CN110527777A - The method for reducing semi-steel making converter oxygen consumption - Google Patents
The method for reducing semi-steel making converter oxygen consumption Download PDFInfo
- Publication number
- CN110527777A CN110527777A CN201910984239.XA CN201910984239A CN110527777A CN 110527777 A CN110527777 A CN 110527777A CN 201910984239 A CN201910984239 A CN 201910984239A CN 110527777 A CN110527777 A CN 110527777A
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- China
- Prior art keywords
- blowing
- steel
- gas
- oxygen consumption
- steel making
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
Abstract
The present invention relates to the methods for reducing semi-steel making converter oxygen consumption, belong to steelmaking technical field.Present invention solves the technical problem that being that semi-steel making oxygen consumption is big.The technical solution of the present invention is to provide reduce semi-steel making converter oxygen consumption method, step includes: after being blended into half steel to converter, active lime, dolomitic lime and ferrosilicon is added, while being blown with oxygen supply by lance, bottom blowing gas, the gas of the bottom blowing gas includes N2、CO2And Ar.The present invention can reduce semi-steel making converter oxygen consumption by the way that bottom-blowing of converter gas and bottom blowing mode are varied and controlled.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to the method for reducing semi-steel making converter oxygen consumption.
Background technique
China is vanadium titano-magnetite big country, possesses v-ti magnetite ore resources abundant, and the country climbs steel, holds steel, elder brother's steel, prestige steel
Equal iron and steel enterprises are smelted using vanadium titano-magnetite.The molten iron that vanadium titano-magnetite obtains after vanadium extraction by converter blowing referred to as half
Steel, compared with common molten iron-steelmaking, semi-steel making is that trace, the more common molten iron of C content are low and hot due to the Si content in half steel
Source is insufficient, so semi-steel making, which needs to be added, contains SiO2, FeO and Fe2O3The composite slag of equal substances is smelted later period control and is needed
More oxygen re-blow to meet converter terminal temperature control requirement, but its result will lead to semi-steel making converter terminal molten steel C and contain
Measure that lower, oxygen activity is higher, converter terminal oxygen content average value is 650ppm, and converter terminal oxygen content is higher, so as to cause oxygen
Gas consumption is big.
Summary of the invention
Present invention solves the technical problem that being that semi-steel making oxygen consumption is big.
The technical solution that the present invention solves above-mentioned technical problem is to provide the side for reducing semi-steel making converter oxygen consumption
Method, step include: active lime, dolomitic lime and acid composite fluxing medium to be added, while with oxygen rifle after being blended into half steel to converter
Oxygen supply, bottom blowing gas blow, until blowing end point, obtains qualified molten steel；The gas of the bottom blowing gas includes N2、CO2With
Ar。
Wherein, the mode of bottom blowing gas is that blowing starts to 1/3 stage of blowing, bottom blown gas N2；Blew for 1/3 stage extremely
It blew for 2/3 stage, bottom blown gas CO2；Blew for 2/3 stage to finishing blowing, bottom blown gas CO2And Ar.
Wherein, the mode of bottom blowing gas is that blowing started to 1/3 stage of blowing, and air supply intensity is 0.06~0.25Nm3/
t·min；It blows 1/3 stage to 2/3 stage of blowing, air supply intensity is 0.10~0.35Nm3/t·min；Blew for 2/3 stage extremely
Finishing blowing, air supply intensity are 0.20~0.45Nm3/t·min。
Wherein, 2/3 stage of blowing is to finishing blowing, CO in the bottom blown gas2Volume ratio with Ar is 3:1.
Wherein, when blowing oxygen lance nozzle away from the basic 1.4~2m of rifle position of converter molten pool metal bath surface, the rifle position 1.4 that blows~
1.8m is opened and is blown rifle position 2m, catch carbon rifle position 1.4m.
Wherein, active lime additional amount is 10-14kg/t steel, and dolomitic lime additional amount is 10-14kg/t steel, acid compound
Slag former additional amount is 8~12kg/t steel.
Wherein, be calculated in mass percent, in active lime containing 85~90% CaO；In dolomitic lime containing 48~
The MgO of 55% CaO and 30~40%；SiO in acid composite fluxing medium2>=40wt%.
Wherein, control terminal basicity of slag is between 3-4.
Wherein, in converting process, oxygen blast progress is 0-40%, and oxygen supply by lance intensity is 2.5-3.0m3/ tmin, oxygen blast
Progress is 40% to finishing blowing, and oxygen supply by lance intensity is 3.5-4.5m3/t·min。
Wherein, the chemical composition comprises the following components in percentage by weight of half steel is C 4.2~4.40%, Si 0.10~0.15%, Mn
0.01~0.03%, P≤0.07%, S≤0.03%, remaining is Fe and inevitable impurity.
