CN106431438B - Castable for tundish slag-stopping wall and preparation method thereof - Google Patents
Castable for tundish slag-stopping wall and preparation method thereof Download PDFInfo
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- CN106431438B CN106431438B CN201610859822.4A CN201610859822A CN106431438B CN 106431438 B CN106431438 B CN 106431438B CN 201610859822 A CN201610859822 A CN 201610859822A CN 106431438 B CN106431438 B CN 106431438B
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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Abstract
The invention discloses a castable for a tundish slag-stopping wall and a preparation method thereof, belonging to refractory materials used in the technical field of steel smelting. The castable comprises main materials and an additive, wherein: according to the weight ratio, the main materials comprise 45-75% of fused white corundum and/or tabular corundum, 5-15% of fused compact corundum, 1-10% of fused magnesia powder, 1-5% of spinel particles, 2-10% of spinel micro powder, 2-10% of activated alumina powder, 3-6% of calcium aluminate cement and 0.2-2% of silicon micro powder; wherein the particle sizes of the fused white corundum, the plate-shaped corundum and the fused compact corundum are all less than or equal to 15 mm; the additive comprises a water reducing agent and explosion-proof organic fibers, and the dosage of the additive is 0.5-1% and 0.01-0.15% of the total weight of the main material respectively. The castable has high normal temperature strength and high temperature thermal state strength, and can effectively prolong the service life of the tundish slag wall.
Description
Technical Field
The invention relates to a refractory material used in the technical field of steel smelting, in particular to a castable for a tundish slag-stopping wall and a preparation method thereof.
Background
The tundish is positioned between the steel ladle and the crystallizer and is used for receiving molten steel of the steel ladle and injecting the molten steel into the crystallizer, so that the tundish plays a direct role in judging the quality of a continuous casting billet and realizing high-efficiency continuous casting. The slag wall is the core component of the tundish, and firstly has good construction performance, and a construction body is not hydrated or cracked in the curing and baking processes, does not collapse or resist scouring in the using process, and can meet the requirements of multi-furnace continuous casting steel. Secondly, the slag retaining wall is a thin plate type prefabricated member and has high enough strength to meet the requirements of carrying and hanging installation. When in use, the steel needs to be rapidly baked from normal temperature to 1000 ℃, then is subjected to long-time scouring erosion in high-temperature molten steel at 1550 ℃ or so, and also has good high-temperature strength and erosion resistance. Therefore, the slag wall needs to have better normal temperature strength and high temperature thermal state strength at the same time, and the problem that the normal temperature strength is high and the thermal state high temperature strength is not high enough commonly exists in the existing slag wall castable for steel mills.
Disclosure of Invention
The invention provides a castable for a tundish slag trap and a preparation method thereof, and solves the technical problem that the castable for the slag trap in a steel mill in the prior art cannot have higher normal-temperature strength and hot-state high-temperature strength at the same time.
In order to solve the technical problems, the invention provides a castable for a tundish slag-stopping wall, which comprises a main material and an additive, wherein:
according to the weight ratio, the main materials comprise 45-75% of fused white corundum and/or tabular corundum, 5-15% of fused compact corundum, 1-10% of fused magnesia powder, 1-5% of spinel particles, 2-10% of spinel micro powder, 2-10% of activated alumina powder, 3-6% of calcium aluminate cement and 0.2-2% of silicon micro powder; wherein the particle sizes of the fused white corundum, the plate-shaped corundum and the fused compact corundum are all less than or equal to 15 mm;
the additive comprises a water reducing agent and explosion-proof organic fibers, and the dosage of the additive is 0.5-1% and 0.01-0.15% of the total weight of the main material respectively.
Further, in the electro-fused white corundum and/or plate-shaped corundum, the particle size and the weight percentage of the particle size are respectively as follows: 10-20% of particles with the particle size of more than 8mm and less than or equal to 15mm, 5-20% of particles with the particle size of more than 5mm, 5-20% of particles with the particle size of more than 3mm, 10-20% of particles with the particle size of more than 1mm and less than or equal to 3mm, 5-20% of particles with the particle size of more than 0.1 and less than or equal to 1mm, and 5-30% of particles with the particle size of less than.
