CN112897999A - Castable for ladle slag-off plate, ladle slag-off plate and preparation method thereof - Google Patents
Castable for ladle slag-off plate, ladle slag-off plate and preparation method thereof Download PDFInfo
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- CN112897999A CN112897999A CN202110107646.XA CN202110107646A CN112897999A CN 112897999 A CN112897999 A CN 112897999A CN 202110107646 A CN202110107646 A CN 202110107646A CN 112897999 A CN112897999 A CN 112897999A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 87
- 239000000463 material Substances 0.000 claims abstract description 55
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound 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 claims abstract description 37
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 37
- 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 35
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052845 zircon Inorganic materials 0.000 claims abstract description 21
- 239000004005 microsphere Substances 0.000 claims abstract description 19
- MCMNRKCIXSYSNV-UHFFFAOYSA-N ZrO2 Inorganic materials O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052849 andalusite Inorganic materials 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 13
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 6
- 229910052751 metal Inorganic materials 0.000 claims description 20
- 239000002184 metal Substances 0.000 claims description 20
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 13
- 239000010703 silicon Substances 0.000 claims description 13
- 239000002245 particle Substances 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 5
- 239000010426 asphalt Substances 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 3
- 239000011863 silicon-based powder Substances 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 52
- 229910052742 iron Inorganic materials 0.000 abstract description 25
- 230000003628 erosive effect Effects 0.000 abstract description 14
- 239000011159 matrix material Substances 0.000 abstract description 14
- 230000035939 shock Effects 0.000 abstract description 10
- 239000005350 fused silica glass Substances 0.000 abstract description 8
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 abstract description 8
- 239000000654 additive Substances 0.000 abstract description 7
- 239000003795 chemical substances by application Substances 0.000 abstract description 4
- 230000003009 desulfurizing effect Effects 0.000 abstract description 4
- 239000000843 powder Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 7
- 239000000292 calcium oxide Substances 0.000 description 6
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 238000004458 analytical method Methods 0.000 description 5
- 230000002902 bimodal effect Effects 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 230000001737 promoting effect Effects 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 238000005266 casting Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000010191 image analysis Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 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
- C04B35/16—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 silicates other than clay
- C04B35/18—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 silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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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
- B22D43/00—Mechanical cleaning, e.g. skimming of molten metals
- B22D43/005—Removing slag from a molten metal surface
- B22D43/007—Removing slag from a molten metal surface by using scrapers
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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
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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
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- 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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- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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- 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
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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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- C04B2235/422—Carbon
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Abstract
The invention provides a castable for a ladle slag-off plate, the ladle slag-off plate and a preparation method thereof, wherein the castable for the ladle slag-off plate comprises the following components: 50-65 parts of mullite, 15-30 parts of andalusite, 3-12 parts of alumina, 2-8 parts of silicon carbide, 2-8 parts of alumina, 2-5 parts of zircon, 0.5-2 parts of steel fiber and 2-5 parts of pure calcium aluminate cement; 0.6-1.2 parts of silica micropowder, 0.5-2.5 parts of carbon microspheres and 0.06-0.16 part of water reducing agent. The carbon microspheres are used as additives and added into the castable for the ladle slag skimming plate, so that the wettability of molten iron, slag quality, a desulfurizing agent and the surface of a castable matrix can be effectively reduced. Adding zircon into the castable for the slag removing plate of the ladle, decomposing the zircon at a high temperature to generate zirconium dioxide and a fused quartz phase, wherein the zirconium dioxide can improve the toughness and the thermal shock stability of the material; the fused quartz can react with alumina in the matrix at high temperature to generate mullite, so that the mechanical strength and the erosion resistance of the material are improved, and the erosion resistance and the strength of the material are improved.
Description
Technical Field
The invention belongs to the technical field of molten iron refractory castable, and particularly relates to a castable for a ladle slag-off plate, the ladle slag-off plate and a preparation method thereof.
