CN109136456B - A kind of method of converter application lime stone steel-making - Google Patents

A kind of method of converter application lime stone steel-making Download PDF

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Publication number
CN109136456B
CN109136456B CN201811322103.4A CN201811322103A CN109136456B CN 109136456 B CN109136456 B CN 109136456B CN 201811322103 A CN201811322103 A CN 201811322103A CN 109136456 B CN109136456 B CN 109136456B
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lime stone
steel
oxygen
lime
period
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CN109136456A (en
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吴政
龙川江
汪宁
潘永飞
靳随城
兰天
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Baosteel Zhanjiang Iron and Steel Co Ltd
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Baosteel Zhanjiang Iron and Steel Co Ltd
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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
    • C21C5/36—Processes yielding slags of special composition
    • 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
    • C21C5/30—Regulating or controlling the blowing
    • C21C5/32—Blowing from above
    • 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)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a kind of methods of converter application lime stone steel-making, wherein in being fitted into metal charge, the mass percent of molten iron is 80%~100%, remaining is steel scrap or pig iron；In convertor steelmaking process, it is directly added into lime stone and carries out slagging and producing steel, after oxygen rifle igniting, 1~3 investment of lime stone point, every batch of lime stone input amount is 2~25kg/ tons of steel, first lime stone is put into simultaneously with other slag materials, the 10%~100% of the total lime stone of lime stone input amount Zhan, second batch lime stone is put into initial smelting period, lime stone input amount accounts for the 10%~90% of remaining lime stone, remaining lime stone finishes before oxygen blast reaches 50%, lime stone additional amount is calculated according to wherein CaO, the heat lime is accounted for be added between the 10% to 100% of total amount, ton steel lime stone unit consumption control is in 2 ~ 38kg；Wherein, oxygen rifle position carries out control rifle oxygen supply intensity using strong-weak-strong offering oxygen way using the rifle position control model of high-low-high；Bottom blowing gas intensity uses strong-weak-strong plenum system.

Description

A kind of method of converter application lime stone steel-making
Technical field
The invention belongs to a kind of methods that technical field of steel production more particularly to converter application lime stone are made steel.
Background technique
Pneumatic steelmaking by the completion of means such as oxygen supply, slag making, stirring by force decarburization, carbon oxygen, go field trash, go pernicious gas, Desulfurization, dephosphorization basic task, wherein the auxiliary material of slag making is mainly lime, light-burned, magnesium ball, magnesite, dolomite etc., in auxiliary material The major function of lime is to provide CaO molecule, the product P that CaO can be aoxidized with P elements in molten steel2O5Reaction generates 4CaO P2O5With 3CaOP2O5, achieve the purpose that liquid steel dephosphorization.Traditional pneumatic steelmaking mainly uses lime to carry out slag making dephosphorization, reaches Dephosphorization purpose is made steel, major part steel plant are using lime slagging and producing steel at present.
Coverter pig lime is generated by calcined limestone, and a large amount of dust and CO can be generated in calcination process2, these It pollutes the environment, while calcined lime requires cool to room temperature, then notifies belt-conveying to converter furnace top bin, supply Converter uses, and in the process, hot lime conversion is that cold lime process needs heat release, this partial heat directly wastes, and can not return It receives, with the dusting of part lime in lime temperature-fall period, reduces lime recovery rate.Therefore some steel mills begin trying using Lime stone is made steel, and lime stone is added directly into Converter and is made steel, and the CaO participation that lime stone is generated by thermal decomposition is made Slag, the CO of generation2CO and corresponding oxide (oxide enters clinker) are generated with element reactions such as Fe, Si, Mn, C in molten iron, this Lime stone service efficiency is not only increased, and reduces energy waste, reduces CO2With the generation of dust, environmentally friendly guarantor Shield.