Further, in the fused dense corundum, the particle size and the weight percentage of the particles are respectively as follows: the particle size of more than 8mm and less than or equal to 15mm accounts for 10-30%, the particle size of more than 5mm and less than or equal to 8mm accounts for 5-20%, the particle size of more than 3mm and less than or equal to 5mm accounts for 5-30%, the particle size of more than 1 and less than or equal to 3mm accounts for 10-30%, and the particle size of more than 0.1 and less than or equal to 1mm accounts for 5.
Furthermore, the granularity of the fused magnesia powder is less than or equal to 0.1 mm; the particle size of the spinel particles is 0.1-1 mm; the granularity of the spinel micro powder is less than or equal to 25 mu m; the particle size of the active alumina powder is less than or equal to 0.1 mm.
Further, the water reducing agent is an FDN water reducing agent.
Further, the explosion-proof organic fiber is one or two of polypropylene fiber and polyethylene fiber.
The invention also provides a preparation method of the castable for the tundish slag-stopping wall, which comprises the following steps:
uniformly mixing all the components in the main material; according to the weight ratio, the main materials comprise 45-75% of fused white corundum and/or tabular corundum, 5-15% of fused compact corundum, 1-10% of fused magnesia powder, 1-5% of spinel particles, 2-10% of spinel micro powder, 2-10% of activated alumina powder, 3-6% of calcium aluminate cement and 0.2-2% of silicon micro powder; wherein the particle sizes of the fused white corundum, the plate-shaped corundum and the fused compact corundum are all less than or equal to 15 mm;
adding a water reducing agent and explosion-proof organic fibers into the uniformly mixed main material and uniformly mixing to obtain a mixture; wherein the water reducing agent and the explosion-proof organic fiber are respectively 0.5-1% and 0.01-0.15% of the total weight of the main material;
adding water into the mixture for stirring, and inserting a vibrating rod for vibrating in the stirring process so as to facilitate air exhaust; wherein the addition amount of the water is 3-5% of the total weight of the mixture;
and (3) forming and maintaining the stirred mixture, and then keeping the temperature at 110 ℃ for 24 hours to obtain the castable.
Further, in the electro-fused white corundum and/or plate-shaped corundum, the particle size and the weight percentage of the particle size are respectively as follows: 10-20% of particles with the particle size of more than 8mm and less than or equal to 15mm, 5-20% of particles with the particle size of more than 5mm, 5-20% of particles with the particle size of more than 3mm, 10-20% of particles with the particle size of more than 1mm and less than or equal to 3mm, 5-20% of particles with the particle size of more than 0.1 and less than or equal to 1mm, and 5-30% of particles with the particle size of less than.
Further, in the fused dense corundum, the particle size and the weight percentage of the particles are respectively as follows: the particle size of more than 8mm and less than or equal to 15mm accounts for 10-30%, the particle size of more than 5mm and less than or equal to 8mm accounts for 5-20%, the particle size of more than 3mm and less than or equal to 5mm accounts for 5-30%, the particle size of more than 1 and less than or equal to 3mm accounts for 10-30%, and the particle size of more than 0.1 and less than or equal to 1mm accounts for 5.
The invention also provides a slag stopping wall made of the castable.
One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:
the castable for the tundish slag-stopping wall is prepared by grading the particle size of the aggregate, introducing large-particle aggregate, adding spinel particles and fine powder and simultaneously generating spinel in situ in the castable, so that spinel with a certain particle size gradient is formed in the castable, and the prepared castable has high normal-temperature strength and high-temperature hot-state strength at the same time, so that the technical problem that the castable for the slag-stopping wall in a steel mill in the prior art cannot have high normal-temperature strength and high-temperature hot-state strength at the same time is solved, the service life of the tundish slag-stopping wall is prolonged, the judgment rate of blank materials is reduced, the production cost is reduced, and the market competitiveness of products is improved.
Drawings
FIG. 1 is a flow chart of a preparation method of a castable for a slag retaining wall in an embodiment of the invention.
