CN107151725A - The method that carbon is protected in semisteel smelting dephosphorization - Google Patents

The method that carbon is protected in semisteel smelting dephosphorization Download PDF

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Publication number
CN107151725A
CN107151725A CN201710322036.5A CN201710322036A CN107151725A CN 107151725 A CN107151725 A CN 107151725A CN 201710322036 A CN201710322036 A CN 201710322036A CN 107151725 A CN107151725 A CN 107151725A
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steel
carbon
oxygen
protected
smelting
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Inventor
陈均
曾建华
汪盼
梁新腾
施明川
杨森祥
王誉云
彭友全
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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Pangang Group Panzhihua Iron and Steel Research Institute Co Ltd
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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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C5/32—Blowing from above
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/076—Use of slags or fluxes as treating agents
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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

Abstract

The invention belongs to metallurgical technology field, and in particular to a kind of method that carbon is protected in semisteel smelting dephosphorization.Relatively low for existing semisteel smelting endpoint molten steel carbon content, oxygen activity is high, the problems such as finishing slag TFe contents are high, and the present invention provides a kind of method that carbon is protected in semisteel smelting dephosphorization, and step is as follows：Dolomitic lime, active lime are added in a, converter, it is blended into half steel, add ferrosilicon and composite fluxing medium, adjust basicity, add steel-smelting sewage sludge, top blast oxygen, in oxygen blast progress 40~80%, control oxygen lance position in 1.6~1.8m, oxygen blast progress adds corundum slag when being 40~50% and 60~70%；When b, oxygen blast progress 80~100%, adjustment oxygen supply by lance intensity is 2.5~3.0m3/ tmin, it is 0.07~0.15% to treat endpoint molten steel carbon content, and temperature is tapped when being 1600~1620 DEG C.The present invention carries out dephosphorization by carrying out thermal compensation to half steel, to steelmaking converter and protects carbon, improves endpoint molten steel carbon content, reduction finishing slag TFe contents, and then reduce steel-making cost.

