CN107058672A - A kind of method of use hot metal containing low silicon converter smelting Low-phosphorus Steel - Google Patents
A kind of method of use hot metal containing low silicon converter smelting Low-phosphorus Steel Download PDFInfo
- Publication number
- CN107058672A CN107058672A CN201710357437.4A CN201710357437A CN107058672A CN 107058672 A CN107058672 A CN 107058672A CN 201710357437 A CN201710357437 A CN 201710357437A CN 107058672 A CN107058672 A CN 107058672A
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- Prior art keywords
- slag
- lime
- rifle
- converter
- hot metal
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Classifications
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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
- C21C5/30—Regulating or controlling the blowing
-
- 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
-
- 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
Abstract
The invention discloses a kind of method of use hot metal containing low silicon converter smelting Low-phosphorus Steel, it the described method comprises the following steps：1) smelt heat to start before charging, according to the requirement of the end phosphorus content of smelted steel grade and hot metal composition, determine remained converter slag amount, and calculate lime addition total amount；2) double slag early stage lime, ore addition are determined according to lime adding amount；3) open after blowing, scorification situation in the stove that operating personnel are monitored according to audio frequency slag melting, determine that double slags carry rifle opportunity with reference to the situation that fire door camera lens is monitored；4) carry after rifle, to purging nitrogen in stove, carry out iron operation of stopping；5) deslagging is finished to open again and blown, and is added lime, the ore of residue 50%, is made secondary slag dephosphorization；6) bessemerize and carry rifle, the deslagging of falling stove to terminal.The present invention is operated using double slag control methods, and converter terminal phosphorus content basically reaches target call, and converter dephosphorization phenomenon of re-blowing is significantly reduced, and body of heater situation is obviously improved.
Description
Technical field
The invention belongs to pneumatic steelmaking field, more particularly to a kind of method of use hot metal containing low silicon converter smelting Low-phosphorus Steel.
Background technology
When current major steel mill's converter uses hot metal containing low silicon low phosphorus steel by smelting, using single slag method, using increasing lime
Addition, improves end-point alkalinity, reduces the means such as tapping temperature to ensure process dephosphorization efficiency, and reaching end phosphorus content will
Ask.The method lime adding amount is not reasonable, and process temperature control is unstable, it may appear that the slugging of process clinker is difficult, dephosphorization effect
The phenomenons such as higher, the viscous rifle of really undesirable, converter terminal molten steel phosphorus content, are not sufficiently stable the whole control point of converter, it is impossible to meet low
The continuous production requirement of phosphoretic steel.Meanwhile, number of times of re-blowing increase meeting Eroded converter lining reduces life of converter, influence converter is each
Item economic and technical norms.Thus, it is necessary to take a kind of more reasonably smelting process, it is ensured that converter terminal phosphorus content is up to standard, full
Sufficient production requirement.For hot metal containing low silicon, smelted using the method for the double slags of slag is stayed, it is ensured that the slugging effect of smelting process,
For lifting Primary period dephosphorization rate, mitigate that returning for smelting process is dry, realize that the hit of effective terminal has preferable effect.
The content of the invention
It is an object of the present invention to provide a kind of method of use hot metal containing low silicon converter smelting Low-phosphorus Steel, this method can be with
Low-phosphorus Steel is met to converter terminal molten steel phosphorus content requirement, stable converter operation improves Target hit rate.
