CN114669733B - Method for repairing long-service-life hot-metal ladle nozzle - Google Patents
Method for repairing long-service-life hot-metal ladle nozzle Download PDFInfo
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- CN114669733B CN114669733B CN202210359836.5A CN202210359836A CN114669733B CN 114669733 B CN114669733 B CN 114669733B CN 202210359836 A CN202210359836 A CN 202210359836A CN 114669733 B CN114669733 B CN 114669733B
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- 239000002184 metal Substances 0.000 title claims abstract description 53
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 53
- 238000005266 casting Methods 0.000 claims abstract description 29
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052863 mullite Inorganic materials 0.000 claims abstract description 26
- 239000000835 fiber Substances 0.000 claims abstract description 19
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 229910001570 bauxite Inorganic materials 0.000 claims abstract description 14
- 229910052849 andalusite Inorganic materials 0.000 claims abstract description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 11
- 239000010703 silicon Substances 0.000 claims abstract description 11
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 6
- 238000001035 drying Methods 0.000 claims abstract description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 239000002245 particle Substances 0.000 claims description 10
- 230000002787 reinforcement Effects 0.000 claims description 9
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 18
- 230000035939 shock Effects 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 10
- 229910052742 iron Inorganic materials 0.000 abstract description 9
- 238000012423 maintenance Methods 0.000 abstract description 7
- 230000007306 turnover Effects 0.000 abstract description 7
- 239000011159 matrix material Substances 0.000 description 15
- 229910052593 corundum Inorganic materials 0.000 description 7
- 239000010431 corundum Substances 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 239000011449 brick Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 239000012071 phase Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- 230000009172 bursting Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 239000005350 fused silica glass Substances 0.000 description 2
- 239000007791 liquid phase Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
Classifications
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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
-
- 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
- B22D41/04—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like tiltable
- B22D41/05—Tea-pot spout ladles
-
- 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
- C04B35/10—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 aluminium oxide
-
- 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
-
- 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
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
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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
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3418—Silicon oxide, silicic acids, or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
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- 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
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3463—Alumino-silicates other than clay, e.g. mullite
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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
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- C04B2235/526—Fibers characterised by the length of the fibers
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- 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
- C04B2235/5264—Fibers characterised by the diameter of the fibers
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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
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5427—Particle size related information expressed by the size of the particles or aggregates thereof millimeter or submillimeter sized, i.e. larger than 0,1 mm
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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
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
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- Mechanical Engineering (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The invention discloses a method for repairing a long-service-life hot-metal ladle nozzle, and belongs to the technical field of hot-metal ladle nozzles. The invention comprises the following steps: the ladle nozzle 110 of the hot-metal ladle 100 is cast by using casting materials, and a steel core reinforcing member is arranged in the casting materials, wherein the casting materials are prepared from the following materials in parts by weight: bauxite: 30-40 parts of mullite: 30-50 parts of silicon micropowder: 5-10 parts of andalusite: 10-20 parts of explosion-proof fiber: 2-4 parts; naturally drying for 24-30 h, and baking; and after baking for 12-24 hours with small fire, baking for 12 hours with medium fire and then baking for 6 hours with large fire. In order to solve the problems in the prior art, the invention aims to provide the method for repairing the ladle nozzle of the hot-metal ladle with long service life, which can obviously improve the thermal shock resistance of the burner, has no iron seepage in the use process, greatly reduces the maintenance times of the ladle nozzle of the hot-metal ladle and the labor intensity of workers, and effectively improves the turnover rate and the safety and reliability of the hot-metal ladle.
Description
Technical Field
The invention relates to the technical field of ladle nozzles of hot-metal ladles, in particular to a method for repairing a ladle nozzle of a long-service-life hot-metal ladle.
Background
The hot metal ladle is arranged on the hot metal ladle car and is suitable for a container for carrying and transporting molten iron between the blast furnace and the converter. Wherein, the ladle nozzle of the ladle is used as an important component of the ladle to determine the quality of the use performance. Traditional hot-metal bottle mouth adopts the firebrick to build, and the gluey sediment of jar mouth is serious in the use to KR desulfurization technology slagging-off process is easy with the firebrick not hard up, and molten iron is easy to erode in the clearance department of firebrick, causes the whole damage of hot-metal bottle mouth, and convection current mouth brick and slag line brick injury are great. The improvement of turnover rate is not facilitated, and the increase of maintenance cost and the running safety risk are caused. Basically, the tank mouth is required to be cleaned by taking off the line to run about 20 tanks.