Background
With the rapid development of the steel-making technology, the molten iron desulphurization and slagging-off process is remarkably improved and promoted. At present, the outer layer of the metal core body of the slag removing plate of the ladle is mostly covered by refractory pouring materials such as mullite, andalusite, alumina, silicon carbide and the like with high mechanical strength and excellent high temperature resistance so as to prevent the metal core body from being corroded by high temperature, molten iron and slag. However, after the materials are used for casting, serious slag adhesion phenomenon is found on the surface of the castable of the slag skimming plate in the long-term use process. And the slag layer becomes more obvious along with the lapse of the service time, thereby leading to the reduction of the slag skimming efficiency and influencing the quality of the molten iron.
Disclosure of Invention
The embodiment of the invention aims to provide a castable for a ladle slag-off plate, and the castable is used for solving the technical problem that in the prior art, the surface of the castable for the ladle slag-off plate is seriously adhered with slag, so that the slag-off efficiency is low.
In order to achieve the purpose, the invention adopts the technical scheme that: the castable for the slag removing plate of the ladle comprises the following components: 50-65 parts of mullite, 15-30 parts of andalusite, 3-12 parts of alumina, 2-8 parts of silicon carbide, 2-8 parts of alumina, 2-5 parts of zircon, 0.5-2 parts of steel fiber, 2-5 parts of pure calcium aluminate cement, 0.6-1.2 parts of silica micropowder, 0.5-2.5 parts of carbon microspheres and 0.06-0.16 part of water reducing agent.
Alternatively, the main chemical components of mullite are: al (Al)2O3More than or equal to 65 wt%; the mullite gradation is: the mullite grain size is 5-3 mm and accounts for 32-38% of the mullite, the grain size is 3-1 mm and accounts for 25-31% of the mullite, and the grain size is 1-0 and accounts for 33-37% of the mullite.
Optionally, the chemical composition of zircon comprises: SiO 22 27～40wt％，ZrO 2 60～70wt％，Al2O30.1～0.5wt％，Fe2O30.05 to 0.5 wt%, CaO + MgO 0.05 to 1.0 wt%, and ignition loss 3 to 5 wt%.
Optionally, the zircon particle size is less than or equal to 0.045 mm.
Optionally, the particle size of the silicon micropowder is less than or equal to 0.045 mm.
Optionally, the particle size of the carbon microsphere is less than or equal to 0.01 mm.
In another aspect of the invention, a preparation method of a castable for a slag removing plate of a ladle is provided, which comprises the following steps:
stirring mullite, andalusite, spherical asphalt and steel fiber for 10-20 minutes, and uniformly dispersing to obtain a primary material;
mixing alumina, silicon carbide, alumina, zirconite, pure calcium aluminate cement, silicon, a water reducing agent and the primary material, and uniformly stirring to prepare the castable for the slag removing plate of the ladle.
On the other hand, the invention also provides a preparation method of the ladle slag-off plate, which comprises the following steps;
stirring water and the ladle slag-off plate by using a pouring material, wherein the weight ratio of the water to the material is 5-10: 100;
pouring the uniformly mixed ladle slag-off plate on the surface of the metal slag-off plate core body by using a pouring material, and naturally cooling for 24-48 h to obtain a poured metal slag-off plate;
and baking the cooled cast metal slag-off plate for 10-20 hours at 200-300 ℃.
