CN110484688A - A kind of shallow dephosphorization method of refining of the LF furnace of process for making - Google Patents
A kind of shallow dephosphorization method of refining of the LF furnace of process for making Download PDFInfo
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- CN110484688A CN110484688A CN201910947633.6A CN201910947633A CN110484688A CN 110484688 A CN110484688 A CN 110484688A CN 201910947633 A CN201910947633 A CN 201910947633A CN 110484688 A CN110484688 A CN 110484688A
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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
- C21C7/06—Deoxidising, e.g. killing
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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
- C21C7/0645—Agents used for dephosphorising or desulfurising
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- 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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Abstract
The present invention discloses a kind of shallow dephosphorization method of refining of LF furnace of process for making, the step of process for making includes: blast furnace molten iron → converter smelting dephosphorization → Argon → LF furnace refining desulfuration → RH application of vacuum → continuous casting, the shallow dephosphorization method of refining of LF furnace is after the converter smelting deep dephosphorization step and before the LF furnace refining desulfuration step, it carries out LF furnace and refines shallow dephosphorization treatment, specifically comprise the following steps: 1) oxygen blast Argon；2) power transmission slugging；3) shallow dephosphorization；4) rephosphorization is prevented；Technical solution provided by the invention, by carrying out shallow dephosphorization treatment in LF furnace, it can be by the shallow dephosphorization of the exceeded ladle of phosphorus to the standard requirements for meeting steel grade melting P ingredient, it avoids molten steel and returns to converter secondary treatment, to simply and efficiently dephosphorization dephosphorization, it is excellent that Steel Properties out are smelted with guarantee, while reducing STEELMAKING PRODUCTION cost, improve STEELMAKING PRODUCTION efficiency.
Description
Technical field
The present invention relates to the technical field of smelting of steel, in particular to the shallow dephosphorization method of refining of the LF furnace of a kind of process for making.
Background technique
Phosphorus is generally harmful element in steel, easily forms the defects of being mingled with, being segregated, and will affect the impact flexibility of steel, extends
The performances such as rate need simply and efficiently to remove phosphorus contained in steel to eliminate influence of harmful phosphorus to the performance of steel, to protect
It is excellent to demonstrate,prove the Steel Properties smelted out.
Existing dephosphorization method mainly uses converter smelting dephosphorization, but converter smelting such as process control is improper or tapping process
Slag easily causes ladle phosphorus exceeded.The high conventional redemption means of ladle phosphorus are that molten steel returns to converter secondary treatment dephosphorization, that is, are returned
Furnace processing, but melt down processing and will increase steel-making cost, and reduce production efficiency, it is adversely affected to STEELMAKING PRODUCTION.
Summary of the invention
The purpose of the present invention is to propose to a kind of shallow dephosphorization method of refining of the LF furnace of process for making, and it is high to solve existing ladle phosphorus
The molten steel of use returns to the problem that steel-making cost caused by the dephosphorization mode of converter secondary treatment is high, production efficiency is low.
To achieve the above object, the present invention proposes a kind of shallow dephosphorization method of refining of the LF furnace of process for making, the steelmaker
The step of skill includes: blast furnace molten iron → converter smelting dephosphorization → Argon → LF furnace refining desulfuration → RH application of vacuum → continuous casting, institute
Stating the shallow dephosphorization method of refining of LF refining furnace is walked after the converter smelting deep dephosphorization step and in the LF furnace refining desulfuration
Before rapid, carry out LF furnace and refine shallow dephosphorization treatment, specifically comprise the following steps:
1) it oxygen blast Argon: after molten steel enters LF refining furnace, connects ladle bottom blowing tracheae and carries out the operation of oxygen blast Argon, first oxygen blast to oxygen
Content saturation, it is rear to switch argon gas source Argon and refining process whole process furnace bottom Argon；
2) power transmission slugging: the converter terminal slag charge being crushed after ore, fluorite and natural cooling is added into LF refining furnace, send
Electricity is saturating to clinkerization, and controls molten steel in furnace and the content of FeO in LF refining furnace is improved, to create the environment item of dephosphorization in alkalinity
Part；
3) shallow dephosphorization: clinkerization has a power failure afterwards thoroughly, increases furnace bottom argon blowing rate, and stir using atm number, whipping process supplement adds
Enter converter terminal slag charge, ore and fluorite, and fluorite steel spreading is to slag blanket, shallow dephosphorization phosphorus content into molten steel be w (P) %≤
0.030%；
4) it prevents rephosphorization: the alkaline environment in 1.5~2kg/t of lime holding LF refining furnace being added after the completion of dephosphorization, to prevent non-return
Phosphorus.
