CN106755734B - A kind of deoxidation slagging method of LF refining furnace - Google Patents

A kind of deoxidation slagging method of LF refining furnace Download PDF

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Publication number
CN106755734B
CN106755734B CN201611152152.9A CN201611152152A CN106755734B CN 106755734 B CN106755734 B CN 106755734B CN 201611152152 A CN201611152152 A CN 201611152152A CN 106755734 B CN106755734 B CN 106755734B
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slag
al2o3
feo
station
aluminum
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CN106755734A (en
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刘洪银
倪培亮
王永刚
孙建卫
郝帅
路峰
袁鹏举
亓伟伟
王奉县
王孝科
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Laiwu Steel Group Yinshan Section Steel Co Ltd
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Shandong Iron and Steel Group Co Ltd SISG
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006Adding metallic additives
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0087Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C2300/00Process aspects
    • C21C2300/06Modeling of the process, e.g. for control purposes; CII
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

The invention discloses a kind of deoxidation slagging methods of LF refining furnace, the described method comprises the following steps:Establish LF refining furnace slagging model, slagging model reads converter data online, and acid-soluble aluminum content calculates the primary condition that enter the station such as the oxidisability, the quantity of slag, composition of the clinker that enters the station in the molten steel detected constantly that entered the station according to charge data, the LF stove ladles in converter smelting data, converter tapping process;Deoxidier addition is determined according to the oxidisability in the clinker that enters the station;The addition quantity of slag material is determined according to target slag system composition and the slag composition that enters the station.

Description

A kind of deoxidation slagging method of LF refining furnace
Technical field
The invention belongs to technical field of ferrous metallurgy, in particular it relates to a kind of deoxidation slag making side of LF refining furnace Method.
Background technology
The slagging process in country LF refining furnace workshop is mainly that field worker is made according to the knowhow of oneself decision at present The addition and feed postition of slag charge, can be according to so as to cause individual heat clinkers, partially dilute, resistance to material is invaded without fixed operating instruction Erosion is serious, the appearance of the problems such as nozzle blocking, inclusion content of steel is unstable occurs in casting process.This kind of empirical formula essence at present Smelting method, which needs to refine worker, an abundant knowhow, and in refining process, refining worker needs frequently dip in slag with iron rod to observe Color, the mobility of clinker, and with this come determine refining slag material and deoxidier addition quantity.Worker is refined in flushing and casting When, high temperature, noise, dust before refining furnace cause prodigious actual bodily harm to refining worker, and working environment is very severe.It is domestic The LF refining furnace slagging model that forefathers develop needs refining worker rule of thumb to judge the feelings such as the quantity of slag under converter, slag beneficiation Then condition is manually entered into slagging model again, but since refining worker does not grasp the charging of converter smelting data and tapping process Data, and the primary condition that enters the station is difficult that the method observed by the naked eye observes, and leads to the primary condition standard that enters the station of input True property is relatively low.
Invention content
The object of the present invention is to provide a kind of deoxidation slagging methods of LF refining furnace, can be utilized and be calculated using this method Machine substitutes refining worker and goes slag making, plays stable refining slag system, reduces the consumption of slag material and deoxidier, and it is strong to reduce worker's labour The purpose of degree.
In order to achieve the above objectives, the technical solution adopted by the present invention is:LF refining furnace slagging model is established, slagging model exists Line reads converter data, enters the station and detects constantly according to charge data, the LF stove ladles in converter smelting data, converter tapping process Molten steel in acid-soluble aluminum content calculate oxidisability, the quantity of slag, composition of the clinker that enters the station etc. and enter the station primary condition;According to the clinker that enters the station In oxidisability determine deoxidier addition;The addition of slag material is determined according to target slag system composition and the slag composition that enters the station Quantity.
More specifically, a kind of deoxidation slagging method of LF refining furnace, the described method comprises the following steps:
1) in converter slag FeO percentage compositions calculating:
Oxygen concentration a in the molten steel detected in finishing blowing using revolving furnace sublance[O]To calculate FeO percentages in converter slag Content, specific calculating process are following process:
The oxidation reaction of converter molten steel is by the way that 1. formula is expressed as follows:A in FeO and molten steel in vessel slag[O]Equilibrium equation For:
[Fe]+[O]=(FeO) is 1.
The balanced type of the formula is represented by following 2. formula:
KFeO=aFeO/(a[Fe]×a[O]) ②
Due to a in converter molten steel[O]=1, KFeOFor fixed value, so ideally aFeOWith a[O]It is directly proportional, due to turning A in clinkerFeONumerical value is smaller, according to Raoult's law, is approximately considered FeO concentration in clinker and is equal to FeO activity.
Again to oxygen concentration a in converter molten steel[O]It is detected with corresponding vessel slag composition, to ωFeOWith a[O]Pass System carries out regression analysis, as follows 3. formula:
ωFeO=(5+ (a[O]/800)×18.2)×(72/56) ③
Formula 1. 2. 3. in KFeOFor the equilibrium constant of the oxidation reaction of iron, a[Fe]、a[O]For the activity of Fe in molten steel and oxygen, aFeOFor the activity of FeO in vessel slag, ωFeOFor the mass percentage (%) of FeO in vessel slag.
