CN100357693C - Method for repairing furnace lining of intermediate frequency furnace for steelmaking - Google Patents
Method for repairing furnace lining of intermediate frequency furnace for steelmaking Download PDFInfo
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- CN100357693C CN100357693C CNB2005100993424A CN200510099342A CN100357693C CN 100357693 C CN100357693 C CN 100357693C CN B2005100993424 A CNB2005100993424 A CN B2005100993424A CN 200510099342 A CN200510099342 A CN 200510099342A CN 100357693 C CN100357693 C CN 100357693C
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- lining
- intermediate frequency
- furnace lining
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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
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- 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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Abstract
The present invention relates to a method for repairing a furnace lining, particularly to a method for repairing a furnace lining of an intermediate frequency furnace for steelmaking, which comprises the following steps: step a, determining the time for repairing the furnace; step b, clearing the inner side of the furnace; step c, adding the adhesive and furnace building materials; step d, putting in forming steel molds (3) and starting steel blocks; step e, adding furnace building materials; step f, sintering furnace building materials. The repairing method of the present invention has the advantages of relatively easy control of the repairing method, capability of rapidly and effectively repairing the furnace lining, and organic combination of the furnace building materials and the original furnace lining; meanwhile, the integral steel blocks of which the shape and the size are matched with those of the bottoms of the forming steel molds are added to make the furnace bottom flat, and a furnace chamber is uniformly heated in the baking process, so as to have the advantages of good sintering effect, regular shape of the furnace lining after repairing, and long service life; through the practical proof of trial production, the furnace lining can be used for average 50 to 70 times after repaired once, the furnace life can be prolonged form 50 times to more than 150 times on the basis of each furnace lining for repairing two times.
Description
Technical field
The present invention relates to a kind of lining repairing method, especially steel-making intermediate frequency furnace lining repairing method.
Background technology
Steel-making of intermediate frequency furnace technology is simple, required investment is also both economical, quartz sand is widely used brickwork material, Chinese invention patent application " lining sand of electric induction furnace " (publication number: CN 1171539A, 96118045.5) and " acid burner lining refractory material for induction furnace " (publication number: CN1110964A, open day: November 1 nineteen ninety-five open day: on January 28th, 1998, application number:, application number: 94110946.1), all the used quartz sand material of brickwork is compared detailed explanation.
Because the fusing point of quartz sand is about 1700 ℃, near about 1600 ℃ molten steel tapping temperature, in addition medium-frequency induction furnace intensification ability more intense (can reach 10 ℃/min), but also has function composite by electromagnetic stirring, be easy to cause the molten steel of first fusion to be rapidly heated and wash away furnace bottom and furnace wall, cause the loss of quartz sand lining, usually furnace lining attenuation and losing efficacy behind the 40-50 heat, as shown in Figure 1, furnace lining often was and resembled the pin shape this moment, again tamping, sintered lining required time and manually all bigger, so applying unit often selects the furnace lining that lost efficacy is repaired, it is exactly a kind of fettling technology commonly used that siccative is vulcanized, but from result of use, there is certain defective in it, mainly shows: (1), repair efficiency to the furnace wall is not good, and mending material is difficult for combining with former furnace lining; (2), repair the back and add steel material sintering because steel material shape, size are different, contact inhomogeneously with burner hearth, cause the surface of burner hearth sintering bad, the part mending material peels off.
Summary of the invention
The purpose of this invention is to provide a kind of fettling fast and effeciently, thereby reduce the brickwork number of times, prolong furnace life, reduce the steel-making intermediate frequency furnace lining repairing method of steel-making cost.
