CN108115123B - Maintenance method for working layer of straight barrel slag line area of torpedo ladle - Google Patents
Maintenance method for working layer of straight barrel slag line area of torpedo ladle Download PDFInfo
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- CN108115123B CN108115123B CN201711181676.5A CN201711181676A CN108115123B CN 108115123 B CN108115123 B CN 108115123B CN 201711181676 A CN201711181676 A CN 201711181676A CN 108115123 B CN108115123 B CN 108115123B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/02—Linings
- B22D41/023—Apparatus used for making or repairing linings
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
- C04B35/185—Mullite 3Al2O3-2SiO2
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
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- Structural Engineering (AREA)
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- Mechanical Engineering (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Ceramic Products (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention relates to the technical field of maintenance of torpedo cars, in particular to a maintenance method of a working layer of a straight barrel slag line area of a torpedo car. The maintenance method comprises the following steps: 1) overhaul and maintain when torpedo ladle life 650 ~ 700 times, 2) the residue clearance, 3) the pouring work layer, 4) stage baking and heat preservation: heating the mixture from room temperature to 350-420 ℃, wherein the heating time is not less than 14 hours, and the heat preservation time at 350-420 ℃ is not less than 6 hours; raising the temperature from 350-420 ℃ to 1000-1150 ℃, heating for more than or equal to 23 hours, and keeping the temperature at 1000-1150 ℃ for more than or equal to 2 hours; reducing the temperature from 1000-1150 ℃ to 980-1000 ℃, the temperature reduction time is more than or equal to 2 hours, and the heat preservation time is more than or equal to 4 hours at 980-1000 ℃. The invention can reduce the consumption of refractory materials, shorten the maintenance time and reduce the working strength on the premise of ensuring the service life of the torpedo tank.
Description
Technical Field
The invention relates to the technical field of maintenance of torpedo cars, in particular to a maintenance method of a working layer of a straight barrel slag line area of a torpedo car.
Background
The torpedo ladle is a large-scale molten iron transportation device, and can be used for desulfurization treatment, loading and conveying molten iron; the torpedo tank can be generally divided into an impact area (a straight cylinder part is over against a tank opening area), a slag line area (a straight cylinder part, a tank top and an area close to the tank opening) and a general area (a cone part) according to the used part of the torpedo tank. The maintenance mode of the torpedo tank is different generally due to the difference of the damage degree, the damage part and the use environment of the torpedo tank.
For the torpedo tank for loading and transporting molten iron, because the loading amount of the molten iron is large, the molten iron is flushed by the movement of the molten iron in the tank and the molten iron when the molten iron is poured into an iron ladle in the transportation process, the damage to the working layer of the straight slag line area is very serious, and in order to ensure the safe operation of the torpedo tank, the whole replacement of aluminum silicon carbide carbon bricks is usually carried out on the working layer area of the straight slag line area when the torpedo tank is repaired. According to certain steel plant torpedo jar statistics, its 260 tons of torpedo jar molten iron load capacity is about 240 tons, life is more than 1400 times, carry out the medium repair about 750 times, mainly wholly change the brick body on straight section of thick bamboo slag line district working layer, this regional incomplete brick thickness is at 90 ~ 110mm, trade the brick volume at 8 ~ 9 tons, change time is about 48 hours, this intensity of labour that has not only increased the workman, has also influenced the turnover operation of torpedo jar.
The invention discloses a method for maintaining and building a 320-ton cone working layer of a torpedo tank, which is a Chinese patent with an authorization publication number of CN 103350221. The part of the invention to be maintained is a cone working layer of the torpedo ladle, and the maintenance mode of masonry bricks is adopted; the maintenance mode of the masonry bricks has the disadvantages of high labor intensity of workers, high consumption of refractory materials and long maintenance time.
Disclosure of Invention
In order to solve the above problems, the present invention aims to provide a maintenance method for a working layer of a straight slag line area of a torpedo ladle, which can reduce the consumption of refractory materials, shorten the maintenance time and reduce the working strength on the premise of ensuring the service life of the torpedo ladle.