Detailed Description
The embodiment of the invention provides a castable for a tundish slag trap and a preparation method thereof, which solve the technical problem that the castable for the slag trap in a steel mill in the prior art cannot have higher normal temperature strength and hot high temperature strength at the same time; the castable has high normal temperature strength and high temperature thermal state strength, and can effectively prolong the service life of the tundish slag wall.
In order to achieve the above object, an embodiment of the present invention provides a castable for a tundish slag wall, including a main material and an additive, wherein:
according to the weight ratio, the main materials comprise 45-75% of fused white corundum and/or tabular corundum, 5-15% of fused compact corundum, 1-10% of fused magnesia powder, 1-5% of spinel particles, 2-10% of spinel micro powder, 2-10% of activated alumina powder, 3-6% of calcium aluminate cement and 0.2-2% of silicon micro powder; wherein the particle sizes of the fused white corundum, the plate-shaped corundum and the fused compact corundum are all less than or equal to 15 mm;
the additive comprises a water reducing agent and explosion-proof organic fibers, and the dosage of the additive is 0.5-1% and 0.01-0.15% of the total weight of the main material respectively.
In the embodiment of the invention, in the electric melting white corundum and/or plate-shaped corundum, the particle size and the weight percentage of the particle size are respectively as follows: 10-20% of particles with the particle size of more than 8mm and less than or equal to 15mm, 5-20% of particles with the particle size of more than 5mm, 5-20% of particles with the particle size of more than 3mm, 10-20% of particles with the particle size of more than 1mm and less than or equal to 3mm, 5-20% of particles with the particle size of more than 0.1 and less than or equal to 1mm, and 5-30% of particles with the particle size of less than. When the material forms continuous particle close packing, the compactness is strongest, different raw material particles form continuous close packing, the required particle grading is different, and the content of each component in the material is changed to form the close packing when each particle size is increased. In the electro-fused white corundum and/or plate-shaped corundum, the close packing can be formed according to the grain size distribution and the content composition, and the porosity of the castable can be effectively reduced.
In the embodiment of the invention, in the fused dense corundum, the particle size and the weight percentage of the particle size are respectively as follows: the particle size of more than 8mm and less than or equal to 15mm accounts for 10-30%, the particle size of more than 5mm and less than or equal to 8mm accounts for 5-20%, the particle size of more than 3mm and less than or equal to 5mm accounts for 5-30%, the particle size of more than 1 and less than or equal to 3mm accounts for 10-30%, and the particle size of more than 0.1 and less than or equal to 1mm accounts for 5. In the fused compact corundum, the compact packing can be formed according to the grain size distribution and the content composition, and the porosity of the castable can be effectively reduced.
In the embodiment of the invention, the granularity of the fused magnesia powder is less than or equal to 0.1 mm; the particle size of the spinel particles is 0.1-1 mm; the granularity of the spinel micro powder is less than or equal to 25 mu m; the particle size of the active alumina powder is less than or equal to 0.1 mm. The addition of spinel micropowder can effectively promote the sintering of casting, and the spinel particles with the particle size of 0.1-1mm and the spinel micropowder with the particle size of less than or equal to 25 mu m are added to form spinel with a certain particle size gradient in the casting material so as to enhance the compactness and the high-temperature thermal state strength of the casting material.
In the embodiment of the invention, the water reducing agent is an FDN water reducing agent.
In the embodiment of the invention, the explosion-proof organic fiber is one or two of polypropylene fiber and polyethylene fiber.