Preferably, switch argon gas source Argon in the oxygen blast Argon step after 40 ~ 50s of oxygen blast, and oxygen blast flow is
400NL/min, argon blowing rate 300NL/min.
Preferably, in the power transmission slugging step, the main component of the converter terminal slag charge is: CaO:45~49%；
FeO:14~20%, MgO:9~12%, SiO2:15-20%；Cr2O3: 1-2%；Remaining is the compound of iron, and the converter terminal
The dosage of slag charge is 9 ~ 10kg/t.
Preferably, in the power transmission slugging step, the dosage of the ore is 1.5 ~ 2.8kg/t, the dosage of the fluorite
For 1.5 ~ 2.5kg/t.
Preferably, in the shallow dephosphorization step, the argon blowing rate is 800 ~ 850NL/min, when the atm number stirs
Between be 10 ~ 15min.
Preferably, in the shallow dephosphorization step, the dosage of the converter terminal slag charge is 1 ~ 1.5kg/t, the ore
Dosage is 1 ~ 1.5kg/t, and the dosage of the fluorite is 0.8 ~ 1.2kg/t.
It preferably, further include that Al line is first added in LF refining furnace after the completion of dephosphorization after described the step of preventing rephosphorization
Molten steel deep deoxidation is completed, Oxygen Content in Liquid Steel is down within 20ppm, then CaC2 powder, the diffusion of CaSi powder is added in ladle top slag face
Deoxidation.
Preferably, the Al line additional amount is 1.2~2.8kg/t.
Preferably, the additional amount of the CaC2 powder is 0.8 ~ 1.2kg/t, and the additional amount of the CaSi powder is 0.4 ~ 0.8kg/
t。
Preferably, before the step of oxygen blast Argon further include: weak deoxidation: Mn being added in converter argon-station tapping process and contains
The weak deoxidation of deoxidier of the high carbon ferromanganese of amount 60 ~ 65%, additional amount are 0.2 ~ 0.4kg/t, and keep oxygen content 400 ~
800ppm。
In technical solution provided by the invention, by the technical study to converter dephosphorization and to the ladle refining of LF furnace
The analysis of technique and equipment, developing three primary conditions needed for dephosphorization is: suitable basicity, high FeO content and good
Dynamic conditions, and LF furnace steel ladle bottom argon blowing Stirring device has for good dynamic conditions additionally by ladle top slag
Effect control, and push up slag and suitable FeO content and basicity may be implemented, so, when converter smelting such as process control is improper or tapping
When process slag causes ladle phosphorus exceeded, the environmental condition of dephosphorization can be created in LF furnace before LF furnace refines progress desulfurization,
And shallow dephosphorization treatment is carried out to the exceeded ladle of phosphorus, specifically comprise the following steps: 1) oxygen blast Argon；2) power transmission slugging；3) shallow de-
Phosphorus；4) rephosphorization is prevented；By oxygen blast Argon and power transmission slugging step createed in LF furnace suitable basicity needed for dephosphorization and
High FeO content stirs in conjunction with the Argon of LF furnace Ladle Bottom, shallow dephosphorization treatment is carried out in LF furnace, can be shallow by the exceeded ladle of phosphorus
Dephosphorization phosphorus content into molten steel is w (P) %≤0.030%, and the molten steel for avoiding use returns to the dephosphorization mode of converter secondary treatment
Lead to that steel-making cost is high, production efficiency is low, it is excellent to guarantee to smelt Steel Properties out thus simply and efficiently dephosphorization dephosphorization, together
When reduce STEELMAKING PRODUCTION cost, improve STEELMAKING PRODUCTION efficiency.