In order to achieve the above object, present invention employs following technical scheme：
A kind of method of use hot metal containing low silicon converter smelting Low-phosphorus Steel, the described method comprises the following steps：
1) heat is smelted to start before charging, according to the requirement of the end phosphorus content of smelted steel grade and hot metal composition, it is determined that
Remained converter slag amount, and calculate lime addition total amount：
Remained converter slag amount is determined with the method that end phosphorus content requirement is combined using molten iron silicon content：With molten iron silicon
0.40% is boundary, and it is 5-7 tons that the quantity of slag is stayed during molten iron silicon 0.40%, and molten iron silicon is higher than 0.40%, stays the quantity of slag to reduce by 1-2 tons, molten iron
Silicon is less than 0.40%, stays the quantity of slag to increase 1-2 tons；
Lime adds total amount and determined according to the requirement of terminal phosphorus, hot metal composition and basicity R, it is ensured that enough basicity dephosphorizations；
Lime adds total amount calculation formula：The effective * R*1000 of 2.14*si%/cao%；
Wherein, si% is molten iron silicon content；
Cao% is effectively the percentage composition of the efficient oxidation calcium in lime；
R is basicity；
2) double slag early stage lime, ore addition are determined according to lime adding amount：
Double slag early stage lime adding amounts add total amount 50% according to the lime calculated and added, and ore presses ore total amount 60%
Add；
3) open after blowing, scorification situation in the stove that operating personnel are monitored according to audio frequency slag melting is monitored with reference to fire door camera lens
Situation determine that double slags carry rifle opportunity：
Start rifle position using 1.6 meters of blowing, early stage rifle position brings up to 1.7 in 2 minutes using " low-high-high " control, blowing
Rice, 3 minutes to 1.8 meters, until proposing rifle deslagging；
4) carry after rifle, to purging nitrogen in stove, progress is stopped iron operation, stop iron when control of lance position in 3-5m, nitrogen blows
Flyback time was controlled at 20-40 seconds, and iron of stopping terminates to pour out primary slag；
5) deslagging is finished to open again and blown, and is added lime, the ore of residue 50%, is made secondary slag dephosphorization；It is secondary open blow after, will
Remaining ore amount is continuously added so that small lot is multiple batches of, until adding, it is ensured that have sufficient iron oxide in clinker, it is ensured that process
Low temperature dephosphorization；Thermometric sampling is carried out with sublance, it is ensured that temperature is not higher than 1570 DEG C when the later stage carbon content that blows is 0.30%；
6) bessemerize and carry rifle to terminal, the deslagging of falling stove carries out adding 300- after measurement terminates for the first time in sublance
500kg lime improves end-point alkalinity, reduces tapping process rephosphorization.
Preferably, it is described low-high-high specially 1.6 meters -1.7 meters -1.8 meters.
In the step 3) in, carry rifle opportunity determines jointly according to slugging effect and duration of blast：According to audio frequency slag melting
Curve, with reference to the monitoring of fire door camera lens, the good heat curve of slugging extends towards close to the direction of splash, stove in fire door camera lens
A little clinker can be overflowed on mouthful.It can carry out carrying rifle when there is such a state.
In the step 4) in, nitrogen stops the iron time should not be long, long clinker to be made to become sticky, and leads to not deslagging.Stop
Control of lance position is in 3-5m during iron, and nitrogen purge time was controlled at 20-40 seconds.
In the step 6) in, lime adds needs after sublance progress first time measurement terminates, and needs to shift to an earlier date
Weigh, additional amount is controlled in 300-500kg, it is to avoid add situation not in time.
The present invention can meet Low-phosphorus Steel to converter terminal molten steel phosphorus content requirement, stable converter operation, improve terminal life
Middle rate, promotes converter to reach more than 95%, a catch carbon rate using terminal phosphorus qualification rate during hot metal containing low silicon low phosphorus steel by smelting kind
Reach more than 93%.Avoid terminal to re-blow the Molten Steel over-oxidation situation caused, then improve alloy, the carburant rate of recovery,
Erosion of the molten steel to body of heater is alleviated, realizes that steady and continuous production provides powerful guarantee for full stove Yi.
Embodiment
Hereinafter, the double slag control methods of hot metal containing low silicon in the present invention are illustrated in detail.