Technical scheme of the present invention is:
A kind of steel-making comprises the steps: with intermediate frequency furnace lining repairing method
A, determine opportunity of fettling
When current lining thickness is less than or equal to former lining thickness 40%, the beginning fettling;
B, to clearing up in the stove
Pour out whole molten steel in the stove,, and the residue that adheres in the stove is cleaned out if there is remainder then to treat to claw after it solidifies;
C, input binding agent and brickwork material
At first binding agent is evenly shed at furnace bottom, then according to floating after an amount of brickwork material of the loss situation input of furnace bottom part and the tamping, the furnace bottom part is basic to restore to the original state or slightly high thereby make;
D, put into shaping steel die and start bloom
Fettling is put into stove with shaping steel die, in shaping steel die, put into bloom then;
E, input brickwork material
The brickwork material is evenly dropped in the slit between furnace wall and the shaping steel die, and with the tamping of brickwork material, up to the brickwork material and shaping steel die topmost remains basically stable or slightly high;
F, sintering brickwork material
Start intermediate frequency furnace, 900-1000 ℃ of control temperature heated baking 20-30 minute, progressively was warming up to then to make the bloom fusing or be warming up to 1500 ℃ in 60-90 minute and finishes sintering.
Wherein binding agent is that granularity is the boric acid of 1-2mm.
Wherein the THICKNESS CONTROL of binding agent is 2.0-2.5Kg/m at 5-6mm or by weight of binder/hearth area
2Add binding agent.
Wherein the brickwork material is identical with former furnace lining material.
Further, wherein the brickwork material is identical quartz sand with furnace lining.
Wherein shaping steel die is the tubbiness that matches with the furnace wall.
The size of its bloom and shape match with shaping steel die inner chamber and bottom.
Wherein among the step f during sintering brickwork material temperature-rise period be that constant speed is uniform.
Method for repairing and mending ratio of the present invention is easier to grasp, fettling fast and effeciently, and brickwork material and former furnace lining are organically combined, simultaneously the monoblock bloom of shape size with used shaping steel die bottom wedging dropped into, make furnace bottom smooth, burner hearth is heated evenly in bake process, sintering effect is good, furnace lining regular shape after the repairing, life-span is long, proves through practice of trial production, and 1 furnace lining of every repairing on average can use the 50-70 heat, calculate for 2 times with each lining repairing, furnace life can extend to more than 150 heats from 50 heats.
Description of drawings
The furnace lining schematic diagram of accompanying drawing 1 for needing in the background technology of the present invention to repair;
Accompanying drawing 2 is the schematic diagram of fettling among the present invention.
The specific embodiment
The present invention is further detailed explanation below in conjunction with accompanying drawing:
Embodiment 1:
As shown in Figure 1, usually furnace lining attenuation and losing efficacy behind the 40-50 heat, often be and resemble the pin shape, the obvious characteristic of this moment also has: burn-off rate is obviously accelerated, fusing is lower than more than the initial stage 300mm with the steel feed liquid face of weight, the part has obviously recessed deeply, finds after testing in the actual production that current lining thickness is less than or equal to 40% o'clock of former lining thickness, just can begin furnace lining is repaired.
Pouring out in the stove all molten steel, if there is remainder then to treat to claw after it solidifies, and the residue that adheres in the stove is cleaned out, is that the boric acid of 1mm is evenly shed at furnace bottom 2 with granularity, and the boric acid THICKNESS CONTROL is 2.0Kg/m at 5mm or by boric acid weight/furnace bottom 2 areas
2Add boric acid, then according to the loss situation input of furnace bottom 2 parts an amount of with furnace lining on composition and granularity identical quartz sand as the brickwork material, floating after the tamping, thereby make furnace bottom 2 parts reinstatement or slightly high, fettling is put into stove with shaping steel die 3, as shown in Figure 2, shaping steel die 3 is the tubbiness that match with furnace wall 1, in shaping steel die 3, put into bloom 4 then, the size of bloom 4 and shape match with shaping steel die 3 inner chambers and bottom, will and furnace lining identical quartz sand on composition and granularity evenly drop in the slit between furnace wall 1 and the shaping steel die 3 as the brickwork material, when dropping into the brickwork material is carried out ramming so that with its tamping, fair topmost or slightly high up to brickwork material and shaping steel die 3, start intermediate frequency furnace, 900 ℃ of temperature of control, heated baking 30 minutes, constant speed evenly is warming up to make bloom 4 fusings or reach 1500 ℃ and can finishes sintering in 90 minutes then.
Embodiment 2:
Current lining thickness is less than or equal to 40% o'clock of former lining thickness, just can begin furnace lining is repaired.