In order to achieve the aim, the maintenance method of the working layer of the straight-barrel slag line area of the torpedo ladle, which is designed by the invention, comprises the following steps:
1) maintenance time: the torpedo ladle is maintained and repaired when the service life of the torpedo ladle is 650-700 times, and the thickness of residual bricks on a working layer in a straight slag line area is more than or equal to 120 mm;
2) cleaning residues: cleaning residual iron on a working layer of a straight barrel slag line area;
3) casting a working layer: adding water into the steel fiber mullite castable and uniformly stirring to obtain casting liquid, respectively casting the casting liquid on the working layers on the two sides of the straight slag line area of the torpedo ladle, and naturally drying;
4) stage baking and heat preservation:
baking in the first stage: uniformly heating the mixture from room temperature to 350-420 ℃, wherein the heating time is more than or equal to 14 hours, and the heat preservation time is more than or equal to 6 hours at the temperature of 350-420 ℃;
baking in the second stage: uniformly heating the mixture from 350-420 ℃ to 1000-1150 ℃, heating for more than or equal to 23 hours, and keeping the temperature at 1000-1150 ℃ for more than or equal to 2 hours;
baking in the third stage: uniformly cooling from 1000-1150 ℃ to 980-1000 ℃, wherein the cooling time is more than or equal to 2 hours, and the heat preservation time is more than or equal to 4 hours at the temperature of 980-1000 ℃.
Compared with the prior art, the maintenance time is adjusted, the traditional maintenance time with the service life of about 750 times is advanced to 650-700 times, and the maintenance time with the service life of 650-700 times is selected for maintenance, so that the thickness of residual bricks on a working layer of a straight barrel slag line area of the torpedo ladle is more than or equal to 120mm, and the residual thickness of the bricks is too thin, so that the bricks are easy to fall off in the construction process, potential safety hazards are caused, and the subsequent pouring process of a pouring material is influenced; in addition, the three-stage baking process is adopted to integrate various factors (including the characteristics of castable unshaped refractory materials, the structural characteristics of the working layer of the straight-barrel slag line area of the torpedo tank and the influence on residual bricks on the working layer of the straight-barrel slag line area of the torpedo tank), so that not only is the moisture of the castable of the working layer of the straight-barrel slag line area of the torpedo tank fully discharged, but also the castable, the working layer of the straight-barrel slag line area of the torpedo tank and the residual bricks are sintered into a solid whole through the three-stage baking of the invention, and the service life of the working layer of the straight-barrel slag line area of the torpedo tank is ensured.
Further, in the step 1), the torpedo tank is overhauled and maintained 660-675 times in service life, and the thickness of the residual bricks of the working layer of the straight-barrel slag line area is ensured to be 122-130 mm.
Further, in the step 3), pouring liquid is poured on the left working layer of the slag line area of the straight cylinder of the torpedo tank firstly, the pouring thickness is 80-100 mm, the vibrating rod is used for vibrating for 2-3 min and naturally drying for 20-30 h, and then the pouring liquid is poured on the right working layer of the slag line area of the straight cylinder of the torpedo tank, the pouring thickness is 80-100 mm, the vibrating rod is used for vibrating for 2-3 min and naturally drying for 20-30 h.
Further, in the step 4):
baking in the first stage: uniformly heating the mixture from the room temperature to 390-410 ℃, wherein the heating time is 14-15.5 hours, and the heat preservation time is 6-6.5 hours at the temperature of 390-410 ℃;
baking in the second stage: uniformly heating to 1050-1120 ℃ from 390-410 ℃, heating for 24-25 hours, and keeping the temperature at 1050-1120 ℃ for 2-2.5 hours;
baking in the third stage: uniformly cooling from 1050-1120 ℃ to 980-990 ℃, wherein the cooling time is 2-2.2 hours, and the heat preservation time is 4-4.5 hours at the temperature of 980-990 ℃.
Further, Al in the steel fiber mullite castable2O3The weight percentage content of the compound is more than or equal to 68 percent; the volume density of the product treated at 110 ℃ for 24 hours is more than or equal to 2.6g/cm3The normal temperature compressive strength is more than or equal to 45Mpa, and the volume density is more than or equal to 2.55g/cm after 1400 ℃ multiplied by 3h treatment3The apparent porosity is less than or equal to 15 percent, and the normal-temperature compressive strength is more than or equal to 50 Mpa. The invention further limits the Al of the fiber mullite castable2O3The indexes of weight percentage, volume density, normal temperature compressive strength, apparent porosity and the like enable the performance of the casting material to better meet the use requirement of the torpedo ladle, the sintering performance and the scouring resistance are good, the casting material can be well attached to the surface of a brick body at high temperature, and the service life of the torpedo ladle is ensured.
Further, the weight ratio of the steel fiber mullite castable to water in the casting liquid is 100: 5-6.