The patent about coverter pig lime stone method for making steel has following 3, patent CN102766723B at present, a kind of oxygen Top-blown converter makes steel rifle position control method with slagging with Lime stone, and core technology point is controlled using " low-low-high " rifle position, this The control of kind rifle position is the disadvantage is that initial smelting period and mid-term cause FeO in initial smelting period and mid-term vessel slag using the smelting of low rifle positionxContain Measure low, slag getting dry is serious, increases the probability that oxygen rifle glues cold steel and leak.Patent CN101525678A, one kind is on oxygen top The method that replacing lime with limestone for slagging and producing steel is used in blow converter, core technology point are made steel using lime stone, lime stone point 4 ~8 additions increase lime stone and put into batch, to reduce every batch of lime stone input amount, the shortcomings that the method is that lime stone is thrown Indegree is more, in addition smelting process is there are also investment part lime and other slag materials, the number that feeds intake is more, and smelting process is more uneven It surely, is when lime stone being added when smelting mid-term to be particularly easy to that oxygen rifle is caused to glue cold steel by it, in addition, this patent lime stone is put into Opportunity does not illustrate with every batch of input amount.Patent CN107574281A, with slagging with Lime stone-single slag process production Low-phosphorus Steel or extremely low The method of phosphoretic steel, core technology point are that total additional amount of ton steel lime stone and dolomite is 40~100 kilograms, wherein white clouds The shortcomings that stone is about the 1/4~1/5 of lime stone weight, the method is that lime stone and dolomite additional amount are excessive, causes ore Additional amount is few, or even can not be added, and ultimately causes slugging difficulty, influences dephosphorization efficiency.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of converter application lime stone steel-making, it is intended to solve existing lime stone refining The slag getting dry of steel method is serious, increases probability and lime stone and dolomite additional amount mistake that oxygen rifle glues cold steel and leak It is more, it causes ore additional amount few, leads to the technical issues of causing slugging difficult, influencing dephosphorization efficiency.
Technical scheme is as follows: a kind of method of converter application lime stone steel-making, wherein be packed into metal charge In, the mass percent of molten iron is 80%~100%, remaining is steel scrap or pig iron；In convertor steelmaking process, it is directly added into Lime stone carries out slagging and producing steel, after oxygen rifle igniting, point of 1~3 time investment of lime stone, and every batch of lime stone input amount is 2~ 25kg/ tons of steel, first lime stone are put into simultaneously with other slag materials, and the 10%~100% of the total lime stone of lime stone input amount Zhan, Second batch lime stone is put into initial smelting period, and lime stone input amount accounts for the 10%~90% of remaining lime stone, remaining lime stone is being blown Oxygen finishes before reaching 50%, and lime stone additional amount is calculated according to wherein CaO, accounts for total amount is added in the heat lime 10% to 100% Between, ton steel lime stone unit consumption is controlled in 2 ~ 38kg；
Wherein, in Primary period, the high rifle position oxygen blast for oxygen rifle position being dropped to the lime slagging and producing steel later period is blown once opening； In blowing mid-term, this rifle position is continued to, improves carbon period slag getting dry state；In the blowing later period, controlled using low rifle position； Primary period, mid-term, the rifle position in later period are in H=(36~55) dLarynxChange in range, in formula: H is height of the spray head away from bath surface Degree, unit mm；dLarynx: oxygen lance nozzle throat diameter, unit mm)；The Primary period, mid-term, the oxygen supply by lance in later period are strong Degree uses strong-weak-strong offering oxygen way in K=(2.1~3.6) Nm3/ (t.min) range；The Primary period, mid-term, after The bottom blowing gas intensity of phase is in Q=(0.01~0.16) Nm3/ (t.min) range, using strong-weak-strong plenum system.
The method of the described converter application lime stone steel-making, wherein in Primary period and blowing mid-term the H of high rifle position= (45~55) dLarynx。
The method of the converter application lime stone steel-making, wherein H=(40~45) d of low rifle position in the blowing later periodLarynx。
The method of the converter application lime stone steel-making, wherein in Primary period and oxygen supply intensity K=(2.5 in the later period ~3.1) Nm3/ (t.min).
