CN106755734A - 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
CN106755734A
CN106755734A CN201611152152.9A CN201611152152A CN106755734A CN 106755734 A CN106755734 A CN 106755734A CN 201611152152 A CN201611152152 A CN 201611152152A CN 106755734 A CN106755734 A CN 106755734A
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slag
al2o3
feo
aluminum
station
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CN106755734B (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 method of LF refining furnace, the described method comprises the following steps:Set up LF refining furnace slagging model, slagging model reads converter data online, and the acid-soluble aluminum content in the molten steel for detecting constantly that enters the station of the charge data, LF stove ladles in converter smelting data, converter tapping process calculates oxidisability, the quantity of slag, composition of the slag that enters the station etc. and enters the station primary condition;Oxidisability in the slag that enters the station determines deoxidier addition;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 field worker and is determined to make according to the knowhow of oneself at present The addition and feed postition of slag charge, can be according to without fixed operational procedure, and so as to cause, indivedual heat slags are partially dilute, resistance to material is invaded The appearance of the problems such as erosion is serious, nozzle blocking occurs in casting process, inclusion content of steel is unstable.Current this kind of empirical formula essence Smelting method need refining workman have abundant knowhow, in refining process, refining workman need frequently dip in slag to observe with iron rod The color of slag, mobility, and determine to refine the addition quantity of slag material and deoxidier with this.Workman is in flushing and casting for refining When, high temperature, noise, dust before refining furnace cause very big actual bodily harm to refining workman, and working environment is very severe.It is domestic The LF refining furnace slagging model that forefathers develop needs refining workman rule of thumb to judge the feelings such as the quantity of slag, slag beneficiation under converter Condition, is then manually entered into slagging model again, but does not grasp the charging of converter smelting data and tapping process due to refining workman Data, and the method that the primary condition that enters the station is difficult to observe by the naked eye observes, and causes the primary condition that enters the station of input accurate True property is relatively low.
The content of the invention
It is an object of the present invention to provide a kind of deoxidation slagging method of LF refining furnace, can be using calculating using the method Machine substitutes refining workman and goes slag making, plays stabilization refining slag system, reduces the consumption of slag material and deoxidier, reduces workman's work strong The purpose of degree.
To reach above-mentioned purpose, the technical solution adopted by the present invention is:LF refining furnace slagging model is set up, slagging model exists Line reads converter data, and charge data, LF stove ladles in converter smelting data, converter tapping process enter the station and detect constantly Molten steel in acid-soluble aluminum content calculate oxidisability, the quantity of slag, composition of the slag that enters the station etc. and enter the station primary condition;According to the slag 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:
Using oxygen concentration a in the molten steel that revolving furnace sublance is detected in finishing blowing[O]To calculate FeO percentages in converter slag Content, specific calculating process is following process:
The oxidation reaction of converter molten steel is expressed by following 1. formula:FeO and a in 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, KFeOIt is fixed value, so ideally aFeOWith a[O]It is directly proportional, due to turning A in slagFeONumerical value is smaller, and according to Raoult's law, FeO concentration is equal to FeO activity in being approximately considered slag.
Again to oxygen concentration a in converter molten steel[O]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. middle KFeOIt is the equilibrium constant of the oxidation reaction of iron, a[Fe]、a[O]It is the activity of Fe and oxygen in molten steel, aFeOIt is the activity of FeO in vessel slag, ωFeOIt is the weight/mass percentage composition (%) of FeO in vessel slag.
2) LF stoves enter the station the calculating of FeO contents in slag:
The quantity of slag under converter is set as fixed value W by the parameter setting interface in slagging model in advanceSlag_ converters set
A:For the steel grade for only adding aluminum deoxidier in converter tapping process, excessive aluminum is added in converter tapping process Deoxidier, after ladle is hung in LF refining station, using acid-soluble aluminum content in Determining oxygen probe detection molten steel, joins according to slagging model The quantity of slag under the converter of number interface settings, the decrement of aluminium element is calculated in molten steel in this period of entering the station from converter tapping to LF LF enters the station FeO contents in slag, as follows 4. formula;
WFeO=WSlag_ turns×(ωFeO/100)-(WPlus aluminium-tapping-WAluminium damages-take off dissolved oxygen-WDetection-LF enters the station)×(q1/100) ④
B:For adding aluminum deoxidier to add the steel grade of silicon class alloy again in converter tapping process, due to silicone content in molten steel It is higher, the limiting element of deoxidation process in slag transmission from oxygen to reaction interface, deoxidation speed only has with FeO contents in slag Close, calculating LF with 2. formula enters the station FeO contents in slag;
WFeO=WSlag_ turns×(ωFeO/100)×(1-q2/100) ⑤
Formula 4. 5. middle WFeOIt is FeO mass in the slag that enters the station, (kg);WSlag_ turnsIt is the quantity of slag under converter, (kg);WPlus aluminium-tappingTo turn The aluminum deoxidier quality 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 stationThe dissolved aluminum quality detected to enter the station, (kg);q1It is the efficiency of oxygen in the de- slag of aluminium, (%), Rule of thumb data are obtained;q2It is the ratio that FeO in slag in tapping process is removed, (%), rule of thumb data acquisition;With W in upper parameterSlag_ turns、q1、q2Need to be set in the parameter interface of slagging model.