Embodiment 1
A kind of method of use hot metal containing low silicon converter smelting Low-phosphorus Steel, the described method comprises the following steps：
1) heat is smelted to start before charging, according to the requirement of the end phosphorus content of smelted steel grade and hot metal composition, it is determined that
Remained converter slag amount, and calculate lime addition total amount：
Remained converter slag amount is determined with the method that end phosphorus content requirement is combined using molten iron silicon content：With molten iron silicon
0.40% is boundary, and it is 5-7 tons that the quantity of slag is stayed during molten iron silicon 0.40%, and molten iron silicon is higher than 0.40%, stays the quantity of slag to reduce by 1-2 tons, molten iron
Silicon is less than 0.40%, stays the quantity of slag to increase 1-2 tons；
Lime adds total amount and determined according to the requirement of terminal phosphorus, hot metal composition and basicity R, it is ensured that enough basicity dephosphorizations；
Lime adds total amount calculation formula：The effective * R*1000 of 2.14*si%/cao%；
Wherein, si% is molten iron silicon content；
Cao% is effectively the percentage composition of the efficient oxidation calcium in lime；
R is basicity, is worth for 4.5；
2) double slag early stage lime, ore addition are determined according to lime adding amount：
Double slag early stage lime adding amounts add total amount 50% according to the lime calculated and added, and ore presses ore total amount 60%
Add；
3) open after blowing, scorification situation in the stove that operating personnel are monitored according to audio frequency slag melting is monitored with reference to fire door camera lens
Situation determine that double slags carry rifle opportunity：
Start rifle position using 1.6 meters of blowing, early stage rifle position brings up to 1.7 in 2 minutes using " low-high-high " control, blowing
Rice, 3 minutes to 1.8 meters, until proposing rifle deslagging；
4) carry after rifle, to purging nitrogen in stove, progress is stopped iron operation, stop iron when control of lance position in 3-5m, nitrogen blows
Flyback time was controlled at 20-40 seconds, and iron of stopping terminates to pour out primary slag；
5) deslagging is finished to open again and blown, and is added lime, the ore of residue 50%, is made secondary slag dephosphorization；It is secondary open blow after, will
Remaining ore amount is continuously added so that small lot is multiple batches of, until adding, it is ensured that have sufficient iron oxide in clinker, it is ensured that process
Low temperature dephosphorization；Thermometric sampling is carried out with sublance, it is ensured that temperature is not higher than 1570 DEG C when the later stage carbon content that blows is 0.30%；
6) bessemerize and carry rifle to terminal, the deslagging of falling stove carries out adding 300- after measurement terminates for the first time in sublance
500kg lime improves end-point alkalinity, reduces tapping process rephosphorization.
It is described low-high-high specially 1.6 meters -1.7 meters -1.8 meters in the present embodiment.
Double slag control methods of the present invention essentially consist in stable top and bottom combined blown converter process blowing, it is ensured that end phosphorus content reaches
To steel grade requirement and continuous and stable production.
The present invention makes full use of high temperature furnace slag quickly to form high alkalinity, high oxidation iron hoop border, in Primary period quick dephosphorization
Effect.
Double slag early stages of the invention：Lime adding amount 50% is once added in an amount, and ore is added in two batches by 60%, it is ensured that
1 point added in 30 seconds after oxygen is opened.Start rifle position using 1.6 meters of blowing, early stage rifle position uses " low-high-high " control, blowing
Bring up within 2 minutes 1.7 meters, 3 minutes to 1.8 meters, until proposing rifle deslagging.
3rd, double slag later stages：Open again after being struck sparks normally after blowing, two batches of lime of addition, whole dolomites, ore is according to slugging
Situation and process temperature height small lot, multiple batches of addition.The sublance when the later stage carbon content that blows is about 0.30% or so
(TSC) thermometric sampling is carried out, it is ensured that temperature is not higher than 1570 DEG C.
Terminal point control of the present invention：Analyzed according to sublance TSC measurement results, temperature is high, the high situation of carbon adds lime, ore deposit
Stone, it is ensured that end phosphorus content is up to standard.Outlet temperature is controlled in 1630 DEG C, carbon 0.05% or so.