The method of the converter application lime stone steel-making, wherein oxygen supply intensity K=(2.1~2.8) in blowing mid-term Nm3/(t.min)。
The method of the described converter application lime stone steel-making, wherein Primary period and bottom blowing gas intensity Q in the later period= (0.05~0.16) Nm3/ (t.min).
The method of the described converter application lime stone steel-making, wherein in blowing mid-term bottom blowing gas intensity Q=(0.01~ 0.1) Nm3/ (t.min).
Beneficial effects of the present invention: after using lime stone method for making steel of the present invention, due to using the low rifle position control of Gao-height- System and it is strong it is-weak-supply oxygen control mode by force, can preferably control slag getting dry early period and glue cold steel with oxygen rifle and be asked with oxygen rifle leak Topic, oxygen rifle leak number are reduced to 2~3 times monthly from 15 times/month；In addition, being made steel after using the present invention using lime stone When, fire door is made steel almost without packing phenomenon using lime stone, and converter dephosphorization efficiency makes steel compared with lime and improves 1-3%, smelting 0.5~1.5min of time shortening is refined, lime unit consumption ton steel reduces by 1~20kg/t, and the converter quantity of slag reduces by 5%~10%, ton steel coal gas Recycling increases by 1~7Nm3/t.
Detailed description of the invention
Fig. 1 is the rifle position control model schematic diagram of lime stone method for making steel of the invention.
Fig. 2 is the oxygen supply by lance intensity mode schematic diagram of lime stone method for making steel of the invention.
Fig. 3 is the bottom blowing gas intensity pattern diagram of lime stone method for making steel of the invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer and more explicit, right as follows in conjunction with drawings and embodiments The present invention is further described.
The invention discloses a kind of methods of converter application lime stone steel-making, wherein in being fitted into metal charge, the matter of molten iron Measuring percentage is 80%~100%, remaining is steel scrap or pig iron；In convertor steelmaking process, it is directly added into lime stone progress Slagging and producing steel, after oxygen rifle igniting, 1~3 investment of lime stone point, every batch of lime stone input amount is 2~25kg/ tons of steel, the A collection of lime stone is put into simultaneously with other slag materials, and the 10%~100% of the total lime stone of lime stone input amount Zhan, second batch lime stone It is put into initial smelting period, lime stone input amount accounts for the 10%~90% of remaining lime stone, remaining lime stone is before oxygen blast reaches 50% It finishing, lime stone additional amount is calculated according to wherein CaO, and it accounts for the heat lime and is added between the 10% to 100% of total amount, ton steel lime Stone unit consumption is controlled in 2 ~ 38kg；
Wherein, in Primary period, the high rifle position oxygen blast for oxygen rifle position being dropped to the lime slagging and producing steel later period is blown once opening； In blowing mid-term, this rifle position is continued to, improves carbon period slag getting dry state；In the blowing later period, controlled using low rifle position； Primary period, mid-term, the rifle position in later period are in H=(36~55) dLarynxChange in range, in formula: H is height of the spray head away from bath surface Degree, unit mm；dLarynx: oxygen lance nozzle throat diameter, unit mm)；The Primary period, mid-term, the oxygen supply by lance in later period are strong Degree uses strong-weak-strong offering oxygen way in K=(2.1~3.6) Nm3/ (t.min) range；The Primary period, mid-term, after The bottom blowing gas intensity of phase is in Q=(0.01~0.16) Nm3/ (t.min) range, using strong-weak-strong plenum system.