3) quantity of slag W under converterSlag_ converters setRevision:
Detected by spectra methods every 2-5 stoves and entered the station slag composition, and 4., 5. testing result brought into formula carrys out counter pushing away The quantity of slag under converter, and write parameters set table, and the W in table is set instead of original parameterSlag_ turnsTo revise quantity of slag setting value under converter WSlag_ turns, calculating during slagging model is run for lower one heat steel.
4) calculating of aluminum shot addition:
The effect of aluminum shot is added during LF refining primarily to removing FeO in slag, aluminum shot is shed to slag table After on face, aluminum shot dissolves in slag and is reacted with FeO in slag, 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. middle WAluminiumIt is the quality of aluminium that need to be added, (kg);γ1The ratio of deoxidier is accounted for for aluminium, (%);q1For aluminium takes off stove The efficiency of oxygen in slag, (%);
5) calcium carbide addition is calculated:
Calcium carbide plays the role of deoxidation and makes slag foamed as source of the gas, and 7. formula calculates calcium carbide addition below, and Addition to calcium carbide sets a lower limit, if result of calculation is less than lower limit, is added by lower limit amount, and having reached steeps slag The effect of foam.
WCaC2=WFeO×(γ2/q4) ⑦
Calcium carbide also has makes the effect of slag foamed as source of the gas, so being set under one to the addition of calcium carbide Limit, if result of calculation is less than lower limit, is added by lower limit amount.
Formula 7. middle 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 is calculated
Aluminum steel mainly plays dissolved aluminum composition in adjustment molten steel.
Hereinafter 8. formula calculates aluminum steel feed quantity
WAluminum steel=GAl×100/q3-WDetection-LF enters the station
Formula 8. middle WAluminum steelIt is the aluminum steel quality of feeding, GAlIt is the quality of target aluminium in molten steel composition, (kg);q3For aluminium is changed It is the conversion ratio of dissolved aluminum, (%);
7) calculating of lime adding amount:
Refining furnace addition lime can reach the effect of working the slag basicity, viscosity, mobility, suitable lime adding amount energy Reach desulfurization, the effect that submerged arc, absorption are mingled with.
Steel grade is divided into common steel grade and the class of low-sulphur steel two, 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, be belonging 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, and is the viscosity for keeping slag good, 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 for setting Mark slag system composition calculates the lime quality that generation target slag system composition needs, then subtracts existing lime quality (bag in slag Include the lime quality in vessel slag, in tapping process add slag charge lime quality) be the calcium carbonate that LF refining furnace need to be added (11) 10. 9. amount, formula calculate Al in slag respectively2O3Gross mass, SiO2Gross mass and LF refining furnace need add calcium carbonate Amount:
WSlag _ Al2O3=WResistance to material _ Al2O3+WSlag_ turns×(θTurn _ Al2O3/100)+WConverter tapping _ Al2O3 amounts+WLF_Al2O3 is measured
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
9. 10. (11) in formula:WSlag _ Al2O3It is the quality of alundum (Al2O3) in slag, (kg);WSlag _ SiO2It is the matter of silica in slag Amount, (kg);WLimeThe amount of lime of addition, (kg) are needed for LF refining furnace;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 generation Al2O3Quality, (kg); WLF_Al2O3 is measuredFor during LF refining due to deoxidation generation Al2O3Quality, (kg);WBurning loss of alloy _ SiO2 amountsIt is due to silicon alloy scaling loss The SiO of generation2Amount, (kg);WConverter tapping _ CaO amountsIt is the lime quality added in converter tapping process, (kg);θTurn _ Al2O3It is converter The percentage composition of the alundum (Al2O3) in slag, (%);θTurn _ SiO2It is the percentage composition of silica in vessel slag, (%);θTurn _ CaO It is the percentage composition of CaO in vessel slag, (%);.k1It is W in target type calcium aluminateCaOAnd WSiO2+WAl2O3Mass ratio;More than W in parameterResistance to material _ Al2O3、θTurn _ Al2O3、θTurn _ SiO2、θTurn _ CaO、k1、k2Need 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 the slag composition that will be detected with The terminal slag composition that slagging model is calculated is contrasted, and the deviation of slagging model is calculated according to comparing result, according to inclined W in difference revision target slag system compositionCaO/(WSiO2+WAl2O3) value, and write parameters set table, instead of in original parameter setting table WCaO/(WSiO2+WAl2O3) value be used for lower one heat steel run 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 using k1-k2Value substitutes the k in former slagging model setting interface1Value, under being used for Calculating during one heat steel operation slagging model.
