CN115504773A - Vibration-formed tundish slag-suction filtering separator and preparation method thereof - Google Patents
Vibration-formed tundish slag-suction filtering separator and preparation method thereof Download PDFInfo
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- B22D43/001—Retaining slag during pouring molten metal
- B22D43/004—Retaining slag during pouring molten metal by using filtering means
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- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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Abstract
The invention relates to a vibration-formed tundish slag-absorbing filtering separator and a preparation method thereof, wherein the separator is prepared from the following raw materials, by weight, 50-70 parts of waste corundum silicon carbide brick reclaimed material with the particle size of 8-0 mm, 5-20 parts of synthetic magnesia-calcium sand with the particle size of 3-0 mm, 8-20 parts of fused white corundum powder, 2-8 parts of compound alumina micro powder, 3-10 parts of pure calcium aluminate cement, 1-6 parts of silicon micro powder, 2-8 parts of spherical asphalt, 2-6 parts of a composite additive, 0.1-0.6 part of a high-efficiency water reducing agent, 0.05-0.5 part of anti-explosion fiber and 0.5-3 parts of stainless steel fiber. The pouring material is uniformly mixed and poured into a mould for vibration molding, and the tundish slag-absorbing filtering separator is prepared by a reasonable curing and drying system. The invention has the advantages of low environmental requirement of production site, low capital investment, high production efficiency, good product appearance, high strength, light reaming degree of the steel through hole and difficult blockage.
Description
Technical Field
The invention relates to the technical field of refractory materials for a tundish, in particular to a vibration-formed tundish slag-suction filtering separator and a preparation method thereof.
Background
The continuous casting tundish is an intermediate link of a steelmaking production flow, is the last refractory material container passed by the steel before solidification, and plays an important role in improving the steel quality. The tundish is required to remove non-metallic inclusions in molten steel as much as possible, prevent the molten steel from absorbing oxygen in air and refractory materials, and avoid secondary oxidation, so as to meet the quality requirement of clean steel.
At present, slag dams are generally arranged in continuous casting tundishes of domestic steel mills, and the arrangement of the slag dams can improve the flowing track of molten steel, enable the molten steel to flow along a steel slag interface, shorten the floating distance of impurities and facilitate the absorption of slag; but also increases the residence time of the molten steel in the tundish and improves the separation rate of the inclusions. However, in actual production, a stagnation area where molten steel is inactive exists at the bottom of the tundish, and inclusions are difficult to float upwards, so even though a slag stopping wall is arranged in the tundish, the inclusions at the bottom are still difficult to eliminate, and the quality of a casting blank is still difficult to ensure. In order to solve the problems, in some domestic steel mills, the traditional slag blocking wall is arranged in a continuous casting tundish, and a slag suction filtering separator is also arranged at the bottom of the tundish and is matched with the slag blocking wall for use. After the slag suction filter separator is arranged, molten steel in the tundish flows from the impact area to the steel casting area through the steel through hole in the slag suction filter separator, and the flowing speed of the molten steel is slowed down, so that the residence time of the molten steel in the tundish is prolonged, more reaction and adsorption time is provided for removing impurities in the molten steel stagnant at the bottom of the tundish, and the cleanliness of the molten steel and the quality of casting blanks can be effectively improved.
The tundish slag-absorbing filtering separator in the prior art generally adopts isostatic pressing, the isostatic pressing is expensive in equipment and complex in production process, pug generally needs to be granulated and dried, the pug generally needs to be vacuumized after being filled into a mold, a blank generally has irregular appearance and needs to be polished, the heat treatment process needs two links of drying and firing, the production period is long, the number of related equipment is large, and the investment is large. And because of the isostatic compaction characteristics, the limit particle size of the pug is small, and the impact resistance at high temperature is poor, so that the hole reaming of the steel through hole of the tundish slag-absorbing filtering separator is serious.
The patent document of the invention patent CN202010282507.6 discloses a composite tundish slag absorption filter and a production method, the composite slag absorption filter is formed by compounding a filter cylinder and a body, the whole production method is carried out in two steps, the first step is to manufacture the filter cylinder, and the filter cylinder is prepared by sintering in a pre-sintering and reducing atmosphere after isostatic pressing; and the second step is to manufacture the slag suction filter, and the slag suction filter is manufactured through the working procedures of filter cylinder installation, casting and molding of casting materials, maintenance, demolding, drying and the like. The invention has the following defects: the production process is complicated, more equipment is needed, particularly isostatic pressing equipment is needed, the equipment investment cost is high, the production procedures are more, the production period is long, and the production cost is high.