Using the control of Gao-height-low rifle position and it is strong it is-weak-supply oxygen control mode by force, can preferably control slag getting dry early period Cold steel and oxygen rifle seepy question are glued with oxygen rifle, oxygen rifle leak number is reduced to 2~3 times monthly from 15 times/month；In addition, using this After invention, when being made steel using lime stone, fire door is almost without packing phenomenon；Before this method, per tour needs to clear up fire door 2 ~3 times, after this method, per tour at most needs to clear up 1 time.
As shown in Figure 1, rifle position control difference is early period using high rifle position in the present invention, mid-term also uses high rifle position, Later period uses low rifle position；It is controlled using the low rifle position mode of Gao-height-.Therefore rule of thumb formula, Primary period can be with H control within the scope of (36-55) d larynx.
It adopts in practical control operation, in Primary period, oxygen rifle position is dropped to the lime slagging and producing steel later period once opening to blow High rifle position (H=(45~55) d larynx) oxygen blast, reduce since lime stone reaction acutely makes molten iron splashing adhere to oxygen rifle and cause oxygen The probability of rifle leak；It in blowing mid-term, continues to high rifle position (H=(45~55) d larynx), improves carbon period slag getting dry state； It in the blowing later period, is controlled using low rifle position ((H=(40~45) d larynx)), stronger melting bath stirring, accelerates reaction between carbon and oxygen speed.
As shown in Fig. 2, oxygen supply by lance intensity mode of the invention is controlled using strong-weak-strong intensity manner, oxygen rifle Oxygen supply intensity variation in K=(2.1~3.6) Nm3/ (t.min) range；In Primary period, oxygen supply intensity K=(2.5~3.1) Nm3/ (t.min) reinforces melting bath stirring using larger air supply intensity, promotes reaction；In blowing mid-term, oxygen supply intensity K=(2.1 ~2.8) Nm3/ (t.min), smaller air supply intensity increase FeO in slag using soft blow methodxContent；In the blowing later period, K=(2.5 ~3.1) Nm3/ (t.min) improves oxygen rifle jet stream penetration power using larger air supply intensity, reinforces melting bath stirring, and it is anti-to accelerate carbon oxygen Answer speed.
As shown in figure 3, bottom blowing oxygen rifle of the invention is controlled using strong-weak-strong intensity manner, Primary period, in The interior variation of bottom blowing gas intensity Q=(0.01~0.16) Nm3/ (t.min) range of phase, later period；In Primary period, air supply intensity Q =(0.05~0.16) Nm3/ (t.min) reinforces melting bath stirring using larger air supply intensity, promotes reaction；In blowing mid-term, supply Gas intensity Q=(0.01~0.1) Nm3/ (t.min), smaller air supply intensity, reaction between carbon and oxygen is violent at this time, and molten steel stirring is strong, no Need biggish air supply intensity；In the blowing later period, air supply intensity Q=(0.05~0.16) Nm3/(t.min), using larger gas supply Intensity reinforces melting bath stirring, accelerates reaction between carbon and oxygen speed.
The converter that the method for the present invention is also applied for not bottom blowing is made steel using lime stone.
It is made steel in existing technology using lime, initial smelting period, mid-term, later period rifle position are usually high-low-high, are turned Furnace dephosphorization occurs mainly in initial smelting period and later period, in order to improve converter dephosphorization efficiency, needs early period to smelt using high rifle position, and It adds iron ore (main component is FeO, Fe2O3), improves clinker FeOxContent.Mid-term is smelted, decarburizing reaction, furnace takes place FeO in slagxIt is chemically reacted with carbon in molten iron: x [C]+(FeOx)=x { CO }+[Fe], FeO in clinkerxContent is higher, this is anti- Should be fiercer, it is more to generate CO gas, and because of FeOxIt is the substance for reducing slag viscosity, content is higher, slag fluidity Better, gas generated big in CO, slag fluidity is good, and clinker is easy to blister, gas producer slag splash, so smelting mid-term Rifle position must reduce, and reduce FeO in clinkerx, to improve cinder viscosity, unit time CO yield is reduced, to reach control The purpose of splash processed.