Description

The method that carbon is protected in semisteel smelting dephosphorization
Technical field
The invention belongs to metallurgical technology field, and in particular to a kind of method that carbon is protected in semisteel smelting dephosphorization.
Background technology
China possesses abundant v-ti magnetite ore resources, and the country, which climbs steel, hold steel, elder brother's steel, Wei Gangdeng iron and steel enterprises all adopts Smelted with vanadium titano-magnetite, pneumatic steelmaking main material is using the half steel after special vanadium extraction by converter blowing, vanadium-bearing hot metal warp Carbon is 3.4~4.0% in the half steel obtained after desulfurization vanadium extraction, and silicon, manganese content are vestige, and sulphur is≤0.015%, and phosphorus is 0.060~0.080%.
Therefore, semisteel smelting has heat source insufficiency, slagging slow, the shortcomings of dephosphorization effect is poor, finishing slag TFe contents are high.
For a long time, converter terminal bad control when causing semisteel smelting the problem of semi-steel making heat source insufficiency, it has to Using homlolgation, this smelting process early stage dephosphorization effect is poor, smelting process easily return it is dry, mainly by smelt later stage high oxidative enter Row dephosphorization, but this dephosphorization mode easily causes the problems such as endpoint molten steel carbon content is low, oxygen activity is high, and not only smelting cost is high, And influence steel quality.
The content of the invention
The technical problem to be solved in the present invention is：Semisteel smelting carries out dephosphorization by terminal high oxidative for a long time, causes Endpoint molten steel carbon content is relatively low, the problems such as oxygen activity is high, finishing slag TFe contents are high.
The present invention solve technical problem technical scheme be：A kind of method that carbon is protected in semisteel smelting dephosphorization is provided.This method Comprise the following steps：
Dolomitic lime, active lime are added in a, semi-steel making converter, half steel is blended into, adds ferrosilicon and compound slag making Agent, regulation basicity is 1.5~2, and adding steel-smelting sewage sludge makes half steel temperature≤1500 DEG C, and top blast oxygen is smelted, entered in oxygen blast During degree 40~80%, control oxygen lance position keeps constant in 1.6~1.8m any points, and is respectively 40~50% in oxygen blast progress Corundum slag is added during with 60~70%；
B, in oxygen blast progress 80~100%, adjustment oxygen supply by lance intensity is 2.5~3.0m3Between/tmin, end is treated Point carbon content of molten steel is 0.07~0.15%, and temperature is tapped when being 1600~1620 DEG C.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, the active lime described in step a for CaO content >= 85wt% lime, dolomitic lime is content of MgO >=40wt% lime.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, the active lime and dolomitic lime described in step a plus It is 10~15kg/t to enter amount.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, and the ferrosilicon described in step a is Si contents >=75wt%'s Ferrosilicon, ferrosilicon addition is defined by being blended into 0.08~0.16wt% of silicone content after half steel.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, SiO in the composite fluxing medium described in step a2Content >= 40wt%.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, and the steel-smelting sewage sludge ferriferous oxide content described in step a >= 30%, the steel-smelting sewage sludge addition is 3~6kg/t steel.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, and oxygen supply intensity described in step a is 3.0~4.0m3/t· min。
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, and corundum slag described in step b is the tail after Leaching of Vanadium from Vanadium slag Slag, Al2O3Content >=50%；The addition of the corundum slag is 1~2kg/t steel.
Beneficial effects of the present invention are：The present invention provides the method for making steel that carbon is protected in a kind of semisteel smelting dephosphorization, by half-and-half Steel carries out thermal compensation, and then carrying out dephosphorization in steelmaking converter protects carbon, so as to reach raising endpoint molten steel carbon content, reduction finishing slag The purpose such as TFe and oxidisability, and then steel-making cost is reduced, improve steel quality；Contain the invention enables carbon in smelting endpoint molten steel Amount is high, and phosphorus content is low, and finishing slag total iron content is low, due to half steel heat source insufficiency in existing smelting process, and endpoint molten steel carbon content is put down 0.05% or so, molten steel oxygen activity is average in 600ppm or so, and finishing slag TFe contents use the present invention 20% or so Endpoint molten steel carbon content is can be controlled between 0.07~0.15% afterwards, and molten steel oxygen activity is controlled between 100~250pp, finishing slag TFe contents are can be controlled within 17%.Present invention, avoiding the disadvantage that semisteel smelting for a long time relies on later stage high oxidative dephosphorization End, moves forward dephosphorization task during converter smelting, and realizes that carbon is protected in dephosphorization, and smelting cost is reduced while steel quality is improved.
Embodiment
The invention provides a kind of method that carbon is protected in semisteel smelting dephosphorization, comprise the following steps：
Dolomitic lime, active lime are added in a, semi-steel making converter, half steel is blended into, adds ferrosilicon and compound slag making Agent, regulation basicity is 1.5~2, and adding steel-smelting sewage sludge makes half steel temperature≤1500 DEG C, and top blast oxygen is smelted, entered in oxygen blast During degree 40~80%, control oxygen lance position keeps constant in 1.6~1.8m any points, and is respectively 40~50% in oxygen blast progress Corundum slag is added during with 60~70%；