Beneficial effects of the present invention:
The present invention can reduce semi-steel making converter oxygen by the way that bottom-blowing of converter gas and bottom blowing mode are varied and controlled
Gas consumption, oxygen consumption 7820m3It is reduced to 5750m3Hereinafter, remarkable benefit.
Specific embodiment
The method provided by the invention for reducing semi-steel making converter oxygen consumption, specific steps include: to be blended into converter
After half steel, active lime, dolomitic lime and acid composite fluxing medium is added, while blowing with oxygen supply by lance, bottom blowing gas,
Until blowing end point, obtains qualified molten steel；The gas of the bottom blowing gas includes N2、CO2And Ar.
The mode of bottom blowing gas of the present invention are as follows: blowing starts to 1/3 stage of blowing, bottom blown gas N2, air supply intensity is
0.06~0.25Nm3/t·min；It blows extremely 2/3 stage of blowing in 1/3 stage, bottom blown gas CO2, air supply intensity be 0.10~
0.35Nm3/t·min；Blew for 2/3 stage to finishing blowing, bottom blown gas CO2And Ar, air supply intensity be 0.20~
0.45Nm3/t·min。
Preferably, 2/3 stage of blowing is to finishing blowing, CO in the bottom blown gas2Volume ratio with Ar is 3:1.
The present invention is in different phase bottom blowing CO2It can accelerate CO2It is reacted with carbon in steel and generates CO, accelerate decarbonization rate, to mention
High oxygen utilization rate reduces oxygen consumption.
In the present invention, 3 stages of bottom blowing gas were divided with the time, and oxygen blast progress is also to be divided with the time.
In the present invention, the rifle position of oxygen rifle refers to the spray head end of oxygen lance nozzle to the distance of bath surface.It is described to blow
Cheng Zhong, the rifle position control of oxygen rifle are as follows: basic rifle position is 1.4-2m, and blowing rifle position is 1.4m-1.8m, opens and blows rifle position for 2m, catch carbon
Rifle position is 1.4m, and the purpose of setting rifle position in this way is to burn rifle in order to prevent, while guaranteeing that slag has good mobility, with morning
Slugging, more dephosphorizations simultaneously protect furnace lining.
The total blowing Controlling principle of the present invention is: Fast Slag Melting, early slugging, clinker is active, and process does not return dry, not splash.
As one embodiment of the present invention, oxygen supply by lance and bottom blowing gas are started simultaneously at, and are supplied oxygen when to blowing end point
Terminate, bottom blowing terminates after the completion of tapping.
In the present invention, the institute in steel-making is normal for this field for the active lime, dolomitic lime and acid composite fluxing medium
Active lime, dolomitic lime and acid composite fluxing medium.Active lime additional amount is 10-14kg/t steel, and dolomitic lime adds
Entering amount is 10-14kg/t steel, and acid composite fluxing medium additional amount is 8~12kg/t steel.
Specifically, active lime of the present invention mainly contains CaO, and on the basis of the total weight of the active lime,
The content of CaO is 85-90wt%.The dolomitic lime mainly contains MgO and CaO, using the total weight of the dolomitic lime as base
Standard, the content of MgO are 30-40wt%, and the content of CaO is 48-55wt%.SiO in the acidity composite fluxing medium2≥
40wt%.
Blowing end point of the present invention refers to that ingredient, temperature, the oxygen activity of endpoint molten steel reach regulatory requirements, and qualified molten steel is
Finger meets variety classes steel grade endpoint carbon content, temperature and the molten steel of phosphorus content requirement.
The present invention is further illustrated by the following examples.Wherein, active lime, the Gao Mei used in embodiment
Lime, acid composite fluxing medium are steelmaking ingredient, can be bought by conven-tional channels.Wherein, acid composite fluxing medium is with quality
Percentages contain SiO2: 48%, MgO:10%, CaO:12%, TFe (Quan Tie): 20%, MnO:8%, Al2O3: 2%, and
Inevitable impurity.
Embodiment 1
Entering furnace half steel condition is 1310 DEG C of temperature, C:4.25%, Si:0.011%, Mn:0.014, P:0.066%, S:
0.022%.