Formula (11) in k2It is slag model for the deviation that slag system composition is calculated, WCaO- is detected、WAl2O3- is detected、WSiO2- is detected、 WAl2O3- is detectedIt is CaO, the Al in the LF refining terminal slag composition detected by spectra methods2O3、SiO2Percentage composition.
The method of the present invention can be using high level language C# programming LF refining furnace intelligence deoxidation slagging models, the pre- press Face is directly embedded into the existing model in Laigang " intelligence steel-making ".
Advantages of the present invention is as follows:
1st, 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 reduces labor strength, allows refining workman remote From severe flushing and casting environment.
2nd, the method provided according to the present invention, is entered the station slag and terminal every 2-5 stoves by spectra methods detection LF refining Slag composition, for correcting the quantity of slag and target slag system composition under converter, calculating during slagging model is run for lower one heat steel, can be big The big accuracy rate for improving model calculation.
Brief description of the drawings
Logic relation picture in the deoxidation slagging method calculating process that Fig. 1 is provided for the present invention.
Specific embodiment
With the drawings and specific embodiments, the present invention is further detailed explanation 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:
Using oxygen concentration a in the molten steel that revolving furnace sublance is detected in finishing blowing[O]To calculate FeO percentages in converter slag Content, specific calculating process is following process:
The oxidation reaction of converter molten steel is expressed by following 1. formula:FeO and a in 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, KFeOIt is fixed value, so ideally aFeOWith a[O]It is directly proportional, due to turning A in slagFeONumerical value is smaller, and according to Raoult's law, FeO concentration is equal to FeO activity in being approximately considered slag.
Again to oxygen concentration a in converter molten steel[O]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. middle KFeOIt is the equilibrium constant of the oxidation reaction of iron, a[Fe]、a[O]It is the activity of Fe and oxygen in molten steel, aFeOIt is the activity of FeO in vessel slag, ωFeOIt is the weight/mass percentage composition (%) of FeO in vessel slag.
Oxygen concentration a in the molten steel that revolving furnace sublance is detected in finishing blowing[O]It is 400ppm, converter is calculated using 3. formula The concentration of FeO is 18.1% in slag
2) LF stoves enter the station the calculating of FeO contents in slag:
The quantity of slag under converter is set as fixed value W by the parameter setting interface in slagging model in advanceSlag_ converters set
For the steel grade for only adding aluminum deoxidier in converter tapping process, excessive aluminum is added to take off in converter tapping process Oxygen agent, after ladle is hung in LF refining station, using acid-soluble aluminum content in Determining oxygen probe detection molten steel, according to slagging model parameter 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 slag, as follows 4. formula;
WFeO=WSlag_ turns×(ωFeO/100)-(WPlus aluminium-tapping-WAluminium damages-take off dissolved oxygen-WDetection-LF enters the station)×(q1/100) ④
Formula 4. middle WFeOIt is FeO mass in the slag that enters the station, (kg);WSlag_ turnsIt is the quantity of slag under converter, (kg);WPlus aluminium-tappingIt is converter The aluminum deoxidier quality 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 stationThe dissolved aluminum quality detected to enter the station, (kg);q1It is the efficiency of oxygen in the de- slag of aluminium, (%), root Obtained according to empirical data;W in above parameterSlag_ turns、q1Need to be set in the parameter interface of slagging model.
The quantity of slag under converter is set as fixed value W by the parameter setting interface in slagging model in advanceSlag_ converters set, set converter The lower quantity of slag is 1.2 tons, and the steel grade adds aluminum deoxidier 180kg in converter tapping process, after ladle is hung in LF refining station, It is 0.01% using acid-soluble aluminum content in Determining oxygen probe detection molten steel, molten steel is 120 tons, q1It is 150%, is computed the slag that enters the station Middle FeO mass is 73.2kg.