The selection of the components in the castable for the tundish slag wall provided by the embodiment of the invention is based on the following principle:
the castable for the tundish slag-stopping wall in the embodiment of the invention is prepared by compounding one or two of electric-melting white corundum and tabular corundum with electric-melting compact corundum to form aggregate, and because the apparent porosity of the electric-melting compact corundum is lower than that of the electric-melting white corundum, and part of the electric-melting compact corundum is introduced to be used as the aggregate, the compactness of the castable can be improved and the porosity is reduced. The plate-shaped corundum and the electric melting white corundum are main aggregate components, the compactness of the castable is higher when the plate-shaped corundum is used independently, and the purpose of adding part of the electric melting compact corundum is to improve the compactness of the castable. The added fused dense corundum accounts for 5-15% of the total weight of the main materials, the performance cannot be improved when the added amount is too small, and the production cost is increased when the added amount is too large. The electric melting white corundum and/or tabular corundum accounts for 45-75% of the total weight of the main materials, the castable is not compact when used in an excessive amount, the consumption is too small, the fine powder is excessive, the water consumption of the castable is large, and the strength is low. The aggregate disclosed by the invention contains more large-particle components, corundum particles with the particle sizes of 8-15 mm and 5-8 mm are introduced, and the corundum particles and added fine powder (the components with the particle size of less than or equal to 0.1mm are collectively called as fine powder) form close packing, so that the strength of a sample is greatly increased.
The castable matrix is composed of fused magnesia powder, spinel particles, spinel micro powder, activated alumina powder, silicon micro powder and calcium aluminate cement. Wherein: the added fused magnesia powder can react with the active alumina powder in the raw materials to generate magnesia-alumina spinel in situ, microcracks are formed in the castable so as to improve the thermal shock resistance of the castable, but too much spinel generated in situ can cause too many microcracks to reduce the strength of the castable. Therefore, the content of the magnesium aluminate spinel generated in situ in the castable is controlled by controlling the adding amount of the fused magnesia powder and the active alumina powder so as to control the number of microcracks in the castable, and the weight ratio of the added fused magnesia powder is 1-10 percent, and the granularity is less than or equal to 0.1 mm; the total content of spinel in the castable is controlled by controlling the content of added spinel micro powder, in the embodiment of the invention, the superfine spinel micro powder with the granularity of less than or equal to 25 mu m is used, and the spinel with a certain granularity gradient is formed in the middle of the castable together with the spinel generated in situ, so that the compactness and the high-temperature thermal state strength of the castable are enhanced. The silicon micro powder is added to increase the medium temperature strength of the sample and prevent the slag wall from forming cracks and breaking in the baking and carrying processes, but the silicon micro powder cannot be added too much, and the liquid phase of the sample is changed too much in a high temperature state after the silicon micro powder is added, so that the hot high temperature strength is reduced.
In addition, the castable provided by the embodiment of the invention takes the FDN water reducing agent and the explosion-proof organic fiber as additives. In the admixture, the FDN water reducing agent has excellent water reducing effect and is beneficial to improving the overall strength of the material, and the explosion-proof organic fiber has the effect of being beneficial to discharging water and preventing the local burst of the material.
The practice proves that the granularity grading of the aggregate in the castable has important influence on the performance of the castable, continuous particle close packing is formed by strictly controlling the granularity grading of the fused white corundum, the plate-shaped corundum and the fused compact corundum and the weight ratio of the fused white corundum, the plate-shaped corundum and the fused compact corundum to various fine powders, the densification of the castable is realized to the maximum extent, the castable has higher normal temperature strength and hot high temperature strength, and the castable can be suitable for the severe environment of a steel mill.
According to the castable for the tundish slag-stopping wall, provided by the invention, by optimizing the component design and controlling the using amount, and simultaneously introducing large-particle aggregate and optimizing the particle size distribution of the aggregate, by adopting the component design, the castable with higher normal-temperature strength and high-temperature thermal-state strength can be obtained, the normal-temperature flexural strength is more than 11MPa, the high-temperature flexural strength is more than 6MPa, and the service life of the tundish slag-stopping wall can be effectively prolonged.
The embodiment of the invention also provides a preparation method of the castable.
