CN104673960B - A kind of method of splashing slag in converter - Google Patents
A kind of method of splashing slag in converter Download PDFInfo
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Abstract
A kind of method that the invention discloses splashing slag in converter, before comprising the steps: (1) tapping, sublance TSO probe measures slag oxygen voltage E, calculates now FeO content W in slag according to regression formula；(2) calculate slag amount, control to be that 10 15% calculating need to add slag modifying dosage according to spattering slag FeO content；(3) spatter slag and after 30 40 seconds, add furnace slag modifier；MgO=50%wt, CaO≤10%wt, SiO≤6%wt, C≤10%wt in described furnace slag modifier.The present invention utilizes the slag oxygen voltage data measured to draw the content of FeO in smelting endpoint slag, controls to spatter point molten characteristic of slag blanket by adjusting the content of FeO in slag, reaches minimizing and spatters slag blanket and divide melt, improves and spatter the slag blanket protective effect to furnace lining.
Description
Technical field
The present invention relates to pneumatic steelmaking field, a kind of method of splashing slag in converter.
Background technology
Converter lining protection technology by slag splashing with blow 2 great new techniques that steel-smelting technology is pneumatic steelmaking in recent years again.
Nineteen eighty-three, U.S.'s Praxair company successfully developed Slag Splashing in Converter.Slag splashing the most former
Reason, is state of being kept upright by body of heater after converter tapping, utilizes top blow oxygen lance to furnace injection high pressure nitrogen, will remain after tapping
Remaining slag splash is on furnace lining.Combined blown converter slag splashing is top blast and bottom blowing all to be switched to nitrogen, from upper and lower not Tongfang
Slag in blowing to converter, splashes slag and is bonded on furnace lining.Slag particle is to adhere on furnace lining with great impact power, with furnace wall
In conjunction with quite firm, when this protective layer can stop blowing effectively, the high-temperature fusant erosion to furnace lining, alleviates high temperature gas flow
And slag is to the chemical erosion of furnace lining and mechanical erosion, to safeguard furnace lining, improve furnace life and reduce resistance to material and include gunning refractory etc.
Consume.
Chinese Iron & Steel Enterprises introduced the Slag Splashing in Converter of the U.S., according to the production of self nineties in 20th century
The various Technology of Slag Splashingfor Furnace Maintenance of practical situation independent development, obtain preferable metallurgical effect.Converter lining life is up to 35000
Stove, most steel mill's average furnace life are more than 10000 stoves.
Residue adjustment to be carried out before slag splashing.It is high that patent of invention publication number CN101177720A proposes a kind of converter
The protecting method with splash slag of oxidisability slag, is the tune that addition 30～100kg per ton is made up of anthracite and oxidized coal before spattering slag
Slag agent, then nitrogen-blow slag splashing.Obviously, traditional splashing slag in converter technological requirement leaves the more quantity of slag, and
A large amount of slag adjusting agent is added before spattering slag.Recent years, energy-conserving and environment-protective are increasingly stricter with the job requirement of upgrading potentiation, patent of invention
Publication number CN102424886A proposes decarburization converter less-slag slag splashing technique, is to require to adapt to converter current steel-making according to this
The slag splashing operation of " double slags+few slag " the smelting process exploitation progressively promoted.Therefore research slag splashing technique affects and spatter
The principal element in slag blanket life-span, and in slag splashing technique, carry out quantified controlling, it is achieved the scientific quantification of slag splashing technique,
These problems that present invention is to be addressed just.
Summary of the invention
The present invention provides a kind of method of splashing slag in converter, utilizes the slag oxygen voltage data measured to draw smelting endpoint
The content of FeO in slag, controls to spatter point molten characteristic of slag blanket by adjusting the content of FeO in slag, reaches minimizing and spatters slag blanket and divide
Melt, improves and spatters the slag blanket protective effect to furnace lining.
The technical solution used in the present invention is:
A kind of method of splashing slag in converter, comprises the steps:
(1) before tapping, sublance TSO probe measures slag oxygen voltage E, calculates now FeO content in slag according to regression formula
W；
Described regression formula is:
W=32.919×Ln(E)-162.59
E-slag oxygen voltage/mV, span 140～350mV；
W-slag FeO/%；
(2) calculate slag amount, control to calculate for 10-15% to add slag modifying dosage according to spattering slag FeO content；Slag
Addition use equation below calculate:
G={ (2.14 × [Si]+1.29 × [Mn-Mn is residual]+0.5%) × mMolten iron+ mCalx× 97%+mLight-burned× 93%+
mCoolant× 35% } ÷ (1-[FeO])
G-slag amount/Kg；
mMolten iron、mCalx、mLight-burned、mCoolantBeing respectively molten iron, Calx, gently water the consumption with coolant, unit is Kg；
The addition quality of furnace slag modifier is:
J=12×[G×(W-15%)/144]/10%
J-modifying agent addition/Kg；
(3) furnace slag modifier is added after spattering the slag 30-40 second；MgO=50%wt, CaO≤10%wt in described furnace slag modifier,
SiO2≤6%wt、C≤10%wt；
Preferably, spatter that slag uses low height spatters slag rifle bit pattern: starting to spatter slag rifle position is 1.0 meters, spatters the slag time to 30-
When 40%, rifle position is 1.5 meters, and finally spattering slag rifle potential drop is 0.8-1 rice, and spattering the slag time is 5～6 minutes.
