CN113698218A - Tundish cover castable and preparation method thereof - Google Patents
Tundish cover castable and preparation method thereof Download PDFInfo
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- CN113698218A CN113698218A CN202111274078.9A CN202111274078A CN113698218A CN 113698218 A CN113698218 A CN 113698218A CN 202111274078 A CN202111274078 A CN 202111274078A CN 113698218 A CN113698218 A CN 113698218A
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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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- C04B2235/32—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
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Abstract
The invention provides a pouring material for a tundish cover, which comprises: bauxite aggregate, fly ash ceramsite, floating bead, fly ash fine powder, bauxite fine powder, antioxidant, calcium aluminate cement, silica micropowder, retarding water reducing agent and rho-Al2O3Micropowder and explosion-proof agent. The invention also provides a preparation method of the pouring material for the tundish cover. The pouring material for the tundish cover has higher strength, good thermal shock resistance and stripping resistance, can reduce the cost economically and improve the benefit, and solves the problems of material falling, oxidation stripping and the like of the tundish cover on the aspect of performance.
Description
Technical Field
The invention belongs to the technical field of refractory materials, and particularly relates to a tundish cover castable and a preparation method thereof.
Background
In the continuous casting and steel casting process, the tundish cover plays an important role as a heat-insulating functional material for resisting the heat radiation of molten steel. The existing tundish cover mainly comprises two forms of cast steel and castable, wherein the cast steel tundish cover is easy to generate thermal stress difference and uneven heating in the using process, the conditions of deformation, oxidation, steel adhesion and the like occur, and the heat preservation effect of the tundish cover is weakened. The tundish cover in the casting material mode mainly comprises a steel structure frame and casting material composite forming, and has the advantages of long service life, low spare part consumption, simple and convenient knotting construction and the like.
With the continuous maturity and development of the casting material technology, the middle ladle cover in the casting material mode is adopted by a plurality of steel mills. In recent years, as the price of raw materials rises suddenly, the profits of refractory manufacturers are greatly reduced, and the tundish cover castable has to be produced by using low-grade refractory aggregate for survival. Meanwhile, the manufacturing level and the use level of each manufacturer are different, the service lives of the tundish covers are greatly different, and the adverse effects caused by the different service lives of the tundish covers are all comprehensive, such as stripping of pouring materials of the tundish covers, material falling, influence on steel pouring and heat preservation effects.
Chinese patent document CN106493320A discloses a continuous casting tundish cover pouring material and a preparation method thereof, wherein the pouring material comprises black aluminum sand, high-alumina bauxite fine powder, silica powder, cement, stainless steel fiber, an explosion-proof agent and a water reducing agent. The continuous casting tundish cover pouring material can reduce the cost and quickly bake, but other comprehensive properties are still to be improved, and in order to adapt to the increasingly harsh social environment at present and improve the service life and the high-temperature performance of the tundish cover, the research on an economical tundish cover pouring material with good anti-stripping, oxidation resistance and thermal shock resistance is urgently needed.
Disclosure of Invention
The invention aims to provide a pouring material for a tundish cover, which aims to solve the problem of poor comprehensive performance of the pouring material for the tundish cover in the prior art.
In order to solve the problems, the invention provides a pouring material for a tundish cover, which comprises bauxite aggregate, fly ash ceramsite, floating beads, fly ash fine powder, bauxite fine powder, an antioxidant, calcium aluminate cement, silica micropowder, a retarding water reducing agent and rho-Al2O3Micropowder and explosion-proof agent.
Preferably, the pouring material for the tundish cover comprises the following components in parts by weight: 5-20 parts of bauxite aggregate, 40-50 parts of fly ash ceramsite, 10-12 parts of floating bead, 10-15 parts of fly ash fine powder, 3-10 parts of bauxite fine powder, 2-5 parts of antioxidant, 5-10 parts of calcium aluminate cement, 2-6 parts of silica micropowder, 0.1-3 parts of retarding water reducer, rho-Al2O31-4 parts of micro powder and 2-5 parts of an explosion-proof agent.
Preferably, Al in the bauxite aggregate2O3The content of (B) is more than 75wt%, and the particle size is 15-8 mm.