2) LF stoves enter the station the calculating of FeO contents in clinker:
The quantity of slag under converter is set as fixed value W in the parameter setting interface of slagging model in advanceSlag_ converters are set
A:For only adding the steel grade of aluminum deoxidier in converter tapping process, excessive aluminum is added in converter tapping process Deoxidier after ladle is hung in LF refining station, detects acid-soluble aluminum content in molten steel using Determining oxygen probe, is joined according to slagging model The quantity of slag under the converter of number interface settings, the decrement of aluminium element calculates in molten steel in this period of entering the station from converter tapping to LF LF enters the station FeO contents in clinker, as follows 4. formula;
WFeO=WSlag_ turns×(ωFeO/100)-(WAdd aluminium-tapping-WAluminium damages-take off dissolved oxygen-WDetection-LF enters the station)×(q1/100) ④
B:For adding aluminum deoxidier again in converter tapping process plus the steel grade of silicon class alloy, due to silicone content in molten steel Higher, the limiting element of deoxidation process is transmission of the oxygen to reaction interface in clinker, and deoxidation speed only has with FeO contents in clinker It closes, calculating LF with 2. formula enters the station FeO contents in clinker;
WFeO=WSlag_ turns×(ωFeO/100)×(1-q2/100) ⑤
Formula 4. 5. in WFeOFor FeO mass in the clinker that enters the station, (kg);WSlag_ turnsFor the quantity of slag under converter, (kg);WAdd aluminium-tappingTo turn The aluminum deoxidier quality being added in stove tapping process, (kg);WAluminium damages-take off dissolved oxygenTo take off the aluminum deoxidation of dissolved oxygen depletion in molten steel Agent quality, (kg);WDetection-LF enters the stationFor the dissolved aluminum quality detected that enters the station, (kg);q1The efficiency of oxygen in clinker is taken off for aluminium, (%), Rule of thumb data obtain;q2For the ratio that FeO in clinker in tapping process is removed, (%), rule of thumb data acquisition;With W in upper parameterSlag_ turns、q1、q2It need to be set in the parameter interface of slagging model.
3) quantity of slag W under converterSlag_ converters are setRevision:
It is entered the station slag composition by spectra methods detection every 2-5 stoves, and 4., 5. testing result is brought into formula carrys out counter push away The quantity of slag under converter, and table is arranged in write parameters, and the W in table is arranged instead of original parameterSlag_ turns, to revise quantity of slag setting value under converter WSlag_ turns, calculating when for lower one heat steel operation slagging model.
4) calculating of aluminum shot addition:
The effect of aluminum shot is added during LF refining primarily to FeO, aluminum shot are shed to clinker table in removing clinker After on face, aluminum shot is dissolved in clinker and is reacted with FeO in clinker, and reacting dynamics condition is very good, and deoxidation is rapid.Below 6. Formula calculates aluminum shot addition;
WAluminium=WFeO×(γ1/q1) ⑥
Formula 6. in WAluminiumQuality for the aluminium that need to be added, (kg);γ1The ratio of deoxidier is accounted for for aluminium, (%);q1Stove is taken off for aluminium The efficiency of oxygen in slag, (%);
5) calcium carbide addition calculates:
Calcium carbide plays the role of deoxidation and makes clinker foamed as air source, and 7. formula calculates calcium carbide addition below, and One lower limit is set to the addition of calcium carbide, if result of calculation is less than lower limit, is added by lower limit amount, having reached makes clinker steep The effect of foam.
WCaC2=WFeO×(γ2/q4) ⑦
Calcium carbide also has the effect for making clinker foamed as air source, so the addition to calcium carbide is set under one Limit is added if result of calculation is less than lower limit by lower limit amount.
Formula 7. in WCaC2For the amount of calcium carbide need to be added, (kg);γ2The ratio of deoxidier is accounted for for calcium carbide, (%);q4For The utilization rate of calcium carbide, (%);
6) aluminum steel feed quantity calculates
Aluminum steel mainly plays a part of to adjust dissolved aluminum composition in molten steel.
8. formula calculates aluminum steel feed quantity below
WAluminum steel=GAl×100/q3-WDetection-LF enters the station
Formula 8. in WAluminum steelFor the aluminum steel quality of feeding, GAlFor the quality of target aluminium in molten steel composition, (kg);q3It is converted for aluminium For the conversion ratio of dissolved aluminum, (%);
7) calculating of lime adding amount:
Refining furnace addition lime can have the function that working the slag basicity, viscosity, mobility, suitable lime adding amount energy Achieve the effect that desulfurization, submerged arc, absorption are mingled with.
Steel grade is divided into two class of common steel grade and low-sulphur steel, and common steel grade and low-sulphur steel are set in parameter interface W in corresponding target refining slag compositionCaO/(WSiO2+WAl2O3) value.
After ladle enters the station, reads the sulfur content requirement of the steel grade in advance first, belongs to common steel grade or low-sulphur steel, Then the W in corresponding slag system is selectedCaO/(WSiO2+WAl2O3) value, while again due to often being used in compositional ranges in LF refining slag With Al2O3Content increases, and slag melting, viscosity can reduce, to keep the good viscosity of clinker, in Al2O3Content increases When, lime adding amount need to be correspondingly improved.
First, the resistance to material of the amount of aluminum deoxidier, ladle is added to corrode according to the quantity of slag, vessel slag composition, converter tapping under converter Amount, LF aluminium addition, molten steel dissolved aluminum desired value calculate the Al in slag discharging2O3Gross mass;According to the quantity of slag, converter under converter Slag composition, silicon alloy addition, the silicon alloy rate of recovery calculate the SiO in slag discharging2Gross mass, and then according to the mesh set Mark slag system composition, which calculates, generates the lime quality that target slag system composition needs, then subtracts existing lime quality (packet in clinker Include the lime quality in vessel slag, in tapping process be added slag charge lime quality) be the calcium carbonate that LF refining furnace need to be added 9. 10. (11) amount, formula calculate separately Al in clinker2O3Gross mass, SiO2Gross mass and LF refining furnace need the calcium carbonate that is added Amount:
WSlag _ Al2O3=WResistance to material _ Al2O3+WSlag_ turns×(θTurn _ Al2O3/100)+WConverter tapping _ Al2O3 amounts+WLF_Al2O3 amounts
WSlag _ SiO2=WSlag_ turns×(θTurn _ SiO2/100)+WBurning loss of alloy _ SiO2 amounts
WLime=(WSlag _ Al2O3+WSlag _ SiO2)×k1+WSlag _ Al2O3-WSlag_ turns×(θTurn _ CaO/100)-WConverter tapping _ CaO amounts
10. 9. (11) in formula:WSlag _ Al2O3For the quality of alundum (Al2O3) in slag, (kg);WSlag _ SiO2For the matter of silica in slag Amount, (kg);WLimeFor the amount of lime that LF refining furnace needs to be added, (kg);WResistance to material _ Al2O3To wash away three oxidation two in the resistance to material of ladle The quality of aluminium, (kg);WConverter tapping _ Al2O3 amountsFor in converter tapping process due to deoxidation generate Al2O3Quality, (kg); WLF_Al2O3 amountsBe LF refining during due to deoxidation generate Al2O3Quality, (kg);WBurning loss of alloy _ SiO2 amountsFor due to silicon alloy scaling loss The SiO of generation2Amount, (kg);WConverter tapping _ CaO amountsFor the lime quality being added in converter tapping process, (kg);θTurn _ Al2O3For converter The percentage composition of alundum (Al2O3) in slag, (%);θTurn _ SiO2For the percentage composition of silica in vessel slag, (%);θTurn _ CaO For the percentage composition of CaO in vessel slag, (%);.k1For W in target type calcium aluminateCaOAnd WSiO2+WAl2O3Mass ratio;More than W in parameterResistance to material _ Al2O3、θTurn _ Al2O3、θTurn _ SiO2、θTurn _ CaO、k1、k2It need to be set in the parameter interface of slagging model.
