CN103866088A - 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 of determining LF refining furnace slag material and deoxygenated alloy add-on with reference to heat method of utilizing, belong to the LF refining techniques field in steelmaking process.
Background technology
The main task of LF refining process has deoxidation, desulfurization, removal to be mingled with and adjusts molten steel temperature, chemical composition.LF stove is with its unique refining function, good refining effect, simple operation technique play an important role in smelting process, it can carry out temperature adjustment processing to molten steel, and can be incubated for a long time 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 assurance continuous casting can the indispensable equipment of direct motion.In LF refining process, the quality of refining effect and the consumption of refining slag are inseparable.
CN101403021A discloses a kind of utilization method for steel scoria, it is to add slag material slag making and carry out refining at LF ladle refining furnace, molten steel per ton adds slag material 20KG～50KG/T, then in the flow process of casting, ladle furnace slag after casting and residue molten steel are returned in electric furnace and smelted, and add slag material in electric furnace, molten steel per ton adds slag material 50KG～70KG/T, in electrosmelting process, reduce the add-on of slag material lime, and reduce the delivery of electric furnace.
At present, steelworks refining plant slagging process is mainly that workman rule of thumb determines the add-on of slag material and adds mode.; with the dissolved oxygen content in Determining oxygen probe survey molten steel; observe slag color and viscosity; using these as judgment basis; then rule of thumb determine the add-on of slag material; uneven due to personnel's operant level, thus cause the composition scope fluctuation of refining slag larger, and what be difficult to avoid causes partially rare, the resistance to material of indivedual heat slags to corrode serious, casting process to occur the problems such as nozzle clogging, inclusion content of steel be unstable.Cannot on-line monitoring due to slag composition in refining process, can not accurately 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, can utilize and control identical steel grade in the quantity of slag under converter, converter tapping process and have the method for identical synthetic slag add-on to stablize CaO, SiO that LF enters the station in slag
2, Al
2o
3content.And the content control of FeO, MnO wherein 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 of determining LF refining furnace slag material and deoxygenated alloy add-on with reference to heat method of utilizing, be applicable to al-killed class steel grade, realize standardized work.
Terminological interpretation: al-killed steel grade, converter tapping process and LF refining process carry out the steel grade of deoxidation with aluminium.
In formula of the present invention, all multiplication signs all represent with " * ", obscure avoiding with English alphabet.
Technical scheme of the present invention is as follows:
Utilize a method of determining LF refining furnace slag material and deoxygenated alloy add-on with reference to heat method, comprise in refining process and control the quantity of slag under converter, the synthetic slag add-on with steel grade heat in converter tapping process is identical; 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, the ppm of unit; 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 the aluminium alloy that adds, calculation formula is: E
1the mass percent of the aluminium in=Σ E* aluminium alloy;
F: calculate and taken off remaining aluminium content after 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;
The enter the station quality percentage composition of acid-soluble aluminium in molten steel of g:LF refining furnace, %;
The h:LF refining furnace dissolved oxygen in molten steel that enters the station, the ppm of unit;
The i:LF refining furnace liquid steel temperature that enters the station, ℃;
G:LF refining furnace adds aluminium amount, units/kg;
K:LF refining furnace lime adding amount, units/kg;
L:LF refining furnace carbide of calcium add-on, units/kg;
The quality percentage composition of the acid-soluble aluminium in m:LF refining furnace departures molten steel, %.
N:LF refining furnace fluorite add-on, units/kg;
(2) in the time of be accumulate to >=400 heat of the image data of certain steel grade in database, this database can be used for determining of this steel grade LF refining furnace slag material and deoxygenated alloy add-on, and method is as follows:
Ladle is transported into after LF refining furnace, gather molten steel steel grade number, converter smelting endpoint molten steel in dissolved oxygen (ppm), the aluminium-containing alloy add-on (kg) in converter tapping process, by formula F=E
1-C*D*1.125*0.001 calculates and in tapping process, has taken off remaining aluminium content (kg) after steel oxygen in water, utilizes Determining oxygen probe to measure dissolved oxygen content (ppm) in molten steel and the quality percentage composition (%) of acid-soluble aluminium simultaneously;
Then open database, search can meet simultaneously and in dissolved oxygen (ppm) in steel grade number, converter smelting endpoint molten steel, tapping process, taken off remaining aluminium content (kg) after steel oxygen in water, the quality percentage composition (%) of acid-soluble aluminium and the heat of the data deviation of this stove molten steel in ± 15%;
By meet above-mentioned condition all heats in LF refining furnace add aluminium 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) and get arithmetic mean value, 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 determines the dosage of lime and fluorite carbon and the dosage of carbide of calcium and aluminium by reference to heat method, have realized determining 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, in converter tapping process, generally carry out deoxidation with the alloy of deoxidant element and iron or manganese, for example aluminium ferromanganese, aluminium manganese titanium are approximately 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, the service data of this stove continues input database.