Preferably, the fly ash ceramsite is composed of the following components in parts by weight: 10-12 parts of fly ash ceramsite with the particle size of 8-5mm, 10-15 parts of fly ash ceramsite with the particle size of 5-3mm and 18-20 parts of fly ash ceramsite with the particle size of 3-1 mm; al in the fly ash ceramsite2O3Greater than 30wt% of SiO2Less than 60 wt%;
the particle size of the fine fly ash powder is 0-0.074mm, and the specific surface area of the fine fly ash powder is not less than 300m2/kg。
Preferably, Al in the floating bead2O3Is greater than 40wt%, SiO2Less than 50 wt%; the floating beads have the particle size of 1-0mm and the volume density of not less than 0.50 g.cm-3。
Preferably, the particle size of the bauxite fine powder is 0-0.074 mm; al in the bauxite fine powder2O3Is greater than 75 wt%;
the particle size of the silicon micro powder is 0-0.620 mu m, and the specific surface area of the silicon micro powder is 10-15 square meters per kg;
the rho-Al2O3The particle size of the micro powder is submicron grade, rho-Al2O3The particle size of the micro powder is 500-800nm, rho-Al2O3The micro powder is calcium-free rho-Al2O3And (5) micro-powder.
Preferably, the antioxidant is sialon and oxynitride composite bonded silicon carbide; the SiC content in the silicon carbide is not less than 95 wt%.
Preferably, the calcium aluminate cement has a CaO content of 10 to 25wt%,Al2O3the content of (B) is 65-90 wt%.
Preferably, the retarding water reducer is one or a mixture of sodium tripolyphosphate and sodium hexametaphosphate; the pH value of the retarding water reducer is 9.0-9.5; the explosion-proof agent is one or a mixture of steel fibers and polypropylene fibers.
Compared with the prior art, the invention has the following beneficial effects:
(1) the pouring material for the tundish cover comprises: bauxite aggregate, fly ash ceramsite, floating bead, fly ash fine powder, bauxite fine powder, antioxidant, calcium aluminate cement, silica micropowder, retarding water reducing agent and rho-Al2O3Micropowder and explosion-proof agent. The castable has higher strength, good thermal shock resistance and stripping resistance, can reduce the cost economically and improve the benefit, and solves the problems of tundish cover material falling, oxidation stripping and the like in performance. The fly ash ceramsite is artificial lightweight aggregate prepared by taking fly ash as a main raw material, adding a curing agent and a fuel, mixing, pelletizing and roasting at a high temperature, and has the advantages of high heat preservation efficiency, small heat conductivity, low volume weight, reutilization of solid wastes and the like. Meanwhile, the fly ash is fine ash captured from flue gas generated after coal combustion, is one kind of solid waste, can be recycled by utilizing the fly ash ceramsite, and has the advantage of low cost compared with bauxite. The rho-Al2O3Has the characteristics of larger specific surface area and hydration activity, is favorable for forming ceramic combination and a compact structure. The floating beads are hollow microspheres which are obtained by melting in turbulent gas during combustion in fly ash and then rapidly cooling, and have the advantages of low volume weight, uniform particle size, low thermal conductivity, high refractoriness and the like. The bauxite fine powder is prepared by grinding calcined bauxite ore, and has the advantages of high refractoriness, chemical stability and the like. SiO in the silicon micro powder2The content is 92wt%, the grain diameter is 0-0.62 μm, and the product has the advantages of reducing porosity, improving the structural density and strength of the product and enhancing the erosion resistance. The silicon micro powder can be filled in floating beads and bauxite fine powder, so that the normal-temperature fluidity of the product is improved, and the high-temperature sintering performance of the product is promoted. The weight of the ladle cover can be reduced and the heat preservation effect can be improved by comprehensive consideration. In addition, in the invention, the fly ash ceramsite, the floating bead and the fly ash fine powder are combined, the three raw materials contain fly ash, the cost can be reduced, the refractoriness of the castable can be improved, and the mechanical strength of the castable can be obviously improved by combining the three raw materials.
