ladle, which is prepared from the following components in percentage by weight: 32 wt% of flint clay with the granularity of 3-1mm, 10 wt% of flint clay with the granularity of 1-0mm, 15 wt% of andalusite with the granularity of 1-0mm, 9 wt% of andalusite with the granularity of-200 meshes, 4 wt% of alumina-rich spinel with the granularity of 1-0mm, 4 wt% of alumina-rich spinel with the granularity of-200 meshes, 6 wt% of silicon carbide with the granularity of 1-0mm and 12 wt% of silicon carbide with the granularity of-200 meshes are put into a conical mixing device and mixed for 15 minutes for later use.
3 wt% of silicon powder with the particle size of 10 mu, 3 wt% of alpha-Al 2O3 powder with the particle size of 5 mu, 1 wt% of metal aluminum powder with the particle size of-200 meshes, 1 wt% of metal silicon powder with the particle size of-200 meshes, 4 wt% of silica sol, 2 wt% of PVA and 1 wt% of yttrium fluoride are put into a quantitative stirrer and stirred for 5 minutes;
and adding the mixed materials in the conical mixed materials into a stirrer, and continuously stirring for 15 minutes. Pressing the obtained material into green bricks by using a brick press, wherein the forming pressure is 120 MPa; the green brick is sent into a drying chamber for electric heating drying for 48 hours at the temperature of 110 ℃ and cooled along with the furnace. And firing the obtained green brick at 1150 ℃ for 7 hours to obtain the brick for the molten iron ladle with high slag corrosion resistance.
The volume density of the brick is detected to be 2.85g/cm 3; the apparent porosity was 11.5%, and the compressive strength was 90 MPa. After the static crucible erosion test, the infiltration erosion thickness was 1/5 of the clay brick for ladles.
Example 3:
the embodiment provides a brick for a high-erosion-resistance ladle, which is prepared from the following components in percentage by weight: 30 wt% of flint clay with the granularity of 3-1mm, 16 wt% of flint clay with the granularity of 1-0mm, 12 wt% of andalusite with the granularity of 1-0mm, 10 wt% of andalusite with the granularity of-200 meshes, 2 wt% of alumina-rich spinel with the granularity of 1-0mm, 5 wt% of alumina-rich spinel with the granularity of-200 meshes, 8 wt% of silicon carbide with the granularity of 1-0mm and 10 wt% of silicon carbide with the granularity of-200 meshes, putting the raw materials into a conical mixing device, and mixing for 15 minutes for later use.
2 wt% of silicon micro powder with the granularity of 10 mu, 3 wt% of alpha-Al 2O3 micro powder with the granularity of 5 mu, 2 wt% of metal aluminum powder with the granularity of-200 meshes, 3 wt% of silica sol, 2 wt% of PVA2wt and 2 wt% of yttrium fluoride are put into a slide-type stirrer and stirred for 8 minutes;
and adding the mixed materials in the conical mixed materials into a stirrer, and continuously stirring for 20 minutes. Pressing the obtained material into green bricks by using a brick press, wherein the forming pressure is 100 MPa; the green brick is sent into a drying chamber for electric heating drying for 48 hours at the temperature of 110 ℃ and cooled along with the furnace. And firing the obtained green brick at 1250 ℃ for 8 hours to obtain the brick for the molten iron ladle with high slag corrosion resistance.
The volume density of the brick is detected to be 2.88g/cm 3; the apparent porosity was 11.2%, and the compressive strength was 89 MPa. After the static crucible erosion test, the infiltration erosion thickness was 1/3 for the mullite brick for ladles.
Finally, it should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The brick for the ladle with high slag corrosion resistance is characterized by comprising a component A, wherein the component A comprises the following substances in parts by mass:
flint clay 30-60%
Andalusite accounting for 10 to 30 percent
5 to 10 percent of aluminum-rich spinel
6 to 16 percent of silicon carbide
1 to 8 percent of combustion improver
1-4% of antioxidant.
2. The brick for the molten iron ladle with high slag corrosion resistance according to claim 1, wherein the flint clay comprises the following components in percentage by weight according to the granularity:
30 to 35 percent of flint clay particles with the granularity of 3 to 1mm,
8-28% of flint clay particles with the particle size less than or equal to 1 mm.
3. The brick for ladles with high slag corrosion resistance according to claim 1, wherein the andalusite comprises the following components in percentage by weight according to the granularity:
10 to 28 percent of andalusite particles with the particle size less than or equal to 1mm,
andalusite powder with a particle size of-200 meshes is 7-15%.
4. The brick for ladles with high slag corrosion resistance as claimed in claim 1, wherein the silicon carbide comprises the following components in percentage by weight according to particle size:
6 to 10 percent of silicon carbide particles with the particle size less than or equal to 1mm,
10-16% of silicon carbide fine powder with the granularity of-200 meshes.
5. The brick for ladles with high slag corrosion resistance as claimed in claim 1, wherein the aluminum-rich spinel comprises the following components in percentage by weight and particle size:
1 to 4 percent of spinel particles with the particle size less than or equal to 1mm,
the spinel fine powder with the granularity of-200 meshes is 2-7%.
6. The brick for ladles with high slag corrosion resistance according to claim 1, further comprising a component B, wherein the component B is: the weight of the binding agent and the additive is respectively 3-6% and 1-3% of the total weight of the component A.
7. The brick for ladles with high slag erosion resistance as claimed in claim 6, wherein the binding agent comprises silica sol and PVA, and the mass ratio of the silica sol to the PVA is 3-5: 1-3.
8. The brick for ladles with high slag erosion resistance according to claim 7, wherein SiO in the silica sol2The mass fraction of the PVA is 25-40%, the pH value of the silica sol is 9-10.5, and the PVA is a saturated solution of polyvinyl alcohol.
9. The brick for ladles with high slag corrosion resistance according to claim 6, wherein the additive is yttrium fluoride, and the particle size of the yttrium fluoride is 1-2 μm.
10. A method for preparing the brick for the ladle with high slag corrosion resistance according to any one of claims 1 to 9, which comprises the following steps:
mixing flint clay, andalusite, silicon carbide and aluminum-rich spinel according to the mass fraction ratio, and stirring for 10-20min to obtain a first material;
mixing the sintering aid, the antioxidant, the binding agent and the additive according to the mass fraction ratio, and stirring for 5-8min to obtain a second material;
mixing and stirring the first material and the second material for 10-20min to obtain a third material;
and (3) placing the third material under the pressure of 50-150MPa to be pressed into a green brick, and placing the green brick at the temperature of 1100-1300 ℃ to be fired for 5-8h to obtain the brick for the ladle with high slag corrosion resistance.
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