It is also to be smelted using low rifle position smelting mid-term, reason is as lime steelmaking process in stone steel lime stone steelmaking process.
And the present invention is controlled using the smelting of high rifle position instead in smelting mid-term, reason is the stone in the addition of the initial stage of smelting Lime stone swim on iron liquid face (lime stone density be 2700kg/m3, molten iron density be 7900kg/m3, lime stone density ratio molten iron It is similar 3 times small), thus the CO2 that generates of decomposition of limestone some directly take away and be not engaged in real reaction, in clinker FeOxThere is no increase how much, in addition using lime stone steel-making after, in initial smelting period, be almost not added iron ore be used to increase clinker Middle FeOx, that is to say, that after the present invention is using lime stone steel-making, arrives and smelt mid-term, FeO in clinkerxContent is less than lime steel-making Smelt FeO in mid-term clinkerxContent.So using low rifle position smelting mid-term in practical lime stone steelmaking process It smelts, clinker tends to occur return dry, and oxygen rifle glues cold steel, oxygen rifle leak, and a middle of the month oxygen rifle leak reaches 15 (lime steel making oxygens Rifle leak January occurs 2-3 times).So the present invention will improve rifle position smelting mid-term, increase FeO in clinkerx, prevent clinker Middle FeOxIt is too low, slag getting dry is caused, slag getting dry be easy to cause oxygen rifle to glue cold steel, oxygen leak, is smelting mid-term using high After rifle position is smelted, oxygen rifle leak is significantly reduced, and oxygen rifle leak number is reduced to the 2-3 times/moon from 15 times/month.
Present lime steel-making, which smelts the later period with the steel-making of stone steel lime stone, is smelted using high rifle position, and reason is their smeltings Mid-term is smelted using low rifle position, when being smelted using low rifle position, FeO in slagxContent is lower, in the decarburization later period, in order to ensure Dephosphorization efficiency, it is to be ensured that contain a certain amount of FeO in clinkerx, therefore both methods was required to improve rifle position in the smelting later period, It is smelted using high rifle position, increases FeO in slagx, it is ensured that dephosphorization efficiency, this method drawback are that smelting the later period improves rifle position, really FeO in clinker is improved in factxOnce but FeOxContent is excessive, it is easy to which causing later period clinker splash, (splash at this time comes out It is mostly molten steel, very big to cost impact), other FeO in converter terminal slagxContent is higher, increases steel-making cost.
And the present invention is smelting mid-term, is smelted using high rifle position, FeO in clinkerxContent is higher, has arrived decarburization later period, slag Middle FeOxContent is still higher, therefore can ensure to contain a certain amount of FeO in clinkerx, meet dephosphorization needs, in addition in decarburization Later period adopts this programme using low rifle position, advantage: improves and smelts stability, less later period splash；Reinforce the stirring to molten steel, mentions High dephosphorization efficiency；Reduce FeO in converter terminal slagxContent, to reduce steel-making cost.