Referring to fig. 1, a method for preparing a castable for a tundish slag-stopping wall includes:
step S101: uniformly mixing all the components in the main material; according to the weight ratio, the main materials comprise 45-75% of fused white corundum and/or tabular corundum, 5-15% of fused compact corundum, 1-10% of fused magnesia powder, 1-5% of spinel particles, 2-10% of spinel micro powder, 2-10% of activated alumina powder, 3-6% of calcium aluminate cement and 0.2-2% of silicon micro powder; wherein the particle sizes of the fused white corundum, the plate-shaped corundum and the fused compact corundum are all less than or equal to 15 mm;
step S102: adding a water reducing agent and explosion-proof organic fibers into the uniformly mixed main material and uniformly mixing to obtain a mixture; wherein the water reducing agent and the explosion-proof organic fiber are respectively 0.5-1% and 0.01-0.15% of the total weight of the main material;
step S103: adding water into the mixture for stirring, and inserting a vibrating rod for vibrating in the stirring process so as to facilitate air exhaust; wherein the addition amount of the water is 3-5% of the total weight of the mixture;
step S104: and (3) forming and maintaining the stirred mixture, and then keeping the temperature at 110 ℃ for 24 hours to obtain the castable.
Preferably, the stirred mixture is formed into a 40X 160mm strip sample.
Further, in the electro-fused white corundum and/or plate-shaped corundum, the particle size and the weight percentage of the particle size are respectively as follows: 10-20% of particles with the particle size of more than 8mm and less than or equal to 15mm, 5-20% of particles with the particle size of more than 5mm, 5-20% of particles with the particle size of more than 3mm, 10-20% of particles with the particle size of more than 1mm and less than or equal to 3mm, 5-20% of particles with the particle size of more than 0.1 and less than or equal to 1mm, and 5-30% of particles with the particle size of less than.
Further, in the fused dense corundum, the particle size and the weight percentage of the particles are respectively as follows: the particle size of more than 8mm and less than or equal to 15mm accounts for 10-30%, the particle size of more than 5mm and less than or equal to 8mm accounts for 5-20%, the particle size of more than 3mm and less than or equal to 5mm accounts for 5-30%, the particle size of more than 1 and less than or equal to 3mm accounts for 10-30%, and the particle size of more than 0.1 and less than or equal to 1mm accounts for 5.
Furthermore, the granularity of the fused magnesia powder is less than or equal to 0.1 mm; the particle size of the spinel particles is 0.1-1 mm; the granularity of the spinel micro powder is less than or equal to 25 mu m; the particle size of the active alumina powder is less than or equal to 0.1 mm.
Further, the water reducing agent is an FDN water reducing agent. The explosion-proof organic fiber is one or two of polypropylene fiber and polyethylene fiber.
The present invention is described in more detail below by way of examples. These examples are merely illustrative of the best mode of carrying out the invention and do not limit the scope of the invention in any way.
Example 1
75 percent of tabular corundum (wherein the granularity is more than 8 and less than or equal to 15mm and accounts for 20 percent, the granularity is more than 5 and less than or equal to 8mm and accounts for 10 percent, the granularity is more than 3 and less than or equal to 5mm and accounts for 20 percent, the granularity is more than 1 and less than or equal to 3mm and accounts for 18 percent, the granularity is more than 0.1 and less than or equal to 1mm and accounts for 12 percent, and the granularity is less
9 percent of fused dense corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 30 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 15 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 25 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 25 percent, and the grain size is more than 0.1 and less than or
3 percent of fused magnesia powder
1% of spinel particles
2 percent of superfine spinel micro powder
5 percent of active alumina powder
4 percent of calcium aluminate cement
1 percent of silicon micropowder
0.6 percent of additional FDN water reducing agent
0.10 percent of polypropylene fiber and 0.05 percent of polyethylene fiber are added
Example 2
68 percent of tabular corundum (wherein the granularity is more than 8 and less than or equal to 15mm and accounts for 10 percent, the granularity is more than 5 and less than or equal to 8mm and accounts for 20 percent, the granularity is more than 3 and less than or equal to 5mm and accounts for 20 percent, the granularity is more than 1 and less than or equal to 3mm and accounts for 10 percent, the granularity is more than 0.1 and less than or equal to 1mm and accounts for 16 percent, and the granularity is less
5 percent of fused dense corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 10 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 20 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 25 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 20 percent, and the grain size is more than 0.1 and less than or