8) W in target slag system compositionCaO/(WSiO2+WAl2O3) value revision
Every 2-5 stoves by spectra methods detect LF refining terminal slag composition, and by the slag composition detected with The calculated terminal slag composition of slagging model is compared, and the deviation of slagging model is calculated according to comparing result, according to inclined Difference revises the W in target slag system compositionCaO/(WSiO2+WAl2O3) value, and table is arranged in write parameters, is arranged in table instead of original parameter WCaO/(WSiO2+WAl2O3) value for lower one heat steel operation slagging model when calculating.
Specific revision process is as follows:
k2=(WCaO- is detected-WAl2O3- is detected)/(WSiO2- is detected+WAl2O3- is detected)-k1
K is calculated according to (12) formula2, then utilize k1-k2Value substitutes the k in former slagging model setting interface1Value, is used for down One heat steel runs calculating when slagging model.
Formula (11) in k2For the deviation that slag model calculates slag system composition, WCaO- is detected、WAl2O3- is detected、WSiO2- is detected、 WAl2O3- is detectedFor CaO, Al in the LF refining terminal slag composition that is detected by spectra methods2O3、SiO2Percentage composition.
High level language C# programming LF refining furnace intelligence deoxidation slagging models, the pre- press may be used in the method for the present invention Face, which is directly embedded into Laigang, to be had in model " intelligence steel-making ".
Advantages of the present invention is as follows:
1, the present invention substitutes artificial experience formula deoxidation slag making using the method slag making of calculating, can solve it is manually-operated not Stability stabilizes refining slag system, improves product quality, and reduce labor intensity, keeps refining worker remote From severe flushing and casting environment.
2, according to the method provided by the invention, LF refining is detected by spectra methods every 2-5 stoves to enter the station slag and terminal Slag composition, for correcting the quantity of slag and target slag system composition under converter, calculating when for lower one heat steel operation slagging model can be big The big accuracy rate for improving model calculation.
Description of the drawings
Fig. 1 is the logic relation picture in deoxidation slagging method calculating process provided by the invention.
Specific implementation mode
With the drawings and specific embodiments, the present invention is described in further detail below.
Embodiment 1
As shown in Figure 1, a kind of deoxidation slagging method of LF refining furnace, the described method comprises the following steps:
1) in converter slag FeO percentage compositions calculating:
Oxygen concentration a in the molten steel detected in finishing blowing using revolving furnace sublance[O]To calculate FeO percentages in converter slag Content, specific calculating process are following process:
The oxidation reaction of converter molten steel is by the way that 1. formula is expressed as follows:A in FeO and molten steel in vessel slag[O]Equilibrium equation For:
[Fe]+[O]=(FeO) is 1.
The balanced type of the formula is represented by following 2. formula:
KFeO=aFeO/(a[Fe]×a[O]) ②
Due to a in converter molten steel[O]=1, KFeOFor fixed value, so ideally aFeOWith a[O]It is directly proportional, due to turning A in clinkerFeONumerical value is smaller, according to Raoult's law, is approximately considered FeO concentration in clinker and is equal to FeO activity.
Again to oxygen concentration a in converter molten steel[O]It is detected with corresponding vessel slag composition, to ωFeOWith a[O]Pass System carries out regression analysis, as follows 3. formula:
ωFeO=(5+ (a[O]/800)×18.2)×(72/56) ③
Formula 1. 2. 3. in KFeOFor the equilibrium constant of the oxidation reaction of iron, a[Fe]、a[O]For the activity of Fe in molten steel and oxygen, aFeOFor the activity of FeO in vessel slag, ωFeOFor the mass percentage (%) of FeO in vessel slag.
Oxygen concentration a in the molten steel that revolving furnace sublance is detected in finishing blowing[O]For 400ppm, converter is calculated using 3. formula A concentration of the 18.1% of FeO in slag
2) LF stoves enter the station the calculating of FeO contents in clinker:
The quantity of slag under converter is set as fixed value W in the parameter setting interface of slagging model in advanceSlag_ converters are set
For only adding the steel grade of aluminum deoxidier in converter tapping process, it is de- that excessive aluminum is added in converter tapping process Oxygen agent after ladle is hung in LF refining station, detects acid-soluble aluminum content in molten steel, according to slagging model parameter using Determining oxygen probe The quantity of slag under the converter of interface setting, the decrement of aluminium element calculates LF in molten steel in this period of entering the station from converter tapping to LF Enter the station FeO contents in clinker, as follows 4. formula;
WFeO=WSlag_ turns×(ωFeO/100)-(WAdd aluminium-tapping-WAluminium damages-take off dissolved oxygen-WDetection-LF enters the station)×(q1/100) ④
Formula 4. in WFeOFor FeO mass in the clinker that enters the station, (kg);WSlag_ turnsFor the quantity of slag under converter, (kg);WAdd aluminium-tappingFor converter The aluminum deoxidier quality being added in tapping process, (kg);WAluminium damages-take off dissolved oxygenTo take off the aluminum deoxidier of dissolved oxygen depletion in molten steel Quality, (kg);WDetection-LF enters the stationFor the dissolved aluminum quality detected that enters the station, (kg);q1The efficiency of oxygen in clinker is taken off for aluminium, (%), root It is obtained according to empirical data;W in the above parameterSlag_ turns、q1It need to be set in the parameter interface of slagging model.
