CN110042196A - A kind of resistance to material furnace retaining method of coverter pig sizing - Google Patents

A kind of resistance to material furnace retaining method of coverter pig sizing Download PDF

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Publication number
CN110042196A
CN110042196A CN201910212765.4A CN201910212765A CN110042196A CN 110042196 A CN110042196 A CN 110042196A CN 201910212765 A CN201910212765 A CN 201910212765A CN 110042196 A CN110042196 A CN 110042196A
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China
Prior art keywords
clinker
resistance
furnace
sizing
fettling
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Pending
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CN201910212765.4A
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Chinese (zh)
Inventor
张振杰
周桂成
张红军
张小伟
解生元
周孝伟
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Nanjing Iron and Steel Co Ltd
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Nanjing Iron and Steel Co Ltd
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Priority to CN201910212765.4A priority Critical patent/CN110042196A/en
Publication of CN110042196A publication Critical patent/CN110042196A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/44—Refractory linings
    • C21C5/441—Equipment used for making or repairing linings
    • C21C5/443—Hot fettling; Flame gunning

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a kind of resistance to material furnace retaining methods of coverter pig sizing, specifically includes the following steps: (1) waste and old resistance to material of sizing is selected；(2) selection of clinker and pre- allowance；(3) the sizing fettling of resistance to material；The furnace retaining method is simple and easy; after converter tapping; how much determine to stay in clinker in furnace according to the resistance to material amount of the sizing of the size of the quantity of slag and needs; clinker rapid cooling is promoted to be bonded together after waste magnesia carbon brick or magnesite is added; utilize temperature difference existing for clinker and furnace lining interface; pass through phase counterdiffusion between mineral; so that clinker and furnace lining is become an entirety and achievees the effect that fettling; slow down the erosive velocity of furnace lining working lining; be conducive to protect the unimpeded of bottom blowing pipeline, realize bottom blowing long-acting " visualization " operation.

