CN103866088B - Method for determining amount of slagging material and deoxidized alloy added into LF (Low-Frequency) refining furnace by use of reference heat method - Google Patents
Method for determining amount of slagging material and deoxidized alloy added into LF (Low-Frequency) refining furnace by use of reference heat method Download PDFInfo
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Abstract
The invention relates to a method for determining the amount of a slagging material and deoxidized alloy added into an LF refining furnace by use of a reference heat method. The method comprises the following steps: controlling the amount of slags discharged from a rotary furnace during a refining process, wherein the amount of the added synthetic slags is the same during a steel discharging process of the rotary furnace according to the same type of steel heat number; (1) acquiring data and building a database by use of a computer; and (2) using the database for determining the amount of the slagging material and the deoxidized alloy added into this type of steel LF refining furnace when the acquired data of a certain type of steel in the database is accumulated to be not less than 400 heat number. The method disclosed by the invention comprises steps of acquiring operation data, building the database and using the computer to process the data rapidly and accurately; the reference heat method absolutely can be used for replacing the existing slagging method for manually determining the amount of the added slagging material and has the advantages of solving the instability of manual determination, optimizing the refining effect, stabilizing the quality of refined liquid steel and promoting standardized operation.
Description
Technical field
The present invention relates to a kind of method utilizing reference heats method to determine LF refining furnace slag material and deoxygenated alloy add-on, belong to the LF refining techniques field in steelmaking process.
Background technology
The main task of LF refining process has deoxidation, desulfurization, removal are mingled with and adjust molten steel temperature, chemical composition.LF stove is with the refining function of its uniqueness, good refining effect, simple operation technique play an important role in smelting process, it can carry out temperature adjustment process to molten steel, and energy long-time heat preservation molten steel, coordinate the rhythm of production between continuous casting installation for casting and steel melting furnace, improve steel product quality, expanding production kind, LF refining furnace becomes the production of guarantee continuous casting can the indispensable equipment of direct motion.In LF refining process the quality of refining effect and the consumption of refining slag inseparable.
CN101403021A discloses a kind of utilization method for steel scoria, it adds slag material slag making at LF ladle refining furnace and carries out refining, molten steel per ton adds slag material 20KG ~ 50KG/T, in the flow process of then casting, ladle furnace slag after casting and residue molten steel are returned in electric furnace and smelts, and add slag material in electric furnace, molten steel per ton adds slag material 50KG ~ 70KG/T, reduce the add-on of slag material lime in electrosmelting process, and reduce the delivery of electric furnace.
At present, steelworks refining plant slagging process mainly workman rule of thumb determine add-on and the feed postition of slag material.Namely, the dissolved oxygen content in molten steel is surveyed with Determining oxygen probe, observe slag color and viscosity, using these as judgment basis, then the add-on of slag material is rule of thumb determined, uneven due to human users's level, thus cause the compositional ranges fluctuation of refining slag comparatively large, what be difficult to avoid causes partially rare, the resistance to material of indivedual heat slag to corrode serious, casting process to occur the problems such as nozzle clogging, inclusion content of steel be unstable.Because slag composition in refining process cannot on-line monitoring, accurately can not provide the slag composition that enters the station of LF refining furnace, this gives with bringing very large technical difficulty adding of control with computational intelligence LF refining furnace slag material.In refining process, slag composition mainly contains: CaO, SiO
2, Al
2o
3, FeO, MnO, for CaO, SiO wherein
2, Al
2o
3, CaO, SiO of controlling identical steel grade in the quantity of slag under converter, converter tapping process and having the method for identical synthetic slag add-on to carry out stable LF to enter the station in slag can be utilized
2, Al
2o
3content.And the content of FeO, MnO wherein controls to there is no effective method at present.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of method utilizing reference heats method to determine LF refining furnace slag material and deoxygenated alloy add-on, be applicable to al-killed class steel grade, realize standardized work.
Terminological interpretation: al-killed steel grade, namely converter tapping process and LF refining process aluminium carry out the steel grade of deoxidation.
In formula of the present invention, all multiplication signs all represent with " * ", to avoid obscuring with English alphabet.