The quantity of slag under converter is set as fixed value W in the parameter setting interface of slagging model in advanceSlag_ converters are set, set converter The lower quantity of slag is 1.2 tons, which adds aluminum deoxidier 180kg in converter tapping process, after ladle is hung in LF refining station, It is 0.01% to detect acid-soluble aluminum content in molten steel using Determining oxygen probe, and molten steel is 120 tons, q1It is 150%, is computed the clinker that enters the station Middle FeO mass is 73.2kg.
3) quantity of slag W under converterSlag_ converters are setRevision:
The slag composition that enters the station is detected by spectra methods every 2 stoves, and brings testing result into 4. formula and carrys out anti-push-jump stove The lower quantity of slag, and table is arranged in write parameters, and the W in table is arranged instead of original parameterSlag_ turns, to revise quantity of slag setting value under converter WSlag_ turns, calculating when for lower one heat steel operation slagging model.
It is entered the station slag composition by spectra methods detection, FeO a concentration of 4% in the clinker that enters the station after testing, and calculate The clinker gross mass that enters the station is 1.7 tons, and it is 68kg to calculate FeO mass in entering the station clinker, and 4. formula of bringing into corrects the quantity of slag under converter and is The numerical value is replaced the W in original parameter setting table by 1171kgSlag_ turns, to revise quantity of slag setting value W under converterSlag_ turns, it is used for down One heat steel runs calculating when slagging model.
4) calculating of aluminum shot addition:
The effect of aluminum shot is added during LF refining primarily to FeO, aluminum shot are shed to clinker table in removing clinker After on face, aluminum shot is dissolved in clinker and is reacted with FeO in clinker, and reacting dynamics condition is very good, and deoxidation is rapid.Below 6. Formula calculates aluminum shot addition;
WAluminium=WFeO×(γ1/q1) ⑥
Formula 6. in WAluminiumQuality for the aluminium that need to be added, (kg);γ1The ratio of deoxidier is accounted for for aluminium, (%);q1Stove is taken off for aluminium The efficiency of FeO in slag, (%)
γ1For 70%, q1It is 150%, is computed WAluminiumFor 34.2kg
5) calcium carbide addition calculates
Calcium carbide plays the role of deoxidation and makes clinker foamed as air source, and calcium carbide addition is calculated with following 7. formula, And a lower limit is set to the addition of calcium carbide, if result of calculation is less than lower limit, it is added by lower limit amount, having reached makes clinker The effect of foamed.
WCaC2=WFeO×(γ2/q4) ⑦
Calcium carbide also has the effect for making clinker foamed as air source, so the addition to calcium carbide is set under one Limit is added if result of calculation is less than lower limit by lower limit amount.
Formula 7. in WCaC2For the amount of calcium carbide need to be added, (kg);γ2The ratio of deoxidier is accounted for for calcium carbide, (%);q4For The utilization rate of calcium carbide, (%);
The addition lower limit of calcium carbide is set as 30kg, γ2For 30%, q4It is 70%, is computed WCaC2For 31kg, it is more than Lower limit, calcium carbide are added by 31kg.
6) aluminum steel feed quantity calculates:
Aluminum steel mainly plays a part of to adjust dissolved aluminum composition in molten steel.
8. formula calculates aluminum steel feed quantity below:
WAluminum steel=GAl×100/q3-WDetection-LF enters the station
Formula 8. in WAluminum steelFor the aluminum steel quality of feeding, GAlFor the quality of target aluminium in molten steel composition, (kg);q3It is converted for aluminium For the conversion ratio of dissolved aluminum, (%)
Target acid-soluble aluminum content is 0.03%, and molten steel is 120 tons of q3It is set as 50%, is computed GAlFor 36kg, WAluminum steelFor 60kg。
7) calculating of lime adding amount:
Refining furnace addition lime can have the function that working the slag basicity, viscosity, mobility, suitable lime adding amount energy Achieve the effect that desulfurization, submerged arc, absorption are mingled with.
Steel grade is divided into two class of common steel grade and low-sulphur steel, and common steel grade and low-sulphur steel are set in parameter interface W in corresponding target refining slag compositionCaO/(WSiO2+WAl2O3) value.
After ladle enters the station, the sulfur content requirement of the steel grade is read in advance first, which belongs to low-sulphur steel, then select Go out the W in corresponding slag systemCaO/(WSiO2+WAl2O3) value, while again due to often being used in compositional ranges with Al in LF refining slag2O3 Content increases, and slag melting, viscosity can reduce, to keep the good viscosity of clinker, in Al2O3When content increases, need corresponding Improve lime adding amount.