In the time of be accumulate to >=400 heat of the image data of certain steel grade of lane database, the data volume of database storage substantially just can meet and instruct refining production requirement.Certainly, collection data accumulation heat is 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, under utilization control converter, in the quantity of slag, converter tapping process, the method for " identical steel grade has identical synthetic slag add-on " is stablized CaO, the SiO that LF enters the station in slag
2, Al
2o
3content; For FeO and MnO, adopt with reference to heat method and determine LF the enter the station FeO in slag, the content of MnO.
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
From reaction formula 1., 2. can find out that the variable quantity of aluminium content molten steel is relevant with the content of FeO+MnO in slag with pace of change, can characterize by the changing conditions of the aluminium in molten steel the content of FeO+MnO in slag.This determines that with reference to heat method the method for LF refining furnace slag material and deoxygenated alloy add-on provides scientific basis for utilizing, add and make under the condition that material amount variable quantity identical and aluminium content within the identical time period and aluminium is identical in the early stage of two stove molten steel, 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 of determining LF refining furnace slag material and deoxygenated alloy add-on with reference to heat method of utilizing, determine aluminium-deoxidized steel grade LF the enter the station FeO in slag, the content of MnO.
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 completely alternative slag making mode that determines at present slag material add-on with artificial experience, solve the unstable of manual operation, judgement, thereby realization is optimized refining effect, is stablized refined molten steel quality, Promoting Standardized operation.
Embodiment
Database take steel grade number as SPHC and Application Example are as example below, and the present invention is further described.
Utilize a method of determining LF refining furnace slag material and deoxygenated alloy add-on with reference to heat method, 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; SPHC steel grade is accumulated 400 heats, inputs respectively heat numbering;
The information data that is below each heat gathers respectively:
C: Metal Weight, unit ton; Be designated as C;
D: the dissolved oxygen in converter smelting endpoint molten steel, the ppm of unit; 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 the ferroaluminium that adds, calculation formula is: E
1the mass percent of the aluminium in=E* ferroaluminium;
F: calculate and taken off remaining aluminium content after 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;
The enter the station quality percentage composition of acid-soluble aluminium in molten steel of g:LF refining furnace, %;
The h:LF refining furnace dissolved oxygen in molten steel that enters the station, the ppm of unit;
The i:LF refining furnace liquid steel temperature that enters the station, ℃;
G:LF refining furnace adds aluminium amount, units/kg;
K:LF refining furnace lime adding amount, units/kg;
L:LF refining furnace carbide of calcium add-on, units/kg;
The quality percentage composition of the acid-soluble aluminium in m:LF refining furnace departures molten steel, %.