Disclosure of Invention
The invention aims to provide a vibration-formed tundish slag-suction filtering separator and a preparation method thereof. The tundish slag-absorbing filtering separator produced by the invention has the advantages of low requirement on production site environment, simple production equipment, less equipment capital investment, simple production process, short production period, high production efficiency, good product appearance, high strength, light reaming degree of the steel through holes and difficult blockage, the reaming rate of the steel through holes is reduced by more than 30%, the blockage rate of the steel through holes is reduced by more than 40%, and the production cost is reduced by more than 20%.
In order to achieve the purpose, the invention adopts the following technical scheme:
a vibration-molded tundish slag absorption filter separator is prepared from the following raw materials in parts by weight: 50-70 parts of waste corundum silicon carbide brick reclaimed material with the particle size of 8-0 mm, 5-20 parts of synthetic magnesia-calcium sand with the particle size of 3-0 mm, 8-20 parts of fused white corundum powder, 2-8 parts of compound alumina micropowder, 3-10 parts of pure calcium aluminate cement, 1-6 parts of silicon micropowder, 2-8 parts of spherical asphalt, 2-6 parts of composite additive, 0.1-0.6 part of high-efficiency water reducing agent, 0.05-0.5 part of anti-burst fiber and 0.5-3 parts of stainless steel fiber.
The composite additive is one or more of metal aluminum powder, metal silicon powder and metal chromium powder.
The compound alumina micro powder is one or more of activated alumina micro powder, calcined alumina micro powder and bimodal alumina micro powder.
The high-efficiency water reducing agent is one or more of polyacrylate and polycarboxylate.
The anti-burst fiber is polypropylene fiber with the length of 2 mm-6 mm.
The diameter phi 1 of a steel inlet of the steel hole of the slag suction filter separator is 90 mm-120 mm, the diameter phi 2 of the steel outlet is 75mm-110 mm, and the diameter phi 1 of the steel inlet of the steel hole is larger than the diameter phi 2 of the steel outlet.
Al in the waste corundum silicon carbide brick 2 O 3 ≥82％，SiC≥5％。
The chemical components of the main raw materials in the castable are shown in table 1;
TABLE 1 chemical composition of main raw materials
A preparation method of a vibration-molded tundish slag absorption filter separator comprises the following steps:
1) Assembling a slag absorbing and filtering separator die, and uniformly brushing demoulding oil on the inner wall of the die and the die core;
2) Adding various raw materials of the castable of the slag-absorbing filtering separator into the castable in proportion to prepare the castable, and premixing the compound alumina micropowder, the composite additive, the pure calcium aluminate cement, the spherical asphalt, the silica fume powder and the high-efficiency water reducing agent to prepare premixed powder for later use;
3) Mixing the casting material by using a planetary mixer, adding the aggregate and the powder, mixing for 1-5 minutes, adding the premixed powder, mixing for 1-5 minutes, then adding the anti-burst fiber and the stainless steel fiber, mixing for 1-5 minutes, and finally adding water to mix for 3-8 minutes;
4) Pouring the casting material, placing the mould on a table type vibrator, then uniformly adding the casting material into the mould, starting the vibrator to set the amplitude of 35-50 HZ to vibrate when the height of the casting material reaches 1/4-1/3 of the height of the mould, then, continuously distributing the materials in the mold while vibrating until the height of the castable is flush with the upper edge of the mold, then adjusting the amplitude of a vibrator to 10-25 HZ, and continuously vibrating for 2-5 minutes until the surface of the castable returns to slurry evenly and gas is fully discharged;
5) Covering and wrapping the casting body and the mold by using a plastic film to achieve the purpose of ensuring the ambient humidity of the casting body, and carrying out natural curing for the first time for 3-5 hours;
6) Demolding the tundish slag-absorbing filtering separator L-shaped steel hole mold core;
7) After the steel hole mold core is demoulded, the mold is continuously placed into a curing kiln for secondary curing, the curing temperature is 35-60 ℃, and the curing time is 15-24 hours;
8) Demolding the outer side mold of the casting body;
9) Continuously placing the demoulded product into a curing kiln for curing for the third time, wherein the curing time is 24-48 hours;
10 Placing the cultured product into a shuttle drying kiln for drying at the drying temperature of 280-450 ℃ for 45-65 hours;
11 Drawing out of the kiln and packaging.
Compared with the prior art, the invention has the beneficial effects that:
1) The tundish slag-absorbing filtering separator adopts vibration molding, and compared with the traditional isostatic pressing equipment molding, the tundish slag-absorbing filtering separator has the advantages of simple production process, high production efficiency, low equipment cost investment, good product appearance, no need of subsequent machining and the like, and the production cost can be reduced by more than 20%.