First, the resistance to material of the amount of aluminum deoxidier, ladle is added to corrode according to the quantity of slag, vessel slag composition, converter tapping under converter Amount, LF aluminium addition, molten steel dissolved aluminum desired value calculate the Al in slag discharging2O3Gross mass;According to the quantity of slag, converter under converter Slag composition, silicon alloy addition, the silicon alloy rate of recovery calculate the SiO in slag discharging2Gross mass, and then according to the mesh set Mark slag system composition, which calculates, generates the lime quality that target slag system composition needs, then subtracts existing lime quality (packet in clinker Include the lime quality in vessel slag, in tapping process be added slag charge lime quality) be the calcium carbonate that LF refining furnace need to be added 9. 10. (11) amount, formula calculate separately Al in clinker2O3Gross mass, SiO2Gross mass and LF refining furnace need the calcium carbonate that is added Amount:
WSlag _ Al2O3=WResistance to material _ Al2O3+WSlag_ turns×(θTurn _ Al2O3/100)+WConverter tapping _ Al2O3 amounts+WLF_Al2O3 amounts
WSlag _ SiO2=WSlag_ turns×(θTurn _ SiO2/100)+WBurning loss of alloy _ SiO2 amounts
WLime=(WSlag _ Al2O3+WSlag _ SiO2)×k1+WSlag _ Al2O3-WSlag_ turns×(θTurn _ CaO/100)-WConverter tapping _ CaO amounts
10. 9. (11) in formula:WSlag _ Al2O3For the quality of alundum (Al2O3) in slag, (kg);WSlag _ SiO2For the quality of silica in slag, (kg);WLimeFor the amount of lime that LF refining furnace needs to be added, (kg);WResistance to material _ Al2O3To wash away alundum (Al2O3) in the resistance to material of ladle Quality, (kg);WConverter tapping _ Al2O3 amountsFor in converter tapping process due to deoxidation generate Al2O3Quality, (kg);WLF_Al2O3 amountsFor Due to the Al of deoxidation generation during LF refining2O3Quality, (kg);WBurning loss of alloy _ SiO2 amountsFor the SiO generated due to silicon alloy scaling loss2 Amount, (kg);WConverter tapping _ CaO amountsFor the lime quality being added in converter tapping process, (kg);θTurn _ Al2O3For three oxygen in vessel slag Change the percentage composition of two aluminium, (%);θTurn _ SiO2For the percentage composition of silica in vessel slag, (%);θTurn _ CaOFor in vessel slag The percentage composition of CaO, (%);.k1For W in target type calcium aluminateCaOAnd WSiO2+WAl2O3Mass ratio;In the above parameter WResistance to material _ Al2O3、θTurn _ Al2O3、θTurn _ SiO2、θTurn _ CaO、k1It need to be set in the parameter interface of slagging model.
Set WResistance to material _ Al2O3For 120kg, θTurn _ Al2O3For 2%, θTurn _ SiO2For 14%, θTurn _ CaOFor 45%, k1It is 1.5, process meter W in calculationConverter tapping _ Al2O3 amountsFor 317kg, WLF_Al2O3 amountsFor 132.6kg, WSlag _ Al2O3For 593.6kg, WBurning loss of alloy _ SiO2 amountsIt is 0, WConverter tapping _ CaO amounts For 600kg, WSlag _ SiO2For 168kg.
It is computed WLimeFor 591kg.
8) W in target slag system compositionCaO/(WSiO2+WAl2O3) value revision:
Every 2 stoves by spectra methods detect LF refining terminal slag composition, and by the slag composition detected with make The calculated terminal slag composition of slag model is compared, and the deviation of slagging model is calculated according to comparing result, according to deviation W in value revision target slag system compositionCaO/(WSiO2+WAl2O3) value, and table is arranged in write parameters, is arranged in table instead of original parameter WCaO/(WSiO2+WAl2O3) value for lower one heat steel operation slagging model when calculating.
Specific revision process is as follows:
k2=(WCaO- is detected-WAl2O3- is detected)/(WSiO2Detection+WAl2O3- is detected)-k1
K is calculated according to (12) formula2, then utilize k1-k2Value substitutes the k in former slagging model setting interface1Value, is used for down One heat steel runs calculating when slagging model.
Formula (11) in k2For the deviation that slag model calculates slag system composition, WCaO- is detected、WAl2O3- is detected、WSiO2- is detected、 WAl2O3- is detectedFor CaO, Al in the LF refining terminal slag composition that is detected by spectra methods2O3、SiO2Percentage composition.
LF refining terminal slag composition is CaO after testing:59%, Al2O3:21%, SiO2:7%, calculate k2For- 0.14, utilize k1-k2Value 1.36 substitutes the k in former slagging model setting interface1Value, when for lower one heat steel operation slagging model Calculating.
The present embodiment can use high level language C# to program LF refining furnace intelligence deoxidation slagging model, and forecast interface is directly embedding Enter to Laigang and has in model " intelligence steel-making ".
The heat carries out deoxidation slag making using intelligent deoxidation slagging model, and white slag sludging time is 8 minutes, refines terminal steel Acid-soluble aluminum content is within the scope of internal control in water, basicity of slag, moderate viscosity, and total oxygen content is 25ppm in molten steel, and S is 0.003%, the quality of refined molten steel is obviously improved using intelligent deoxidation slagging model.
Embodiment 2
As shown in Figure 1, a kind of deoxidation slagging method of LF refining furnace, the described method comprises the following steps:
1) in converter slag FeO percentage compositions calculating:
Oxygen concentration a in the molten steel detected in finishing blowing using revolving furnace sublance[O]To calculate FeO percentages in converter slag Content, specific calculating process are following process:
The oxidation reaction of converter molten steel is by the way that 1. formula is expressed as follows:A in FeO and molten steel in vessel slag[O]Equilibrium equation For:
[Fe]+[O]=(FeO) is 1.
The balanced type of the formula is represented by following 2. formula:
KFeO=aFeO/(a[Fe]×a[O]) ②
Due to a in converter molten steel[O]=1, KFeOFor fixed value, so ideally aFeOWith a[O]It is directly proportional, due to turning A in clinkerFeONumerical value is smaller, according to Raoult's law, is approximately considered FeO concentration in clinker and is equal to FeO activity.
Again to oxygen concentration a in converter molten steel[O]It is detected with corresponding vessel slag composition, to ωFeOWith a[O]Pass System carries out regression analysis, as follows 3. formula:
ωFeO=(5+ (a[O]/800)×18.2)×(72/56) ③
Formula 1. 2. 3. in KFeOFor the equilibrium constant of the oxidation reaction of iron, a[Fe]、a[O]For the activity of Fe in molten steel and oxygen, aFeOFor the activity of FeO in vessel slag, ωFeOFor the mass percentage (%) of FeO in vessel slag.
Oxygen concentration a in the molten steel that revolving furnace sublance is detected in finishing blowing[O]For 350ppm, converter is calculated using 3. formula A concentration of the 16.7% of FeO in slag.