3) quantity of slag W under converterSlag_ converters setRevision:
The slag composition that enters the station is detected by spectra methods every 2 stoves, and brings testing result into 4. formula and carry out anti-push-jump stove The lower quantity of slag, and write parameters set table, and the W in table is set instead of original parameterSlag_ turnsTo revise quantity of slag setting value under converter WSlag_ turns, calculating during slagging model is run for lower one heat steel.
The slag composition that enters the station is detected by spectra methods, FeO concentration is 4% in the slag that enters the station after testing, and is calculated The slag gross mass that enters the station is 1.7 tons, and FeO mass is 68kg in calculating the slag that enters the station, and the quantity of slag is under bringing 4. formula amendment converter into 1171kg, the W in replacing original parameter that table is set the numerical valueSlag_ turnsTo revise quantity of slag setting value W under converterSlag_ turns, under being used for Calculating during one heat steel operation slagging model.
4) calculating of aluminum shot addition:
The effect of aluminum shot is added during LF refining primarily to removing FeO in slag, aluminum shot is shed to slag table After on face, aluminum shot dissolves in slag and is reacted with FeO in slag, 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. middle WAluminiumIt is the quality of aluminium that need to be added, (kg);γ1The ratio of deoxidier is accounted for for aluminium, (%);q1For aluminium takes off stove The efficiency of FeO in slag, (%)
γ1It is 70%, q1It is 150%, is computed WAluminiumIt is 34.2kg
5) calcium carbide addition is calculated
Calcium carbide plays the role of deoxidation and makes slag foamed as source of the gas, and calcium carbide addition is calculated with following 7. formula, And the addition to calcium carbide sets a lower limit, if result of calculation is less than lower limit, added by lower limit amount, having reached makes slag The effect of foamed.
WCaC2=WFeO×(γ2/q4) ⑦
Calcium carbide also has makes the effect of slag foamed as source of the gas, so being set under one to the addition of calcium carbide Limit, if result of calculation is less than lower limit, is added by lower limit amount.
Formula 7. middle 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 for setting calcium carbide is 30kg, γ2It is 30%, q4It is 70%, is computed WCaC2It is 31kg, is more than Lower limit, calcium carbide is added by 31kg.
6) aluminum steel feed quantity is calculated:
Aluminum steel mainly plays dissolved aluminum composition in adjustment molten steel.
Hereinafter 8. formula calculates aluminum steel feed quantity:
WAluminum steel=GAl×100/q3-WDetection-LF enters the station
Formula 8. middle WAluminum steelIt is the aluminum steel quality of feeding, GAlIt is the quality of target aluminium in molten steel composition, (kg);q3For aluminium is changed It is 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 GAlIt is 36kg, WAluminum steelFor 60kg。
7) calculating of lime adding amount:
Refining furnace addition lime can reach the effect of working the slag basicity, viscosity, mobility, suitable lime adding amount energy Reach desulfurization, the effect that submerged arc, absorption are mingled with.
Steel grade is divided into common steel grade and the class of low-sulphur steel two, 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, the steel grade belongs to low-sulphur steel, then selects The W gone out 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, and is the viscosity for keeping slag good, 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 for setting Mark slag system composition calculates the lime quality that generation target slag system composition needs, then subtracts existing lime quality (bag in slag Include the lime quality in vessel slag, in tapping process add slag charge lime quality) be the calcium carbonate that LF refining furnace need to be added (11) 10. 9. amount, formula calculate Al in slag respectively2O3Gross mass, SiO2Gross mass and LF refining furnace need add calcium carbonate Amount:
WSlag _ Al2O3=WResistance to material _ Al2O3+WSlag_ turns×(θTurn _ Al2O3/100)+WConverter tapping _ Al2O3 amounts+WLF_Al2O3 is measured
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 ⑾⑨⑩⑾ In formula:WSlag _ Al2O3It is the quality of alundum (Al2O3) in slag, (kg);WSlag _ SiO2It is the quality of silica in slag, (kg);WLimeIt is LF Refining furnace needs the amount of lime for adding, (kg);WResistance to material _ Al2O3To wash away the quality of alundum (Al2O3) in the resistance to material of ladle, (kg); WConverter tapping _ Al2O3 amountsFor in converter tapping process due to deoxidation generation Al2O3Quality, (kg);WLF_Al2O3 is measuredIt is LF refining process In due to deoxidation generation Al2O3Quality, (kg);WBurning loss of alloy _ SiO2 amountsIt is due to the SiO of silicon alloy scaling loss generation2Amount, (kg); WConverter tapping _ CaO amountsIt is the lime quality added in converter tapping process, (kg);θTurn _ Al2O3It is hundred of the alundum (Al2O3) in vessel slag Divide content, (%);θTurn _ SiO2It is the percentage composition of silica in vessel slag, (%);θTurn _ CaOFor the percentage of CaO in vessel slag contains Amount, (%);.k1It is W in target type calcium aluminateCaOAnd WSiO2+WAl2O3Mass ratio;W in above parameterResistance to material _ Al2O3、 θTurn _ Al2O3、θTurn _ SiO2、θTurn _ CaO、k1Need to be set in the parameter interface of slagging model.