The castable for the ladle slag removing plate provided by the invention has the beneficial effects that: compared with the prior art, the castable for the ladle deslagging plate disclosed by the invention adopts the carbon microspheres as the additive to be added into the castable for the ladle deslagging plate, so that the wettability of molten iron, slag and a desulfurizing agent on the surface of a castable matrix can be effectively reduced. In addition, by adding the zirconite into the castable for the ladle slag removing plate, the zirconite is decomposed at high temperature to generate zirconium dioxide and a fused quartz phase, wherein the zirconium dioxide can generate volume expansion through phase change, so that the expansion of cracks in the body of the ladle slag removing plate is inhibited, and the toughness and the thermal shock stability of the material are improved; the fused quartz generated by decomposition can react with alumina in the matrix at high temperature to generate mullite, so that the mechanical strength and the erosion resistance of the material are improved, and the material has remarkable effects of promoting the erosion resistance and the strength of the material. Meanwhile, the components in the interactive material for the ladle slag removing plate are reasonable in proportion, namely the castable has high-temperature mechanical strength and cannot influence the slag removing effect of the prepared slag removing plate due to too high slag adhesion degree.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a flow chart of a preparation method of a castable for a slag-off plate of a ladle in an embodiment of the invention;
FIG. 2 is a microscopic electronic image of a used ladle slag-off plate in the prior art;
FIG. 3 is a carbon element distribution diagram of a used ladle slag-off plate in the prior art;
FIG. 4 is a distribution diagram of oxygen elements after a slag skimming plate of a ladle in the prior art is used;
FIG. 5 is a distribution diagram of aluminum elements after a slag skimming plate of a ladle in the prior art is used;
FIG. 6 is a distribution diagram of silicon elements after the slag skimming plate for the ladle in the prior art is used;
FIG. 7 is a distribution diagram of calcium element after the slag skimming plate of the ladle in the prior art is used;
FIG. 8 is a distribution diagram of iron elements after a ladle slag skimming plate in the prior art is used;
FIG. 9 is a phase analysis spectrum of a castable after a ladle slag-off plate in the prior art is used.
Fig. 10 is a photograph of an unused ladle slag plate.
Fig. 11 is a photograph of a used prior art ladle slag plate.
Fig. 12 is a photograph of a used slag-raking plate for a ladle in the third embodiment.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The surface of the castable for the existing ladle slag removing plate is seriously adhered with slag, so that the slag removing efficiency is low. Through the research of the inventor, the main reason for the phenomenon is that the aluminum-silicon castable shows wettability with molten iron and slag under high temperature conditions so that the slag is easy to adhere to the surface. In addition, the adhesion of slag in molten iron is aggravated by the unevenness of the surface of the substrate due to the long-term infiltration and erosion of the molten iron and the slag.
Specifically, the invention carries out microscopic image and element analysis on a typical block on the slag skimming plate of the ladle. Fig. 2 shows a microscope image of the area. Fig. 3 to 8 are images of the block subjected to the element analysis. As can be seen from FIG. 2, there is a distinct bond attachment at the bottom right corner of the block, and relatively little smooth bond at the top left corner. The elemental analysis is carried out on the whole block, so that the main elements of the bonding material can be known more intuitively.
Fig. 3 is a distribution diagram of carbon elements, and it can be seen that the distribution of carbon elements is more even in the whole block, the lower right corner is slightly more, and no obvious boundary appears. As can be seen in fig. 4, the distribution of oxygen throughout the block is significantly increased in the lower right corner, and a blurred border appears in the middle, close to the border of the bond image. The distribution of the aluminum element is shown in fig. 5, where the aluminum element is distributed throughout the block, with a significant concentration increase in the lower right corner, and also with a clearer border that substantially coincides with the border of the bond of fig. 1. The distribution of elemental silicon in fig. 6 is substantially more even with a slight increase in the lower right corner. The lower right corner of the calcium element of fig. 7 is shown with a significant increase and a clearer border which also substantially coincides with the border of the bond of fig. 1. Fig. 8 shows the distribution of the iron element, which is more clear and distinct at the upper left corner, indicating that the iron element is not adhered by other impurities, and is in a normal slag skimming plate shape, and is superposed with the image of fig. 2. The lower right corner is provided with a large area of notch, which proves that the notch is covered by other impurities. From the above image analysis, the main elements in the binder were oxygen, aluminum, silicon, and calcium.
FIG. 9 shows a surface phase analysis chart of the slag skimming plate after use. The map shows that more calcium, silicon, oxygen and sulfur elements are present in the bond.