Aiming at the situation that the refractory bricks are loosened in the process of gap erosion and slag skimming among refractory bricks of a tank nozzle, scientific researchers and enterprises adopt an integral hot-metal ladle tank nozzle casting material method, firstly, alumina castable is used, the service life of the tank nozzle is obviously improved, the service life of the tank nozzle cast by corundum castable is about 150-200 times along with further optimization of materials, but the tank nozzle still has defects, and the safety and the stability of production are seriously affected by the integral falling of the refractory castable due to poor thermal shock resistance of the corundum refractory castable.
Through searching, the technology related to the molten iron desulfurization method is disclosed in patent literature, for example, chinese patent publication No.: CN101020610A discloses a casting material for a hot-metal ladle, a casting process and a special die, and a casting material prepared from superfine bauxite clinker, sub-white corundum and Al 2 O 3 The casting material is formed by casting the bottom of the hot metal ladle. The method improves the high-temperature performance of the castable of the hot metal ladle to a certain extent. However, the casting material still has the defect that the service time of the hot metal ladle is greatly shortened due to poor thermal shock stability of the casting material.
In another example, document Al 2 O 3 The integral pouring technique of the SiC-C hot metal ladle is Zhang Yu, wei Jigang, and the saddle steel technique is introduced on page 1, 38-40 of 2004, and a permanent layer of the hot metal ladle is built by adopting a light high-alumina brick and the hot metal ladle is poured. The method improves the service life of the hot-metal ladle to a certain extent. But still has the following disadvantages: al (Al) 2 O 3 The SiC-C castable is costly and after prolonged use, and the raw material fused brown corundum can cause serious pollution during production. .
Disclosure of Invention
1. Technical problem to be solved by the invention
In order to solve the problems in the prior art, the invention aims to provide the method for repairing the ladle nozzle of the hot-metal ladle with long service life, which can obviously improve the thermal shock resistance of the burner, has no iron seepage in the use process, greatly reduces the maintenance times of the ladle nozzle of the hot-metal ladle and the labor intensity of workers, and effectively improves the turnover rate and the safety and reliability of the hot-metal ladle.
2. Technical proposal
In order to achieve the above purpose, the technical scheme provided by the invention is as follows:
the invention discloses a method for repairing a long-service-life hot-metal ladle nozzle, which comprises the following steps of:
(1) The ladle nozzle 110 of the hot-metal ladle 100 is cast by using casting materials, and a steel core reinforcing member is arranged in the casting materials, wherein the casting materials are prepared from the following materials in parts by weight: bauxite: 30-40 parts of mullite: 30-50 parts of silicon micropowder: 5-10 parts of andalusite: 10-20 parts of explosion-proof fiber: 2-4 parts;
(2) Naturally drying for 24-30 h;
(3) Baking: and after baking for 12-24 hours with small fire, baking for 12 hours with medium fire and then baking for 6 hours with large fire.
Preferably, the granularity of the castable material consists of 5 particle sizes of 5 mm-8 mm, 5 mm-3 mm, 3 mm-1 mm, 1 mm-0.074 mm and less than 0.074mm, and the weight parts corresponding to the particle sizes of 5 mm-8 mm, 5 mm-3 mm, 3 mm-1 mm, 1-0.074 mm and less than 0.074mm are 20-27 parts, 15-20 parts, 20-23 parts, 15-20 parts and 10-17 parts in sequence.
Preferably, the grain sizes of mullite and bauxite are composed of four kinds of grain sizes of 5 mm-8 mm, 5 mm-3 mm, 3 mm-1 mm and 1 mm-0.074 mm, the grain size of andalusite is composed of two kinds of grain sizes of 1 mm-0.074 mm and less than 0.074mm, and the grain size of silica micropowder is less than 0.074mm.
Preferably, the length of the explosion-proof fiber is 2 mm-8 mm, and the diameter is 0.01 mm-0.03 mm.
Preferably, in the step (3), the temperature is raised to 130 ℃ from room temperature for 12-24 hours, then the temperature is raised to 320 ℃ from 130 ℃ for 12 hours, and then the temperature is raised to 800 ℃ from 320 ℃ for 6 hours.
Preferably, the steel core reinforcement is a screw reinforcement.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
(1) According to the method for repairing the long-service-life hot-metal ladle nozzle, the mullite castable is adopted, compared with corundum castable and bauxite castable, the thermal shock resistance is remarkably improved, the phenomenon of iron infiltration is effectively inhibited due to no extremely difficult cracking and the like in a long-time service process, the service time of the hot-metal ladle nozzle is remarkably improved, the maintenance times of the hot-metal ladle nozzle and the labor intensity of workers are greatly reduced, and the turnover rate and the safety reliability of the hot-metal ladle are effectively improved. In addition, the mullite raw material has simple manufacturing process and low cost, and does not produce environmental pollution in the preparation process.