Technical scheme of the present invention is as follows:
Utilize reference heats method to determine a method for LF refining furnace slag material and deoxygenated alloy add-on, comprise in refining process and control the quantity of slag under converter, identical with the synthetic slag add-on of steel grade heat in converter tapping process; Step is as follows:
(1) gather following data, utilize computer building database:
A: the steel grade number of smelting;
B: heat (batch) number;
C: Metal Weight, unit ton; Be designated as C;
D: the dissolved oxygen in converter smelting endpoint molten steel, unit ppm; Be designated as D;
E: the aluminium-containing alloy add-on in converter tapping process, units/kg, is designated as E;
E
1: the add-on of aluminium in converter tapping process, units/kg, is designated as E
1, E
1for the aluminum content sum of aluminium alloy added, calculation formula is: E
1the mass percent of the aluminium in=Σ E* aluminium alloy;
F: calculate remaining aluminium content after having taken off steel oxygen in water in tapping process, units/kg, is designated as F,
Calculation formula is: F=E
1-C*D*1.125*0.001;
G:LF refining furnace enters the station the mass percentage of dissolved aluminum in molten steel, %;
H:LF refining furnace enters the station the dissolved oxygen in molten steel, unit ppm;
I:LF refining furnace enters the station liquid steel temperature, DEG C;
G:LF refining furnace adds aluminum amount, units/kg;
K:LF refining furnace lime adding amount, units/kg;
L:LF refining furnace carbide of calcium add-on, units/kg;
The mass percentage of the dissolved aluminum in m:LF refining furnace departures molten steel, %.
N:LF refining furnace fluorite add-on, units/kg;
(2) when the image data of certain steel grade in database be accumulate to >=400 heat time, namely this database can be used for the determination of this steel grade LF refining furnace slag material and deoxygenated alloy add-on, and method is as follows:
After ladle is transported into LF refining furnace, gather molten steel steel grade number, the dissolved oxygen (ppm) in converter smelting endpoint molten steel, the aluminium-containing alloy add-on (kg) in converter tapping process, by formula F=E
1-C*D*1.125*0.001 is remaining aluminium content (kg) after calculating in tapping process and having taken off steel oxygen in water, utilizes Determining oxygen probe to measure the mass percentage (%) of dissolved oxygen content (ppm) in molten steel and dissolved aluminum simultaneously;
Then open database, search can meet simultaneously take off steel oxygen in water in dissolved oxygen (ppm) in steel grade number, converter smelting endpoint molten steel, tapping process after remaining aluminium content (kg), the mass percentage (%) of dissolved aluminum and the heat of data deviation within ± 15% of this stove molten steel;
By meet above-mentioned condition all heats in LF refining furnace adds aluminum amount (kg), LF refining furnace lime adding amount (kg), LF refining furnace fluorite add-on (kg), LF refining furnace carbide of calcium add-on (kg) gets arithmetic average, obtain the LF refining furnace slag material of this heat and the feeding quantity of deoxygenated alloy.
Wherein, lime and fluorite belong to LF refining furnace slag material, carbide of calcium and aluminium belong to deoxygenated alloy, and the present invention, by reference to heat method determination lime and the dosage of fluorite carbon and the dosage of carbide of calcium and aluminium, namely achieves the determination of LF refining furnace slag material and deoxygenated alloy add-on.
According to the present invention, the aluminium-containing alloy described in step (1) e. is one of aluminium ferromanganese, aluminium manganese titanium, steel-core-aluminium or combination.For improving deoxidation effect, generally carry out deoxidation with the alloy of deoxidant element and iron or manganese in converter tapping process, such as aluminium ferromanganese, aluminium manganese titanium are about containing aluminium 55%, and steel-core-aluminium is containing aluminium 50%.
If quality problems do not appear in this stove molten steel after refining completes, then the service data of this stove continues input database.
When the image data of certain steel grade of lane database be accumulate to >=400 heat time, the data volume of database purchase substantially just can meet and instructs refining production requirement.Certainly, data accumulation heat is collected The more the better.
Technical characterstic of the present invention and principle: in refining process, slag composition mainly contains: CaO, SiO
2, Al
2o
3, FeO, MnO, for CaO, SiO
2, Al
2o
3, CaO, SiO of utilizing the method controlling " identical steel grade has identical synthetic slag add-on " in the quantity of slag under converter, converter tapping process to carry out stable LF to enter the station in slag
2, Al
2o
3content; For FeO and MnO, LF enters the station the content of FeO, MnO in slag to adopt reference heats method to determine.