Setting WResistance to material _ Al2O3It is 120kg, θTurn _ Al2O3It is 2%, θTurn _ SiO2It is 14%, θTurn _ CaOIt is 45%, k1It is 1.5, process meter W in calculationConverter tapping _ Al2O3 amountsIt is 317kg, WLF_Al2O3 is measuredIt is 132.6kg, WSlag _ Al2O3It is 593.6kg, WBurning loss of alloy _ SiO2 amountsIt is 0, WConverter tapping _ CaO amounts It is 600kg, WSlag _ SiO2It is 168kg.
It is computed WLimeIt is 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 the slag composition that will be detected with make The terminal slag composition that slag model is calculated is contrasted, 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 write parameters set table, instead of in original parameter setting table WCaO/(WSiO2+WAl2O3) value be used for lower one heat steel run slagging model when calculating.
Specific revision process is as follows:
k2=(WCaO- is detected-WAl2O3- is detected)/(WSiO2- detection+WAl2O3- is detected)-k1
K is calculated according to (12) formula2, then using k1-k2Value substitutes the k in former slagging model setting interface1Value, under being used for Calculating during one heat steel operation slagging model.
Formula (11) in k2It is slag model for the deviation that slag system composition is calculated, WCaO- is detected、WAl2O3- is detected、WSiO2- is detected、 WAl2O3- is detectedIt is CaO, the Al in the LF refining terminal slag composition detected by spectra methods2O3、SiO2Percentage composition.
LF refining terminal slag composition is CaO after testing:59%, Al2O3:21%, SiO2:7%, calculate k2For- 0.14, using k1-k2Value 1.36 substitutes the k in former slagging model setting interface1Value, when running slagging model for lower one heat steel Calculating.
The present embodiment can program LF refining furnace intelligence deoxidation slagging model with high level language C#, and forecast interface is directly embedding Enter in the existing model in Laigang " 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 in the range 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:
Using oxygen concentration a in the molten steel that revolving furnace sublance is detected in finishing blowing[O]To calculate FeO percentages in converter slag Content, specific calculating process is following process:
The oxidation reaction of converter molten steel is expressed by following 1. formula:FeO and a in 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, KFeOIt is fixed value, so ideally aFeOWith a[O]It is directly proportional, due to turning A in slagFeONumerical value is smaller, and according to Raoult's law, FeO concentration is equal to FeO activity in being approximately considered slag.
Again to oxygen concentration a in converter molten steel[O]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. middle KFeOIt is the equilibrium constant of the oxidation reaction of iron, a[Fe]、a[O]It is the activity of Fe and oxygen in molten steel, aFeOIt is the activity of FeO in vessel slag, ωFeOIt is the weight/mass percentage composition (%) of FeO in vessel slag.
Oxygen concentration a in the molten steel that revolving furnace sublance is detected in finishing blowing[O]It is 350ppm, converter is calculated using 3. formula The concentration of FeO is 16.7% in slag.
2) LF stoves enter the station the calculating of FeO contents in slag:
The quantity of slag under converter is set as fixed value W by the parameter setting interface in slagging model in advanceSlag_ converters set
Aluminum deoxidier is added to add the steel grade of silicon class alloy again in the steel grade converter tapping process, due to silicone content in molten steel It is higher, the limiting element of deoxidation process in slag transmission from oxygen to reaction interface, deoxidation speed only has with FeO contents in slag Close, calculating LF with 2. formula enters the station FeO contents in slag:
WFeO=WSlag_ turns×(ωFeO/100)×(1-q2/100) ⑤
Formula 5. middle WFeOIt is FeO mass in the slag that enters the station, (kg);WSlag_ turnsIt is the quantity of slag under converter, (kg);q2It is tapping process The ratio that FeO is removed in middle slag, (%), rule of thumb data acquisition;W in above parameterSlag_ turns、q2Need to be in slag making mould Set in the parameter interface of type.