(2) According to the method for repairing the long-service-life hot-metal ladle nozzle, mullite and bauxite are used as aggregate and matrix materials to be applied to casting materials, and the main function of the method is to build a structure and the basic strength of the material as the aggregate. The silicon micropowder can effectively fill micro-pores in the matrix so as to further improve the density of the matrix, and in addition, under the high-temperature condition, the silicon micropowder can react with alumina in the matrix to produce mullite so as to further improve the strength and thermal shock stability of the material. The mullite and quartz phases are decomposed and generated under the high-temperature condition of andalusite, so that the porosity of the matrix is reduced, and meanwhile, the strength of the castable is improved. The explosion-proof fiber is uniformly mixed with other refractory materials, baked after forming, and the fiber begins to soften, shrink and melt when the baking temperature is continuously increased and reaches a certain temperature, and finally air holes are formed and carbonized, and the air holes are distributed in a construction body to form micro-network air holes, so that the explosion-proof fiber can open a water-gas channel, lighten internal stress, prevent bursting and prolong the whole service life.
(3) The invention relates to a method for repairing a long-service-life hot-metal ladle nozzle, which mainly comprises the steps of reinforcing a casting material matrix and improving the normal-temperature and high-temperature mechanical strength of the material. The load on the mouth of the hot-metal ladle is dispersed to the stressed twisted steel, so that the mechanical strength of the material is improved, and cracks caused by shrinkage, temperature change and other reasons of the casting material can be prevented.
(4) According to the method for repairing the long-service-life hot-metal ladle nozzle, the hot-metal ladle nozzle is firstly baked for 12-24 hours from room temperature to 130 ℃, then baked for 12 hours from 130 ℃ to 320 ℃, and then baked for 6 hours from 320 ℃ to 800 ℃. The sectional baking process is adopted to effectively inhibit the generation and the expansion of cracks on the substrate, the baking system has obvious influence on the usability of materials, the thermal shock resistance of the burner can be obviously improved, no iron seepage occurs in the use process, the maintenance times of the ladle nozzle of the hot metal ladle and the labor intensity of workers are greatly reduced, and the turnover rate and the safety and reliability of the hot metal ladle are effectively improved.
Drawings
FIG. 1 is a schematic diagram of the structure of a long-life hot-metal ladle nozzle of the present invention.
In the figure:
100. a hot-metal ladle; 110. a can mouth; 111. casting materials; 112. steel core reinforcement.
Detailed Description
For a further understanding of the present invention, the present invention will be described in detail with reference to the drawings.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The invention is further described below with reference to examples.
Example 1
The method for repairing the long-service-life hot-metal ladle nozzle comprises the following steps of:
(1) The pouring material 111 is used for pouring and forming the ladle nozzle 110 of the hot metal ladle 100, and a steel core reinforcing member 112 is arranged in the pouring material, wherein the pouring material 111 comprises the following materials in parts by weight: bauxite: 30-40 parts of mullite: 30-50 parts of silicon micropowder: 5-10 parts of andalusite: 10-20 parts of explosion-proof fiber: 2 to 4 parts, specifically, bauxite in this example: 30 parts of mullite: 35 parts of silicon micropowder: 10 parts of andalusite: 20 parts of explosion-proof fiber: 2 parts of the above raw materials are weighed according to important parts, uniformly mixed, then added with 1-3 parts of water by mass, uniformly stirred and then subjected to casting molding, and the water-cooling heat shock times of the prepared castable 111 are increased to 30 times.
According to the method for repairing the ladle nozzle, compared with corundum and alumina castable 111, the mullite castable 111 is adopted, so that the thermal shock resistance is remarkably improved, cracking and other phenomena are not extremely difficult to generate in a long-time service process, the iron seepage phenomenon is effectively inhibited, the service time of the ladle nozzle is remarkably improved, the maintenance times of the ladle nozzle and the labor intensity of workers are greatly reduced, and the turnover rate and the safety and reliability of the ladle are effectively improved. In addition, the mullite raw material has simple manufacturing process and low cost, and does not produce environmental pollution in the preparation process. Mullite and bauxite are applied as aggregate and matrix materials in castable 111, which serve mainly as basic strength of the aggregate building structure and material. The silicon micropowder can effectively fill micro-pores in the matrix so as to further improve the density of the matrix, and in addition, under the high-temperature condition, the silicon micropowder can react with alumina in the matrix to produce mullite so as to further improve the strength and thermal shock stability of the material. The mullite and quartz phases are decomposed and generated under the high-temperature condition of andalusite, so that the porosity of the matrix is reduced, and meanwhile, the strength of the castable is improved. The explosion-proof fiber is uniformly mixed with other refractory materials, baked after forming, and the fiber begins to soften, shrink and melt when the baking temperature is continuously increased and reaches a certain temperature, and finally air holes are formed and carbonized, and the air holes are distributed in a construction body to form micro-network air holes, so that the explosion-proof fiber can open a water-gas channel, lighten internal stress, prevent bursting and prolong the whole service life.