Pour out whole molten steel in the stove, if there is remainder then to treat to claw after it solidifies, and the residue that adheres in the stove is cleaned out, and is that the boric acid of 1.5mm is evenly shed at furnace bottom 2 with granularity, and the boric acid THICKNESS CONTROL is 2.25Kg/m at 5.5mm or by boric acid weight/furnace bottom 2 areas
2Add boric acid, then according to the loss situation input of furnace bottom 2 parts an amount of with furnace lining on composition and granularity identical quartz sand as the brickwork material, floating after the tamping, thereby make furnace bottom 2 parts reinstatement or slightly high, fettling is put into stove with shaping steel die 3, as shown in Figure 2, shaping steel die 3 is the tubbiness that match with furnace wall 1, in shaping steel die 3, put into bloom 4 then, the size of bloom 4 and shape match with shaping steel die 3 inner chambers and bottom, will and furnace lining identical quartz sand on composition and granularity evenly drop in the slit between furnace wall 1 and the shaping steel die 3 as the brickwork material, when dropping into the brickwork material is carried out ramming so that with its tamping, fair topmost or slightly high up to brickwork material and shaping steel die 3, start intermediate frequency furnace, 950 ℃ of temperature of control, heated baking 25 minutes, constant speed evenly is warming up to make bloom 4 fusings or reach 1500 ℃ and can finishes sintering in 75 minutes then.
Embodiment 3:
Current lining thickness is less than or equal to 40% o'clock of former lining thickness, just can begin furnace lining is repaired.
Pouring out in the stove all molten steel, if there is remainder then to treat to claw after it solidifies, and the residue that adheres in the stove is cleaned out, is that the boric acid of 2mm is evenly shed at furnace bottom 2 with granularity, and the boric acid THICKNESS CONTROL is 2.5Kg/m at 6mm or by boric acid weight/furnace bottom 2 areas
2Add boric acid, then according to the loss situation input of furnace bottom 2 parts an amount of with furnace lining on composition and granularity identical quartz sand as the brickwork material, floating after the tamping, thereby make furnace bottom 2 parts reinstatement or slightly high, fettling is put into stove with shaping steel die 3, as shown in Figure 2, shaping steel die 3 is the tubbiness that match with furnace wall 1, in shaping steel die 3, put into bloom 4 then, the size of bloom 4 and shape match with shaping steel die 3 inner chambers and bottom, will and furnace lining identical quartz sand on composition and granularity evenly drop in the slit between furnace wall 1 and the shaping steel die 3 as the brickwork material, when dropping into the brickwork material is carried out ramming so that with its tamping, fair topmost or slightly high up to brickwork material and shaping steel die 3, start intermediate frequency furnace, 1000 ℃ of temperature of control, heated baking 20 minutes, constant speed evenly is warming up to make bloom 4 fusings or reach 1500 ℃ and can finishes sintering in 60 minutes then.
Embodiment 4:
Current lining thickness is less than or equal to 40% o'clock of former lining thickness, just can begin furnace lining is repaired.
Pour out whole molten steel in the stove, if there is remainder then to treat to claw after it solidifies, and the residue that adheres in the stove is cleaned out, with granularity is that the boric acid of 1mm is evenly shed at furnace bottom 2, the boric acid THICKNESS CONTROL is at 5mm, then according to the loss situation input of furnace bottom 2 parts an amount of with furnace lining on composition and granularity identical quartz sand as the brickwork material, floating after the tamping, thereby furnace bottom 2 parts are restored to the original state, fettling is put into stove with shaping steel die 3, as shown in Figure 2, shaping steel die 3 is the tubbiness that match with furnace wall 1, in shaping steel die 3, put into bloom 4 then, the size of bloom 4 and shape match with shaping steel die 3 inner chambers and bottom, will and furnace lining identical quartz sand on composition and granularity evenly drop in the slit between furnace wall 1 and the shaping steel die 3 as the brickwork material, when dropping into the brickwork material is carried out ramming so that with its tamping, topmost maintain an equal level up to brickwork material and shaping steel die 3, start intermediate frequency furnace, 900 ℃ of control temperature, heated baking 30 minutes, constant speed evenly is warming up to and makes bloom 4 fusing can finish sintering in 90 minutes then.