B, in oxygen blast progress 80~100%, adjustment oxygen supply by lance intensity is 2.5~3.0m3Between/tmin, end is treated Point carbon content of molten steel is 0.07~0.15%, and temperature is tapped when being 1600~1620 DEG C.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, the active lime described in step a for CaO content >= 85wt% lime, dolomitic lime is content of MgO >=40wt% lime.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, the active lime and dolomitic lime described in step a plus It is 10~15kg/t to enter amount.When the clinker after a upper stove is left in semi-steel making converter and is smelted, active stone can be suitably reduced Ash and dolomitic lime addition, general addition are advisable with 5~10kg/t, can reduce supplementary product onsumption, cost-effective.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, and the ferrosilicon described in step a is Si contents >=75wt%'s Ferrosilicon, ferrosilicon addition is adjusted with being blended into 0.08~0.16wt% of silicone content after half steel.Adding ferrosilicon on the one hand can be right Half steel carries out thermal compensation, on the other hand, can also adjust basicity of slag, promotes dephosphorization slugging.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, SiO in the composite fluxing medium described in step a2Content >= 40wt%.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, in order to reduce liquid steel temperature, control heating rate, is accelerated Steel-smelting sewage sludge, described steel-smelting sewage sludge ferriferous oxide content >=30% are added in slagging, step a.In order to reach cooling and accelerate The dual purpose of slagging, the steel-smelting sewage sludge addition is 3~6kg/t steel.
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, and oxygen supply intensity described in step a is 3.0~4.0m3/t· min。
Wherein, above-mentioned semisteel smelting dephosphorization is protected in the method for carbon, and corundum slag described in step b is the tail after Leaching of Vanadium from Vanadium slag Slag, Al2O3Content >=50%；The addition of the corundum slag is 1~2kg/t steel.
The present invention adds corundum slag when oxygen blast progress is respectively 40~50% and 60~70%, can effectively prevent stove Slag returns dry；And then can be constant in the holding of 1.6~1.8m any points by control of lance position during oxygen blast progress 40~80%, drop TFe contents in low slag.
Smelting the later stage, when oxygen blast progress is 80~100%, reducing oxygen supply by lance intensity, adjustment oxygen supply by lance intensity is 2.5~3.0m3/t·min.On the one hand, oxygen supply intensity is reduced so that reaction between carbon and oxygen is reduced, and molten steel endpoint carbon content is carried Rise, on the other hand, can also reduce molten steel terminal oxygen activity.
Explanation is further explained to the embodiment of the present invention with reference to embodiment, but does not indicate that and sends out this Bright protection domain is limited in described in embodiment in scope.
Embodiment 1 is smelted using the inventive method to half steel
The 120t converters of certain factory use semi-steel making, and it is 0.075% to enter stove half steel phosphorus content.Entering stove half steel carbon content is 3.0%, half steel temperature is 1310 DEG C, adds ferrosilicon and make it that silicone content reaches 0.08% in half steel, in steel-making after half steel thermal compensation Converter smelting.During smelting, addition dolomitic lime ton steel 5kg after slag, active lime ton steel 10kg is stayed to wrap up in clinker dry, and be blended into Add composite fluxing medium after half steel to control basicity 1.5, while adding steel-smelting sewage sludge cooling, control heating rate and being accelerated into Slag, top blow oxygen lance oxygen supply intensity is 3.0m3/ tmin, and control half steel temperature within the 40% of oxygen blast progress to be not higher than 1500 DEG C, oxygen blast progress is that the control of 40~80% rifle positions uses constant pressure and constant rifle control mode, and rifle position keeps constant in 1.6m, and exists respectively Corundum slag ton steel 1kg reduction slag melting is added when oxygen blast progress is 40% and 60%, prevents from returning dry.Oxygen blast progress 80~ Top blow oxygen lance air supply intensity is 2.5m when 100%3/ tmin, it is 0.15%, endpoint molten steel to finally give endpoint molten steel carbon content Temperature is 1600 DEG C, and endpoint molten steel phosphorus content is 0.008%, and molten steel oxygen activity is only 121ppm, and finishing slag TFe contents are only 15.6%.
Embodiment 2 is smelted using the inventive method to half steel
The 120t converters of certain factory use semi-steel making, and it is 0.085% to enter stove half steel phosphorus content.Entering stove half steel carbon content is 2.8%, half steel temperature is 1300 DEG C, adds ferrosilicon and make it that silicone content reaches 0.16% in half steel, in steel-making after half steel thermal compensation Converter smelting.During smelting, addition dolomitic lime ton steel 10kg after slag, active lime ton steel 5kg is stayed to wrap up in clinker dry, and be blended into Add composite fluxing medium after half steel to control basicity 2, while adding steel-smelting sewage sludge cooling, control heating rate and being accelerated into Slag, top blow oxygen lance oxygen supply intensity is 4.0m3/ tmin, and control half steel temperature within the 40% of oxygen blast progress to be not higher than 1500 DEG C, oxygen blast progress is that the control of 40~80% rifle positions uses constant pressure and constant rifle control mode, and rifle position keeps constant in 1.8m, and exists respectively Corundum slag ton steel 2kg reduction slag melting is added when oxygen blast progress is 40% and 60%, prevents from returning dry.Oxygen blast progress 80~ Top blow oxygen lance air supply intensity is 3.0m when 100%3/ tmin, it is 0.10%, endpoint molten steel to finally give endpoint molten steel carbon content Temperature is 1620 DEG C, and endpoint molten steel phosphorus content is 0.009%, and molten steel oxygen activity is only 236ppm, and finishing slag TFe contents are only 16.1%.
Embodiment 3 is smelted using the inventive method to half steel