Description

A kind of resistance to material furnace retaining method of coverter pig sizing
Technical field
The invention belongs to iron and steel technical fields, are related to a kind of resistance to material furnace retaining method of coverter pig sizing.
Background technique
Structure is complicated for 150 tons of converter smelting variety steels of Nangang, and low-carbon low-phosphor steel ratio is big, and converter smelting endpoint molten steel oxygen contains Amount is higher, and finishing slag oxidisability is strong, causes furnace bottom erosion decrease speed fast, in order to safeguard that certain furnace bottom thickness, furnace use as a servant later period quilt Compel to reduce bottom blowing flow and pressure, while maintaining certain furnace bottom thickness between the application pad added time.Converter bottom position have 6 pieces thoroughly Gaseous core brick, every piece of porous core brick are distributed the stainless steel capillary of 23 diameter 3mm, conventional mending material fettling technique: use steel scrap Mending material is added in furnace and is shaken furnace body by bucket and artificial throwing method, so that mending material is had certain flowing using converter waste heat Property, so that it is spread over furnace lining or slag blanket damaged part, plays the role of protecting furnace lining；It is primary to need 50~60min or so, blowing out Time is long, restricting continuous production；And higher operating costs, environment is polluted, there are security risks；Mending material is easily caused to block Bottom blowing capillary, influences air permeability effect.
It is used to seek the reasonable disposition of whole resource, improves production efficiency, using waste magnesia carbon brick (or magnesite Stone) the sizing fettling of resistance to material, effective fettling operation can be carried out to converter lining furnace bottom weak location in a short time, this method was both Quickly and effectively fettling effect can be played to furnace bottom, while can protect the gas permeability of bottom blowing element again, realize that bottom blowing is long-term " visualization " operation, is an innovative technology of converter operation area, main method is after tapping, according to the big of the quantity of slag How much the resistance to material amount of sizing that is small and needing determines to stay in clinker in furnace, promotes the fast quickly cooling of clinker after useless brick or magnesite is added But it is bonded together.Using temperature difference existing for clinker and furnace lining interface, by phase counterdiffusion between mineral, make clinker and furnace lining at Achieve the effect that fettling for an entirety, slow down the erosive velocity of furnace lining working lining, is conducive to protect the unimpeded of bottom blowing pipeline.
Summary of the invention
The technical problem to be solved by the present invention is to, the shortcomings that overcoming the prior art, a kind of coverter pig is provided and is formed resistance to material Furnace retaining method, the furnace retaining method is simple and easy, after converter tapping, according to the resistance to material amount of the sizing of the size of the quantity of slag and needs It is how many to determine to stay in clinker in furnace, promote clinker rapid cooling to be bonded together after waste magnesia carbon brick or magnesite is added, benefit The temperature difference existing for clinker and furnace lining interface is made clinker and furnace lining become an entirety and is reached by phase counterdiffusion between mineral The effect of fettling slows down the erosive velocity of furnace lining working lining, be conducive to protect bottom blowing pipeline it is unimpeded, realize bottom blowing is long-acting " can Depending on changing " operation.
Be formed resistance to material furnace retaining method in order to solve the above technical problems, the present invention provides a kind of coverter pig, specifically include with Lower step:
(1) the waste and old resistance to material of sizing is selected
After converter lining furnace bottom thickness is lower than target 1100mm value, magnesite or magnesium are selected according to the length of nonproductive time Carbon brick；
(2) selection of clinker and pre- allowance
Fettling clinker has a mobility, and clinker chooses terminal C content 0.060~0.080%, clinker TFe content 15~ 18% clinker, while MgO >=8% in terminal clinker is controlled, basicity R >=3.0, it is in mass ratio that the pre- allowance of the quantity of slag, which reserves principle, The resistance to material of meter sizing: clinker=1:(7~8) ton；
(3) the sizing fettling of resistance to material
After tapping, principle is reserved by the pre- allowance of clinker, chooses resistance to material of being formed, the resistance to material that will be formed, which is filled in hopper, utilizes row The vehicle resistance to material that will be formed is added in furnace, and furnace body is then shaken vertical position, splashes slag operation again after guaranteeing sintering process time requirement, complete At fettling technique.
The technical solution that the present invention further limits is:
Further, aforementioned coverter pig is formed in resistance to material furnace retaining method, filling time of magnesite described in step (1) 10~ 15min, the filling time of waste magnesia carbon brick is in 15~20min.