5 percent of fused magnesia powder
Spinel particles 5%
5 percent of superfine spinel micro powder
5.5 percent of active alumina powder
6 percent of calcium aluminate cement
0.5 percent of silicon micropowder
Adding 1 percent of FDN water reducing agent
0.1 percent of polypropylene fiber is added
Example 3
60 percent of fused white corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 20 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 15 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 15 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 20 percent, the grain size is more than 0.1 and less than or equal to 1mm and accounts for 20 percent
15 percent of fused dense corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 30 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 10 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 30 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 10 percent, and the grain size is more than 0.1 and less than or
3 percent of fused magnesia powder
Spinel particles 3%
4 percent of superfine spinel micro powder
8.5 percent of active alumina powder
5 percent of calcium aluminate cement
1.5 percent of silicon micropowder
0.5 percent of additional FDN water reducing agent
0.1 percent of polypropylene fiber is added
Example 4
35 percent of fused white corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 15 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 15 percent, the grain size is more than 3 and less than or equal to 3mm and accounts for 20 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 15 percent, the grain size is more than 0.1 and less than or equal to 1mm and accounts for 5 percent
30 percent of tabular corundum (wherein the granularity is more than 8 and less than or equal to 15mm and 15 percent is more than 5 and less than or equal to 8mm, the granularity is more than 3 and less than or equal to 5mm and 20 percent is more than 3 and less than or equal to 5mm, the granularity is more than 1 and less than or equal to 3mm and 15 percent, the granularity is more than 0.1 and less than or equal to 1mm and 5 percent is less than or equal to 0.01mm
10 percent of fused dense corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 25 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 5 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 10 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 30 percent, and the grain size is more than 0.1 and less than or
1 percent of fused magnesia powder
Spinel particles 5%
9 percent of superfine spinel micro powder
4 percent of active alumina powder
5 percent of calcium aluminate cement
1 percent of silicon micropowder
0.8 percent of additional FDN water reducing agent
0.10 percent of polypropylene fiber and 0.05 percent of polyethylene fiber are added
Example 5
45 percent of fused white corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 20 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 5 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 10 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 20 percent, the grain size is more than 0.1 and less than or equal to 1mm and accounts for 20 percent
15 percent of fused dense corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 20 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 20 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 5 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 25 percent, and the grain size is more than 0.1 and less than or
10 percent of fused magnesia powder
Spinel particles 5%
6 percent of superfine spinel micro powder
7 percent of active alumina powder
6 percent of calcium aluminate cement
2 percent of silicon micropowder
Adding 1 percent of FDN water reducing agent
0.05 percent of polypropylene fiber is added
Example 6
40 percent of fused white corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 18 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 12 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 5 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 17 percent, the grain size is more than 0.1 and less than or equal to 1mm and accounts for 18 percent
26 percent of tabular corundum (wherein the granularity is more than 8 and less than or equal to 15mm and accounts for 18 percent, the granularity is more than 5 and less than or equal to 8mm and accounts for 12 percent, the granularity is more than 3 and less than or equal to 5mm and accounts for 5 percent, the granularity is more than 1 and less than or equal to 3mm and accounts for 17 percent, the granularity is more than 0.1 and less than or equal to 1mm and accounts for 18 percent, and the granularity is less
9 percent of fused dense corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 15 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 20 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 20 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 15 percent, and the grain size is more than 0.1 and less than or
8 percent of fused magnesia powder