The quantity of slag under converter is set as fixed value W by the parameter setting interface in slagging model in advanceSlag_ converters 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 slag that enters the station is 80.2kg.
3) quantity of slag W under converterSlag_ converters setRevision:
The slag composition that enters the station is detected by spectra methods every 5 stoves, and brings testing result into 4. formula and carry out anti-push-jump stove The lower quantity of slag, and write parameters set table, and the W in table is set instead of original parameterSlag_ turnsTo revise quantity of slag setting value under converter WSlag_ turns, calculating during slagging model is run for lower one heat steel.
The slag composition that enters the station is detected by spectra methods, FeO concentration is 5% in the slag that enters the station after testing, and is calculated The slag gross mass that enters the station is 1.7 tons, and FeO mass is 85kg in calculating the slag that enters the station, and the quantity of slag is under bringing 4. formula amendment converter into 1229kg, the W in replacing original parameter that table is set the numerical valueSlag_ turnsTo revise quantity of slag setting value W under converterSlag_ turns, under being used for Calculating during one heat steel operation slagging model.
4) calculating of aluminum shot addition:
The effect of aluminum shot is added during LF refining primarily to removing FeO in slag, aluminum shot is shed to slag table After on face, aluminum shot dissolves in slag and is reacted with FeO in slag, 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. middle WAluminiumIt is the quality of aluminium that need to be added, (kg);γ1The ratio of deoxidier is accounted for for aluminium, (%);q1For aluminium takes off stove The efficiency of FeO in slag, (%);
γ1It is 70%, q1It is 150%, is computed WAluminiumIt is 37.4kg.
5) calcium carbide addition is calculated:
Calcium carbide plays the role of deoxidation and makes slag foamed as source of the gas, and calcium carbide addition is calculated with following 7. formula, And the addition to calcium carbide sets a lower limit, if result of calculation is less than lower limit, added by lower limit amount, having reached makes slag The effect of foamed.
WCaC2=WFeO×(γ2/q4) ⑦
Calcium carbide also has makes the effect of slag foamed as source of the gas, so being set under one to the addition of calcium carbide Limit, if result of calculation is less than lower limit, is added by lower limit amount.
Formula 7. middle 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 for setting calcium carbide is 30kg, γ2It is 30%, q4It is 70%, is computed WCaC2It is 34.4kg, greatly In lower limit, calcium carbide is added by 35kg.
6) aluminum steel feed quantity is calculated:
Aluminum steel mainly plays dissolved aluminum composition in adjustment molten steel.
Hereinafter 8. formula calculates aluminum steel feed quantity:
WAluminum steel=GAl×100/q3-WDetection-LF enters the station
Formula 8. middle WAluminum steelIt is the aluminum steel quality of feeding, GAlIt is the quality of target aluminium in molten steel composition, (kg);q3For aluminium is changed It is the conversion ratio of dissolved aluminum, (%);
Target acid-soluble aluminum content is 0.03%, WDetection-LF enters the stationIt is 12kg, molten steel is 120 tons of q3It is set as 50%, is computed GAl It is 36kg, WAluminum steelIt is 60kg.
7) calculating of lime adding amount:
Refining furnace addition lime can reach the effect of working the slag basicity, viscosity, mobility, suitable lime adding amount energy Reach desulfurization, the effect that submerged arc, absorption are mingled with.
Steel grade is divided into common steel grade and the class of low-sulphur steel two, 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, change steel grade and belong to low-sulphur steel, then select The W gone out 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, and is the viscosity for keeping slag good, 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 for setting Mark slag system composition calculates the lime quality that generation target slag system composition needs, then subtracts existing lime quality (bag in slag Include the lime quality in vessel slag, in tapping process add slag charge lime quality) be the calcium carbonate that LF refining furnace need to be added (11) 10. 9. amount, formula calculate Al in slag respectively2O3Gross mass, SiO2Gross mass and LF refining furnace need add calcium carbonate Amount:
WSlag _ Al2O3=WResistance to material _ Al2O3+WSlag_ turns×(θTurn _ Al2O3/100)+WConverter tapping _ Al2O3 amounts+WLF_Al2O3 is measured
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
9. 10. (11) in formula:WSlag _ Al2O3It is the quality of alundum (Al2O3) in slag, (kg);WSlag _ SiO2It is the matter of silica in slag Amount, (kg);WLimeThe amount of lime of addition, (kg) are needed for LF refining furnace;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 generation Al2O3Quality, (kg); WLF_Al2O3 is measuredFor during LF refining due to deoxidation generation Al2O3Quality, (kg);WBurning loss of alloy _ SiO2 amountsIt is due to silicon alloy scaling loss The SiO of generation2Amount, (kg);WConverter tapping _ CaO amountsIt is the lime quality added in converter tapping process, (kg);θTurn _ Al2O3It is converter The percentage composition of the alundum (Al2O3) in slag, (%);θTurn _ SiO2It is the percentage composition of silica in vessel slag, (%);θTurn _ CaO It is the percentage composition of CaO in vessel slag, (%);.k1It is W in target type calcium aluminateCaOAnd WSiO2+WAl2O3Mass ratio;More than W in parameterResistance to material _ Al2O3、θTurn _ Al2O3、θTurn _ SiO2、θTurn _ CaO、k1Need to be set in the parameter interface of slagging model.