Technical effect, according to furnace bottom decrease speed speed and nonproductive time number, determine to select magnesite or useless Brick, the filling time of magnesite, the filling time of waste magnesia carbon brick, can be flexible according to the two in 15~20min in 10~15min Adjustment, facilitates utilization.
Aforementioned coverter pig is formed in resistance to material furnace retaining method, selects magnesite if nonproductive time is within 15min；
Magnesia carbon brick is selected if nonproductive time is more than 15min.
Aforementioned coverter pig is formed in resistance to material furnace retaining method, and clinker includes: FeO:12.21-13.42% by mass percentage, CaO:39.93-42.96%, SiO2: 11.20-13.24%, MgO:8.00-9.00%, MnO:2.56-7.80%, Al2O3: 1.05- 1.39%, P2O5: 2.30-2.89%, TFe:15.23-17.90%, the sum of the above components are 100%.
Aforementioned coverter pig is formed in resistance to material furnace retaining method, step (2) when choosing clinker, if tapping carbon height or clinker compared with Dry, when judging that slag fluidity is poor in advance, after tapping, by blowing pattern switching at oxygen blast mode, lower rifle is opened oxygen and is blown Oxygen 10~30 seconds.
Technical effect: by blowing pattern switching at oxygen blast mode, lower rifle opens oxygen oxygen blast 10~30 seconds to improve the stream of clinker Dynamic property, to guarantee the agglomerability of sizing resistance to material and clinker.
The beneficial effects of the present invention are:
Present invention sizing must carry out splashing slag operation behind the fettling of resistance to material bottom, and Technology of Slag Splashingfor Furnace Maintenance is to reach saturation using content of MgO Or oversaturated steel-making terminal slag, purged by high pressure nitrogen, it is cooling, be set on furnace lining surface formed one layer it is dystectic molten Slag blanket, and bond attachment well with furnace lining.Splash slag formation splashes that slag blanket corrosion resistance is preferable, while can inhibit backup lining brick surface Oxidation and decarbonization, and high temperature sludge can be mitigated to the water eroding and flooding of backup lining brick, to protect backup lining brick, reduce refractory wear speed Degree reduces gunning material consumption, while mitigating labor intensity of workers, improves furnace lining service life, improves converter operating rate, reduces Production cost, splashing slag operation prevents still having shoddye in sintering time, by can further consolidate fettling effect after splashing slag operation, The effect of slag is splashed in guarantee, can carry out adding the operation of steel scrap hot metal charging after splashing slag.
Strict control clinker of the present invention, clinker choose terminal C content 0.060~0.080%, clinker TFe content 15~ 18% clinker, while MgO >=8% in terminal clinker is controlled, basicity R >=3.0, fettling clinker must have certain flowing Property, and can not peroxidating, the resistance to material of guaranteeing to be formed be added after can rapid subsidence to furnace bottom position.
Coverter pig of the invention is formed the method for resistance to material furnace retaining, after converter tapping, according to the size and need of the quantity of slag How much the resistance to material amount of the sizing wanted determines to stay in clinker in furnace, promotes clinker to be quickly cooled down after waste magnesia carbon brick or magnesite is added It is bonded together, becomes clinker with furnace lining by phase counterdiffusion between mineral using temperature difference existing for clinker and furnace lining interface One entirety achievees the effect that fettling, slows down the erosive velocity of furnace lining working lining.Be conducive to protect the unimpeded of bottom blowing pipeline, realize Bottom blowing long-acting " visualization " operation.
Detailed description of the invention
Fig. 1 is that coverter pig of the embodiment of the present invention is formed the flow chart of resistance to material furnace retaining method.
Specific embodiment
Embodiment 1
The resistance to material furnace retaining method of a kind of coverter pig sizing provided in this embodiment, as shown in Figure 1, this method is terminated by converter tapping Afterwards, how much determine to stay in clinker in furnace according to the resistance to material amount of sizing of the size of the quantity of slag and needs, useless brick or magnesite is added After promote clinker rapid cooling to be bonded together, using temperature difference existing for clinker and furnace lining interface, by mutually expanding between mineral It dissipates, so that clinker and furnace lining is become an entirety and achieve the effect that fettling.
The present embodiment selects the first converter lining furnace bottom position steel mill 3# on July 22 in 2018 to carry out testing for fettling effect Card measures convertor lining thickness measurement result according to furnace wall calibrator equipment on-line at that time and shows, furnace bottom position region property The thickness of 700mm is lower than target control value, is unfavorable for the normal tissue of produced on-site, the safety of the working of a furnace is influenced, according to the party Furnace bottom decrease speed described in method is very fast, now carries out the bottom operation of waste magnesia carbon brick fettling using this method, specifically includes Following steps:
(1) it is shown before fettling according to furnace wall calibrator measurement result, region is the regional weak location of furnace bottom 700mm, furnace bottom Thickness is uncontrolled, and bottom blowing general pipeline flow setting value is caused to be forced to be reduced to 150Nm3 by 300Nm3, the reduction of bottom blowing effect, and top bottom is multiple Function is blown to fail to give full play to；
(2) it chooses and smelts heat (batch) number 18306375, smelting endpoint molten steel carbon content 0.075%, Oxygen Content in Liquid Steel 312ppm, terminal furnace Slag good fluidity meets the needs of fettling clinker according to slag charge proportion, and clinker selection is suitable；
(3) according to the thickness of furnace bottom area 700mm, clinker selection is suitable, reserves distribution principle according to clinker, determines whole furnace Clinker is left and taken, and waste magnesia carbon brick selects 2 tons, and useless brick is put into hopper, is added in furnace by means of driving, and quick grate is to vertical Behind position, in order to rapid subsidence to furnace bottom, sintering time 20min is stood, carries out splashing slag operation, fettling technique knot again after sintering Beam, into downstream.
The present embodiment is after the fettling operation of this waste magnesia carbon brick, the converter lining furnace bottom thickness value of measurement, effect Obviously, the weak location of furnace bottom area 700mm, which is filled, comes, reached original furnace bottom target thickness 1100~ 1200mm illustrates that fettling plays actual application effect, bottom blowing flow has been restored to 300Nm3, has reached close to target control value Original bottom blowing effect is arrived.
Use furnace retaining method performance summary of the invention:
1., by the implementation for the fettling method of resistance to material of being formed after, furnace can be realized for furnace bottom weakness zone quickly and effectively fettling Use as a servant " visualization " operation of whole process bottom blowing effect.
2., the filling time greatly shortened than before to 10~20 minutes, improve the efficiency of nonproductive activity duration.
3., waste and old resource obtained reasonable disposition use, reached the maximization of the utilization of resources.
4., reduce Oxygen Content in Liquid Steel, reduce oxide in steel and be mingled with, promoted Molten Steel Cleanliness.
5., reduce because the use of mending material leads to problem of environmental pollution of smoldering, while avoiding bottom blowing capillary blockage.
When implementing present invention process, safety operation points for attention:
After the completion of fettling operation when next furnace tapping operation, due to washing away for high temperature gas flow and molten steel, the resistance to material in part might have It drops in furnace on slag liquid face, causes steel slag splashing plug for outlet.For the safety for ensuring personnel and equipment in tapping process, tapping is made Must assure that during industry forbids someone to stop, walk and operation after furnace within the scope of 120 ° of fire-screen door.
The present invention by the resource rational utilization of field practice operating experience and waste and old resistance to material, using waste magnesia carbon brick (or Magnesite) the sizing fettling of resistance to material, effective fettling operation, the party can be carried out to converter lining furnace bottom weak location in a short time Method can not only play quickly and effectively fettling effect to furnace bottom, but also can protect the gas permeability of bottom blowing element, realize bottom blowing " visualization " operates for a long time.Guarantee furnace bottom thickness targets stablize in 1100mm~1200mm, avoid furnace bottom blocked up or it is excessively thin and Converter smelting effect is influenced, realizes the bottom blowing big flow of furnace labour all stage, molten steel terminal oxygen content is effectively reduced, promotes molten steel Degree of purity saves deoxidier aluminium block loss per ton steel 0.13kg/t steel, and the filling time is greatly shortened by original 30~40min that has a snack To 10~20min, the efficiency of nonproductive time is improved.
In the present embodiment, clinker includes: FeO:12.21-13.42%, CaO:39.93- by mass percentage 42.96%, SiO2: 11.20-13.24%, MgO:8.00-9.00%, MnO:2.56-7.80%, Al2O3: 1.05-1.39%, P2O5: 2.30-2.89%, TFe:15.23-17.90%, the sum of the above components are 100%.
In the present embodiment, step (2), if tapping carbon is high or clinker is more dry, judges clinker stream when choosing clinker in advance When dynamic property is poor, after tapping, will blowing pattern switching at oxygen blast mode, lower rifle opens oxygen oxygen blast 10~30 seconds.
The present invention furnace retaining method is simple and easy, after converter tapping, according to the sizing of the size of the quantity of slag and needs How much resistance to material amount determines to stay in clinker in furnace, promotes clinker rapid cooling to cohere one after waste magnesia carbon brick or magnesite is added It rises, so that clinker and furnace lining is become an entirety by phase counterdiffusion between mineral using temperature difference existing for clinker and furnace lining interface Achieve the effect that fettling, slow down the erosive velocity of furnace lining working lining, be conducive to protect the unimpeded of bottom blowing pipeline, realizes that bottom blowing is long-acting " visualization " operation.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape At technical solution, fall within the scope of protection required by the present invention.