The invention has the advantages that: the method mainly takes the pouring liquid construction of the unshaped refractory material as a main part, and compared with the traditional method for integrally replacing the aluminum silicon carbide carbon brick, the labor intensity of workers is reduced, the maintenance time is shortened, and the consumption of refractory materials is reduced; in addition, the invention ensures that the castable, the working layer of the straight barrel slag line area of the torpedo ladle and the residual bricks are sintered into a solid whole through three stages of baking and heat preservation processes, thereby ensuring the service life of the working layer of the straight barrel slag line area of the torpedo ladle.
Detailed Description
For a better understanding of the present invention, reference will now be made in detail to the present invention, which is illustrated in the accompanying drawings.
The invention provides a maintenance method of a working layer of a straight-barrel slag line area of a torpedo ladle, which aims to solve the problems of high labor intensity of workers, high consumption of refractory materials and long maintenance time in the technology of integrally replacing aluminum silicon carbide carbon bricks in the working layer area of the straight-barrel slag line area during repair of the existing torpedo ladle. Specifically, the maintenance method of the working layer of the straight-barrel slag line area of the torpedo ladle adopts steel fiber mullite castable to be poured on two sides of the working layer of the straight-barrel slag line area of the torpedo ladle by resetting the optimal maintenance time and adopts a proper baking procedure to bake the pouring liquid. The preferred mode of the method for maintaining the working layer in the straight slag line area of the torpedo ladle according to the present invention will be described in detail below with reference to specific examples.
The comparative example used a conventional medium maintenance method: when the torpedo ladle is used in a 700-750 furnace, the furnace is stopped, the ladle is cooled, all the bricks (close to the area with serious erosion at the ladle opening) of the slag line area in the straight barrel area are removed, and new bricks of the slag line area are built again.
Example 1
The maintenance method of the working layer of the straight barrel slag line area of the torpedo ladle comprises the following steps:
1) maintenance time: the torpedo ladle is maintained and overhauled when the service life of the torpedo ladle is 650 times, and the thickness of residual bricks of a working layer in a straight slag line area is ensured to be 140 mm;
2) cleaning residues: cleaning residual iron on a working layer of a straight barrel slag line area;
3) casting a working layer: adding water into the steel fiber mullite castable, and uniformly stirring to obtain a casting solution, wherein the weight ratio of the steel fiber mullite castable to the water in the casting solution is 100: 5;
wherein, Al in the steel fiber mullite castable2O3The weight percentage content of the compound is 68 percent; the bulk density after the treatment at 110 ℃ for 24h is 2.6g/cm3, the normal-temperature compressive strength is 45Mpa, the bulk density after the treatment at 1400 ℃ for 3h is 2.55g/cm3, the apparent porosity is 15%, and the normal-temperature compressive strength is 50 Mpa;
pouring the casting liquid on the working layer on the left side of the straight barrel slag line area of the torpedo ladle, wherein the pouring thickness is 80mm, vibrating the working layer for 2min by using a vibrating rod, naturally airing the working layer for 20h, pouring the casting liquid on the working layer on the right side of the straight barrel slag line area of the torpedo ladle, wherein the pouring thickness is 80mm, vibrating the working layer for 2min by using the vibrating rod, and naturally airing the working layer for 20 h;
4) stage baking and heat preservation:
baking in the first stage: uniformly heating the mixture from room temperature to 350 ℃, wherein the heating time is 14 hours, and the heat preservation time is 6 hours at the temperature of 350 ℃;
baking in the second stage: uniformly heating from 350 ℃ to 1000 ℃, heating for 23 hours, and keeping the temperature at 1000 ℃ for 2 hours;
baking in the third stage: uniformly cooling from 1000 ℃ to 980 ℃ for 2 hours, and keeping the temperature at 980 ℃ for 4 hours.
In example 1, the maintenance time of the working layer in the slag line area of the straightening barrel in the torpedo tank is 28 hours, 6.1 tons of refractory materials are consumed, compared with the comparative example, the maintenance time is shortened by about 42 percent, and the consumption of the refractory materials is reduced by 38 percent. Meanwhile, the maintenance mainly takes bulk material pouring construction as a main part, the processes of residual brick removal, brick replacement and masonry are avoided, the labor intensity of workers is reduced, and the service life of the torpedo tank is 1401 times.