The present invention is by staying the double slags controls of slag to update and innovate using hot metal containing low silicon smelting heat, taking into full account
To different rifle positions, slag charge, the influence of rifle opportunity and temperature to converter terminal phosphorus content is proposed, to reach Optimal Control effect.
The present invention is according to above control method, using staying the double slag control methods of slag to be operated, converter terminal phosphorus content base
Originally target call is reached, converter dephosphorization phenomenon of re-blowing is significantly reduced, and body of heater situation is obviously improved, and can guarantee that Low-phosphorus Steel connects substantially
Continuous, steady production requirement.
It is the state of the art, here is omitted if there is the content not kept detailed accounts in this specification.
It should be noted last that, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that to the technical side of the present invention
Case is modified or equivalent substitution, and without departure from the spirit and scope of technical solution of the present invention, it all should cover in the present invention
Right among.
Claims (2)
1. a kind of method of use hot metal containing low silicon converter smelting Low-phosphorus Steel, the described method comprises the following steps：
1) smelt heat to start before charging, according to the requirement of the end phosphorus content of smelted steel grade and hot metal composition, determine converter
The quantity of slag is stayed, and calculates lime and adds total amount：
Remained converter slag amount is determined with the method that end phosphorus content requirement is combined using molten iron silicon content：It is with molten iron silicon 0.40%
Boundary, it is 5-7 tons that the quantity of slag is stayed during molten iron silicon 0.40%, and molten iron silicon is higher than 0.40%, stays the quantity of slag to reduce 1-2 tons, molten iron silicon is less than
0.40%, stay the quantity of slag to increase 1-2 tons；
Lime adds total amount and determined according to the requirement of terminal phosphorus, hot metal composition and basicity R, it is ensured that enough basicity dephosphorizations；
Lime adds total amount calculation formula：The effective * R*1000 of 2.14*si%/cao%；
Wherein, si% is molten iron silicon content；
Cao% is effectively the percentage composition of the efficient oxidation calcium in lime；
R is basicity；
2) double slag early stage lime, ore addition are determined according to lime adding amount：
Double slag early stage lime adding amounts add total amount 50% according to the lime calculated and added, and ore is added by ore total amount 60%
Enter；
3) open after blowing, scorification situation, the feelings monitored with reference to fire door camera lens in the stove that operating personnel are monitored according to audio frequency slag melting
Condition determines that double slags carry rifle opportunity：
Start rifle position using 1.6 meters of blowing, early stage rifle position brings up to 1.7 meters, 3 points for 2 minutes using " low-high-high " control, blowing
Clock is to 1.8 meters, until proposing rifle deslagging；
4) carry after rifle, to purging nitrogen in stove, progress is stopped iron operation, stop iron when control of lance position in 3-5m, when nitrogen is purged
Between control at 20-40 seconds, iron of stopping terminates to pour out primary slag；
5) deslagging is finished to open again and blown, and is added lime, the ore of residue 50%, is made secondary slag dephosphorization；It is secondary open blow after, by residue
Ore amount is continuously added so that small lot is multiple batches of, until adding, it is ensured that have sufficient iron oxide in clinker, it is ensured that process low temperature
Dephosphorization；Thermometric sampling is carried out with sublance, it is ensured that temperature is not higher than 1570 DEG C when the later stage carbon content that blows is 0.30%；
6) bessemerize and carry rifle to terminal, the deslagging of falling stove carries out adding 300-500kg stones after measurement terminates for the first time in sublance
Ash improves end-point alkalinity, reduces tapping process rephosphorization.