Claims (5)

  1. A kind of resistance to material furnace retaining method 1. coverter pig is formed, which is characterized in that specifically includes the following steps:
    (1) the waste and old resistance to material of sizing is selected
    After converter lining furnace bottom thickness is lower than target 1100mm value, magnesite or magnesium are selected according to the length of nonproductive time Carbon brick；
    (2) selection of clinker and pre- allowance
    Fettling clinker has a mobility, and clinker chooses terminal C content 0.060~0.080%, clinker TFe content 15~ 18% clinker, while MgO >=8% in terminal clinker is controlled, basicity R >=3.0, it is in mass ratio that the pre- allowance of the quantity of slag, which reserves principle, The resistance to material of meter sizing: clinker=1:(7~8) ton；
    (3) the sizing fettling of resistance to material
    After tapping, principle is reserved by the pre- allowance of clinker, chooses resistance to material of being formed, the resistance to material that will be formed, which is filled in hopper, utilizes row The vehicle resistance to material that will be formed is added in furnace, and furnace body is then shaken vertical position, splashes slag operation again after guaranteeing sintering process time requirement, complete At fettling technique.
  2. The resistance to material furnace retaining method 2. coverter pig according to claim 1 is formed, it is characterised in that: magnesite described in step (1) The filling time of stone, the filling time of waste magnesia carbon brick was in 15~20min in 10~15min.
  3. The resistance to material furnace retaining method 3. coverter pig according to claim 2 is formed, it is characterised in that:
    Magnesite is selected if nonproductive time is within 15min；
    Magnesia carbon brick is selected if nonproductive time is more than 15min.
  4. The resistance to material furnace retaining method 4. coverter pig according to claim 2 is formed, it is characterised in that:
    The clinker includes: FeO:12.21-13.42%, CaO:39.93-42.96%, SiO by mass percentage2: 11.20- 13.24%, MgO:8.00-9.00%, MnO:2.56-7.80%, Al2O3: 1.05-1.39%, P2O5: 2.30-2.89%, TFe: 15.23-17.90%, the sum of the above components are 100%.
  5. The resistance to material furnace retaining method 5. coverter pig according to claim 1 is formed, it is characterised in that: step (2) is choosing clinker When, if tapping carbon is high or clinker is more dry, when judging that slag fluidity is poor in advance, after tapping, by the pattern switching that blows At oxygen blast mode, lower rifle opens oxygen oxygen blast 10~30 seconds.
CN201910212765.4A 2019-03-20 2019-03-20 A kind of resistance to material furnace retaining method of coverter pig sizing Pending CN110042196A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111792920A (en) * 2020-06-20 2020-10-20 鞍山赛诺新材料有限公司 Novel environment-friendly converter quick repairing material
CN114774623A (en) * 2022-05-18 2022-07-22 阳春新钢铁有限责任公司 Method for quickly repairing furnace by using magnesite
CN115161427A (en) * 2022-05-26 2022-10-11 玉溪新兴钢铁有限公司 Converter quick-repairing method based on waste refractory material
CN115287392A (en) * 2022-08-10 2022-11-04 柳州钢铁股份有限公司 Quick maintenance method for converter slag pouring surface and furnace bottom lining

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001089806A (en) * 1999-09-20 2001-04-03 Kawasaki Steel Corp Hot-repairing method of converter
CN104673966A (en) * 2015-01-22 2015-06-03 河北钢铁股份有限公司承德分公司 Method for rapidly maintaining converter lining
CN105087849A (en) * 2015-08-28 2015-11-25 东北大学 Method for repairing converter lining
CN108728603A (en) * 2018-06-28 2018-11-02 承德建龙特殊钢有限公司 A kind of method of quick fettling
CN109055654A (en) * 2018-09-05 2018-12-21 鞍钢股份有限公司 Furnace protection method for repairing furnace by using dolomite
CN109182643A (en) * 2018-10-15 2019-01-11 马鞍山钢铁股份有限公司 A kind of method of converter finishing slag repairing tapping face furnace lining

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001089806A (en) * 1999-09-20 2001-04-03 Kawasaki Steel Corp Hot-repairing method of converter
CN104673966A (en) * 2015-01-22 2015-06-03 河北钢铁股份有限公司承德分公司 Method for rapidly maintaining converter lining
CN105087849A (en) * 2015-08-28 2015-11-25 东北大学 Method for repairing converter lining
CN108728603A (en) * 2018-06-28 2018-11-02 承德建龙特殊钢有限公司 A kind of method of quick fettling
CN109055654A (en) * 2018-09-05 2018-12-21 鞍钢股份有限公司 Furnace protection method for repairing furnace by using dolomite
CN109182643A (en) * 2018-10-15 2019-01-11 马鞍山钢铁股份有限公司 A kind of method of converter finishing slag repairing tapping face furnace lining

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111792920A (en) * 2020-06-20 2020-10-20 鞍山赛诺新材料有限公司 Novel environment-friendly converter quick repairing material
CN114774623A (en) * 2022-05-18 2022-07-22 阳春新钢铁有限责任公司 Method for quickly repairing furnace by using magnesite
CN115161427A (en) * 2022-05-26 2022-10-11 玉溪新兴钢铁有限公司 Converter quick-repairing method based on waste refractory material
CN115287392A (en) * 2022-08-10 2022-11-04 柳州钢铁股份有限公司 Quick maintenance method for converter slag pouring surface and furnace bottom lining
CN115287392B (en) * 2022-08-10 2023-10-27 柳州钢铁股份有限公司 Method for rapidly maintaining converter slag pouring surface and converter bottom lining

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