2) The slag-absorbing filtering separator is formed by vibration, compared with an isostatic pressing product, the raw material type and the limit granularity of the slag-absorbing filtering separator are wider in selection range, so that the adsorption and filtration capacity of the slag-absorbing filtering separator on inclusions in molten steel can be enhanced by proper raw material selection, the high-temperature performances of the slag-absorbing filtering separator, such as erosion resistance, erosion resistance and the like, can be improved by methods of increasing the limit granularity of castable and the like, the phenomena of hole expansion and blockage of a steel through hole in the use process are effectively avoided, the hole expansion rate of the steel through hole can be reduced by more than 40%, and the blockage rate of the steel through hole can be reduced by more than 30%.
3) The vibration forming tundish slag-absorbing filtering separator has a short production period, generally 5-7 days, and the isostatic pressing forming has a long production period, generally 10-12 days, and the production period is obviously shortened, so that the production efficiency is greatly improved.
4) The vibration forming tundish slag absorption filtering separator can be used after being dried, and an isostatic pressing product needs to be fired at high temperature after being dried generally.
5) The invention introduces MgO and CaO by adding the synthesized magnesia-calcium sand, because the free CaO can be mixed with Al in the molten steel 2 O 3 And S, P, and other impurities react to generate a low-melting-point compound which floats to the surface of the molten steel and is absorbed by the covering agent, so that the impurities in the molten steel are effectively reduced, and the molten steel is purified. MgO and Al in corundum simultaneously 2 O 3 The reaction produces the in-situ spinel, greatly improves the erosion resistance and the permeability resistance of the slag-absorbing filter separator at high temperature, reduces the mutual solubility between molten steel and refractory materials, and improves the cleanliness of the molten steel.
6) The invention adopts the waste corundum silicon carbide brick reclaimed material, not only reduces the raw material cost of the product, but also develops the regeneration and utilization technology of the waste refractory material, conforms to the national industrial policies of circular economy, energy conservation and emission reduction, and has better economic and social benefits.
Drawings
FIG. 1 is a flow chart of the production process of the present invention.
FIG. 2 is a schematic structural diagram of the tundish slag-absorbing filtering separator of the invention.
In the figure:steel tapping hole with 1-through steel hole and 2-through steel hole
2. 3-steel outlet surface, 4-steel inlet surface and 5-steel hole steel outlet
1。
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention:
the invention relates to a vibration-formed tundish slag-absorbing filtering separator which is prepared by pouring and mixing uniform pouring materials in an assembled mould and performing production processes such as vibration forming, demoulding of a steel-hole mould core, demoulding of a body mould, curing and drying and the like, wherein the production process flow is shown in figure 1.
The invention is respectively used on a 65-ton tundish and a 50-ton tundish of a certain iron and steel group company, the hole expanding rate and the blocking rate of the through steel holes are obviously reduced, and the service performance is obviously improved.
The specific embodiment is as follows:
the invention provides a pouring material for pouring a tundish slag-absorbing filtering separator, which is poured and mixed uniformly in an assembled mould, and the tundish slag-absorbing filtering separator formed by vibration is prepared by the production processes of vibration forming, demoulding of a steel-hole-passing mould core, demoulding of an outer side mould, health preserving, drying, packaging and the like.
The pouring material of the tundish slag-absorbing filtering separator is composed of the following raw materials in parts by weight as shown in Table 2.
TABLE 2 castable composition for residue-absorbing filter separator
| Name of raw materials | Particle size, mm | Adding the components in parts by weight |
| Waste corundum silicon carbide brick reclaimed material | 8-0 | 55 |
| Synthetic magnesia-calcium sand | 3-0 | 10 |
| Electric white corundum powder | 12.5 | |
| |
4 | |
| Pure calcium aluminate cement | 6 | |
| |
3 | |
| |
4 | |
| Composite additive | 3.6 | |
| High-efficiency water reducing agent | 0.2 | |
| Anti-burst fiber | 0.2 | |
| Stainless steel fiber | 1.5 |
The chemical components of the main raw materials in the castable are shown in table 3.
TABLE 3 chemical composition of main raw materials
The composite additive in the casting material consists of metal aluminum powder and metal silicon powder.
The compound alumina micro powder consists of active alumina micro powder and calcined alumina micro powder.
The high-efficiency water reducing agent is a sodium polyacrylate water reducing agent.
The anti-burst fiber in the casting material is polypropylene fiber with the length of 4 mm.
The diameter phi 1 of a steel inlet of the slag-absorbing filtering separator through a steel hole is 100mm, and the diameter phi 2 of a steel outlet is 90mm.