The present invention is made steel using lime stone simultaneously, and converter dephosphorization efficiency is made steel compared with lime improves 1-3%, and the duration of heat shortens 0.5~1.5min, lime unit consumption ton steel 1~20kg/t of reduction, converter quantity of slag reduction by 5%~10%, ton steel coal-gas recovering increase by 1~ 7Nm3/t。
Embodiment 1
In the converter that nominal capacity is 350 tons, the total lime consumption 64.6% of amount of lime Zhan, metal charge is 91.7% Molten iron, 9.3% steel scrap, entering furnace molten iron temperature is 1410 DEG C, and entering furnace molten iron silicon is 0.35%, and lime stone is according to 26.71kg/ tons of steel Amount be added, lime stone disposable all additions after oxygen rifle light a fire successfully, Primary period rifle position is according to smelting situation one Determine adjustment, oxygen lance position H=(47~50) d in rangeLarynxVariation in range, oxygen supply by lance intensity are 2.85Nm3/ (t.min), bottom Air supply intensity is blown for 0.06Nm3/ (t.min), and after oxygen blast 6min, rifle position adjusts in a certain range according to situation is smelted, oxygen rifle Rifle position H=(45~46) dLarynxVariation in range, oxygen supply by lance intensity are 2.58Nm3/ (t.min), and bottom blowing gas intensity is After 0.045Nm3/ (t.min), oxygen blast 11min, rifle position adjusts in a certain range according to situation is smelted, and oxygen lance position H=(42~ 43) dLarynxVariation in range, oxygen supply by lance intensity are 3.05Nm3/ (t.min), and bottom blowing gas intensity is 0.076Nm3/ (t.min), After oxygen blast 14.5min, oxygen rifle, which bottoms out, carries out sublance measurement, and measuring temperature is 1621 DEG C, crystalline carbon 1790ppm, secondary Oxygen supply by lance intensity and bottom blowing gas intensity are constant after rifle measurement, rifle position H=38dLarynx, then terminate blowing after oxygen blast 2.0min, always blow Oxygen time 16.5min, tapping temperature are 1661 DEG C, and free oxygen 603ppm, blow off carbon, phosphorus, sulphur meet component requirements.
Embodiment 2
In the converter that nominal capacity is 350 tons, the total lime consumption 22.2% of amount of lime Zhan, metal charge is 86.5% Molten iron, 13.5% steel scrap, entering furnace molten iron temperature is 1334 DEG C, and entering furnace molten iron silicon is 0.41%, and lime stone is according to 11.3kg/ tons of steel Amount be added, lime stone disposable all additions after oxygen rifle light a fire successfully, Primary period rifle position is according to smelting situation one Determine adjustment, oxygen lance position H=(48~50) d in rangeLarynxVariation in range, oxygen supply by lance intensity are 2.89Nm3/ (t.min), bottom Air supply intensity is blown for 0.05Nm3/ (t.min), and after oxygen blast 6.5min, rifle position adjusts in a certain range according to situation is smelted, oxygen Rifle rifle position H=(46~48) dLarynxVariation in range, oxygen supply by lance intensity are 2.4Nm3/ (t.min), and bottom blowing gas intensity is After 0.042Nm3/ (t.min), oxygen blast 12.4min, rifle position adjusts in a certain range according to situation is smelted, oxygen lance position H=(40 ~43) dLarynxVariation in range, oxygen supply by lance intensity are 3.10Nm3/ (t.min), bottom blowing gas intensity 0.070Nm3/ (t.min), after oxygen blast 15.1min, oxygen rifle, which bottoms out, carries out sublance measurement, and measuring temperature is 1635 DEG C, crystalline carbon 1120ppm, oxygen supply by lance intensity and bottom blowing gas intensity are constant after sublance measurement, rifle position H=38dLarynx, then tie after oxygen blast 1.9min Beam blowing, total oxygen blow duration 17.0min, tapping temperature are 1653 DEG C, and free oxygen 546ppm, blow off carbon, phosphorus, sulphur meet ingredient It is required that.