For aluminium-deoxidized steel grade, the correlated response formula in de-slag is as follows:
3FeO+2Al=3Fe+Al
2O
3.......................①
3MnO+2Al=3Mn+Al
2O
3..................②
1., 2. can find out that from reaction formula the variable quantity of aluminium content molten steel and pace of change are relevant with the content of FeO+MnO in slag, can characterize the content of FeO+MnO in slag by the changing conditions of the aluminium in molten steel.This is utilize reference heats method to determine that the method for LF refining furnace slag material and deoxygenated alloy add-on provides scientific basis, add in the early stage of two stove molten steel that to make doses identical and under the condition that aluminium content within the identical time period is identical with the variable quantity of aluminium, in this two stoves molten steel slag, the content of FeO is also identical, and add-on, the slag material add-on of the reductor in later stage are also identical.The invention provides a kind of method utilizing reference heats method to determine LF refining furnace slag material and deoxygenated alloy add-on, determine that aluminium-deoxidized steel grade LF enters the station the content of FeO, MnO in slag.
Excellent results of the present invention:
The present invention determines the method for LF refining furnace slag material and deoxygenated alloy add-on by reference to heat method, by acquisition operations data, building database, with computer processing data quick and precisely, the complete alternative slag making mode determining slag material add-on at present with artificial experience, solve the unstable of manual operation, judgement, thus realize optimizing refining effect, stablizing refined molten steel quality, Promoting Standardized operation.
Embodiment
Below for steel grade number be SPHC Database and Application Example, the present invention is further described.
Utilize reference heats method to determine a method for LF refining furnace slag material and deoxygenated alloy add-on, comprise in refining process and control the quantity of slag under converter, the synthetic slag add-on of steel grade SPHC in the converter tapping process of 400 heats is identical; Step is as follows:
(1) gather following data, utilize computer building database:
A: the steel grade number of smelting: SPHC;
B: heat (batch) number; 400 heats accumulated by SPHC steel grade, input heat numbering respectively;
Below that the information data of each heat gathers respectively:
C: Metal Weight, unit ton; Be designated as C;
D: the dissolved oxygen in converter smelting endpoint molten steel, unit ppm; Be designated as D;
E: the aluminium-containing alloy add-on in converter tapping process, units/kg, is designated as E; This alloy is aluminium ferromanganese;
E
1: the add-on of aluminium in converter tapping process, units/kg, is designated as E
1, data E
1for the aluminum content sum of ferroaluminium added, calculation formula is: E
1the mass percent of the aluminium in=E* ferroaluminium;
F: calculate remaining aluminium content after having taken off steel oxygen in water in tapping process, units/kg, is designated as F; Calculation formula is: F=E
1-C*D*1.125*0.001;
G:LF refining furnace enters the station the mass percentage of dissolved aluminum in molten steel, %;
H:LF refining furnace enters the station the dissolved oxygen in molten steel, unit ppm;
I:LF refining furnace enters the station liquid steel temperature, DEG C;
G:LF refining furnace adds aluminum amount, units/kg;
K:LF refining furnace lime adding amount, units/kg;
L:LF refining furnace carbide of calcium add-on, units/kg;
The mass percentage of the dissolved aluminum in m:LF refining furnace departures molten steel, %.
N:LF refining furnace fluorite add-on, units/kg;
(2) when the image data of certain steel grade in database be accumulate to >=400 heat time, namely this database can be used for the determination of this steel grade LF refining furnace slag material and deoxygenated alloy add-on, and method is as follows:
After ladle is transported into LF refining furnace, gather molten steel steel grade number, the dissolved oxygen (ppm) in converter smelting endpoint molten steel, the aluminium-containing alloy add-on (kg) in converter tapping process, by formula: F=E
1-C*D*1.125*0.001 is remaining aluminium content (kg) after calculating in tapping process and having taken off steel oxygen in water, utilizes Determining oxygen probe to measure the mass percentage (%) of dissolved oxygen content (ppm) in molten steel and dissolved aluminum simultaneously, then database is opened, search can meet steel grade number simultaneously, dissolved oxygen (ppm) in converter smelting endpoint molten steel, remaining aluminium content (kg) after having taken off steel oxygen in water in tapping process, the mass percentage (%) of dissolved aluminum and the heat of data deviation within ± 15% of this stove molten steel, by meet above-mentioned condition all heats in LF refining furnace add aluminum amount (kg), LF refining furnace lime adding amount (kg), LF refining furnace fluorite add-on (kg), LF refining furnace carbide of calcium add-on (kg) gets arithmetic average, obtain the LF refining furnace slag material of this heat and the feeding quantity of deoxygenated alloy.