(2) The tundish cover castable provided by the invention is characterized in that the antioxidant is sialon and silicon oxynitride composite silicon carbide, the sialon is sialon ceramic, is a synthetic word of four elements of Si, Al, O and N, and is Si3N4The general name of a large solid solution formed by replacing Si and N atoms by Al and O atoms. The sialon and silicon oxynitride composite silicon carbide microcosmically form a compact ceramic structure and has excellent oxidation resistance.
(3) The tundish cover castable disclosed by the invention is characterized in that the retarding water reducing agent is one of sodium tripolyphosphate and sodium hexametaphosphate. The main purpose of the retarding water reducer is to destroy the flocculation structure in the mixing process, release free water, disperse particles, delay the hardening time of the binder in the castable and guarantee smooth construction.
(4) The tundish cover castable provided by the invention has the advantages that the particle size of the fine powder of the fly ash is 0-0.074mm, when the fine powder of the fly ash with the particle size is added with water at normal temperature and is mixed with alkali metal hydroxide to react, a compound with hydraulic gelation is generated, and the castable is a material with improved strength and rapid cooling and heating resistance.
Detailed Description
Those not indicated in the examples of the present invention were carried out under the conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products commercially available. The raw materials used in the examples are all commercially available.
Example 1
The pouring material for the tundish cover in the embodiment comprises the following components in parts by weight: 12g of bauxite aggregate, 40g of fly ash ceramsite, 11g of floating bead, 10g of fly ash fine powder, 3g of bauxite fine powder, 2g of antioxidant, 10g of calcium aluminate cement, 4g of silica powder, 1.5g of retarding water reducer and rho-Al2O33g of micro powder and 5g of explosion-proof agent.
Wherein the bauxite aggregate is first-grade bauxite aggregate, and Al in the bauxite aggregate2O3The content of (B) is more than 75wt%, and the particle size is 15-8 mm.
The fly ash ceramsite comprises the following components in parts by weight: 12g of fly ash ceramsite with the particle size of 8-5mm, 10g of fly ash ceramsite with the particle size of 5-3mm and 18g of fly ash ceramsite with the particle size of 3-1 mm; al in the fly ash ceramsite2O3Greater than 30wt% of SiO2Less than 60 wt%;
al in the floating bead2O3Is greater than 40wt%, SiO2Less than 50 wt%; the floating beads have the particle size of 1-0mm and the volume density of not less than 0.50 g.cm-3。
The particle size of the fine powder of the fly ash is 0-0.074 mm;
the particle size of the bauxite fine powder is 0-0.074 mm; al in the bauxite fine powder2O3Is greater than 75 wt%;
the particle size of the silicon micro powder is 0-0.0620 μm;
the rho-Al2O3The particle size of the micro powder is 500-800nm and is calcium-free rho-Al2O3And (5) micro-powder.
The antioxidant is sialon and oxynitride composite combined silicon carbide, the composite silicon carbide raw material is purchased from Yuhua Doubong, and the brand number is 97 silicon carbide 200 meshes; the SiC content in the silicon carbide is not less than 95 wt%.
The content of CaO in the calcium aluminate cement is 10-25wt%, and Al2O3The content of (B) is 65-90 wt%.
The retarding water reducer is sodium tripolyphosphate; the pH value of the retarding water reducer is 9.0-9.5; the explosion-proof agent is one of steel fiber or polypropylene organic fiber.
The preparation method of the pouring material for the tundish cover comprises the following steps: the bauxite aggregate, the fly ash ceramsite, the floating bead, the fly ash fine powder, the bauxite fine powder, the antioxidant, the calcium aluminate cement, the silicon micro powder, the retarding water reducing agent and the rho-Al are taken according to the selected weight parts2O3Mixing the micropowder and the explosion-proof agent uniformly to obtain the finished product.
The application method of the pouring material for the tundish cover comprises the following steps: mixing the pouring material of the tundish cover with water according to the weight ratio of 100:4.5, pouring the mixture into a steel structure of the tundish cover, performing vibration molding by a vibration rod, standing for 24 hours, and curing for 2-3 days with a mold to bake.