A pouring formed tundish slag-suction filtering separator comprises the following preparation processes:
1) Assembling a slag-absorbing filtering separator mould, and uniformly brushing demoulding oil on the inner wall of the mould and the mould core;
2) Adding various raw materials of the castable of the slag-absorbing filtering separator into the castable in proportion to prepare the castable, and premixing the compound alumina micropowder, the composite additive, the pure calcium aluminate cement, the spherical asphalt, the silica fume powder and the high-efficiency water reducing agent to prepare premixed powder for later use;
3) Mixing the casting materials by using a planetary mixer, adding aggregate and powder, mixing for 1 minute, adding a composite additive premix, mixing for 2 minutes, adding anti-explosion fiber and stainless steel fiber, mixing for 3 minutes, and adding water to carry out pug mixing for 5 minutes;
4) Pouring the castable, namely placing the mould on a table type vibrator, uniformly adding the castable into the mould, starting the vibrator to set the amplitude to be 45HZ for vibration when the height of the castable reaches 1/3 of the height of the mould, continuously distributing the castable in the mould while vibrating until the height of the castable is flush with the upper edge of the mould, adjusting the amplitude of the vibrator to be 15HZ, and continuously vibrating for 3 minutes until the surface of the castable returns to slurry uniformly and gas is fully exhausted;
5) Covering and wrapping the casting body and the mold by using a plastic film to achieve the purpose of ensuring the ambient humidity of the casting body, and naturally curing for 1 time for 3.5 hours;
6) Demolding the tundish slag-absorbing filtering separator L-shaped steel hole mold core;
7) After demoulding the steel hole mold core, continuously placing the mold into a curing kiln for secondary curing for 2 hours at the curing temperature of 45 ℃;
8) Demolding the outer side mold of the casting body;
9) Continuously placing the demoulded product into a curing kiln for curing for three times for 3 times, wherein the curing time is 30 hours;
10 Placing the cultured product into a shuttle drying kiln for drying at 320 ℃ for 52 hours;
11 Drawing out of the kiln and packaging. The preparation of the vibration-molded tundish slag-absorbing filtering separator is completed.
The statistics of the hole-through expanding rate and the blocking rate of the steel hole of the front and rear tundish slag-absorbing filtering separators used by a certain iron and steel group company in the embodiment are shown in tables 4 and 5.
TABLE 4 situation of hole expansion rate of steel through hole of front and rear tundish slag-suction filtering separators using the present invention
TABLE 5 clogging of the through steel for the front and rear tundish slag suction filtration separators of the present invention
The tundish slag-absorbing filtering separator adopts vibration molding, the vibration molding production mode has simple equipment, less equipment, lower price, less overall investment, convenient operation and easy maintenance. And by reasonably selecting the process parameters and the vibration molding parameters, a blank with higher and more uniform density, lower porosity, higher strength, regular appearance and complete edge angles can be obtained, the rejection rate of the blank is low, and the production efficiency is high. The pressure and the friction force of the vibration forming on the die are very small, and the requirement on the material of the die is not high, so that the cost of the die is low, the service life of the die is long, and the production and manufacturing cost can be effectively reduced.
The shape of the steel through hole of the tundish slag-absorbing filtering separator is designed to be advanced, the diameter of the molten steel inlet phi 1 is designed to be 5-20mm larger than that of the molten steel outlet phi 2 on the premise of meeting the requirement of a molten steel flow field in a tundish by adopting a pore diameter design mode of unequal diameters of a steel inlet phi 1 and a steel outlet phi 2, the design can properly prolong the residence time of the molten steel in the steel through hole, provide more sufficient time for the slag-absorbing filtering separator to absorb impurities in the molten steel, enhance the purification effect of the tundish slag-absorbing filtering separator on the molten steel and improve the cleanliness degree of the molten steel.
The invention has no strict requirements on a production plant, can be produced in a simple plant, explores an effective method for ensuring the production quality of products under the condition of poor moisturizing effect of the plant, namely, in order to provide a good humidity environment for a casting body, the invention adopts a simple moisturizing method, namely, when the casting body and a mould are covered and wrapped by a plastic film during the first natural curing after the products are formed by vibration, thereby creating a constant humidity environment, providing sufficient time for cement hardening reaction in the casting material, and ensuring the uniformity of the hardening strength inside and outside the casting body. The method for preserving moisture and health of the casting body has the advantages of good effect, low cost and reduction of the requirement on the environment of a production plant.
According to the invention, siC is introduced by adding the corundum silicon carbide waste, and the addition of the silicon carbide can greatly improve the thermal shock stability, softening temperature, wear resistance, erosion resistance and the like of the slag-absorbing filtering separator, effectively reduce the reaming degree of the steel through hole on the slag-absorbing filtering separator and greatly prolong the service life of the slag-absorbing filtering separator.