Spinel particles 5%
5.8 percent of superfine spinel micro powder
2 percent of active alumina powder
3 percent of calcium aluminate cement
0.2 percent of micro silicon powder
0.5 percent of additional FDN water reducing agent
0.01 percent of polypropylene fiber is added
Example 7
30 percent of fused white corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 13 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 17 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 17 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 18 percent, the grain size is more than 0.1 and less than or equal to 1mm and accounts for 30 percent
25 percent of tabular corundum (wherein the granularity is more than 8 and less than or equal to 15mm and accounts for 13 percent, the granularity is more than 5 and less than or equal to 8mm and accounts for 17 percent, the granularity is more than 3 and less than or equal to 5mm and accounts for 17 percent, the granularity is more than 1 and less than or equal to 3mm and accounts for 18 percent, the granularity is more than 0.1 and less than or equal to 1mm and accounts for 30 percent, and the granularity is less
12 percent of fused dense corundum (wherein the grain size is more than 8 and less than or equal to 15mm and accounts for 30 percent, the grain size is more than 5 and less than or equal to 8mm and accounts for 20 percent, the grain size is more than 3 and less than or equal to 5mm and accounts for 15 percent, the grain size is more than 1 and less than or equal to 3mm and accounts for 20 percent, and the grain size is more than 0.1 and less than or
1 percent of fused magnesia powder
Spinel particles 5%
10 percent of superfine spinel micro powder
10 percent of active alumina powder
6 percent of calcium aluminate cement
1 percent of micro silicon powder
Adding 1 percent of FDN water reducing agent
0.05 percent of polypropylene fiber and 0.05 percent of polyethylene fiber are added
Selecting raw materials according to the components of the embodiments, uniformly mixing aggregate and a matrix material, adding an FDN water reducer and an explosion-proof organic fiber, uniformly mixing, adding water accounting for 3-5% of the total weight of the mixture, stirring, inserting a vibrating rod to vibrate in the stirring process so as to facilitate air exhaust, preparing the castable into a strip sample of 40 × 40 × 160mm, mixing, stirring, forming, maintaining, and carrying out heat treatment at 110 ℃ for 24 hours to obtain the castable.
The apparent porosity and the volume density of the castable are tested by adopting a method YB/T5200-1993; testing the normal-temperature breaking strength and the compressive strength of the castable by adopting a YB/T5201-1993 method; testing the line change rate of the castable by adopting a YB/T5203 + 1993 method; the high-temperature rupture strength of the castable is tested by adopting the method of GB/T3002-2007. The castable sample is kept warm for 2 hours in a 1550 ℃ rotary furnace by adopting a rotary slag-resistant method, a transverse section of the sample is cut, the slag corrosion index (slag alkalinity being 3.4) of the sample is tested, and 3 samples of each sample experiment are averaged. The performance of the castable in each example was tested, and the test results are shown in table 1.
Table 1 castable performance test results
The results in table 1 show that the slag erosion indexes (basicity: 3.4) of the castable for the tundish slag-stopping wall prepared in the embodiment of the invention are all less than 14% (14-17% of the conventional corundum castable), and the castable has good slag erosion resistance. The bulk density of the product exceeds 3.2g cm-3The apparent porosity is less than 14%, which shows that the structure is compact. The linear change rate is less than 0.5%, which indicates that the expansion and contraction properties are not large, and the construction is facilitated. The normal temperature strength and the high temperature strength are higher, the device can adapt to severe environment, the service life of the tundish is prolonged, the judging rate of the blank is reduced, the production cost is reduced, and the market competitiveness of the product is improved.
At present, the service life of a tundish of a No. 1 machine is 11 furnaces, the service life of a tundish of a No. 2 machine is 10 furnaces, and the molten steel of a first furnace of each tundish is degraded and sold (the difference price is 500 yuan/ton) according to the annual output of cord steel of 45 ten thousand tons and the weight of each molten steel is 115 tons. 22.5 million tons are finished according to the No. 1 machine and the No. 2 machine respectively, the service life of the tundish is calculated according to the 13 furnaces, and after the service life of the slag blocking wall is prolonged, more than 570 ten thousand yuan can be increased every year, so the castable and the slag blocking wall made of the castable have good industrialization prospects.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (5)
1. The castable for the tundish slag-stopping wall is characterized by comprising main materials and additives, wherein:
according to the weight ratio, the main materials comprise 45-75% of fused white corundum and/or tabular corundum, 5-15% of fused compact corundum, 1-10% of fused magnesia powder, 1-5% of spinel particles, 2-10% of spinel micro powder, 2-10% of activated alumina powder, 3-6% of calcium aluminate cement and 0.2-2% of silicon micro powder; wherein the particle sizes of the fused white corundum, the plate-shaped corundum and the fused compact corundum are all less than or equal to 15 mm;
the additive comprises a water reducing agent and explosion-proof organic fibers, and the dosage of the additive is 0.5-1% and 0.01-0.15% of the total weight of the main material respectively;
in the electric melting white corundum and/or the plate-shaped corundum, the particle size and the weight percentage of the particle size are respectively as follows: the particle size of more than 8 and less than or equal to 15mm accounts for 10-20%, the particle size of more than 5 and less than or equal to 8mm accounts for 5-20%, the particle size of more than 3 and less than or equal to 5mm accounts for 5-20%, the particle size of more than 1 and less than or equal to 3mm accounts for 10-20%, the particle size of more than 0.1 and less than or equal to 1mm accounts for 5-20%, and the particle size of less than or equal to 0.;
in the fused compact corundum, the particle size and the weight percentage of the fused compact corundum are respectively as follows: the particle size of more than 8mm and less than or equal to 15mm accounts for 10-30%, the particle size of more than 5mm and less than or equal to 8mm accounts for 5-20%, the particle size of more than 3mm and less than or equal to 5mm accounts for 5-30%, the particle size of more than 1 and less than or equal to 3mm accounts for 10-30%, and the particle size of more than 0.1 and less than or equal to 1mm accounts for 5;
the granularity of the fused magnesia powder is less than or equal to 0.1 mm; the particle size of the spinel particles is 0.1-1 mm; the granularity of the spinel micro powder is less than or equal to 25 mu m; the particle size of the active alumina powder is less than or equal to 0.1 mm.
2. The castable for tundish slag walls according to claim 1, wherein the water reducing agent is an FDN water reducing agent.
3. The castable for tundish slag wall according to claim 1, wherein the explosion-proof organic fiber is one or both of polypropylene fiber and polyethylene fiber.
4. A preparation method of a castable for a tundish slag-stopping wall is characterized by comprising the following steps:
uniformly mixing all the components in the main material; according to the weight ratio, the main materials comprise 45-75% of fused white corundum and/or tabular corundum, 5-15% of fused compact corundum, 1-10% of fused magnesia powder, 1-5% of spinel particles, 2-10% of spinel micro powder, 2-10% of activated alumina powder, 3-6% of calcium aluminate cement and 0.2-2% of silicon micro powder; wherein the particle sizes of the fused white corundum, the plate-shaped corundum and the fused compact corundum are all less than or equal to 15 mm;
in the electric melting white corundum and/or the plate-shaped corundum, the particle size and the weight percentage of the particle size are respectively as follows: the particle size of more than 8 and less than or equal to 15mm accounts for 10-20%, the particle size of more than 5 and less than or equal to 8mm accounts for 5-20%, the particle size of more than 3 and less than or equal to 5mm accounts for 5-20%, the particle size of more than 1 and less than or equal to 3mm accounts for 10-20%, the particle size of more than 0.1 and less than or equal to 1mm accounts for 5-20%, and the particle size of less than or equal to 0.;
in the fused compact corundum, the particle size and the weight percentage of the fused compact corundum are respectively as follows: the particle size of more than 8mm and less than or equal to 15mm accounts for 10-30%, the particle size of more than 5mm and less than or equal to 8mm accounts for 5-20%, the particle size of more than 3mm and less than or equal to 5mm accounts for 5-30%, the particle size of more than 1 and less than or equal to 3mm accounts for 10-30%, and the particle size of more than 0.1 and less than or equal to 1mm accounts for 5;
adding a water reducing agent and explosion-proof organic fibers into the uniformly mixed main material and uniformly mixing to obtain a mixture; wherein the water reducing agent and the explosion-proof organic fiber are respectively 0.5-1% and 0.01-0.15% of the total weight of the main material;
adding water into the mixture for stirring, and inserting a vibrating rod for vibrating in the stirring process so as to facilitate air exhaust; wherein the addition amount of the water is 3-5% of the total weight of the mixture;
and (3) forming and maintaining the stirred mixture, and then keeping the temperature at 110 ℃ for 24 hours to obtain the castable.
5. A slag dam produced using the castable material according to claim 1.
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