Setting WResistance to material _ Al2O3It is 120kg, θTurn _ Al2O3It is 2%, θTurn _ SiO2It is 14%, θTurn _ CaOIt is 45%, k1It is 1.5, process meter W in calculationConverter tapping _ Al2O3 amountsIt is 247kg, WLF_Al2O3 is measuredIt is 139kg, WSlag _ Al2O3It is 530kg, WBurning loss of alloy _ SiO2 amountsIt is 137, WConverter tapping _ CaO amountsFor 600kg,WSlag _ SiO2It is 305kg;
It is computed WLimeIt is 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 the slag composition that will be detected with make The terminal slag composition that slag model is calculated is contrasted, 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 write parameters set table, instead of in original parameter setting table WCaO/(WSiO2+WAl2O3) value be used for lower one heat steel run 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 using k1-k2Value substitutes the k in former slagging model setting interface1Value, under being used for Calculating during one heat steel operation slagging model.
Formula (11) in k2It is slag model for the deviation that slag system composition is calculated, WCaO- is detected、WAl2O3- is detected、WSiO2- is detected、 WAl2O3- is detectedIt is CaO, the Al in the LF refining terminal slag composition detected by spectra methods2O3、SiO2Percentage composition.
LF refining terminal slag composition is CaO after testing:56%, Al2O3:17%, SiO2:10%, calculate k2For- 0.06, using k1-k2Value 1.44 substitutes the k in former slagging model setting interface1Value, when running slagging model for lower one heat steel Calculating.
The present embodiment can program LF refining furnace intelligence deoxidation slagging model with high level language C#, and forecast interface is directly embedding Enter in the existing model in Laigang " 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 in the range 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 embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng The present invention is described in detail according to embodiment, it will be apparent to an ordinarily skilled person in the art that to technical side of the invention Case is modified or equivalent, and without departure from the spirit and scope of technical solution of the present invention, it all should cover in the present invention Right in the middle of.

Claims (1)

1. a kind of deoxidation slagging method of LF refining furnace, the described method comprises the following steps:
1) using FeO percentage compositions in below equation calculating converter slag:
ωFeO=(5+ (a[O]/800)×18.2)×(72/56);
In formula:a[O]It is the activity of steel water oxygen;
ωFeOIt is the weight/mass percentage composition of FeO in vessel slag;
2) LF stoves enter the station the calculating of FeO contents in slag:
A:For the steel grade for only adding aluminum deoxidier in converter tapping process, excessive aluminum deoxidation is added in converter tapping process Agent, after ladle is hung in LF refining station, using acid-soluble aluminum content in Determining oxygen probe detection molten steel, calculates according to below equation LF enters the station FeO contents in slag:
WFeO=WSlag_ turns×(ωFeO/100)-(WPlus aluminium-tapping-WAluminium damages-take off dissolved oxygen-WDetection-LF enters the station)×(q1/100);
In formula:WFeOIt is FeO mass in the slag that enters the station;
WSlag_ turnsIt is the quantity of slag under converter;
WPlus aluminium-tappingIt is the aluminum deoxidier quality 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 stationThe dissolved aluminum quality detected to enter the station;
q1It is the efficiency of oxygen in the de- slag of aluminium;
B:For in converter tapping process i.e. plus aluminum deoxidier again plus silicon class alloy steel grade, entered the station stove using following formula calculating LF FeO contents in slag:
WFeO=WSlag_ turns×(ωFeO/100)×(1-q2/100);
In formula:WFeOIt is FeO mass in the slag that enters the station;
WSlag_ turnsIt is the quantity of slag under converter;
WPlus aluminium-tappingIt is the aluminum deoxidier quality 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 stationThe dissolved aluminum quality detected to enter the station;
q2For the ratio that FeO in slag in tapping process is removed;
C:Quantity of slag W under converterSlag_ converters setRevision;