According to the analysis of elements and object images, the bonding object is the state of the castable after erosion. The erosion substance in the casting material is calcium silicate. The main source of the calcium element is mainly calcium oxide in the molten iron desulfurizer. Under high temperature conditions, calcium oxide reacts with free silicon dioxide in the casting material to form calcium silicate, so that the corrosion of calcium silicate is caused, and the surface viscosity of the slag skimming plate is increased greatly.
In order to overcome the technical problems, the castable for the slag removing plate of the ladle in the embodiment is developed, and specifically comprises the following components: 50-65 parts of mullite, 15-30 parts of andalusite, 3-12 parts of alumina, 2-8 parts of silicon carbide, 2-8 parts of alumina, 2-5 parts of zircon, 0.5-2 parts of steel fiber and 2-5 parts of pure calcium aluminate cement; 0.6-1.2 parts of silica micropowder, 0.5-2.5 parts of carbon microspheres and 0.06-0.16 part of water reducing agent.
It is understood that in order to provide the powder and particle compactness in the castable and the erosion resistance and mechanical strength of the material, a large amount of mullite and andalusite are used as aggregates, and in order to make the stirring mill uniformly mix alumina micropowder, silicon carbide micropowder, alumina micropowder, zircon micropowder and calcium cement as powders with the aggregates. Furthermore, the slag bonding property, the high-temperature strength and the thermal shock stability of the material are changed by changing the chemical composition in the castable, particularly by changing the contents of mullite, andalusite and zircon. In addition, zircon is added to improve the thermal shock stability of the material.
Compared with the prior art, the castable for the ladle deslagging plate adopts the carbon microspheres as the additive to be added into the castable for the ladle deslagging plate, and can effectively reduce the wettability of molten iron, slag substances, a desulfurizing agent and the surface of a castable matrix. And moreover, the slag adhering effect on the surface of the castable is improved, the slag removing efficiency is improved, and the quality of molten iron is optimized. In addition, as the slag and the molten iron are not easy to adhere to the surface of the matrix, the reaction probability of substances such as CaO and the like with the surface of the matrix is reduced, the erosion resistance of the castable is further improved, the smoothness of the surface of the castable is ensured, and the adhesion of the slag in the molten iron is reduced. Meanwhile, the carbon microspheres with high sphericity and small particle size are adopted, so that the flow property of the castable can be improved, and the construction operation is convenient. Furthermore, according to the technical scheme, the zirconite is added into the castable for the slag removing plate of the ladle, and is decomposed at high temperature to generate zirconium dioxide and a fused quartz phase, wherein the zirconium dioxide can generate volume expansion through phase change to inhibit the expansion of cracks in the matrix, so that the toughness and the thermal shock stability of the material are improved; the fused quartz generated by decomposition can react with alumina in the matrix at high temperature to generate mullite, so that the mechanical strength and the erosion resistance of the material are improved, and the material has remarkable effects of promoting the erosion resistance and the strength of the material. Thereby promoting the smoothness of the surface of the slag-raking plate of the ladle, solving the problem that the surface of the castable for the slag-raking plate of the ladle is seriously adhered with slag, and simultaneously promoting the slag-raking efficiency.
As a more preferred embodiment, the castable of the ladle slag-off plate comprises the following components: 60-65 parts of mullite, 15-20 parts of andalusite, 3-6 parts of alumina, 2-4 parts of silicon carbide, 2-4 parts of alumina, 2-3 parts of zircon, 0.5-2 parts of steel fiber and 2-5 parts of pure calcium aluminate cement; 0.6-1.2 parts of silicon, 2-2.5 parts of carbon microspheres and 0.06-0.16 part of water reducing agent. In the embodiment, the addition amount of the mullite aggregate is increased, and the close accumulation degree of powder and particles in the castable is improved, so that the erosion resistance and the mechanical strength of the material are improved. The slag-sticking performance, the high-temperature strength and the thermal shock stability of the material are changed. The addition of aluminum is properly reduced, the high-temperature mechanical strength of the material is improved, and the slag skimming effect of the slag skimming plate is ensured. In addition, the content of zircon sand is increased, so that the thermal shock stability of the material is improved.