200t converter smelting after converter is blended into 220t molten iron, is opened and active lime 12kg/t steel is added while blowing into furnace,
Dolomitic lime 13kg and acid composite fluxing medium 10kg/t steel, oxygen lance nozzle are blown away from the basic 1.4~2m of rifle position of molten pool metal liquid level
Rifle position 1.4m~1.8m is refined, opens and blows rifle position 2m, prevents from burning rifle, catch carbon rifle position 1.4m guarantees that slag has good mobility, with
Early slugging, more dephosphorizations simultaneously protect furnace lining.In the present invention, the rifle position of oxygen rifle refers to the spray head end of oxygen lance nozzle to bath surface
Distance.It controls between terminal basicity of slag 3-4, when oxygen blast progress is 0-40%, oxygen supply by lance intensity is 2.5-3.5m3/t·
Between min, oxygen blast progress be 40% to finishing blowing oxygen supply intensity be 3.5-4.5m3Between/tmin, until blowing end point,
Obtain qualified molten steel.Total blowing Controlling principle is: Fast Slag Melting, early slugging, clinker is active, and process does not return dry, not splash.Turn
Furnace bottom air blowing bulk-mode: blowing starts to 1/3 stage to use N2, and flow is 0.08Nm by control3/t·min；Blowing 1/3~2/
3 stages used CO2, and flow is .0.15Nm by control3/t·min；Blowing 2/3~this preceding stage of tapping is mixed using CO2 with Ar
Gas, CO2 and Ar ratio are 3:1, and flow is 0.2Nm by control3/t·min.Using obtaining oxygen consumption after above-mentioned measure
For 5620m3。
Embodiment 2
Entering furnace half steel condition is 1320 DEG C of temperature, C:4.35%, Si:0.010%, Mn:0.024, P:0.056%, S:
0.028%.
200t converter smelting after converter is blended into 220t molten iron, is opened and active lime 11.2kg/t is added while blowing into furnace
Steel, dolomitic lime 12.3kg and acid composite fluxing medium 11kg/t steel, oxygen lance nozzle away from the basic rifle position of molten pool metal liquid level 1.4~
2m, blow rifle position 1.4m~1.8m, opens and blows rifle position 2m, prevents from burning rifle, catch carbon rifle position 1.4m guarantees that slag has flowing well
Property, with early slugging, more dephosphorizations and protect furnace lining.In the present invention, the rifle position of oxygen rifle refers to the spray head end of oxygen lance nozzle to molten
The distance of pond liquid level.It controls between terminal basicity of slag 3-4, when oxygen blast progress is 0-40%, oxygen supply by lance intensity is 2.5-
3.5m3Between/tmin, oxygen blast progress be 40% to finishing blowing oxygen supply intensity be 3.5-4.5m3Between/tmin, until blowing
Terminal is refined, qualified molten steel is obtained.Total blowing Controlling principle is: Fast Slag Melting, early slugging, clinker is active, and process is not returned dry, no
Splash.Bottom-blowing of converter gas mode: blowing starts to 1/3 stage to use N2, and flow is 0.085Nm by control3/t·min；It blows
Refined for 1/3~2/3 stage using CO2, flow is 0.16Nm by control3/t·min；Blowing 2/3~this preceding stage of tapping uses CO2
With Ar mixed gas, CO2 and Ar ratio is 3:1, and flow is 0.23Nm by control3/t·min.Using obtaining oxygen after above-mentioned measure
Gas consumption is 5750m3。
Comparative example
Entering furnace half steel condition is 1326 DEG C of temperature, C:4.28%, Si:0.010%, Mn:0.018, P:0.058%, S:
0.024%.
200t converter smelting after converter is blended into 220t molten iron, is opened and active lime 12.2kg/t is added while blowing into furnace
Steel, dolomitic lime 11.6kg and acid composite fluxing medium 10.6kg/t steel, oxygen lance nozzle is away from the basic rifle position 1.4 of molten pool metal liquid level
~2m, blow rifle position 1.4m~1.8m, opens and blows rifle position 2m, prevents from burning rifle, catch carbon rifle position 1.4m guarantees that slag has stream well
Dynamic property, with early slugging, more dephosphorizations and protects furnace lining.In the present invention, the rifle position of oxygen rifle refers to the spray head end of oxygen lance nozzle extremely
The distance of bath surface.It controls between terminal basicity of slag 3-4, when oxygen blast progress is 0-40%, oxygen supply by lance intensity is 2.5-
3.5m3Between/tmin, oxygen blast progress be 40% to finishing blowing oxygen supply intensity be 3.5-4.5m3Between/tmin, until blowing
Terminal is refined, qualified molten steel is obtained.Total blowing Controlling principle is: Fast Slag Melting, early slugging, clinker is active, and process is not returned dry, no
Splash.Bottom-blowing of converter gas mode: it is 0.1Nm that whole process, which blows Ar flow by control,3/t·min.Using obtaining oxygen after above-mentioned measure
Gas consumption is 7820m3。
Claims (10)
1. the method for reducing semi-steel making converter oxygen consumption, it is characterised in that include the following steps: to be blended into half steel to converter
Afterwards, active lime, dolomitic lime and acid composite fluxing medium is added, while being blown with oxygen supply by lance, bottom blowing gas, until
Blowing end point obtains qualified molten steel；The gas of the bottom blowing gas includes N2、CO2And Ar.