N:LF refining furnace fluorite add-on, units/kg;
(2) in the time of be accumulate to >=400 heat of the image data of certain steel grade in database, this database can be used for determining of this steel grade LF refining furnace slag material and deoxygenated alloy add-on, and method is as follows:
Ladle is transported into after LF refining furnace, gather molten steel steel grade number, converter smelting endpoint molten steel in dissolved oxygen (ppm), the aluminium-containing alloy add-on (kg) in converter tapping process, by formula: F=E
1-C*D*1.125*0.001 calculates and in tapping process, has taken off remaining aluminium content (kg) after steel oxygen in water, utilizes Determining oxygen probe to measure dissolved oxygen content (ppm) in molten steel and the quality percentage composition (%) of acid-soluble aluminium simultaneously, then open database, search can meet steel grade number simultaneously, dissolved oxygen (ppm) in converter smelting endpoint molten steel, in tapping process, take off remaining aluminium content (kg) after steel oxygen in water, the quality percentage composition (%) of acid-soluble aluminium and the heat of the data deviation of this stove molten steel in ± 15%, by meet above-mentioned condition all heats in LF refining furnace add aluminium 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) is got arithmetic mean value, 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:
Heat (batch) number 2-4479 ladle is transported into after LF refining furnace, image data: steel grade number for the dissolved oxygen in SPHC, converter smelting endpoint molten steel be the add-on 400kg that 883ppm, molten steel weigh aluminium ferromanganese in 130.9 tons, converter tapping process, in aluminium ferromanganese, containing aluminium 55%, F=400*55%-130.9*883*1.125*0.001 obtains as calculated: in tapping process, taken off remaining aluminium content 90.0kg after steel oxygen in water.
Utilize Determining oxygen probe to survey the dissolved oxygen content 8(ppm that enters the station in molten steel of LF) and the quality percentage composition 0.005(% of acid-soluble aluminium), behind calling data storehouse, the suitable molten steel of 2 stove that searches out heat (batch) number 3-3683 and heat (batch) number 3-8311 is as with reference to heat, dissolved oxygen (ppm) in the converter smelting endpoint molten steel of this two stoves steel, in tapping process, take off remaining aluminium content (kg) after steel oxygen in water, LF enters the station data deviation that quality percentage composition (%) and this stove molten steel of the acid-soluble aluminium of molten steel gather simultaneously in ± 15%, the LF refining furnace of this two stoves steel is added to aluminium amount (kg), LF refining furnace lime adding amount (kg), LF refining furnace carbide of calcium add-on (kg) is got arithmetic mean value: LF refining furnace carbide of calcium 105kg, LF refining furnace adds aluminium amount 87.5kg, LF refining furnace adds amount of lime: 500kg.
In the molten steel LF refining process of heat (batch) number 2-4479, add carbide of calcium 105kg, aluminium 87.5kg, lime 500kg, after refining completes, steel quality is qualified in batches.
Table 1: embodiment 1 and with reference to the reinforced data of heat
Embodiment 2:
Heat (batch) number 3-8218 ladle is transported into after LF refining furnace, image data: steel grade number for the dissolved oxygen in SPHC, converter smelting endpoint molten steel be the add-on 450kg that 528ppm, molten steel weigh aluminium ferromanganese in 133.6 tons, converter tapping process, in aluminium ferromanganese containing aluminium 55%, (450*55%-133.6*528*1.125*0.001) as calculated: taken off remaining aluminium content 168.1kg after steel oxygen in water in tapping process, utilize Determining oxygen probe to survey LF enter the station dissolved oxygen content 10ppm in molten steel and the quality percentage composition 0.005(% of acid-soluble aluminium), behind calling data storehouse, the 2 stove steel that search out heat (batch) number 3-8328 and heat (batch) number 3-8327 are as with reference to heat, dissolved oxygen (ppm) in the converter smelting endpoint molten steel of this two stoves steel, in tapping process, take off remaining aluminium content (kg) after steel oxygen in water, LF enters the station data deviation that quality percentage composition (%) and this stove molten steel of the acid-soluble aluminium of molten steel gather simultaneously in ± 15%, the LF refining furnace of this two stoves steel is added to aluminium amount (kg), LF refining furnace lime adding amount (kg), LF refining furnace carbide of calcium add-on (kg) is got arithmetic mean value: LF refining furnace carbide of calcium 90kg, LF refining furnace adds aluminium amount 113.75kg, LF refining furnace adds amount of lime: 975kg.In the molten steel LF refining process of heat (batch) number 3-8218, add carbide of calcium 90kg, aluminium 113.75kg, lime 975kg, after refining completes, steel quality is qualified in batches.