Further, the main chemical components of the mullite are as follows: al (Al)2O3More than or equal to 65 wt%; the mullite gradation is: the mullite grain size is 5-3 mm and accounts for 32-38% of the mullite, the grain size is 3-1 mm and accounts for 25-31% of the mullite, and the grain size is 1-0 and accounts for 33-37% of the mullite. The even distribution of the particle size enables better stirring of the material and promotes the compactness of the pile.
The chemical components of the zircon comprise: SiO 22 27～40wt％，ZrO 2 60～70wt％，Al2O3 0.1～0.5wt％，Fe2O30.05 to 0.5 wt%, CaO + MgO 0.05 to 1.0 wt%, and ignition loss 3 to 5 wt%. Wherein the grain diameter of the zircon is less than or equal to 0.045 mm. Through reducing the particle size of zircon can be better mix zircon and other materials, promote the thermal shock stability of material.
In the embodiment, the grain size of the silicon micro powder is less than or equal to 0.045mm, and the grain size of the carbon micro-sphere is less than or equal to 0.01 mm. The silicon micro powder and the carbon microspheres are added, so that the mixing uniformity of the castable can be further improved, the mechanical strength of the material is improved, and the caking property of molten iron is reduced.
Preferably, the alumina adopts bimodal active alpha-alumina micropowder with higher activity, and the grain diameter of the bimodal active alpha-alumina micropowder is less than or equal to 0.008 mm. The steel fiber is heat-resistant steel fiber, so that the stability of the castable under high-temperature conditions is improved. The grain size of the calcium aluminate cement is less than or equal to 0.045mm, and the mixing uniformity of the castable is improved. The water reducing agent is a polycarboxylic acid water reducing agent, has strong dispersibility and good fluidity, can improve the mixing uniformity of the castable, improves the smoothness of the surface and reduces the adhesion of slag in molten iron.
Specifically, referring to fig. 1, the preparation of the castable for a slag-off plate of a ladle in the present embodiment includes the following steps: stirring mullite, andalusite, spherical asphalt and steel fiber for 10-20 minutes, and uniformly dispersing to obtain a primary material;
mixing alumina, silicon carbide, alumina, zirconite, pure calcium aluminate cement, silicon, a water reducing agent and the primary material, and uniformly stirring to prepare the castable for the slag removing plate of the ladle.
The following describes the preparation of the ladle slag skimming plate by using the ladle slag skimming plate castable in the embodiment, and comprises the following steps;
stirring water and the ladle slag-off plate by using a pouring material, wherein the weight ratio of the water to the material is 5-10: 100;
pouring the uniformly mixed ladle slag-off plate on the surface of the metal slag-off plate core body by using a pouring material, and naturally cooling for 24-48 h to obtain a poured metal slag-off plate;
and baking the cooled cast metal slag-off plate for 10-20 hours at 200-300 ℃.
Compared with the prior art, the invention has the following positive effects:
according to the invention, the carbon microspheres are used as additives and added into the castable for the ladle slag skimming plate, so that molten iron, slag quality, wettability of a desulfurizing agent and the surface of a castable matrix can be effectively reduced, the slag sticking effect on the surface of the castable is improved, the slag skimming efficiency is improved, and the quality of the molten iron is optimized. In addition, as the slag and the molten iron are not easy to adhere to the surface of the matrix, the reaction probability of substances such as CaO and the like and the surface of the matrix is reduced, the erosion resistance of the castable is improved, the smoothness of the surface of the castable is ensured, and the adhesion of the slag in the molten iron is reduced. Meanwhile, the carbon microspheres with high sphericity and small particle size are adopted, so that the flow property of the castable can be improved, and the construction operation is convenient.