Example 2
The maintenance method of the working layer of the straight barrel slag line area of the torpedo ladle comprises the following steps:
1) maintenance time: the torpedo ladle is maintained and overhauled when the service life of the torpedo ladle is 660 times, and the thickness of residual bricks of a working layer in a straight slag line area is ensured to be 130 mm;
2) cleaning residues: cleaning residual iron on a working layer of a straight barrel slag line area;
3) casting a working layer: adding water into the steel fiber mullite castable, and uniformly stirring to obtain a casting solution, wherein the weight ratio of the steel fiber mullite castable to the water in the casting solution is 100: 5.5;
wherein, Al in the steel fiber mullite castable2O3The weight percentage content of (A) is 69%; the bulk density after the treatment at 110 ℃ for 24h is 2.8g/cm3, the normal-temperature compressive strength is 45.5Mpa, the bulk density after the treatment at 1400 ℃ for 3h is 2.58g/cm3, the apparent porosity is 14.5%, and the normal-temperature compressive strength is 50.5 Mpa;
pouring the casting liquid on the working layer on the left side of the straight barrel slag line area of the torpedo ladle, wherein the pouring thickness is 85mm, vibrating the working layer for 2min by using a vibrating rod, naturally airing the working layer for 24h, pouring the casting liquid on the working layer on the right side of the straight barrel slag line area of the torpedo ladle, wherein the pouring thickness is 85mm, vibrating the working layer for 2min by using the vibrating rod, and naturally airing the working layer for 24 h;
4) stage baking and heat preservation:
baking in the first stage: uniformly heating the mixture from room temperature to 390 ℃, wherein the heating time is 14 hours, and the heat preservation time is 6 hours at the temperature of 390 ℃;
baking in the second stage: uniformly heating from 390 ℃ to 1050 ℃, heating for 24 hours, and keeping the temperature at 1050 ℃ for 2 hours;
baking in the third stage: uniformly cooling from 1050 ℃ to 980 ℃, wherein the cooling time is 2 hours, and the heat preservation time is 4 hours at the temperature of 980 ℃.
In example 2, the maintenance time of the working layer in the slag line area of the straightening barrel in the torpedo tank is 23 hours, 4.5 tons of refractory materials are consumed, compared with the comparative example, the maintenance time is shortened by about 53 percent, and the consumption of the refractory materials is reduced by 44 percent. Meanwhile, the maintenance mainly takes bulk material pouring construction as a main part, the residual brick dismantling, brick changing and building processes are avoided, the labor intensity of workers is reduced, and the service life of the torpedo tank is 1411 times.
Example 3
The maintenance method of the working layer of the straight barrel slag line area of the torpedo ladle comprises the following steps:
1) maintenance time: the torpedo ladle is maintained and overhauled when the service life of the torpedo ladle is 670 times, and the thickness of residual bricks of a working layer in a straight barrel slag line area is ensured to be 125 mm;
2) cleaning residues: cleaning residual iron on a working layer of a straight barrel slag line area;
3) casting a working layer: adding water into the steel fiber mullite castable, and uniformly stirring to obtain a casting solution, wherein the weight ratio of the steel fiber mullite castable to the water in the casting solution is 100: 6;
wherein, Al in the steel fiber mullite castable2O3The weight percentage content of (A) is 69%; the bulk density after the treatment at 110 ℃ for 24 hours is 2.7g/cm3The normal temperature compressive strength is 45.8Mpa, and the volume density is 2.61g/cm after 1400 ℃ multiplied by 3h treatment3The apparent porosity is 14 percent, and the normal-temperature compressive strength is 51.2 Mpa;
pouring the casting liquid on the working layer on the left side of the slag line area of the straight cylinder of the torpedo ladle, wherein the pouring thickness is 90mm, vibrating the working layer for 2.5min by using a vibrating rod, naturally airing the working layer for 23h, pouring the casting liquid on the working layer on the right side of the slag line area of the straight cylinder of the torpedo ladle, wherein the pouring thickness is 90mm, vibrating the working layer for 2.5min by using the vibrating rod, and naturally airing the working layer for 23 h;
4) stage baking and heat preservation:
baking in the first stage: uniformly heating the mixture from room temperature to 400 ℃, wherein the heating time is 15 hours, and the heat preservation time is 6.5 hours at the temperature of 400 ℃;
baking in the second stage: uniformly heating from 400 ℃ to 1100 ℃, heating for 25 hours, and keeping the temperature at 1100 ℃ for 2.5 hours;
baking in the third stage: uniformly cooling from 1100 deg.C to 990 deg.C for 2.2 hr, and holding at 990 deg.C for 4 hr.