Example 2
The pouring material for the tundish cover in the embodiment comprises the following components in parts by weight: 20g of bauxite aggregate, 50g of fly ash ceramsite, 10g of floating bead, 10g of fly ash fine powder, 10g of bauxite fine powder, 5g of antioxidant, 5g of calcium aluminate cement, 9g of silica powder, 2.5 of retarding water reducer and rho-Al2O33g of micro powder and 2g of explosion-proof agent.
Wherein the bauxite aggregate is first-grade bauxite aggregate, and Al in the bauxite aggregate2O3The content of (B) is more than 75wt%, and the particle size is 15-8 mm.
The fly ash ceramsite comprises the following components in parts by weight: 12g of fly ash ceramsite with the particle size of 8-5mm, 15g of fly ash ceramsite with the particle size of 5-3mm and 20g of fly ash ceramsite with the particle size of 3-1 mm; al in the fly ash ceramsite2O3Greater than 30wt% of SiO2Less than 60 wt%;
al in the floating bead2O3Is greater than 40wt%, SiO2Less than 50 wt%; the floating beads have the particle size of 1-0mm and the volume density of not less than 0.50 g.cm-3。
The particle size of the fine powder of the fly ash is 0-0.074 mm;
the particle size of the bauxite fine powder is 0-0.074 mm; al in the bauxite fine powder2O3Is greater than 75 wt%;
the particle size of the silicon micro powder is 0-0.0620 μm;
the rho-Al2O3The particle size of the micro powder is 500-800nm and is calcium-free rho-Al2O3And (5) micro-powder.
The antioxidant is sialon and oxynitride composite combined silicon carbide; the SiC content in the silicon carbide is not less than 95 wt%.
The content of CaO in the calcium aluminate cement is 10-25wt%, and Al2O3The content of (B) is 65-90 wt%.
The retarding water reducer is sodium hexametaphosphate; the pH value of the retarding water reducer is 9.0-9.5; the explosion-proof agent is high-molecular polyethylene fiber.
The preparation method of the pouring material for the tundish cover comprises the following steps: the bauxite aggregate, the fly ash ceramsite, the floating bead, the fly ash fine powder, the bauxite fine powder, the antioxidant, the calcium aluminate cement, the silicon micro powder, the retarding water reducing agent and the rho-Al are taken according to the selected weight parts2O3Mixing the micropowder and the explosion-proof agent uniformly to obtain the finished product.
The application method of the pouring material for the tundish cover comprises the following steps: mixing the pouring material of the tundish cover with water according to the weight ratio of 100:4, pouring the mixture into a steel structure of the tundish cover, performing vibration molding by a vibration rod, standing for 24 hours, and curing for 2-3 days with a mold to bake to obtain the castable.
Example 3
The pouring material for the tundish cover in the embodiment comprises the following components in parts by weight: 5g of bauxite aggregate, 45g of fly ash ceramsite, 12g of floating bead, 12g of fly ash fine powder, 8g of bauxite fine powder, 3g of antioxidant, 10g of calcium aluminate cement, 2g of silica powder, 2.5 g of retarding water reducer and rho-Al2O33g of micro powder and 2g of explosion-proof agent.
Wherein the bauxite aggregate is first-grade bauxite aggregate, and Al in the bauxite aggregate2O3The content of (B) is more than 75wt%, and the particle size is 15-8 mm.
The fly ash ceramsite comprises the following components in parts by weight: 10g of fly ash ceramsite with the particle size of 8-5mm, 15g of fly ash ceramsite with the particle size of 5-3mm and 18g of fly ash ceramsite with the particle size of 3-1 mm; al in the fly ash ceramsite2O3Greater than 30wt% of SiO2Less than 60 wt%;
al in the floating bead2O3Is greater than 40wt%, SiO2Less than 50 wt%; the floating beads have the particle size of 1-0mm and the volume density of not less than 0.50 g.cm-3。
The particle size of the fine powder of the fly ash is 0-0.074 mm;
the particle size of the bauxite fine powder is 0-0.074 mm; al in the bauxite fine powder2O3Is greater than 75 wt%;
the particle size of the silicon micro powder is 0-0.0620 μm;
the rho-Al2O3The particle size of the micro powder is 500-800nm and is calcium-free rho-Al2O3And (5) micro-powder.