2) LF stoves enter the station the calculating of FeO contents in clinker:
The quantity of slag under converter is set as fixed value W in the parameter setting interface of slagging model in advanceSlag_ converters are set
Add aluminum deoxidier again in the steel grade converter tapping process plus the steel grade of silicon class alloy, due to silicone content in molten steel Higher, the limiting element of deoxidation process is transmission of the oxygen to reaction interface in clinker, and deoxidation speed only has with FeO contents in clinker It closes, calculating LF with 2. formula enters the station FeO contents in clinker:
WFeO=WSlag_ turns×(ωFeO/100)×(1-q2/100) ⑤
Formula 5. in WFeOFor FeO mass in the clinker that enters the station, (kg);WSlag_ turnsFor the quantity of slag under converter, (kg);q2For tapping process The ratio that FeO is removed in middle clinker, (%), rule of thumb data acquisition;W in the above parameterSlag_ turns、q2It need to be in slag making mould It is set in the parameter interface of type.
The quantity of slag under converter is set as fixed value W in the parameter setting interface of slagging model in advanceSlag_ converters are set, set converter The lower quantity of slag is 1.2 tons, adds aluminum deoxidier again in the steel grade converter tapping process plus silicon class alloy, q1It is 60%, is computed The FeO mass in clinker that enters the station is 80.2kg.
3) quantity of slag W under converterSlag_ converters are setRevision:
The slag composition that enters the station is detected by spectra methods every 5 stoves, and brings testing result into 4. formula and carrys out anti-push-jump stove The lower quantity of slag, and table is arranged in write parameters, and the W in table is arranged instead of original parameterSlag_ turns, to revise quantity of slag setting value under converter WSlag_ turns, calculating when for lower one heat steel operation slagging model.
It is entered the station slag composition by spectra methods detection, FeO a concentration of 5% in the clinker that enters the station after testing, and calculate The clinker gross mass that enters the station is 1.7 tons, and it is 85kg to calculate FeO mass in entering the station clinker, and 4. formula of bringing into corrects the quantity of slag under converter and is The numerical value is replaced the W in original parameter setting table by 1229kgSlag_ turns, to revise quantity of slag setting value W under converterSlag_ turns, it is used for down One heat steel runs calculating when slagging model.
4) calculating of aluminum shot addition:
The effect of aluminum shot is added during LF refining primarily to FeO, aluminum shot are shed to clinker table in removing clinker After on face, aluminum shot is dissolved in clinker and is reacted with FeO in clinker, and reacting dynamics condition is very good, and deoxidation is rapid.Below 6. Formula calculates aluminum shot addition:
WAluminium=WFeO×(γ1/q1) ⑥
Formula 6. in WAluminiumQuality for the aluminium that need to be added, (kg);γ1The ratio of deoxidier is accounted for for aluminium, (%);q1Stove is taken off for aluminium The efficiency of FeO in slag, (%);
γ1For 70%, q1It is 150%, is computed WAluminiumFor 37.4kg.
5) calcium carbide addition calculates:
Calcium carbide plays the role of deoxidation and makes clinker foamed as air source, and calcium carbide addition is calculated with following 7. formula, And a lower limit is set to the addition of calcium carbide, if result of calculation is less than lower limit, it is added by lower limit amount, having reached makes clinker The effect of foamed.
WCaC2=WFeO×(γ2/q4) ⑦
Calcium carbide also has the effect for making clinker foamed as air source, so the addition to calcium carbide is set under one Limit is added if result of calculation is less than lower limit by lower limit amount.
Formula 7. in WCaC2For the amount of calcium carbide need to be added, (kg);γ2The ratio of deoxidier is accounted for for calcium carbide, (%);q4For The utilization rate of calcium carbide, (%);
The addition lower limit of calcium carbide is set as 30kg, γ2For 30%, q4It is 70%, is computed WCaC2For 34.4kg, greatly In lower limit, calcium carbide is added by 35kg.
6) aluminum steel feed quantity calculates:
Aluminum steel mainly plays a part of to adjust dissolved aluminum composition in molten steel.
8. formula calculates aluminum steel feed quantity below:
WAluminum steel=GAl×100/q3-WDetection-LF enters the station
Formula 8. in WAluminum steelFor the aluminum steel quality of feeding, GAlFor the quality of target aluminium in molten steel composition, (kg);q3It is converted for aluminium For the conversion ratio of dissolved aluminum, (%);
Target acid-soluble aluminum content is 0.03%, WDetection-LF enters the stationFor 12kg, molten steel is 120 tons of q3It is set as 50%, is computed GAl For 36kg, WAluminum steelFor 60kg.
7) calculating of lime adding amount:
Refining furnace addition lime can have the function that working the slag basicity, viscosity, mobility, suitable lime adding amount energy Achieve the effect that desulfurization, submerged arc, absorption are mingled with.
Steel grade is divided into two class of common steel grade and low-sulphur steel, and common steel grade and low-sulphur steel are set in parameter interface W in corresponding target refining slag compositionCaO/(WSiO2+WAl2O3) value.
After ladle enters the station, reads the sulfur content requirement of the steel grade in advance first, change steel grade and belong to low-sulphur steel, then select Go out the W in corresponding slag systemCaO/(WSiO2+WAl2O3) value, while again due to often being used in compositional ranges with Al in LF refining slag2O3 Content increases, and slag melting, viscosity can reduce, to keep the good viscosity of clinker, in Al2O3When content increases, need corresponding Improve lime adding amount.