Embodiment 3
In the converter that nominal capacity is 350 tons, the total lime consumption 100% of amount of lime Zhan, metal charge is 92.1% Molten iron, 7.9% steel scrap, entering furnace molten iron temperature is 1445 DEG C, and entering furnace molten iron silicon is 0.48%, and lime stone is according to 38kg/ tons of steel Amount is added, and lime stone puts into three times, and the 57.1% of first time lime stone additional amount Zhan total lime stone, after oxygen blast 2min, second Put into lime stone, the 21.5% of the total amount of lime of lime stone Zhan, after oxygen blast 1.5min, put into remaining lime stone, Primary period rifle Position adjusts in a certain range according to situation is smelted, oxygen lance position H=(49~50) dLarynxVariation, oxygen supply by lance intensity are in range 2.76Nm3/ (t.min), bottom blowing gas intensity is 0.06Nm3/ (t.min), and after oxygen blast 6.3min, rifle position exists according to situation is smelted Adjustment, oxygen lance position H=(46~50) d in a certain rangeLarynxVariation in range, oxygen supply by lance intensity are 2.46Nm3/ (t.min), Bottom blowing gas intensity is 0.052Nm3/ (t.min), and after oxygen blast 11.5min, rifle position is adjusted in a certain range according to situation is smelted It is whole, oxygen lance position H=(42~45) dLarynxVariation in range, oxygen supply by lance intensity are 2.86Nm3/ (t.min), bottom blowing gas intensity For 0.066Nm3/ (t.min), after oxygen blast 14.2min, oxygen rifle, which bottoms out, carries out sublance measurement, measuring temperature 1614 DEG C, crystalline carbon 2531ppm, oxygen supply by lance intensity and bottom blowing gas intensity are constant after sublance measurement, rifle position H=39dLarynx, then oxygen blast After 2.0min terminate blowing, total oxygen blow duration 16.2min, tapping temperature be 1659 DEG C, free oxygen 614ppm, blow off carbon, phosphorus, Sulphur meets component requirements.
Embodiment 4
In the converter that nominal capacity is 350 tons, the total lime consumption 50% of amount of lime Zhan, the iron that metal charge is 100% Water, entering furnace molten iron temperature is 1376 DEG C, and entering furnace molten iron silicon is 0.24%, and lime stone is added according to the amount of 28.6kg/ tons of steel, lime Stone disposable all investments, Primary period rifle position after oxygen rifle is lighted a fire successfully adjust in a certain range according to situation is smelted, oxygen Rifle rifle position H=(46~48) dLarynxVariation in range, oxygen supply by lance intensity are 2.86Nm3/ (t.min) n, and bottom blowing gas intensity is After 0.076Nm3/ (t.min), oxygen blast 6.0min, rifle position adjusts in a certain range according to situation is smelted, oxygen lance position H=(46 ~47) dLarynxVariation in range, oxygen supply by lance intensity are 2.52Nm3/ (t.min), bottom blowing gas intensity 0.043Nm3/ (t.min), after oxygen blast 12.7min, rifle position adjusts in a certain range according to situation is smelted, oxygen lance position H=(40~43) dLarynxModel Interior variation is enclosed, oxygen supply by lance intensity is 3.12Nm3/ (t.min), and bottom blowing gas intensity is 0.076Nm3/ (t.min), oxygen blast After 14.7min, oxygen rifle, which bottoms out, carries out sublance measurement, and measuring temperature is 1622 DEG C, crystalline carbon 1318ppm, and sublance is surveyed Oxygen supply by lance intensity and bottom blowing gas intensity are constant after fixed, rifle position H=38dLarynx, then terminate blowing after oxygen blast 2.1min, when total oxygen blast Between 16.8min, tapping temperature be 1655 DEG C, free oxygen 652ppm, blow off carbon, phosphorus, sulphur meet component requirements.
After the present invention uses above-mentioned method for making steel, due to using the low rifle position control of Gao-height-and strong-weak-strong oxygen supply Control mode, can preferably control slag getting dry early period and oxygen rifle glues cold steel and oxygen rifle seepy question, and oxygen rifle leak number is from 15 It is reduced to 2~3 times monthly by secondary/moon；In addition, when being made steel using lime stone, fire door is almost without accumulation after using the present invention Phenomenon；Before using this method, per tour needs to clear up fire door 2~3 times, and after using this method, per tour at most needs to clear up 1 It is secondary, solve the problems, such as that the steel-making of prior art lime stone is two existing；And made steel using lime stone, converter dephosphorization efficiency is compared with stone Ash steel-making improves 1-3%, and the duration of heat shortens 0.5~1.5min, and lime unit consumption ton steel reduces by 1~20kg/t, and the converter quantity of slag reduces 5%~10%, ton steel coal-gas recovering increases by 1~7Nm3/t.