The 120t converters of certain factory use semi-steel making, and it is 0.090% to enter stove half steel phosphorus content.Entering stove half steel carbon content is 3.3%, half steel temperature is 1260 DEG C, adds ferrosilicon and make it that silicone content reaches 0.125% in half steel, in steel-making after half steel thermal compensation Converter smelting.During smelting, addition dolomitic lime ton steel 8kg after slag, active lime ton steel 8kg is stayed to wrap up in clinker dry, and be blended into Add composite fluxing medium after half steel to control basicity 1.8, while adding steel-smelting sewage sludge cooling, control heating rate and being accelerated into Slag, top blow oxygen lance oxygen supply intensity is 3.5m3/ tmin, and control half steel temperature within the 40% of oxygen blast progress to be not higher than 1500 DEG C, oxygen blast progress is that the control of 40~80% rifle positions uses constant pressure and constant rifle control mode, and rifle position keeps constant in 1.8m, and exists respectively Corundum slag ton steel 1.5kg reduction slag melting is added when oxygen blast progress is 40% and 60%, prevents from returning dry.Oxygen blast progress 80~ Top blow oxygen lance air supply intensity is 2.7m when 100%3/ tmin, it is 0.12%, endpoint molten steel to finally give endpoint molten steel carbon content Temperature is 1610 DEG C, and endpoint molten steel phosphorus content is 0.008%, and molten steel oxygen activity is only 190ppm, and finishing slag TFe contents are only 15.8%.
Comparative example 1 carries out semisteel smelting without thermal compensation
The 120t converters of certain factory use semi-steel making, and it is 0.075% to enter stove half steel phosphorus content.Entering stove half steel carbon content is 3.0%, half steel temperature is 1310 DEG C, is directly smelted without half steel thermal compensation.A upper stove, which is stayed, adds dolomitic lime ton steel after slag 5kg, active lime ton steel 10kg wrap up in clinker dry, and add composite fluxing medium after half steel is blended into and control basicity 1.5, together When add steel-smelting sewage sludge cooling, control heating rate and accelerate slagging, and control within the 40% of oxygen blast progress half steel temperature not Higher than 1500 DEG C, oxygen blast progress is that the control of 40~80% rifle positions uses constant pressure and constant rifle control mode, and rifle position keeps constant in 1.6m, And corundum slag ton steel 1kg reduction slag melting is added when oxygen blast progress is 40% and 60% respectively, prevent from returning dry.Oxygen blast progress Top blow oxygen lance air supply intensity is 2.5m when 80~100%3/ tmin, it is 0.05%, terminal to finally give endpoint molten steel carbon content Liquid steel temperature is 1603 DEG C, and endpoint molten steel phosphorus content is 0.010%, and molten steel oxygen activity is 625ppm, and finishing slag TFe contents reach 20.6%.
Comparative example 1 can be seen that：When without thermal compensation, temperature deficiency causes that endpoint molten steel temperature is low, phosphorus is higher, and oxygen is lived Degree and TFe are high.
Comparative example 2 is added without steel-smelting sewage sludge and corundum slag carries out semisteel smelting
The 120t converters of certain factory use semi-steel making, and it is 0.085% to enter stove half steel phosphorus content.Entering stove half steel carbon content is 2.8%, half steel temperature is 1300 DEG C, adds ferrosilicon and make it that silicone content reaches 0.16% in half steel, in steel-making after half steel thermal compensation Converter smelting.During smelting, addition dolomitic lime ton steel 10kg after slag, active lime ton steel 5kg is stayed to wrap up in clinker dry, and be blended into Composite fluxing medium is added after half steel to control basicity 2, steel-smelting sewage sludge is added without, and top blow oxygen lance oxygen supply intensity is 4.0m3/t· Min, in the 36% of oxygen blast progress, half steel temperature reaches 1550 DEG C, and smelting process is using frequently adjustment rifle position.Oxygen blast progress 80 Top blow oxygen lance air supply intensity is 3.0m when~100%3/ tmin, it is 0.10%, terminal steel to finally give endpoint molten steel carbon content Coolant-temperature gage is 1650 DEG C, and endpoint molten steel phosphorus content is 0.018%, and molten steel oxygen activity is only 240ppm, and finishing slag TFe contents are only 16.5%.
Comparative example 2 can be seen that：When without steel-smelting sewage sludge and corundum slag, although can guarantee that raising aim carbon, but can not Effective dephosphorization, molten steel phosphorus content is higher.
Comparative example 3 does not adjust oxygen supply intensity and carries out semisteel smelting
The 120t converters of certain factory use semi-steel making, and it is 0.090% to enter stove half steel phosphorus content.Entering stove half steel carbon content is 3.3%, half steel temperature is 1260 DEG C, adds ferrosilicon and make it that silicone content reaches 0.125% in half steel, in steel-making after half steel thermal compensation Converter smelting.During smelting, addition dolomitic lime ton steel 8kg after slag, active lime ton steel 8kg is stayed to wrap up in clinker dry, and be blended into Add composite fluxing medium after half steel to control basicity 1.8, while adding steel-smelting sewage sludge cooling, control heating rate and being accelerated into Slag, top blow oxygen lance oxygen supply intensity is 3.5m3/ tmin, and control half steel temperature within the 40% of oxygen blast progress to be not higher than 1500 DEG C, oxygen blast progress is that the control of 40~80% rifle positions uses constant pressure and constant rifle control mode, and rifle position keeps constant in 1.8m, and exists respectively Corundum slag ton steel 1.5kg reduction slag melting is added when oxygen blast progress is 40% and 60%, prevents from returning dry.Oxygen blast progress 80~ Top blow oxygen lance air supply intensity remains as 3.5m when 100%3/ tmin, it is 0.10%, terminal to finally give endpoint molten steel carbon content Liquid steel temperature is 1620 DEG C, and endpoint molten steel phosphorus content is 0.008%, and molten steel oxygen activity is only 278ppm, and finishing slag TFe contents are only 17.8%.
Comparative example 3 can be seen that：When not reducing top blow oxygen lance oxygen supply intensity in the smelting later stage, the reduction of endpoint molten steel carbon content, Oxygen activity and TFe contents are raised.
From embodiment and comparative example：The present invention carries out half steel thermal compensation by first adding ferrosilicon to half steel, adds Steel-smelting sewage sludge and corundum slag are smelted, and the measure such as oxygen blast later stage reduction oxygen supply intensity cooperates, and has reached jointly to half steel The effect that carbon is protected in dephosphorization is smelted, smelting endpoint molten steel carbon content is high, and phosphorus content and molten steel degree of supporting are low, and finishing slag TFe contents are low, tool There is obvious economic benefit, be adapted to promote the use of.