The zircon is added into the castable for the slag skimming plate of the ladle, so that the corrosion resistance and the strength of the material are improved obviously. Zirconium dioxide and a fused quartz phase are generated by decomposing zircon at a high temperature, wherein the zirconium dioxide can generate volume expansion through a phase change effect to inhibit the expansion of cracks in a matrix, so that the toughness and the thermal shock stability of the material are improved; the fused quartz generated by decomposition can react with alumina in the matrix at high temperature to generate mullite, so that the mechanical strength and the corrosion resistance of the material are improved.
Therefore, the slag adhesion, the thermal shock stability and the erosion resistance of the castable for the slag removing plate of the foundry ladle are obviously improved by adding the carbon microspheres and the zirconite.
The first embodiment is as follows:
a preparation method of a castable for a high-performance ladle slag-off plate comprises the following steps of taking 50-55 parts of mullite aggregate, 25-30 parts of andalusite, 9-12 parts of alumina micro powder, 6-8 parts of silicon carbide micro powder, 6-8 parts of bimodal active alpha-alumina micro powder, 4-5 parts of zirconite, 0.5-2 parts of steel fiber and 2-5 parts of pure calcium aluminate cement as raw materials; pouring 0.6-1.2 parts of silica micropowder, 0.5-1.5 parts of carbon microspheres and 0.06-0.16 part of water reducing agent as additives into a stirrer, and drying and mixing uniformly to obtain the castable for the slag removing plate of the foundry ladle.
Stirring water and the ladle slag-off plate by using a pouring material, wherein the weight ratio of the water to the material is 5-10: 100; pouring the uniformly mixed ladle slag-off plate on the surface of the metal slag-off plate core body by using a pouring material, and naturally cooling for 24-48 h to obtain a poured metal slag-off plate; and baking the cooled cast metal slag removing plate for 10-20 hours at 200-300 ℃ to obtain the ladle slag removing plate.
The surface of the slag-off plate of the ladle in the embodiment is smoother, and the adhesion condition of the molten iron slag mass is obviously improved. The slag adhered to the surface is obviously reduced by observing and analyzing the used slag removing plate of the ladle.
Example two:
the preparation method of the castable for the high-performance ladle slag-off plate comprises the following steps of taking 55-60 parts of mullite aggregate, 20-25 parts of andalusite, 6-9 parts of alumina micro powder, 4-6 parts of silicon carbide micro powder, 4-6 parts of bimodal active alpha-alumina micro powder, 3-4 parts of zirconite, 0.5-2 parts of steel fiber and 2-5 parts of pure calcium aluminate cement as raw materials; pouring 0.6-1.2 parts of silicon micropowder, 1.5-2 parts of carbon microspheres and 0.06-0.16 part of water reducing agent as additives into a stirrer, and drying and mixing uniformly to obtain the castable for the slag removing plate of the foundry ladle.
Stirring water and the ladle slag-off plate by using a pouring material, wherein the weight ratio of the water to the material is 5-10: 100; pouring the uniformly mixed ladle slag-off plate on the surface of the metal slag-off plate core body by using a pouring material, and naturally cooling for 24-48 h to obtain a poured metal slag-off plate; and baking the cooled cast metal slag removing plate for 10-20 hours at 200-300 ℃ to obtain the ladle slag removing plate. The surface of the slag-off plate of the ladle in the embodiment is smoother, and the adhesion condition of the molten iron slag mass is obviously improved. By observing and analyzing the used slag removing plate of the ladle, the slag adhered to the surface is obviously reduced.