Example 3 the maintenance time of the working layer of the straightening barrel slag line area in the torpedo tank is 25 hours, and 5 tons of refractory materials are consumed, compared with the comparative example, the maintenance time is shortened by about 48 percent, and the refractory material consumption is reduced by 37 percent. Meanwhile, the maintenance mainly takes bulk material pouring construction as a main part, the residual brick dismantling, brick changing and building processes are avoided, the labor intensity of workers is reduced, and the service life of the torpedo tank is 1418 times.
Example 4
The maintenance method of the working layer of the straight barrel slag line area of the torpedo ladle comprises the following steps:
1) maintenance time: overhauling and maintaining the torpedo ladle at 675 times of service life to ensure that the thickness of the residual bricks of the working layer in the straight slag line area is 122 mm;
2) cleaning residues: cleaning residual iron on a working layer of a straight barrel slag line area;
3) casting a working layer: adding water into the steel fiber mullite castable, and uniformly stirring to obtain a casting solution, wherein the weight ratio of the steel fiber mullite castable to the water in the casting solution is 100: 5.8;
wherein, Al in the steel fiber mullite castable2O3The weight percentage content of (A) is 71.2%; the bulk density after the treatment at 110 ℃ for 24 hours is 2.75g/cm3The normal temperature compressive strength is 46.2Mpa, and the volume density is 2.65g/cm after 1400 ℃ multiplied by 3h treatment3Apparent porosity of 14.2%, normal timeThe temperature and pressure strength is 51.8 Mpa;
pouring the casting liquid on the working layer on the left side of the slag line area of the straight cylinder of the torpedo ladle, wherein the pouring thickness is 95mm, vibrating the working layer for 2.5min by using a vibrating rod, and naturally airing the working layer for 24.5h, pouring the casting liquid on the working layer on the right side of the slag line area of the straight cylinder of the torpedo ladle, wherein the pouring thickness is 95mm, vibrating the working layer for 2.5min by using the vibrating rod, and naturally airing the working layer for 24.5 h;
4) stage baking and heat preservation:
baking in the first stage: uniformly heating the mixture from room temperature to 410 ℃, wherein the heating time is 15.5 hours, and the heat preservation time is 6.5 hours at the temperature of 410 ℃;
baking in the second stage: uniformly heating from 410 ℃ to 1120 ℃, wherein the heating time is 24.5 hours, and the heat preservation time is 2.5 hours at the temperature of 1120 ℃;
baking in the third stage: uniformly cooling from 1120 ℃ to 985 ℃, wherein the cooling time is 2 hours, and the heat preservation time is 4.5 hours at the temperature of 985 ℃.
Example 4 repair in torpedo tank through slag line district working layer maintenance time is 26 hours, consumes 5.3 tons of resistant material, compares with the maintenance of former intermediate repair, has shortened maintenance time about 46%, and resistant material consumption reduces 34%. Meanwhile, the maintenance mainly takes bulk material pouring construction as a main part, the residual brick dismantling and brick changing and building processes are avoided, the labor intensity of workers is reduced, and the service life of the torpedo tank is 1419 times.
Example 5
The maintenance method of the working layer of the straight barrel slag line area of the torpedo ladle comprises the following steps:
1) maintenance time: the torpedo tank is maintained when the service life is 700 times, and the thickness of the residual bricks of the working layer in the straight slag line area is ensured to be 120 mm;
2) cleaning residues: cleaning residual iron on a working layer of a straight barrel slag line area;
3) casting a working layer: adding water into the steel fiber mullite castable, and uniformly stirring to obtain a casting solution, wherein the weight ratio of the steel fiber mullite castable to the water in the casting solution is 100: 5.3;
wherein, Al in the steel fiber mullite castable2O3The weight percentage content of (A) is 71.8%; 110 deg.CThe volume density after multiplied by 24h treatment is 2.77g/cm3The normal temperature compressive strength is 45.9Mpa, the volume density is 2.75g/cm after 1400 ℃ multiplied by 3h treatment3The apparent porosity is 14.3 percent, and the normal-temperature compressive strength is 50.9 Mpa;
pouring the casting liquid on the working layer on the left side of the straight barrel slag line area of the torpedo ladle, wherein the pouring thickness is 100mm, vibrating the working layer for 3min by using a vibrating rod, naturally airing the working layer for 30h, pouring the casting liquid on the working layer on the right side of the straight barrel slag line area of the torpedo ladle, wherein the pouring thickness is 100mm, vibrating the working layer for 3min by using the vibrating rod, and naturally airing the working layer for 30 h;
4) stage baking and heat preservation:
baking in the first stage: uniformly heating the mixture from room temperature to 420 ℃, wherein the heating time is 16 hours, and the heat preservation time is 7 hours at the temperature of 420 ℃;
baking in the second stage: uniformly heating the mixture from 420 ℃ to 1150 ℃, wherein the heating time is 25 hours, and the heat preservation time is 2.2 hours at the temperature of 1150 ℃;
baking in the third stage: the temperature is uniformly reduced from 1150 ℃ to 1000 ℃, the temperature reduction time is 2.5 hours, and the heat preservation time is 4.2 hours at the temperature of 1000 ℃.