Preferably, staying the quantity of slag is 5-15Kg/t.
It is further preferred that sublance from set minimum point rise to leave slag liquid level during can set the speed of service as
20cm/sec, to ensure the accurate of determination data.
The present invention is to analyze and research the data of oxygen voltage test curve during revolving furnace sublance terminal test further, carries
Go out and utilize the slag oxygen voltage data measured to draw the content of FeO in smelting endpoint slag, by adjusting the content of FeO in slag
Control to spatter point molten characteristic of slag blanket, reach minimizing and spatter slag blanket and divide melt, improve and spatter the slag blanket protective effect to furnace lining.Protect spattering slag
Stove makes full use of the sub-melting phenomenon spattering slag blanket, predicts the furnace retaining effect quality spattering slag blanket by point molten characteristic spattering slag blanket, it
The life-span spattering slag blanket can be evaluated more completely, exactly than melting temperature.It is experimentally confirmed: basicity of slag is 2.5～4.5
In the range of a point molten characteristic is had not significant impact；After in slag, magnesium oxide is in hypersaturated state, slag blanket does not occur substantially
Sub-melting phenomenon, therefore during slag splashing, optimal slag components joins that the target of magnesium is fixed can meet all of smelting to 10 ± 1%
Operating mode；The content of FeO divides the impact of molten characteristic most important on spattering slag blanket, and spattering slag blanket as the content ＜ 15% of FeO will not occur
Significantly sub-melting phenomenon, and point melt spattering slag blanket generation as the content ＞ 15% of FeO raises with the content of FeO, drastically increases
Add.As long as illustrating to determine real-time and accurately the content of FeO, and adjusted control, so that it may so that spattering rear slag to condense in furnace lining
The upper formation slag blanket that spatters fine and close, erosion resistant reaches to protect the purpose of furnace lining.
Bessemerizing terminal, oxygen feeding stop operates, and lower sublance uses TSO probe to carry out thermometric, sample, determine oxygen, determine carbon
Operation.Sublance can set the speed of service as 20cm/sec, to ensure from setting during minimum point rises to leave slag liquid level
Determination data accurate.Choose slag oxygen voltage and measure the most stable one section of collection slag oxygen voltage data in curve, according to
Following regression formula calculates the content of FeO in now slag:
W=32.919×Ln(E)-162.59
E-slag oxygen voltage/mV, span 140～350mV；
W-slag FeO/%.
It is the most crucial that sublance oxygen voltage measures the determination of slag oxygen voltage data area in curve.TSO probe measurement steel
After the temperature of water, oxygen content, probe continues to lift up, and can provide a switching value through slag interface oxygen voltage data, this
Time be the starting point of slag oxygen voltage data area；In like manner probe continues to lift up, through slag and Air Interface thermometric number
According to a switching value can be provided, correspond to sublance oxygen voltage measures just can determine that to be now slag oxygen voltage data area on curve
Terminal.
The content of FeO has a strong impact on the viscosity of slag, it is contemplated that slag the most easily splashes but also possesses dross ability, therefore spatters
In the optimal slag components of slag furnace retaining, the span of control of FeO content is 10～15% wt.The furnace slag modifier such as table 1 is used to carry out
The regulation and control of FeO content.
Table 1 furnace slag modifier Composition Control
Slag amount uses following empirical equation to calculate:
G={ (2.14 × [Si]+1.29 × [Mn-Mn is residual]+0.5%) × mMolten iron+ mCalx× 97%+mLight-burned× 93%+
mCoolant× 35% } ÷ (1-[FeO])
G-slag amount/Kg；
mMolten iron、mCalx、mLight-burned、mCoolantBeing respectively molten iron, Calx, gently water the consumption with coolant, unit is Kg；It is thus desirable to
The furnace slag modifier quality once calling in slag is:
J=12×[G×(W-15%)/144]/10%
J-modifying agent quality；
Blowing end point controls to use the not direct tapping of falling stove technique, and tapping process is stopped fire door and overflow slag.Whole converting process
Middle requirement steadily controls, it is to avoid the slag loss caused due to splash.