At present, most of the ladle nozzle of the ladle is made of corundum materials, but mullite materials exist. The repairing method of the ladle nozzle of the ladle in the embodiment improves the mechanical strength and the thermal shock stability of the material on the basis of the mullite castable 111, thereby improving the service performance of the material. The proportion adopted in the embodiment is that the production of mullite and molten liquid phase in a matrix is optimized under the high-temperature condition, so that the normal-temperature and high-temperature mechanical strength of the material is improved, the porosity of the pattern is reduced, and the erosion resistance of the material is further improved. The silica powder in the castable 111 of the embodiment firstly improves the fluidity of the slurry in the casting process by self action, and secondly generates molten liquid phase under high temperature condition to fill pores in the matrix; mullite and fused quartz phases are generated by decomposing andalusite at high temperature, and the fused quartz phases can also fill the pores in the matrix by self-flowing action, so that the mechanical strength and thermal shock stability of the material at normal temperature and high temperature are improved by the generation of mullite.
In this embodiment, the steel core reinforcement 112 is a twisted steel, and a plurality of steel core reinforcements 112 are uniformly distributed along the height direction of the hot metal ladle 100. The steel core reinforcement 112 mainly performs reinforcement in the matrix of the castable 111 material and improves the normal and high temperature mechanical strength of the material. The load applied to the nozzle 110 of the hot metal ladle 100 is dispersed to the stressed twisted steel, so that the mechanical strength of the material is improved, and cracks caused by shrinkage of the casting material 111, temperature change, and the like can be prevented. The action mechanism mainly comprises:
(1) chemisorption forces, also known as cementing forces, are applied to the interface of the rebar and castable 111.
(2) The casting material 111 contracts to tightly grip the screw reinforcement and generate friction.
(3) The mechanical engagement effect, also called engagement force, between the surface roughness of the twisted steel and the casting material is generated.
According to the invention, the steel core reinforcing member 112 is built in the mullite castable 111, so that the overall strength and fracture toughness of the castable 111 can be remarkably improved, and meanwhile, as the expansion coefficient of the twisted steel is larger than the residual stress generated by the expansion coefficient of the castable 111, the diffusion of cracks in the castable 111 can be effectively inhibited, and the overall strength and toughness of the castable 111 material can be further improved.
The particle size of the castable 111 material in this embodiment is composed of 5 particle sizes of 5 mm-8 mm, 5 mm-3 mm, 3 mm-1 mm, 1 mm-0.074 mm and less than 0.074mm, and the weight parts corresponding to the particle sizes of 5 mm-8 mm, 5 mm-3 mm, 3 mm-1 mm, 1-0.074 mm and less than 0.074mm are 20-27 parts, 15-20 parts, 20-23 parts, 15-20 parts and 10-17 parts in sequence. Specifically, the particle diameters of the embodiment are 27 parts, 18 parts, 23 parts, 15 parts and 17 parts by weight corresponding to 5 mm-8 mm, 5 mm-3 mm, 3 mm-1 mm, 1-0.074 mm and less than 0.074mm.
In the embodiment, the grain sizes of mullite and bauxite are composed of four kinds of grain sizes of 5 mm-8 mm, 5 mm-3 mm, 3 mm-1 mm and 1 mm-0.074 mm, the grain size of andalusite is composed of two kinds of grain sizes of 1 mm-0.074 mm and less than 0.074mm, and the grain size of silica micropowder is less than 0.074mm. The length of the explosion-proof fiber is 2 mm-8 mm, and the diameter is 0.01 mm-0.03 mm. Specifically, the length of the explosion-proof fiber in this example was 2mm and the diameter was 0.02mm.