Detect that the slag composition that enters the station, and the formula that testing result is brought into A, B carry out counter pushing away by spectra methods every 2-5 stoves The quantity of slag under converter, and write parameters set table, and the W in table is set instead of original parameterSlag_ turnsTo revise quantity of slag setting value under converter WSlag_ turns, calculating during slagging model is run for lower one heat steel;
3) calculating of aluminum shot addition;
It is calculated as follows aluminum shot addition;
WAluminium=WFeO×(γ1/q1);
W in formulaAluminiumIt is the quality of aluminium that need to be added;γ1The ratio of deoxidier is accounted for for aluminium;q1It is the efficiency of oxygen in the de- slag of aluminium;
4) calcium carbide addition is calculated;
Calcium carbide plays the role of deoxidation and makes slag foamed as source of the gas, 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, and having reached makes slag 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;q4It is the utilization rate of calcium carbide;
5) aluminum steel feed quantity is calculated;
It is calculated as follows aluminum steel feed quantity;
WAluminum steel=GAl×100/q3-WDetection-LF enters the station
W in formulaAluminum steelIt is the aluminum steel quality of feeding, GAlIt is the quality of target aluminium in molten steel composition;q3For aluminium is converted to turning for dissolved aluminum Rate;
6) calculating of lime adding amount;
Calculated according to below equation:
WSlag _ Al2O3=WResistance to material_Al2O3+WSlag_ turns×(θTurn _ Al2O3/100)+WConverter tapping _ Al2O3 amounts+WLF_Al2O3 is measured
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 _ Al2O3It is the quality of alundum (Al2O3) in slag;
WSlag _ SiO2It is the quality of silica in slag;
WLimeThe amount of lime of addition is needed 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 generation Al2O3Quality;
WLF_Al2O3 is measuredFor during LF refining due to deoxidation generation Al2O3Quality;
WBurning loss of alloy _ SiO2 amountsIt is due to the SiO of silicon alloy scaling loss generation2Amount;
WConverter tapping _ CaO amountsIt is the lime quality added in converter tapping process;
θTurn _ Al2O3It is the percentage composition of the alundum (Al2O3) in vessel slag;
θTurn _ SiO2It is the percentage composition of silica in vessel slag;
θTurn _ CaOIt is the percentage composition of CaO in vessel slag;
k1It is W in target type calcium aluminateCaOAnd WSiO2+WAl2O3Mass ratio;
W in above parameterResistance to material_Al2O3、θTurn _ Al2O3、θTurn _ SiO2、θTurn _ CaO、k1、k2Need to be set in the parameter interface of slagging model It is fixed;
7) W in target slag system compositionCaO/(WSiO2+WAl2O3) value revision:
LF refining terminal slag composition, and the slag composition that will detect and slag making are detected by spectra methods every 2-5 stoves The terminal slag composition that model is calculated is contrasted, and the deviation of slagging model is calculated according to comparing result, according to deviation W in revision target slag system compositionCaO/(WSiO2+WAl2O3) value, and write parameters set table, instead of in original parameter setting table WCaO/(WSiO2+WAl2O3) value be used for lower one heat steel run 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 using k1-k2Value substitutes the k in former slagging model setting interface1Value, slag making is run for lower one heat steel Calculating during model;
K in formula2It is slagging model for the deviation that slag system composition is calculated, WCaO- is detected、WAl2O3- is detected、WSiO2- is detected、WAl2O3- is detectedIt is logical CaO, the Al crossed in the LF refining terminal slag composition that spectra methods is detected2O3、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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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

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107475477A (en) * 2017-07-28 2017-12-15 武汉钢铁有限公司 A kind of method of the quantity of slag under measure converter
CN111479935A (en) * 2017-12-15 2020-07-31 杰富意钢铁株式会社 Method for refining molten iron
TWI700373B (en) * 2018-05-28 2020-08-01 日商日本製鐵股份有限公司 Blowing method in converter
CN108983693A (en) * 2018-07-10 2018-12-11 邯郸钢铁集团有限责任公司 The system and optimization method of a kind of intelligent optimization IF steel top slag
CN109722500A (en) * 2019-02-28 2019-05-07 山东钢铁股份有限公司 A kind of node control method for LF refining furnace processing carbon aluminium-killed steel molten steel

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