Table 2: embodiment 2 and with reference to the reinforced data of heat
Claims (2)
1. utilize a method of determining LF refining furnace slag material and deoxygenated alloy add-on with reference to heat method, comprise in refining process and control the quantity of slag under converter, the synthetic slag add-on with steel grade heat in converter tapping process is identical; 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, the ppm of unit; 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 the aluminium alloy that adds, calculation formula is: E
1the mass percent of the aluminium in=Σ E* aluminium alloy;
F: calculate and taken off remaining aluminium content after 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;
The enter the station quality percentage composition of acid-soluble aluminium in molten steel of g:LF refining furnace, %;
The h:LF refining furnace dissolved oxygen in molten steel that enters the station, the ppm of unit;
The i:LF refining furnace liquid steel temperature that enters the station, ℃;
G:LF refining furnace adds aluminium amount, units/kg;
K:LF refining furnace lime adding amount, units/kg;
L:LF refining furnace carbide of calcium add-on, units/kg;
The quality percentage composition of the acid-soluble aluminium in m:LF refining furnace departures molten steel, %.
N:LF refining furnace fluorite add-on, units/kg;
(2) in the time of be accumulate to >=400 heat of the image data of certain steel grade in database, this database can be used for determining of this steel grade LF refining furnace slag material and deoxygenated alloy add-on, and method is as follows:
Ladle is transported into after LF refining furnace, gather molten steel steel grade number, converter smelting endpoint molten steel in dissolved oxygen (ppm), the aluminium-containing alloy add-on (kg) in converter tapping process, by formula F=E
1-C*D*1.125*0.001 calculates and in tapping process, has taken off remaining aluminium content (kg) after steel oxygen in water, utilizes Determining oxygen probe to measure dissolved oxygen content (ppm) in molten steel and the quality percentage composition (%) of acid-soluble aluminium simultaneously;
Then open database, search can meet simultaneously and in dissolved oxygen (ppm) in steel grade number, converter smelting endpoint molten steel, tapping process, taken off remaining aluminium content (kg) after steel oxygen in water, the quality percentage composition (%) of acid-soluble aluminium and the heat of the data deviation of this stove molten steel in ± 15%
By meet above-mentioned condition all heats in LF refining furnace add aluminium 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) and get arithmetic mean value, obtain the LF refining furnace slag material of this heat and the feeding quantity of deoxygenated alloy.
2. the method for definite LF refining furnace slag material as claimed in claim 1 and deoxygenated alloy add-on, 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 |
| CN106244827A (en) * | 2016-09-05 | 2016-12-21 | 重庆大学 | The smelting endpoint of a kind of smelting titanium slag with electric stove judges system and method |
| CN106755734A (en) * | 2016-12-14 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of deoxidation slagging method of LF refining furnace |
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| CN106244827A (en) * | 2016-09-05 | 2016-12-21 | 重庆大学 | The smelting endpoint of a kind of smelting titanium slag with electric stove judges system and method |
| 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 |
| CN106755734A (en) * | 2016-12-14 | 2017-05-31 | 山东钢铁股份有限公司 | A kind of deoxidation slagging method of LF refining furnace |
| 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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| CN106834593B (en) * | 2017-02-13 | 2019-03-12 | 山东钢铁股份有限公司 | A method of RH refining furnace decarbonization process data are determined with reference heats method |
| CN110438295A (en) * | 2019-08-22 | 2019-11-12 | 厦门邑通软件科技有限公司 | A kind of method that wisdom promotes ladle refining furnace efficiency |
| 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 |
| CN112322842A (en) * | 2020-11-02 | 2021-02-05 | 福建三宝钢铁有限公司 | External refining slagging process |
| CN112560218A (en) * | 2020-11-10 | 2021-03-26 | 北京科技大学 | LF refining slagging lime addition amount prediction method and system and LF refining method |
| US11326217B1 (en) | 2020-11-10 | 2022-05-10 | University Of Science And Technology Beijing | Method and system for predicting addition amount of slagging lime during LF refining, and LF refining method |
| CN113430333A (en) * | 2021-07-13 | 2021-09-24 | 北京科技大学 | Intelligent stable smelting control method for ladle refining furnace |
| CN113430333B (en) * | 2021-07-13 | 2022-04-12 | 北京科技大学 | Intelligent stable smelting control method for ladle refining furnace |
| CN115896397A (en) * | 2023-01-09 | 2023-04-04 | 湖南华联云创信息科技有限公司 | LF refining intelligent slag system control method and system |
| 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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