The antioxidant is sialon and oxynitride composite combined silicon carbide; the SiC content in the silicon carbide is not less than 95 wt%.
The content of CaO in the calcium aluminate cement is 10-25wt%, and Al2O3The content of (B) is 65-90 wt%.
The retarding water reducer is formed by mixing sodium tripolyphosphate and sodium hexametaphosphate according to the weight ratio of 1: 1; the pH value of the retarding water reducer is 9.0-9.5; the explosion-proof agent is formed by mixing steel fibers and polypropylene fibers according to the weight ratio of 1: 1.
The preparation method of the pouring material for the tundish cover comprises the following steps: the bauxite aggregate, the fly ash ceramsite, the floating bead, the fly ash fine powder, the bauxite fine powder, the antioxidant, the calcium aluminate cement, the silicon micro powder, the retarding water reducing agent and the rho-Al are taken according to the selected weight parts2O3Mixing the micropowder and the explosion-proof agent uniformly to obtain the finished product.
The application method of the pouring material for the tundish cover comprises the following steps: mixing the pouring material of the tundish cover with water according to the weight ratio of 100:4, pouring the mixture into a steel structure of the tundish cover, performing vibration molding by a vibration rod, standing for 24 hours, and curing for 2-3 days with a mold to bake to obtain the castable.
Example 4
The pouring material for the tundish cover in the embodiment comprises the following components in parts by weight: 8g of bauxite aggregate, 46g of fly ash ceramsite, 12g of floating bead, 11g of fly ash fine powder, 4g of bauxite fine powder, 3g of antioxidant, 8g of calcium aluminate cement, 5g of silica powder, 0.2g of retarding water reducer and rho-Al2O32g of micro powder and 2g of explosion-proof agent.
The other raw materials are the same as example 3, and the pouring material of the tundish and water are mixed according to the preparation method in example 3, wherein the mixing ratio of the pouring material of the tundish and the water is 100: 6.5 parts by weight of the raw materials are mixed and poured into a steel structure of a tundish cover, the mixture is formed by vibration of a vibration rod, and after standing for 24 hours, the mixture is cured with a mold for 2 to 3 days and baked, thus obtaining the finished product.
Example 5
The pouring material for the tundish cover in the embodiment comprises the following components in parts by weight: 16g of bauxite aggregate, 40g of fly ash ceramsite, 10g of floating bead, 10g of fly ash fine powder, 4g of bauxite fine powder, 4g of antioxidant, 5g of calcium aluminate cement, 6g of silica powder, 1.5g of retarding water reducer and rho-Al2O34g of micro powder and 3g of explosion-proof agent.
The other raw materials are the same as example 1, and the pouring material of the tundish and water are mixed according to the preparation method in example 1, the mixing ratio of the pouring material of the tundish and the water is 100:4.5, pouring the mixture into a steel structure of a tundish cover, vibrating and forming the mixture by a vibrating rod, standing the mixture for 24 hours, and curing the mixture with a mold for 2 to 3 days to bake the mixture.
Example 6
The pouring material for the tundish cover in the embodiment comprises the following components in parts by weight: 18g of bauxite aggregate, 40g of fly ash ceramsite, 10g of floating bead, 10g of fly ash fine powder, 4g of bauxite fine powder, 4g of antioxidant, 6g of calcium aluminate cement, 5g of silica powder, 2g of retarding water reducer and rho-Al2O33g of micro powder and 3g of explosion-proof agent.
The other raw materials are the same as example 1, and the pouring material of the tundish and water are mixed according to the preparation method in example 1, the mixing ratio of the pouring material of the tundish and the water is 100:4, pouring the mixture into a tundish cover steel structure, vibrating and forming the mixture by a vibrating rod, standing the mixture for 24 hours, and curing the mixture with a mold for 2 to 3 days to bake the mixture.
Comparative example 1
The pouring material for the tundish cover of the comparative example comprises the following components in parts by weight: 49g of alumina hollow sphere particles, 23g of white corundum fine powder, 16g of alpha-alumina micro powder, 12g of calcium aluminate cement and 0.5g of explosion-proof agent.