(2) Naturally drying for 24-30 h;
(3) Baking: after baking for 12-24 hours with small fire, then baking for 12 hours with medium fire and then baking for 6 hours with large fire, specifically, in this embodiment, baking is performed for 12-24 hours from room temperature to 130 ℃, then baking is performed for 12 hours from 130 ℃ to 320 ℃, and then baking is performed for 6 hours from 320 ℃ to 800 ℃. The sectional baking process is adopted to effectively inhibit the generation and the expansion of cracks on the substrate, the baking system has obvious influence on the usability of materials, the thermal shock resistance of the burner can be obviously improved, no iron seepage occurs in the use process, the maintenance times of the ladle nozzle of the hot metal ladle and the labor intensity of workers are greatly reduced, and the turnover rate and the safety and reliability of the hot metal ladle are effectively improved.
Example 2
The basic steps of the method for repairing the long-life hot-metal ladle nozzle of the embodiment are as described in embodiment 1, and the difference is that bauxite in the embodiment is as follows: 40 parts of mullite: 30 parts of silicon micropowder: 5 parts of andalusite: 18 parts of explosion-proof fiber: 3 parts of the raw materials are weighed according to important parts, uniformly mixed, then added with 1-3 parts of water by mass, uniformly stirred and cast, and the water-cooling heat shock times of the prepared casting material 111 are increased to 38 times.
In this example, the weight parts corresponding to the particle diameters of 5mm to 8mm, 5mm to 3mm, 3mm to 1mm, 1 to 0.074mm and less than 0.074mm are 25 parts, 20 parts, 21 parts, 16 parts and 13 parts in order.
The length of the explosion-proof fiber in this example was 6mm and the diameter was 0.01mm.
Example 3
The basic steps of the method for repairing the long-life hot-metal ladle nozzle of the embodiment are as described in embodiment 1, and the difference is that bauxite in the embodiment is as follows: 30 parts of mullite: 35 parts of silicon micropowder: 10 parts of andalusite: 20 parts of explosion-proof fiber: 2 parts of the above raw materials are weighed according to important parts, uniformly mixed, then added with 1-3 parts of water by mass, uniformly stirred and then subjected to casting molding, and the water-cooling heat shock times of the prepared castable 111 are increased to 35 times.
In this example, the weight parts corresponding to the particle diameters of 5mm to 8mm, 5mm to 3mm, 3mm to 1mm, 1 to 0.074mm and less than 0.074mm are 20 parts, 15 parts, 20 parts and 10 parts in this order.
The length of the explosion-proof fiber in this example was 8mm and the diameter was 0.03mm.
The invention and its embodiments have been described above by way of illustration and not limitation, and the invention is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present invention.
Claims (3)
1. A method for repairing a long-service-life hot-metal ladle nozzle is characterized by comprising the following steps of: the method comprises the following steps:
(1) Casting forming is carried out on a ladle nozzle (110) of a hot metal ladle (100) by using a casting material (111), and a steel core reinforcing member (112) is arranged in the casting material (111), wherein the casting material (111) comprises the following materials in parts by weight: bauxite: 30-40 parts of mullite: 30-50 parts of silicon micropowder: 5-10 parts of andalusite: 10-20 parts of explosion-proof fiber: 2-4 parts;
(2) Naturally drying for 24-30 h;
(3) Baking: firstly, baking for 12-24 h from room temperature to 130 ℃, then baking for 12h from 130 ℃ to 320 ℃, and then baking for 6h from 320 ℃ to 800 ℃;
the length of the explosion-proof fiber is 2 mm-8 mm, and the diameter is 0.01 mm-0.03 mm;
the built-in steel core reinforcement (112) is a twisted steel.
2. The method for repairing the long-life hot-metal ladle nozzle according to claim 1, wherein the method comprises the following steps: the granularity of the castable (111) material is composed of 5 particle sizes of 5 mm-8 mm, 5 mm-3 mm, 3 mm-1 mm, 1 mm-0.074 mm and less than 0.074mm, and the weight parts corresponding to the particle sizes of 5 mm-8 mm, 5 mm-3 mm, 3 mm-1 mm, 1-0.074 mm and less than 0.074mm are 20-27 parts, 15-20 parts, 20-23 parts, 15-20 parts and 10-17 parts in sequence.
3. The method for repairing the long-life hot-metal ladle nozzle according to claim 2, wherein the method comprises the following steps: the grain size of mullite and bauxite is composed of four grain sizes of 5 mm-8 mm, 5 mm-3 mm, 3 mm-1 mm and 1 mm-0.074 mm, the grain size of andalusite is composed of two grain sizes of 1 mm-0.074 mm and less than 0.074mm, and the grain size of silica micropowder is less than 0.074mm.
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