First, the resistance to material of the amount of aluminum deoxidier, ladle is added to corrode according to the quantity of slag, vessel slag composition, converter tapping under converter Amount, LF aluminium addition, molten steel dissolved aluminum desired value calculate the Al in slag discharging2O3Gross mass;According to the quantity of slag, converter under converter Slag composition, silicon alloy addition, the silicon alloy rate of recovery calculate the SiO in slag discharging2Gross mass, and then according to the mesh set Mark slag system composition, which calculates, generates the lime quality that target slag system composition needs, then subtracts existing lime quality (packet in clinker Include the lime quality in vessel slag, in tapping process be added slag charge lime quality) be the calcium carbonate that LF refining furnace need to be added 9. 10. (11) amount, formula calculate separately Al in clinker2O3Gross mass, SiO2Gross mass and LF refining furnace need the calcium carbonate that is added Amount:
WSlag _ Al2O3=WResistance to material _ Al2O3+WSlag_ turns×(θTurn _ Al2O3/100)+WConverter tapping _ Al2O3 amounts+WLF_Al2O3 amounts
WSlag _ SiO2=WSlag_ turns×(θTurn _ SiO2/100)+WBurning loss of alloy _ SiO2 amounts
WLime=(WSlag _ Al2O3+WSlag _ SiO2)×k1+WSlag _ Al2O3-WSlag_ turns×(θTurn _ CaO/100)-WConverter tapping _ CaO amounts
10. 9. (11) in formula:WSlag _ Al2O3For the quality of alundum (Al2O3) in slag, (kg);WSlag _ SiO2For the matter of silica in slag Amount, (kg);WLimeFor the amount of lime that LF refining furnace needs to be added, (kg);WResistance to material _ Al2O3To wash away three oxidation two in the resistance to material of ladle The quality of aluminium, (kg);WConverter tapping _ Al2O3 amountsFor in converter tapping process due to deoxidation generate Al2O3Quality, (kg); WLF_Al2O3 amountsBe LF refining during due to deoxidation generate Al2O3Quality, (kg);WBurning loss of alloy _ SiO2 amountsFor due to silicon alloy scaling loss The SiO of generation2Amount, (kg);WConverter tapping _ CaO amountsFor the lime quality being added in converter tapping process, (kg);θTurn _ Al2O3For converter The percentage composition of alundum (Al2O3) in slag, (%);θTurn _ SiO2For the percentage composition of silica in vessel slag, (%);θTurn _ CaO For the percentage composition of CaO in vessel slag, (%);.k1For W in target type calcium aluminateCaOAnd WSiO2+WAl2O3Mass ratio;More than W in parameterResistance to material _ Al2O3、θTurn _ Al2O3、θTurn _ SiO2、θTurn _ CaO、k1It need to be set in the parameter interface of slagging model.
Set WResistance to material _ Al2O3For 120kg, θTurn _ Al2O3For 2%, θTurn _ SiO2For 14%, θTurn _ CaOFor 45%, k1It is 1.5, process meter W in calculationConverter tapping _ Al2O3 amountsFor 247kg, WLF_Al2O3 amountsFor 139kg, WSlag _ Al2O3For 530kg, WBurning loss of alloy _ SiO2 amountsIt is 137, WConverter tapping _ CaO amountsFor 600kg,WSlag _ SiO2For 305kg;
It is computed WLimeFor 642.5kg.
8) W in target slag system compositionCaO/(WSiO2+WAl2O3) value revision:
Every 5 stoves by spectra methods detect LF refining terminal slag composition, and by the slag composition detected with make The calculated terminal slag composition of slag model is compared, and the deviation of slagging model is calculated according to comparing result, according to deviation W in value revision target slag system compositionCaO/(WSiO2+WAl2O3) value, and table is arranged in write parameters, is arranged in table instead of original parameter WCaO/(WSiO2+WAl2O3) value for lower one heat steel operation slagging model when calculating.
Specific revision process is as follows:
k2=(WCaO- is detected-WAl2O3- is detected)/(WSiO2- is detected+WAl2O3- is detected)-k1
K is calculated according to (12) formula2, then utilize k1-k2Value substitutes the k in former slagging model setting interface1Value, is used for down One heat steel runs calculating when slagging model.
Formula (11) in k2For the deviation that slag model calculates slag system composition, WCaO- is detected、WAl2O3- is detected、WSiO2- is detected、 WAl2O3- is detectedFor CaO, Al in the LF refining terminal slag composition that is detected by spectra methods2O3、SiO2Percentage composition.
LF refining terminal slag composition is CaO after testing:56%, Al2O3:17%, SiO2:10%, calculate k2For- 0.06, utilize k1-k2Value 1.44 substitutes the k in former slagging model setting interface1Value, when for lower one heat steel operation slagging model Calculating.
The present embodiment can use high level language C# to program LF refining furnace intelligence deoxidation slagging model, and forecast interface is directly embedding Enter to Laigang and has in model " intelligence steel-making ".
The heat carries out deoxidation slag making using intelligent deoxidation slagging model, and white slag sludging time is 7 minutes, refines terminal steel Acid-soluble aluminum content is within the scope of internal control in water, basicity of slag, moderate viscosity, and total oxygen content is 30ppm in molten steel, and S is 0.005%, the quality of refined molten steel is obviously improved using intelligent deoxidation slagging model.
It should be noted last that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting.Although ginseng It is described the invention in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that the technical side of the present invention Case is modified or replaced equivalently, and without departure from the spirit and scope of technical solution of the present invention, should all be covered in the present invention Right in.