The pouring material of the tundish cover of the comparative example does not contain fly ash ceramsite and floating beads in aggregate;
the fine powder does not contain fly ash fine powder and bauxite fine powder; the hardening accelerator is limited to be purchased in the cement products of Yangzhou ZhongyiSiO of company2Cement with a content of 71%; the explosion-proof agent is high-molecular polyethylene fiber;
the aggregate comprises 16g of alumina hollow spheres with the particle sizes of 5-3mm, 15g of alumina hollow spheres with the particle sizes of 3-1mm and 18g of alumina hollow spheres with the particle sizes of 1-0; al in the alumina hollow sphere2O3The content of (B) is 99 wt%.
The method for using the pouring material for the tundish cover in the comparative example 1 is as follows: mixing the pouring material of the tundish cover with water according to the weight ratio of 100:6.8, pouring the mixture into a steel structure of the tundish cover, performing vibration molding by a vibration rod, standing for 24 hours, and curing for 2-3 days with a mold to bake.
Comparative example 2
The pouring material for the tundish cover of the comparative example comprises the following components in parts by weight: 65g of bauxite aggregate, 16g of bauxite fine powder, 3g of antioxidant, 8g of calcium aluminate cement, 5g of silica micropowder, 0.2g of retarding water reducer and rho-Al2O33g of micro powder and 2.1g of explosion-proof agent.
The aggregate comprises 10g of bauxite with the particle size of 18-5mm, 55g of bauxite with the particle size of 8-1mm and 10g of bauxite with the particle size of 0.074-0.089; al in the bauxite2O3The content of (B) is 85 wt%.
The antioxidant is sialon and oxynitride composite combined silicon carbide, the composite silicon carbide raw material is purchased from Yuhua Doubong, and the brand number is 97 silicon carbide 200 meshes;
the content of CaO in the calcium aluminate cement is 10-25wt%, and Al2O3The content of (B) is 65-90 wt%;
the retarding water reducer is sodium tripolyphosphate; the pH value of the retarding water reducer is 9.0-9.5, and the particle size of the silicon micropowder is 0-0.0620 μm;
the explosion-proof agent is one of steel fiber or polypropylene organic fiber;
the comparative example 2 does not contain floating beads, fly ash ceramsite and fine powder;
the method for using the pouring material for the tundish cover in the comparative example 2 is as follows: mixing the pouring material of the tundish cover with water according to the weight ratio of 100:5, pouring the mixture into a steel structure of the tundish cover, performing vibration molding by a vibration rod, standing for 24 hours, and curing for 2-3 days with a mold to bake to obtain the castable.
Examples of Effect test
The tundish cap castable prepared in examples 1 to 6 and comparative examples 1 to 2, which is numbered as 1 to 8, was subjected to the following experiments:
mixing the pouring material of the tundish cover with water according to the weight ratio of 100:4-6.5, performing vibration pouring molding on the obtained mixture to obtain a 1-8 sample, curing for 24 hours, then demolding, baking in an oven at 110 ℃ for 3 hours, and measuring the normal-temperature compressive strength; baking in an oven at 110 deg.C for 24 hr, and measuring volume density, apparent porosity, and flexural strength at room temperature (25 deg.C). The material is burnt in a high-temperature furnace at 1300 ℃ for 3 hours, and the flexural strength at normal temperature (25 ℃), the compressive strength at normal temperature (25 ℃) and the linear change are measured. The samples were fired at 1300 ℃ for 3 hours in a high temperature furnace, and the room temperature (25 ℃) flexural strength, room temperature (25 ℃) compressive strength, linear change, and high temperature flexural strength at 1400 ℃ were measured.