In addition, the present invention can apply in steel mill 1# converter, 2# converter and 3# converter, it is complete in the enterprise of similar steel-making The technology all can enough be applied.
It should be understood that the application of the present invention is not limited to the above for those of ordinary skills can With improvement or transformation based on the above description, all these modifications and variations all should belong to the guarantor of appended claims of the present invention Protect range.

Claims (5)

1. a kind of method of converter application lime stone steel-making, which is characterized in that in being fitted into metal charge, the mass percent of molten iron It is 80%~100%, remaining is steel scrap or pig iron；In convertor steelmaking process, it is directly added into lime stone and carries out slagging and producing steel, After oxygen rifle igniting, 1~3 investment of lime stone point, every batch of lime stone input amount is 2~25kg/ tons of steel, first lime stone It is put into simultaneously with other slag materials, the 10%~100% of the total lime stone of lime stone input amount Zhan, second batch lime stone is in initial smelting period Investment, lime stone input amount account for the 10%~90% of remaining lime stone, remaining lime stone finishes before oxygen blast reaches 50%, lime Stone additional amount is calculated according to wherein CaO, is accounted for the heat lime and is added between the 10% to 100% of total amount, ton steel lime stone unit consumption control System is in 2 ~ 38kg；
Wherein, in Primary period, the high rifle position oxygen blast for oxygen rifle position being dropped to the lime slagging and producing steel later period is blown once opening；It is blowing Mid-term is refined, this rifle position is continued to, improves carbon period slag getting dry state；In the blowing later period, controlled using low rifle position；Blowing Early period, mid-term, the rifle position in later period are in H=(36~55) dLarynxChange in range, in formula: H is height of the spray head away from bath surface, single Position is mm；dLarynx: oxygen lance nozzle throat diameter, unit mm)；The Primary period, mid-term, the oxygen supply by lance in later period using it is strong- Weak-strong offering oxygen way；The Primary period, mid-term, the bottom blowing gas intensity in later period are in Q=(0.01~0.16) Nm3/(t.min) In range, using strong-weak-strong plenum system；In Primary period and oxygen supply intensity K=(2.5~3.1) Nm in the later period3/ (t.min)；Oxygen supply intensity K=(2.1~2.8) Nm in blowing mid-term3/(t.min)。
2. the method for converter application lime stone steel-making according to claim 1, which is characterized in that in Primary period and blowing The H of high rifle position=(45~55) d in mid-termLarynx。
3. the method for converter application lime stone steel-making according to claim 1, which is characterized in that in the Primary period later period The H of low rifle position=(40~45) dLarynx。
4. the method for converter application lime stone steel-making according to claim 1, which is characterized in that in Primary period and later period Middle bottom blowing gas intensity Q=(0.05~0.16) Nm3/(t.min)。
5. the method for converter application lime stone steel-making according to claim 1, which is characterized in that the bottom blowing in blowing mid-term Air supply intensity Q=(0.01~0.1) Nm3/(t.min)。
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CN112251559A (en) * 2020-09-10 2021-01-22 南京钢铁股份有限公司 Converter low-calorific-value molten iron steelmaking method capable of supplying oxygen accurately
CN112609034A (en) * 2020-11-26 2021-04-06 柳州钢铁股份有限公司 Method for efficiently dephosphorizing low-temperature steel tapping in later period of converter
CN113234883B (en) * 2021-04-23 2022-03-15 甘肃酒钢集团宏兴钢铁股份有限公司 Smelting process of converter bottom blowing powder injection
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CN108411060A (en) * 2018-06-14 2018-08-17 宝钢湛江钢铁有限公司 A kind of method of coverter pig slagging with Lime stone steel-making control of lance position

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