Claims (1)

1. a kind of deoxidation slagging method of LF refining furnace, the described method comprises the following steps:
1) following formula is used to calculate FeO percentage compositions in converter slag:
ωFeO=(5+ (a[O]/800)×18.2)×(72/56);
In formula:a[O]For the activity of steel water oxygen;
ωFeOFor the mass percentage of FeO in vessel slag;
2) LF stoves enter the station the calculating of FeO contents in clinker:
A:For only adding the steel grade of aluminum deoxidier in converter tapping process, excessive aluminum deoxidation is added in converter tapping process Agent after ladle is hung in LF refining station, detects acid-soluble aluminum content in molten steel using Determining oxygen probe, is calculated according to following formula LF enters the station FeO contents in clinker:
WFeO=WSlag_ turns×(ωFeO/100)-(WAdd aluminium-tapping-WAluminium damages-take off dissolved oxygen-WDetection-LF enters the station)×(q1/100);
In formula:WFeOFor FeO mass in the clinker that enters the station;
WSlag_ turnsFor the quantity of slag under converter;
WAdd aluminium-tappingFor the aluminum deoxidier quality being added in converter tapping process;
WAluminium damages-take off dissolved oxygenTo take off the aluminum deoxidier quality of dissolved oxygen depletion in molten steel;
WDetection-LF enters the stationFor the dissolved aluminum quality detected that enters the station;
q1The efficiency of oxygen in clinker is taken off for aluminium;
B:For in converter tapping process i.e. plus aluminum deoxidier again plus the steel grade of silicon class alloy, entered the station stove using following formula calculating LF FeO contents in slag:
WFeO=WSlag_ turns×(ωFeO/100)×(1-q2/100);
In formula:WFeOFor FeO mass in the clinker that enters the station;
WSlag_ turnsFor the quantity of slag under converter;
WAdd aluminium-tappingFor the aluminum deoxidier quality being added in converter tapping process;
WAluminium damages-take off dissolved oxygenTo take off the aluminum deoxidier quality of dissolved oxygen depletion in molten steel;
WDetection-LF enters the stationFor the dissolved aluminum quality detected that enters the station;
q2The ratio being removed for FeO in clinker in tapping process;
C:Quantity of slag W under converterSlag_ converters are setRevision;
The slag composition that enters the station is detected by spectra methods every 2-5 stoves, and the formula that testing result is brought into A, B is carried out into counter push away The quantity of slag under converter, and table is arranged in write parameters, and the W in table is arranged instead of original parameterSlag_ turns, to revise quantity of slag setting value under converter WSlag_ turns, calculating when for lower one heat steel operation slagging model;
3) calculating of aluminum shot addition;
It is calculated as follows aluminum shot addition;
WAluminium=WFeO×(γ1/q1);
W in formulaAluminiumQuality for the aluminium that need to be added;γ1The ratio of deoxidier is accounted for for aluminium;q1The efficiency of oxygen in clinker is taken off for aluminium;
4) calcium carbide addition calculates;
Calcium carbide plays the role of deoxidation and makes clinker foamed as air source, is calculated as follows calcium carbide addition, and to carbonization The addition of calcium sets a lower limit, if result of calculation is less than lower limit, is added by lower limit amount, having reached makes clinker foamed Effect;
WCaC2=WFeO×(γ2/q4);
W in formulaCaC2For the amount of calcium carbide need to be added;γ2The ratio of deoxidier is accounted for for calcium carbide;q4For the utilization rate of calcium carbide;
5) aluminum steel feed quantity calculates;
It is calculated as follows aluminum steel feed quantity;
WAluminum steel=GAl×100/q3-WDetection-LF enters the station
W in formulaAluminum steelFor the aluminum steel quality of feeding, GAlFor the quality of target aluminium in molten steel composition;q3Turning for dissolved aluminum is converted to for aluminium Rate;
6) calculating of lime adding amount;
It is calculated according to following formula:
WSlag _ Al2O3=WResistance to material _ Al2O3+WSlag_ turns×(θTurn _ Al2O3/100)+WConverter tapping _ Al2O3 amounts+WLF_Al2O3 amounts
WSlag _ SiO2=WSlag_ turns×(θTurn _ SiO2/100)+WBurning loss of alloy _ SiO2 amounts
WLime=(WSlag _ Al2O3+WSlag _ SiO2)×k1+WSlag _ Al2O3-WSlag_ turns×(θTurn _ CaO/100)-WConverter tapping _ CaO amounts
In formula:WSlag _ Al2O3For the quality of alundum (Al2O3) in slag;
WSlag _ SiO2For the quality of silica in slag;
WLimeThe amount of lime for needing to be added for LF refining furnace;
WResistance to material _ Al2O3To wash away the quality of alundum (Al2O3) in the resistance to material of ladle;
WConverter tapping _ Al2O3 amountsFor in converter tapping process due to deoxidation generate Al2O3Quality;
WLF_Al2O3 amountsBe LF refining during due to deoxidation generate Al2O3Quality;
WBurning loss of alloy _ SiO2 amountsFor the SiO generated due to silicon alloy scaling loss2Amount;
WConverter tapping _ CaO amountsFor the lime quality being added in converter tapping process;
θTurn _ Al2O3For the percentage composition of the alundum (Al2O3) in vessel slag;
θTurn _ SiO2For the percentage composition of silica in vessel slag;
θTurn _ CaOFor the percentage composition of CaO in vessel slag;
k1For W in target type calcium aluminateCaOAnd WSiO2+WAl2O3Mass ratio;
W in the above parameterResistance to material _ Al2O3、θTurn _ Al2O3、θTurn _ SiO2、θTurn _ CaO、k1It need to be set in the parameter interface of slagging model;
7) W in target slag system compositionCaO/(WSiO2+WAl2O3) value revision:
LF refining terminal slag composition is detected by spectra methods every 2-5 stoves, and by the slag composition detected and slag making The calculated terminal slag composition of model is compared, and the deviation of slagging model is calculated according to comparing result, according to deviation Revise the W in target slag system compositionCaO/(WSiO2+WAl2O3) value, and table is arranged in write parameters, is arranged in table instead of original parameter WCaO/(WSiO2+WAl2O3) value for lower one heat steel operation slagging model when calculating;
Specific revision process is as follows:
k2=(WCaO- is detected-WAl2O3- is detected)/(WSiO2- is detected+WAl2O3- is detected)-k1
Calculate k2, then utilize k1-k2Value substitutes the k in former slagging model setting interface1Value runs slag making for lower one heat steel Calculating when model;
K in formula2For the deviation that slagging model calculates slag system composition, WCaO- is detected、WAl2O3- is detected、WSiO2- is detected、WAl2O3- is detectedIt is logical Cross CaO, Al in the LF refining terminal slag composition that spectra methods detects2O3、SiO2Percentage composition;
8) according to above-mentioned steps 1) -7) result that is calculated carries out LF refining furnace deoxidation slag making.
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