Example three:
a preparation method of a castable for a high-performance ladle slag-off plate comprises the following steps of taking 60-65 parts of mullite aggregate, 15-20 parts of andalusite, 3-6 parts of alumina, 2-4 parts of silicon carbide, 2-4 parts of bimodal active alpha-alumina micro powder, 2-3 parts of zirconite, 0.5-2 parts of steel fiber and 2-5 parts of pure calcium aluminate cement as raw materials; pouring 0.6-1.2 parts of silicon micropowder, 2-2.5 parts of carbon microspheres and 0.06-0.16 part of water reducing agent as additives into a stirrer, and drying and mixing uniformly to obtain the castable for the slag removing plate of the foundry ladle.
Stirring water and the ladle slag-off plate by using a pouring material, wherein the weight ratio of the water to the material is 5-10: 100; pouring the uniformly mixed ladle slag-off plate on the surface of the metal slag-off plate core body by using a pouring material, and naturally cooling for 24-48 h to obtain a poured metal slag-off plate; and baking the cooled cast metal slag removing plate for 10-20 hours at 200-300 ℃ to obtain the ladle slag removing plate. The surface of the slag-off plate of the ladle in the embodiment is smoother, and the adhesion condition of the molten iron slag mass is obviously improved.
Fig. 10 is a photograph of an unused ladle slag plate. Fig. 11 is a photograph of a used ladle slag trap prepared by a prior art method. Comparing it with the slag-removing plate prepared by using the castable of this embodiment, the slag-removing plate of this embodiment in fig. 12 significantly reduces the adhesion of molten iron and slag.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The castable for the slag removing plate of the foundry ladle is characterized by comprising the following components: 50-65 parts of mullite, 15-30 parts of andalusite, 3-12 parts of alumina, 2-8 parts of silicon carbide, 2-8 parts of alumina, 2-5 parts of zircon, 0.5-2 parts of steel fiber, 2-5 parts of pure calcium aluminate cement, 0.6-1.2 parts of silica micropowder, 0.5-2.5 parts of carbon microspheres and 0.06-0.16 part of water reducing agent.
2. The castable for the ladle slag-off plate according to claim 1, wherein the mullite comprises the following main chemical components: al (Al)2O3More than or equal to 65 wt%; the mullite gradation is as follows: the mullite grain size is 5-3 mm and accounts for 32-38% of the mullite, the grain size is 3-1 mm and accounts for 25-31% of the mullite, and the grain size is 1-0 and accounts for 33-37% of the mullite.
3. A castable material for a ladle slag-off plate according to claim 1, wherein the zircon has a chemical composition comprising: SiO 22 27～40wt％，ZrO2 60～70wt％，Al2O3 0.1～0.5wt％，Fe2O30.05 to 0.5 wt%, CaO + MgO 0.05 to 1.0 wt%, and ignition loss 3 to 5 wt%.
4. The castable for a ladle slag raking plate according to any one of claims 1 to 3, wherein the zircon has a particle size of 0.045mm or less.
5. The castable for the ladle slag-off plate according to any one of claims 1 to 3, wherein the particle size of the fine silicon powder is not more than 0.045 mm.
6. The castable for the ladle slag-off plate according to any one of claims 1 to 3, wherein the carbon microspheres have a particle size of 0.01mm or less.
7. A preparation method of a castable for a slag removing plate of a foundry ladle is characterized by comprising the following steps:
stirring mullite, andalusite, spherical asphalt and steel fiber for 10-20 minutes, and uniformly dispersing to obtain a primary material;
and mixing alumina, silicon carbide, alumina, zirconite, pure calcium aluminate cement, silicon, a water reducing agent and the initial material, and uniformly stirring to prepare the castable for the ladle slag skimming plate.
8. A preparation method of a ladle slag-off plate is characterized by comprising the following steps;
stirring water and the castable for the ladle slag-off plate according to any one of claims 1-6, wherein the weight ratio of the water to the material is 5-10: 100;
pouring the uniformly mixed ladle slag-off plate on the surface of the metal slag-off plate core body by using a pouring material, and naturally cooling for 24-48 h to obtain a poured metal slag-off plate;
and baking the cooled cast metal slag skimming plate for 10-20 hours at 200-300 ℃.
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