Percentage composition % in following examples is mass percent.
Embodiment 1:
After heat (batch) number 2-4479 ladle is transported into LF refining furnace, image data: steel grade number is SPHC, dissolved oxygen in converter smelting endpoint molten steel is 883ppm, molten steel weighs 130.9 tons, the add-on 400kg of aluminium ferromanganese in converter tapping process, containing aluminium 55% in aluminium ferromanganese, F=400*55%-130.9*883*1.125*0.001 obtains as calculated: remaining aluminium content 90.0kg after having taken off steel oxygen in water in tapping process.
Determining oxygen probe is utilized to survey the dissolved oxygen content 8(ppm that enters the station in molten steel of LF) and the mass percentage 0.005(% of dissolved aluminum), behind calling data storehouse, search out the suitable molten steel of 2 stove of heat (batch) number 3-3683 and heat (batch) number 3-8311 as reference heat, dissolved oxygen (ppm) in the converter smelting endpoint molten steel of this two stoves steel, remaining aluminium content (kg) after having taken off steel oxygen in water in tapping process, the while of the data deviation that the mass percentage (%) that LF enters the station molten steel dissolved aluminum gathers with this stove molten steel within ± 15%, aluminum amount (kg) is added to the LF refining furnace of this two stoves steel, LF refining furnace lime adding amount (kg), LF refining furnace carbide of calcium add-on (kg) gets arithmetic average: LF refining furnace carbide of calcium 105kg, LF refining furnace adds aluminum amount 87.5kg, LF refining furnace adds amount of lime: 500kg.
Add carbide of calcium 105kg, aluminium 87.5kg, lime 500kg in the molten steel LF refining process of heat (batch) number 2-4479, after refining completes, steel quality is qualified in batches.
Table 1: embodiment 1 and reference heat charge data
Embodiment 2:
After heat (batch) number 3-8218 ladle is transported into LF refining furnace, image data: steel grade number is SPHC, dissolved oxygen in converter smelting endpoint molten steel is 528ppm, molten steel weighs 133.6 tons, the add-on 450kg of aluminium ferromanganese in converter tapping process, containing aluminium 55% in aluminium ferromanganese, (450*55%-133.6*528*1.125*0.001) obtains as calculated: remaining aluminium content 168.1kg after having taken off steel oxygen in water in tapping process, utilize Determining oxygen probe to survey LF to enter the station the mass percentage 0.005(% of dissolved oxygen content 10ppm in molten steel and dissolved aluminum), behind calling data storehouse, search out the 2 stove steel of heat (batch) number 3-8328 and heat (batch) number 3-8327 as reference heat, dissolved oxygen (ppm) in the converter smelting endpoint molten steel of this two stoves steel, remaining aluminium content (kg) after having taken off steel oxygen in water in tapping process, the while of the data deviation that the mass percentage (%) that LF enters the station molten steel dissolved aluminum gathers with this stove molten steel within ± 15%, aluminum amount (kg) is added to the LF refining furnace of this two stoves steel, LF refining furnace lime adding amount (kg), LF refining furnace carbide of calcium add-on (kg) gets arithmetic average: LF refining furnace carbide of calcium 90kg, LF refining furnace adds aluminum amount 113.75kg, LF refining furnace adds amount of lime: 975kg.Add carbide of calcium 90kg, aluminium 113.75kg, lime 975kg in the molten steel LF refining process of heat (batch) number 3-8218, after refining completes, steel quality is qualified in batches.