Embodiment 5:
Current lining thickness is less than or equal to 40% o'clock of former lining thickness, just can begin furnace lining is repaired.
Pouring out in the stove all molten steel, if there is remainder then to treat to claw after it solidifies, and the residue that adheres in the stove is cleaned out, is that the boric acid of 1.5mm is evenly shed at furnace bottom 2 with granularity, is 2.4Kg/m by boric acid weight/furnace bottom 2 areas
2Add boric acid, then according to the loss situation input of furnace bottom 2 parts an amount of with furnace lining on composition and granularity identical quartz sand as the brickwork material, floating after the tamping, thereby make furnace bottom 2 parts reinstatement and slightly high, fettling is put into stove with shaping steel die 3, as shown in Figure 2, shaping steel die 3 is the tubbiness that match with furnace wall 1, in shaping steel die 3, put into bloom 4 then, the size of bloom 4 and shape match with shaping steel die 3 inner chambers and bottom, will and furnace lining identical quartz sand on composition and granularity evenly drop in the slit between furnace wall 1 and the shaping steel die 3 as the brickwork material, when dropping into the brickwork material is carried out ramming so that with its tamping, topmost maintain an equal level up to brickwork material and shaping steel die 3, start intermediate frequency furnace, 950 ℃ of temperature of control, heated baking 25 minutes, constant speed evenly is warming up to and reaches 1500 ℃ and can finish sintering in 75 minutes then.
Embodiment 6:
Current lining thickness is less than or equal to 40% o'clock of former lining thickness, just can begin furnace lining is repaired.
Pour out whole molten steel in the stove, if there is remainder then to treat to claw after it solidifies, and the residue that adheres in the stove is cleaned out, with granularity is that the boric acid of 2mm is evenly shed at furnace bottom 2, the boric acid THICKNESS CONTROL is at 6mm, then according to the loss situation input of furnace bottom 2 parts an amount of with furnace lining on composition and granularity identical quartz sand as the brickwork material, floating after the tamping, thereby make furnace bottom 2 parts reinstatement and slightly high, fettling is put into stove with shaping steel die 3, as shown in Figure 2, shaping steel die 3 is the tubbiness that match with furnace wall 1, in shaping steel die 3, put into bloom 4 then, the size of bloom 4 and shape match with shaping steel die 3 inner chambers and bottom, will and furnace lining identical quartz sand on composition and granularity evenly drop in the slit between furnace wall 1 and the shaping steel die 3 as the brickwork material, when dropping into the brickwork material is carried out ramming so that with its tamping, fair topmost and slightly high up to brickwork material and shaping steel die 3, start intermediate frequency furnace, 980 ℃ of control temperature, heated baking 22 minutes, constant speed evenly is warming up to and reaches 1500 ℃ and can finish sintering in 85 minutes then.
Claims (8)
1, a kind of steel-making comprises the steps: with intermediate frequency furnace lining repairing method
A, determine opportunity of fettling
When current lining thickness is less than or equal to former lining thickness 40%, the beginning fettling;
B, to clearing up in the stove
Pour out whole molten steel in the stove,, and the residue that adheres in the stove is cleaned out if there is remainder then to treat to claw after it solidifies;
C, input binding agent and brickwork material
At first binding agent is evenly shed in furnace bottom (2), drop into after brickwork material and the tamping according to the loss situation of furnace bottom (2) part then floating, thereby furnace bottom (2) part is restored to the original state;
D, put into shaping steel die (3) and start bloom
Fettling is put into stove with shaping steel die (3), in shaping steel die (3), put into bloom (4) then;
E, input brickwork material
The brickwork material is evenly dropped in the slit between furnace wall (1) and the shaping steel die (3), and, topmost maintain an equal level up to brickwork material and shaping steel die (3) with the tamping of brickwork material;
F, sintering brickwork material
Start intermediate frequency furnace, 900-1000 ℃ of control temperature heated baking 20-30 minute, progressively was warming up to then bloom (4) to be melted or be warming up to 1500 ℃ in 60-90 minute and finishes sintering.
2, steel-making as claimed in claim 1 intermediate frequency furnace lining repairing method, it is characterized in that: wherein binding agent is that granularity is the boric acid of 1-2mm.