Through determination, the following experimental results are obtained:
from the above results, it can be known that increasing the particle size of 15-8mm and adjusting the particle size distribution can effectively increase the porosity of the sample and improve the thermal insulation performance, and the gradual increase of the addition amount of the sialon and silicon oxynitride composite silicon carbide as an antioxidant in examples 1-6 can effectively improve the high-temperature rupture resistance and compressive strength of the sample; comparative example 1, in which alumina hollow spheres are used as aggregates, has better normal temperature and high temperature performance than fly ash ceramsite, but has higher cost; comparative example 2, which does not contain fly ash ceramsite, floating bead, fly ash fine powder and no antioxidant, is inferior in mechanical properties and high temperature resistance. The fly ash ceramsite, the floating bead, the fly ash fine powder, the silicon micro powder and the bauxite fine powder are mixed according to a specific using amount, and the comprehensive performance of the embodiment 4 is optimal.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. A tundish cap castable, comprising: bauxite aggregate, fly ash ceramsite, floating bead, fly ash fine powder, bauxite fine powder, antioxidant, calcium aluminate cement, silica micropowder, retarding water reducing agent and rho-Al2O3Micropowder and explosion-proof agent.
2. A tundish castable material according to claim 1, comprising, in parts by weight: 5-20 parts of bauxite aggregate, 40-50 parts of fly ash ceramsite, 10-12 parts of floating bead, 10-15 parts of fly ash fine powder, 3-10 parts of bauxite fine powder, 2-5 parts of antioxidant, 5-10 parts of calcium aluminate cement, 2-6 parts of silica micropowder, 0.1-3 parts of retarding water reducer, rho-Al2O31-4 parts of micro powder and 2-5 parts of an explosion-proof agent.
3. The tundish lid castable material according to claim 1, wherein Al in the bauxite aggregate2O3The content of (B) is more than 75wt%, and the particle size is 15-8 mm.
4. The tundish cover castable according to claim 1, wherein the fly ash ceramsite comprises the following components in parts by mass: 10-12 parts of fly ash ceramsite with the particle size of 8-5mm, 10-15 parts of fly ash ceramsite with the particle size of 5-3mm and 18-20 parts of fly ash ceramsite with the particle size of 3-1 mm; al in the fly ash ceramsite2O3Greater than 30wt% of SiO2Less than 60 wt%;
the particle size of the fine fly ash powder is 0-0.074mm, and the specific surface area of the fine fly ash powder is not less than 300m2/kg。
5. According to claimThe tundish cap castable described in claim 1, wherein Al in the floating bead2O3Is greater than 40wt%, SiO2Less than 50 wt%; the floating beads have the particle size of 1-0mm and the volume density of not less than 0.50 g.cm-3。
6. The tundish lid castable material of claim 1,
the particle size of the bauxite fine powder is 0-0.074 mm; al in the bauxite fine powder2O3Is greater than 75 wt%;
the particle size of the silicon micro powder is 0-0.620 mu m, and the specific surface area of the silicon micro powder is 10-15 square meters per kg;
the rho-Al2O3The particle size of the micro powder is submicron grade, rho-Al2O3The particle size of the micro powder is 500-800nm, rho-Al2O3The micro powder is calcium-free rho-Al2O3And (5) micro-powder.
7. The tundish lid castable material of claim 1, wherein the antioxidant is sialon and oxynitride composite bonded silicon carbide; the SiC content in the silicon carbide is not less than 95 wt%.
8. The tundish castable material according to claim 1, wherein the calcium aluminate cement contains CaO in an amount of 10-25wt%, Al2O3The content of (B) is 65-90 wt%.
9. The tundish cover castable according to claim 1, wherein the retarding water reducer is one or a mixture of two of sodium tripolyphosphate and sodium hexametaphosphate; the pH value of the retarding water reducer is 9.0-9.5; the explosion-proof agent is one or a mixture of steel fibers and polypropylene fibers.
10. A method of preparing a tundish castable material according to any one of claims 1 to 9, comprising the steps of: based on the selected parts by weightBauxite aggregate, fly ash ceramsite, floating bead, fly ash fine powder, bauxite fine powder, antioxidant, calcium aluminate cement, silica micropowder, retarding water reducing agent and rho-Al2O3Mixing the micropowder and the explosion-proof agent uniformly to obtain the finished product.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115872767A (en) * | 2022-11-29 | 2023-03-31 | 钢城集团凉山瑞海实业有限公司 | Microporous castable for ladle cover |
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