Table 2: embodiment 2 and reference heat charge data
Claims (2)
1. utilize reference heats method to determine a method for LF refining furnace slag material and deoxygenated alloy add-on, comprise in refining process and control the quantity of slag under converter, identical with the synthetic slag add-on of steel grade heat in converter tapping process; Step is as follows:
(1) gather following data, utilize computer building database:
A: the steel grade number of smelting;
B: heat (batch) number;
C: Metal Weight, unit ton; Be designated as C;
D: the dissolved oxygen in converter smelting endpoint molten steel, unit ppm; Be designated as D;
E: the aluminium-containing alloy add-on in converter tapping process, units/kg, is designated as E;
E
1: the add-on of aluminium in converter tapping process, units/kg, is designated as E
1, E
1for the aluminum content sum of aluminium alloy added, calculation formula is: E
1the mass percent of the aluminium in=Σ E * aluminium alloy;
F: calculate remaining aluminium content after having taken off steel oxygen in water in tapping process, units/kg, is designated as F,
Calculation formula is: F=E
1-C*D*1.125*0.001;
G:LF refining furnace enters the station the mass percentage of dissolved aluminum in molten steel, %;
H:LF refining furnace enters the station the dissolved oxygen in molten steel, unit ppm;
I:LF refining furnace enters the station liquid steel temperature, DEG C;
G:LF refining furnace adds aluminum amount, units/kg;
K:LF refining furnace lime adding amount, units/kg;
L:LF refining furnace carbide of calcium add-on, units/kg;
The mass percentage of the dissolved aluminum in m:LF refining furnace departures molten steel, %;
N:LF refining furnace fluorite add-on, units/kg;
(2) when the image data of certain steel grade in database be accumulate to >=400 heat time, namely this database can be used for the determination of this steel grade LF refining furnace slag material and deoxygenated alloy add-on, and method is as follows:
After ladle is transported into LF refining furnace, gather molten steel steel grade number, the dissolved oxygen in converter smelting endpoint molten steel, unit ppm, the aluminium-containing alloy add-on in converter tapping process, units/kg, by formula F=E
1-C*D*1.125*0.001 is remaining aluminium content after calculating in tapping process and having taken off steel oxygen in water, units/kg, utilizes the dissolved oxygen content in Determining oxygen probe mensuration molten steel, unit ppm, and the mass percentage of dissolved aluminum, % simultaneously;
Then open database, search can meet the dissolved oxygen in steel grade number, converter smelting endpoint molten steel simultaneously, unit ppm, remaining aluminium content after having taken off steel oxygen in water in tapping process, units/kg, the heat of data deviation within ± 15% of the mass percentage of dissolved aluminum and this stove molten steel
By meet above-mentioned condition all heats in LF refining furnace add aluminum amount, units/kg, LF refining furnace lime adding amount, units/kg, LF refining furnace fluorite add-on, units/kg, LF refining furnace carbide of calcium add-on, units/kg, gets arithmetic average, obtains the LF refining furnace slag material of this heat and the feeding quantity of deoxygenated alloy.
2. determine the method for LF refining furnace slag material and deoxygenated alloy add-on as claimed in claim 1, it is characterized in that the aluminium-containing alloy described in step (1) e. is one of aluminium ferromanganese, aluminium manganese titanium, steel-core-aluminium or combination.
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| CN105838846A (en) * | 2016-05-19 | 2016-08-10 | 山东钢铁股份有限公司 | Method for controlling basicity of LF refining slag |
| CN106244827B (en) * | 2016-09-05 | 2018-06-19 | 重庆大学 | A kind of smelting endpoint of smelting titanium slag with electric stove judges system and method |
| CN106755734B (en) * | 2016-12-14 | 2018-08-14 | 山东钢铁股份有限公司 | A kind of deoxidation slagging method of LF refining furnace |
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| CN110607415A (en) * | 2019-09-23 | 2019-12-24 | 柳州钢铁股份有限公司 | Method for measuring slag discharge amount of converter by using low-silicon aluminum killed steel |
| CN112322842B (en) * | 2020-11-02 | 2021-07-06 | 福建三宝钢铁有限公司 | External refining slagging process |
| CN112560218B (en) * | 2020-11-10 | 2021-09-03 | 北京科技大学 | LF refining slagging lime addition amount prediction method and system and LF refining method |
| CN113430333B (en) * | 2021-07-13 | 2022-04-12 | 北京科技大学 | Intelligent stable smelting control method for ladle refining furnace |
| CN115896397B (en) * | 2023-01-09 | 2023-12-26 | 湖南华联云创信息科技有限公司 | LF refining intelligent slag system control method and system |
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