Claims (8)
1. The vibration-formed tundish slag-absorbing filtering separator is characterized by being prepared from the following raw materials in parts by weight: 50-70 parts of waste corundum silicon carbide brick reclaimed material with the particle size of 8-0 mm, 5-20 parts of synthetic magnesia-calcium sand with the particle size of 3-0 mm, 8-20 parts of fused white corundum powder, 2-8 parts of compound alumina micropowder, 3-10 parts of pure calcium aluminate cement, 1-6 parts of silicon micropowder, 2-8 parts of spherical asphalt, 2-6 parts of composite additive, 0.1-0.6 part of high-efficiency water reducing agent, 0.05-0.5 part of anti-burst fiber and 0.5-3 parts of stainless steel fiber.
2. The vibration-formed tundish slag-absorbing filtering separator according to claim 1, wherein the composite additive is one or more of metal aluminum powder, metal silicon powder and metal chromium powder.
3. The vibration forming tundish slag suction filter separator according to claim 1, the compound alumina micro powder is one or more of activated alumina micro powder, calcined alumina micro powder and bimodal alumina micro powder.
4. The vibration-formed tundish slag-absorbing filtering separator according to claim 1, wherein the high-efficiency water reducing agent is one or more of polyacrylate and polycarboxylate.
5. The vibration-forming tundish slag-suction filtering separator according to claim 1, wherein the anti-burst fiber is polypropylene fiber with a length of 2mm to 6 mm.
6. The vibration-formed tundish slag-sucking filtering separator according to claim 1, wherein the diameter of the steel-feeding hole phi 1 is = 90mm-120 mm, the diameter of the steel-feeding hole phi 2 is = 75mm-110 mm, and the diameter of the steel-feeding hole phi 1 is larger than the diameter of the steel-feeding hole phi 2.
7. The vibration-molding tundish slag-suction filtering separator according to claim 1, wherein Al in the waste corundum silicon carbide brick is 2 O 3 ≥82％，SiC≥5％。
8. A method for manufacturing a vibro-molded tundish suction slag filter separator according to any one of claims 1 to 7, characterized in that it comprises the following method steps:
1) Assembling a slag absorbing and filtering separator die, and uniformly coating a release agent on the inner wall of the die and the die core;
2) Adding various raw materials of the castable of the slag-absorbing filtering separator into the castable in proportion to prepare the castable, and premixing the compound alumina micropowder, the composite additive, the pure calcium aluminate cement, the spherical asphalt, the silica fume powder and the high-efficiency water reducing agent to prepare premixed powder for later use;
3) Mixing the casting materials, namely adding the aggregate and the powder, mixing for 1-5 minutes, then adding the premixed powder, mixing for 1-5 minutes, then adding the anti-explosion fiber and the stainless steel fiber in a redispersion manner, mixing for 1-5 minutes, and finally adding water to carry out pug mixing for 3-8 minutes;
4) Pouring the casting material, namely placing the mould on a table type vibrator, uniformly adding the casting material into the mould, starting the vibrator to set the amplitude of 35-50 HZ for vibration when the height of the casting material reaches 1/4-1/3 of the height of the mould, continuously distributing the material in the mould while vibrating until the height of the casting material is flush with the upper edge of the mould, and then adjusting the amplitude of the vibrator to 10-25 HZ for continuously vibrating for 2-5 minutes;
5) Covering and wrapping the casting body and the mold by using a plastic film to achieve the purpose of ensuring the ambient humidity of the casting body, and carrying out natural curing for the first time for 3-5 hours;
6) Demolding the tundish slag-absorbing filtering separator L-shaped steel hole mold core;
7) After the steel hole die core is demoulded, continuously placing the die into a curing kiln for secondary curing, wherein the curing temperature is 35-60 ℃, and the curing time is 15-24 hours;
8) Demolding the outer side mold of the casting body;
9) Continuously placing the demoulded product into a curing kiln for curing for the third time, wherein the curing time is 24-48 hours;
10 Placing the cultured product into a shuttle drying kiln for drying at the drying temperature of 280-450 ℃ for 45-65 hours.
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| CN112624743A (en) * | 2020-08-24 | 2021-04-09 | 河南熔金高温材料股份有限公司 | Sliding plate brick for slag blocking of converter steel tapping hole formed by casting and production method |
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| JPH04300055A (en) * | 1991-03-27 | 1992-10-23 | Kawasaki Steel Corp | Device for eliminating non-metallic inclusion contained in molten metal |
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