Tapping directly carries out spattering slag operation after terminating.Concrete operations mode is, spatters once to call in when slag starts and calculates
Furnace slag modifier, carries out spattering slag.
For ensureing slag splashing effect, use low height spatters slag rifle bit pattern.Starting to spatter slag rifle position is 1.0 meters, spatters slag
Time is 1.5 meters to rifle position during 30-40%, finally spatters slag rifle position and can reduce to 0.8-1.0 rice.Spattering the slag time is 5～6 minutes.
Part slag can be poured out in right amount according to the situation remaining the quantity of slag in stove, it is ensured that staying the quantity of slag is 5-15Kg/t after spattering slag,
It is continuing with when leaving the blowing of next stove for.
The present invention is applicable to have the slag splashing operating process that the various large and medium-sized pneumatic steelmaking of sublance equipment produces.
Use and have the beneficial effects that produced by technique scheme:
The present invention utilizes the slag oxygen voltage data measured to draw the content of FeO in smelting endpoint slag, by adjusting stove
In slag, the content of FeO controls to spatter point molten characteristic of slag blanket, reaches minimizing and spatters slag blanket and divide melt, improves and spatter the slag blanket protection to furnace lining
Effect.
Use low height spatters slag rifle bit pattern, is further ensured that slag splashing effect.
Detailed description of the invention
Below in conjunction with detailed description of the invention, the present invention is further detailed explanation.
150 tons of combined blown converter furnace diameter 5.256m, high 8.664m, dischargeable capacity 165m3.Average tap 180 tons, flat
All oxygen supply times 15 minutes, lime consumption 35Kg/t, light dolomite consumes 20Kg/t, controls finishing slag content of MgO 10 ± 1%
In the range of.
Embodiment 1: furnace life 12963
Before tapping, sublance TSO probe measures slag oxygen voltage is 233mV, calculates now FeO in slag according to regression formula
Content is 16.85%.Calculating slag amount is 114.6Kg/t.(wherein: [Si] 0.42%, [Mn] 0.36%, remaining [Mn] 0.10%, molten iron
Amount 180t, amount of lime 6703Kg, light-burned amount 5168Kg, amount of coolant 5877Kg) according to spatter slag FeO content control be less than 15%
Need to add slag modifying dosage is 305Kg.Spattering slag and add furnace slag modifier 305Kg in 40 seconds, nitrogen flow is 42000Nm3/ h, opens
Blow and spatter slag rifle position 1.0m, after spattering slag 120 seconds, be promoted to 1.5m, spatter and after 240 seconds, be down to 1m remain to terminal, spatter the slag time 6 points
Clock.
Can pour out part slag according to the situation remaining the quantity of slag in stove after spattering slag, staying the quantity of slag is 5Kg/t, leaves next stove for and blows
It is continuing with during refining.
Embodiment 2: furnace life 13256
Before tapping, sublance TSO probe measures slag oxygen voltage is 254mV, calculates now FeO in slag according to regression formula
Content is 19.69%.Calculating slag amount is 117.4Kg/t.(wherein: [Si] 0.39%, [Mn] 0.29%, remaining [Mn] 0.17%, molten iron
Amount 193t, amount of lime 8068Kg, light-burned amount 5738Kg, amount of coolant 3763Kg) according to spatter slag FeO content control be less than 13%
Need to add slag modifying dosage is 1200Kg.Spattering slag and add furnace slag modifier 845Kg in 30 seconds, nitrogen flow is 42000Nm3/h,
Open to blow and spatter slag rifle position 0.8m, after spattering slag 120 seconds, be promoted to 1.5m, spatter and after 240 seconds, be down to 0.9m remain to terminal, spatter the slag time
5 points 50 seconds.
Can pour out part slag according to the situation remaining the quantity of slag in stove after spattering slag, staying the quantity of slag is 15Kg/t, leaves next stove for
It is continuing with during blowing.
Embodiment 3: furnace life 13327
Before tapping, sublance TSO probe measures slag oxygen voltage is 257mV, calculates now FeO in slag according to regression formula
Content is 20.08%.Calculating slag amount is 107.1Kg/t.(wherein: [Si] 0.33%, [Mn] 0.35%, remaining [Mn] 0.16%, molten iron
Amount 191t, amount of lime 6006Kg, light-burned amount 6017Kg, amount of coolant 4662Kg) according to spatter slag FeO content control be less than 10%
Need to add slag modifying dosage is 1600Kg.Spattering slag and add furnace slag modifier 838Kg in 30 seconds, nitrogen flow is 42000Nm3/h,
Open to blow and spatter slag rifle position 0.8m, after spattering slag 120 seconds, be promoted to 1.5m, spatter and after 240 seconds, be down to 0.8m remain to terminal, spatter the slag time
5 minutes.