Example 5 the maintenance time of the working layer of the through slag line area in the torpedo ladle repair is 27 hours, 6.2 tons of refractory materials are consumed, compared with the previous middle repair maintenance, the maintenance time is shortened by about 44%, and the refractory material consumption is reduced by 32%. Simultaneously, this maintenance mainly uses bulk cargo pouring construction as the owner, has avoided incomplete brick to demolish, has traded the brick and has built the process by laying bricks or stones, has reduced workman's intensity of labour, and torpedo jar life is 1403 times.
The above-mentioned embodiments only express five embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (3)
1. A maintenance method of a working layer of a straight barrel slag line area of a torpedo ladle is characterized by comprising the following steps: the method comprises the following steps:
1) maintenance time: the torpedo tank is overhauled and maintained 660-675 times in service life, and the thickness of residual bricks on a working layer in a straight barrel slag line area is ensured to be 122-130 mm;
2) cleaning residues: cleaning residual iron on a working layer of a straight barrel slag line area;
3) casting a working layer: adding water into a steel fiber mullite castable and uniformly stirring to obtain a casting solution, respectively casting the casting solution on working layers on two sides of a straight slag line area of a torpedo ladle, naturally drying, firstly casting the casting solution on the working layer on the left side of the straight slag line area of the torpedo ladle, vibrating for 2-3 min by using a vibrating rod, naturally drying for 20-30 h, then casting the casting solution on the working layer on the right side of the straight slag line area of the torpedo ladle, wherein the casting thickness is 80-100 mm, vibrating for 2-3 min by using a vibrating rod, and naturally drying for 20-30 h;
4) stage baking and heat preservation:
baking in the first stage: uniformly heating the mixture from room temperature to 390-410 ℃, wherein the heating time is 14-15.5 hours, and the heat preservation time is 6-6.5 hours at 390-410 ℃;
baking in the second stage: uniformly heating to 1050-1120 ℃ from 390-410 ℃, heating for 24-25 hours, and keeping the temperature for 2-2.5 hours at 1050-1120 ℃;
baking in the third stage: uniformly cooling from 1050-1120 ℃ to 980-990 ℃, wherein the cooling time is 2-2.2 hours, and the heat preservation time is 4-4.5 hours at 980-990 ℃.
2. The method for maintaining the working layer of the torpedo ladle straight barrel slag line area according to claim 1, characterized in that: al in the steel fiber mullite castable2O3The weight percentage content of the compound is more than or equal to 68 percent; the volume density of the product treated at 110 ℃ for 24 hours is more than or equal to 2.6g/cm3The normal temperature compressive strength is more than or equal to 45Mpa, and the volume density is more than or equal to 2.55g/cm after 1400 ℃ multiplied by 3h treatment3The apparent porosity is less than or equal to 15 percent, and the normal-temperature compressive strength is more than or equal to 50 Mpa.
3. The method for maintaining the working layer of the torpedo ladle straight barrel slag line area according to claim 1, characterized in that: the weight ratio of the steel fiber mullite castable to water in the casting liquid is 100: 5-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711181676.5A CN108115123B (en) | 2017-11-23 | 2017-11-23 | Maintenance method for working layer of straight barrel slag line area of torpedo ladle |
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| CN110487076B (en) * | 2019-09-05 | 2021-02-19 | 首钢集团有限公司 | Torpedo tank lining repairing method |
| CN112974785B (en) * | 2021-02-08 | 2023-02-10 | 北京首钢股份有限公司 | Steel ladle and steel ladle building method |
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