Claims (8)

1. the method that carbon is protected in semisteel smelting dephosphorization, it is characterised in that comprise the following steps：
Dolomitic lime, active lime are added in a, semi-steel making converter, half steel is blended into, adds ferrosilicon and composite fluxing medium, is adjusted Save basicity be 1.5~2, add steel-smelting sewage sludge make half steel temperature≤1500 DEG C, top blast oxygen is smelted, oxygen blast progress 40~ When 80%, control oxygen lance position keeps constant in 1.6~1.8m any points, and oxygen blast progress be respectively 40~50% and 60~ Corundum slag is added when 70%；
B, in oxygen blast progress 80~100%, adjustment oxygen supply by lance intensity is 2.5~3.0m3Between/tmin, endpoint molten steel is treated Carbon content is 0.07~0.15%, and temperature is tapped when being 1600~1620 DEG C.
2. the method that carbon is protected in semisteel smelting dephosphorization according to claim 1, it is characterised in that：Activity described in step a Lime is CaO content >=85wt% lime, and dolomitic lime is content of MgO >=40wt% lime.
3. the method that carbon is protected in semisteel smelting dephosphorization according to claim 1, it is characterised in that：Activity described in step a The addition of lime and dolomitic lime is 10~15kg/t.
4. the method that carbon is protected in semisteel smelting dephosphorization according to claim 1, it is characterised in that：Ferrosilicon described in step a For Si contents >=75wt% ferrosilicon, ferrosilicon addition is adjusted with being blended into 0.08~0.16wt% of silicone content after half steel.
5. the method that carbon is protected in semisteel smelting dephosphorization according to claim 1, it is characterised in that：Acidity described in step a SiO in composite fluxing medium2Content >=40wt%.
6. the method that carbon is protected in semisteel smelting dephosphorization according to claim 1, it is characterised in that：Steel-making described in step a Sludge ferriferous oxide content >=30%, the steel-smelting sewage sludge addition is 3~6kg/t steel.
7. the method that carbon is protected in semisteel smelting dephosphorization according to claim 1, it is characterised in that：Oxygen supply is strong described in step a Spend for 3.0~4.0m3/t·min。
8. the method that carbon is protected in semisteel smelting dephosphorization according to claim 1, it is characterised in that：Corundum slag described in step b For the tailings after Leaching of Vanadium from Vanadium slag, Al2O3Content >=50%；The addition of the corundum slag is 1~2kg/t steel.
CN201710322036.5A 2017-05-09 2017-05-09 The method that carbon is protected in semisteel smelting dephosphorization Pending CN107151725A (en)

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Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN108018394A (en) * 2017-12-19 2018-05-11 攀钢集团西昌钢钒有限公司 Semisteel smelting depth decarbonization method
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
CN111763795A (en) * 2020-06-18 2020-10-13 大冶特殊钢有限公司 Chromium-removing and carbon-protecting method for smelting Cr-containing molten iron by top-bottom combined blown converter and application

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Application publication date: 20170912