Can pour out part slag according to the situation remaining the quantity of slag in stove after spattering slag, staying the quantity of slag is 10Kg/t, leaves next stove for
It is continuing with during blowing.
Use Lacam thickness measurement with laser that stove labour later stage furnace lining data are analyzed: (furnace life 12915-13666 stove) number
According to being shown in Table 2
Table 2 relative analysis data
Remarks: "-" number represents that lining thickness increases.
Claims (4)
1. the method for a splashing slag in converter, it is characterised in that comprise the steps:
(1) before tapping, sublance TSO probe measures slag oxygen voltage E, calculates now FeO content W in slag according to regression formula；
Described regression formula is:
W=32.919×Ln(E)-162.59
E-slag oxygen voltage/mV, span 140～350mV；
W-slag FeO/%；
(2) calculate slag amount, control to calculate for 10-15% wt to add slag modifying dosage according to spattering slag FeO content；Slag
Addition uses equation below to calculate:
G={ (2.14 × [Si]+1.29 × [Mn-Mn is residual]+0.5%) × mMolten iron+ mCalx× 97%+mLight-burned× 93%+mCoolant×
35% } ÷ (1-[FeO])
G-slag amount/Kg；
mMolten iron、mCalx、mLight-burned、mCoolantBeing respectively molten iron, Calx, the light-burned and consumption of coolant, unit is Kg；
The addition quality of furnace slag modifier is:
J=12×[G×(W-15%)/144]/10%
J modifying agent addition/Kg；
(3) furnace slag modifier is added after spattering the slag 30-40 second；MgO=50%wt, CaO≤10%wt, SiO in described furnace slag modifier2≤
6%wt、C≤10%wt。
The method of a kind of splashing slag in converter the most according to claim 1, it is characterised in that described in spatter slag use low height
Spatter slag rifle bit pattern: starting to spatter slag rifle position is 1.0 meters, and spattering the slag time is 1.5 meters to rifle position during 30-40%, finally spatters slag rifle position
Reducing to 0.8-1.0 rice, spattering the slag time is 5～6 minutes.
The method of a kind of splashing slag in converter the most according to claim 1, it is characterised in that described in spatter slag after stay the quantity of slag to be
5-15Kg/t。
The method of a kind of splashing slag in converter the most according to claim 1, it is characterised in that the described sublance speed of service is
20cm/sec。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109266807A (en) * | 2018-10-29 | 2019-01-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of big flow bottom blowing splashes slag and splashes furnace retaining technique in conjunction with slag phase with top blast |
| CN109852759B (en) * | 2019-02-12 | 2020-12-18 | 山东钢铁股份有限公司 | Slag splashing furnace protection method for rotational flow oxygen lance nozzle |
| CN110551869A (en) * | 2019-09-24 | 2019-12-10 | 山东钢铁股份有限公司 | method for modifying slag in slag splashing stage of converter |
| CN110904300A (en) * | 2019-12-27 | 2020-03-24 | 安徽工业大学 | Efficient dephosphorization and furnace protection method for converter slag melting point control model |
| CN113186369A (en) * | 2021-04-01 | 2021-07-30 | 邢台钢铁有限责任公司 | Slag splashing furnace protection method |
| CN113913583B (en) * | 2021-10-15 | 2022-09-13 | 张家港荣盛特钢有限公司 | Slag modification and slag splashing furnace protection method |
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| CN102127612A (en) * | 2011-02-15 | 2011-07-20 | 江苏大学 | Slag adjusting and furnace protecting method for controlling rising of converter bottom and furnace wall slag deposition |
| CN102424886A (en) * | 2011-12-31 | 2012-04-25 | 钢铁研究总院 | Furnace protection process for decarburization converter less slag splashing |
| CN102643947A (en) * | 2012-05-08 | 2012-08-22 | 首钢总公司 | Method for shorting slag-splashing converter protection time of converter |
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Patent Citations (5)
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| CN101177720A (en) * | 2007-12-17 | 2008-05-14 | 南京钢铁股份有限公司 | Slag splashing method for converter high-oxidisability furnace residue |
| CN101280365A (en) * | 2008-05-28 | 2008-10-08 | 北京科技大学 | Slag splashing method for nickel-copper smelting converter |
| CN102127612A (en) * | 2011-02-15 | 2011-07-20 | 江苏大学 | Slag adjusting and furnace protecting method for controlling rising of converter bottom and furnace wall slag deposition |
| CN102424886A (en) * | 2011-12-31 | 2012-04-25 | 钢铁研究总院 | Furnace protection process for decarburization converter less slag splashing |
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