2. the method for use hot metal containing low silicon converter smelting Low-phosphorus Steel according to claim 1, it is characterised in that it is described it is low-
Gao-height is specially 1.6 meters -1.7 meters -1.8 meters.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109423533A (en) * | 2017-08-25 | 2019-03-05 | 鞍钢股份有限公司 | A kind of full dose molten iron converter smelting control method |
| CN110423856A (en) * | 2019-07-03 | 2019-11-08 | 山东钢铁股份有限公司 | A kind of smelting process of low temperature, hot metal containing low silicon dephosphorization catch carbon |
| CN110484679A (en) * | 2018-03-27 | 2019-11-22 | 上海梅山钢铁股份有限公司 | A kind of control method of the double slag meltings of converter |
| CN110904300A (en) * | 2019-12-27 | 2020-03-24 | 安徽工业大学 | Efficient dephosphorization and furnace protection method for converter slag melting point control model |
| CN112210638A (en) * | 2019-07-10 | 2021-01-12 | 山东钢铁股份有限公司 | Converter smelting method for medium and high silicon molten iron |
| CN113201622A (en) * | 2021-05-13 | 2021-08-03 | 山东鲁丽钢铁有限公司 | Method for smelting high-quality carbon steel by 120t converter |
| CN113435037A (en) * | 2021-06-25 | 2021-09-24 | 马鞍山钢铁股份有限公司 | Method for judging slag pouring time in early stage of cast residue smelting of 300t converter |
| CN114657314A (en) * | 2022-03-17 | 2022-06-24 | 山东钢铁集团日照有限公司 | Converter feeding method for smelting extremely-low-sulfur steel at low cost |
| CN115044741A (en) * | 2022-06-16 | 2022-09-13 | 宝武集团鄂城钢铁有限公司 | Method for removing phosphorus from low-phosphorus steel double-slag in smelting of low-silicon high-phosphorus molten iron |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109423533A (en) * | 2017-08-25 | 2019-03-05 | 鞍钢股份有限公司 | A kind of full dose molten iron converter smelting control method |
| CN109423533B (en) * | 2017-08-25 | 2020-09-01 | 鞍钢股份有限公司 | Full molten iron converter smelting control method |
| CN110484679A (en) * | 2018-03-27 | 2019-11-22 | 上海梅山钢铁股份有限公司 | A kind of control method of the double slag meltings of converter |
| CN110423856B (en) * | 2019-07-03 | 2021-04-13 | 山东钢铁股份有限公司 | Low-temperature smelting method for dephosphorization and decarburization of low-silicon molten iron |
| CN110423856A (en) * | 2019-07-03 | 2019-11-08 | 山东钢铁股份有限公司 | A kind of smelting process of low temperature, hot metal containing low silicon dephosphorization catch carbon |
| CN112210638B (en) * | 2019-07-10 | 2022-03-11 | 山东钢铁股份有限公司 | Converter smelting method for medium and high silicon molten iron |
| CN112210638A (en) * | 2019-07-10 | 2021-01-12 | 山东钢铁股份有限公司 | Converter smelting method for medium and high silicon molten iron |
| CN110904300A (en) * | 2019-12-27 | 2020-03-24 | 安徽工业大学 | Efficient dephosphorization and furnace protection method for converter slag melting point control model |
| CN113201622A (en) * | 2021-05-13 | 2021-08-03 | 山东鲁丽钢铁有限公司 | Method for smelting high-quality carbon steel by 120t converter |
| CN113435037A (en) * | 2021-06-25 | 2021-09-24 | 马鞍山钢铁股份有限公司 | Method for judging slag pouring time in early stage of cast residue smelting of 300t converter |
| CN113435037B (en) * | 2021-06-25 | 2022-08-26 | 马鞍山钢铁股份有限公司 | Method for judging slag pouring time in early stage of cast residue smelting of 300t converter |
| CN114657314A (en) * | 2022-03-17 | 2022-06-24 | 山东钢铁集团日照有限公司 | Converter feeding method for smelting extremely-low-sulfur steel at low cost |
| CN115044741A (en) * | 2022-06-16 | 2022-09-13 | 宝武集团鄂城钢铁有限公司 | Method for removing phosphorus from low-phosphorus steel double-slag in smelting of low-silicon high-phosphorus molten iron |
| CN115044741B (en) * | 2022-06-16 | 2023-11-17 | 宝武集团鄂城钢铁有限公司 | Dephosphorization method for low-phosphorus steel double slag in low-silicon high-phosphorus molten iron smelting |
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