2. the method according to claim 1 for reducing semi-steel making converter oxygen consumption, it is characterised in that: the bottom blowing
The mode of gas supply is that blowing starts to 1/3 stage of blowing, bottom blown gas N2；It blows extremely 2/3 stage of blowing in 1/3 stage, bottom blowing
Gas is CO2；Blew for 2/3 stage to finishing blowing, bottom blown gas CO2And Ar.
3. the method according to claim 1 or 2 for reducing semi-steel making converter oxygen consumption, it is characterised in that: described
The mode of bottom blowing gas is that blowing started to 1/3 stage of blowing, and air supply intensity is 0.06~0.25Nm3/t·min；Blowing 1/3
Stage to 2/3 stage of blowing, air supply intensity are 0.10~0.35Nm3/t·min；Blew for 2/3 stage to finishing blowing, gas supply is strong
Degree is 0.20~0.45Nm3/t·min。
4. the method according to claim 2 or 3 for reducing semi-steel making converter oxygen consumption, it is characterised in that: blowing
2/3 stage to finishing blowing, CO in the bottom blown gas2Volume ratio with Ar is 3:1.
5. the method according to claim 1 for reducing semi-steel making converter oxygen consumption, it is characterised in that: the blowing
When oxygen lance nozzle away from the basic 1.4~2m of rifle position of converter molten pool metal bath surface, blow 1.4~1.8m of rifle position, opens and blows rifle position 2m, catch carbon
Rifle position 1.4m.
6. the method according to claim 1 for reducing semi-steel making converter oxygen consumption, it is characterised in that: the activity
Lime adding amount be 10-14kg/t steel, dolomitic lime additional amount be 10-14kg/t steel, acid composite fluxing medium additional amount be 8~
12kg/t steel.
7. the method according to claim 1 for reducing semi-steel making converter oxygen consumption, it is characterised in that: with quality hundred
Score meter, in the active lime containing 85~90% CaO；Contain 48~55% CaO and 30~40% in dolomitic lime
MgO；SiO in acid composite fluxing medium2>=40wt%.
8. the method according to claim 1 for reducing semi-steel making converter oxygen consumption, it is characterised in that: control terminal
Basicity of slag is between 3-4.
9. the method according to claim 1 for reducing semi-steel making converter oxygen consumption, it is characterised in that: the blowing
In the process, oxygen blast progress is 0-40%, and oxygen supply by lance intensity is 2.5-3.5m3/ tmin, oxygen blast progress are tied for 40% to blowing
Beam, oxygen supply by lance intensity are 3.5-4.5m3/t·min。
10. reduction semi-steel making converter oxygen consumption method according to claim 1, it is characterised in that: the half steel
Chemical composition comprises the following components in percentage by weight be C 4.2~4.40%, Si 0.10~0.15%, Mn 0.01~0.03%, P≤
0.07%, S≤0.03%, remaining is Fe and inevitable impurity.
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| CN201910984239.XA CN110527777A (en) | 2019-10-16 | 2019-10-16 | The method for reducing semi-steel making converter oxygen consumption |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111961797A (en) * | 2020-09-16 | 2020-11-20 | 攀钢集团研究院有限公司 | Method for increasing CO content in semisteel steelmaking converter gas |
| CN112063798A (en) * | 2020-09-16 | 2020-12-11 | 攀钢集团研究院有限公司 | Method for reducing electrode consumption of electric furnace |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205437A (en) * | 2019-07-10 | 2019-09-06 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for reducing TFe content in semi-steel making converter finishing slag |
-
2019
- 2019-10-16 CN CN201910984239.XA patent/CN110527777A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110205437A (en) * | 2019-07-10 | 2019-09-06 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for reducing TFe content in semi-steel making converter finishing slag |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111961797A (en) * | 2020-09-16 | 2020-11-20 | 攀钢集团研究院有限公司 | Method for increasing CO content in semisteel steelmaking converter gas |
| CN112063798A (en) * | 2020-09-16 | 2020-12-11 | 攀钢集团研究院有限公司 | Method for reducing electrode consumption of electric furnace |
| CN112063798B (en) * | 2020-09-16 | 2022-03-22 | 攀钢集团研究院有限公司 | Method for reducing electrode consumption of electric furnace |
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Application publication date: 20191203 |