3, steel-making as claimed in claim 1 intermediate frequency furnace lining repairing method, it is characterized in that: wherein the THICKNESS CONTROL of binding agent is 2.0-2.5Kg/m at 5-6mm or by weight of binder/furnace bottom (2) area
2Add binding agent.
4, steel-making as claimed in claim 1 intermediate frequency furnace lining repairing method, it is characterized in that: wherein the brickwork material is identical with former furnace lining material.
5, steel-making as claimed in claim 4 intermediate frequency furnace lining repairing method, it is characterized in that: wherein the brickwork material is identical quartz sand with furnace lining.
6, steel-making as claimed in claim 1 intermediate frequency furnace lining repairing method, it is characterized in that: wherein shaping steel die (3) is the tubbiness that matches with furnace wall (1).
7, steel-making as claimed in claim 1 intermediate frequency furnace lining repairing method, it is characterized in that: size of its bloom (4) and shape match with shaping steel die (3) inner chamber and bottom.
8, steel-making as claimed in claim 1 is characterized in that with intermediate frequency furnace lining repairing method: wherein among the step f during sintering brickwork material temperature-rise period be that constant speed is uniform.
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| CNB2005100993424A CN100357693C (en) | 2005-09-14 | 2005-09-14 | Method for repairing furnace lining of intermediate frequency furnace for steelmaking |
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| CNB2005100993424A CN100357693C (en) | 2005-09-14 | 2005-09-14 | Method for repairing furnace lining of intermediate frequency furnace for steelmaking |
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| CN100357693C true CN100357693C (en) | 2007-12-26 |
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| CN101216252B (en) * | 2008-01-10 | 2010-10-06 | 株洲冶炼集团股份有限公司 | Large power electric stove induction apparatus rehabilitate method |
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| CN101957139B (en) * | 2010-10-18 | 2013-01-23 | 哈尔滨东安汽车动力股份有限公司 | Furnace lining repairing technology |
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| CN103234354B (en) * | 2013-04-23 | 2016-08-03 | 安徽全柴天和机械有限公司 | A kind of intermediate frequency furnace lining method for repairing and mending |
| CN103411435B (en) * | 2013-07-24 | 2015-04-22 | 济南济钢铁合金厂 | Method for repairing furnace lining of intermediate frequency furnace used in steelmaking |
| CN103363807B (en) * | 2013-08-09 | 2015-06-17 | 河北冀凯铸业有限公司 | Method for forging, braking and sintering crucible in medium-frequency induction furnace |
| CN103591803B (en) * | 2013-10-23 | 2015-05-20 | 宜兴市龙宸炉料有限公司 | Induction furnace lining repairing structure and repairing method thereof |
| CN104596290A (en) * | 2013-10-30 | 2015-05-06 | 林州市林丰铝电有限责任公司 | Method for prolonging furnace life of intermediate frequency furnace |
| CN103791721B (en) * | 2014-02-13 | 2015-05-06 | 山西太钢不锈钢股份有限公司 | Thermal test method of medium-frequency induction furnace |
| CN107860231A (en) * | 2017-12-01 | 2018-03-30 | 哈尔滨东安汽车动力股份有限公司 | Below 1t electric induction furnace quartz sand lining sintering process |
| CN108642232B (en) * | 2018-05-15 | 2019-10-29 | 首钢集团有限公司 | A kind of converter benefit bottom method |
| CN111664709A (en) * | 2020-06-09 | 2020-09-15 | 昆山市昌坚铸造有限公司 | Method for repairing bottom of electric furnace for casting |
| CN112414143B (en) * | 2020-10-29 | 2023-02-28 | 西安合力汽车配件有限公司 | Lining furnace knotting repair process |
| CN113008733B (en) * | 2021-02-07 | 2023-12-08 | 中冶武汉冶金建筑研究院有限公司 | Upper feeding type thermal state repair material spreadability test furnace and test method |
| CN113758257A (en) * | 2021-08-02 | 2021-12-07 | 东风本田汽车零部件有限公司 | On-line repairing method for furnace lining of molten metal smelting furnace |
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