The shallow dephosphorization method of refining of the LF furnace of the process for making of the invention has the advantages that
(1) present invention avoids molten steel and returns to converter secondary treatment, to reduce steel-making by completing secondary dephosphorization in LF furnace
Production cost, while improving STEELMAKING PRODUCTION efficiency；
(2) present invention mainly returns to LF furnace using converter terminal slag charge and completes dephosphorization, has effectively achieved the secondary use of resource,
Slag charge is sufficiently rationally and effectively utilized, there are good social and economic benefits；
(3) present invention auxiliary dephosphorization material just completes liquid steel dephosphorization only with several conventional materials such as fluorite, ore, Fluorspar Powder
Task, medicament less investment saved cost.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is a kind of flow diagram of shallow one embodiment of dephosphorization method of refining of the LF furnace of process for making of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
It should be noted that, in this document, the terms "include", "comprise" or its any other variant are intended to non-row
His property includes, so that the process, method, article or the system that include a series of elements not only include those elements, and
And further include other elements that are not explicitly listed, or further include for this process, method, article or system institute it is intrinsic
Element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including being somebody's turn to do
There is also other identical elements in the process, method of element, article or system.
Following serial numbers of the embodiment of the present invention are for illustration only, do not represent the advantages or disadvantages of the embodiments.
Herein, the use of word first, second, and third does not indicate any sequence.It can be by these word solutions
It is interpreted as title.
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
A kind of the step of shallow dephosphorization method of refining of the LF furnace of process for making proposed by the present invention, the process for making includes:
Blast furnace molten iron → converter smelting dephosphorization → Argon → LF furnace refining desulfuration → RH application of vacuum → continuous casting, the LF refining furnace shallowly take off
Phosphorus method of refining is to carry out LF furnace after the converter smelting deep dephosphorization step and before the LF furnace refining desulfuration step
Shallow dephosphorization treatment is refined, Fig. 1 is a kind of flow diagram of an embodiment of the shallow dephosphorization method of refining of LF refining furnace of the invention,
Specifically comprise the following steps:
Oxygen blast Argon: S10 after molten steel enters LF refining furnace, connects ladle bottom blowing tracheae and carries out the operation of oxygen blast Argon, first oxygen blast is extremely
Oxygen content saturation, it is rear to switch argon gas source Argon and refining process whole process furnace bottom Argon；
Further, switch argon gas source Argon in the oxygen blast Argon step after 40 ~ 50s of oxygen blast, and oxygen blast flow is 400NL/
Min, argon blowing rate 300NL/min.
In the oxygen blast Argon step, needs Ladle Bottom oxygen blast and be saturated steel oxygen content in water as far as possible, BOTTOM OXYGEN can
It improves ladle and dissolves [O] content, with environmental condition needed for creating dephosphorization, prepare for dephosphorization treatment.
Power transmission slugging: S20 the converter terminal slag being crushed after ore, fluorite and natural cooling is added into LF refining furnace
Material, power transmission is saturating to clinkerization, and controls molten steel in furnace and the content of FeO in LF refining furnace is improved, to create the ring of dephosphorization in alkalinity
Border condition；
Further, in the power transmission slugging step, the main component of the converter terminal slag charge is: CaO:45~49%；
FeO:14~20%, MgO:9~12%, SiO2:15-20%；Cr2O3: 1-2%；Remaining is the compound of iron, and the converter is whole
The dosage of point slag charge is 9 ~ 10kg/t；The dosage of the ore is 1.5 ~ 2.8kg/t, and the dosage of the fluorite is 1.5 ~ 2.5kg/
T is advisable with 2kg/t.
In the power transmission slugging step, LF furnace is returned to using converter terminal slag charge, increases FeO content, improves the alkali of molten steel
Degree, create dephosphorization needed for environmental condition, meanwhile, using converter terminal slag charge have good dephosphorization effect, secondary recycling,
The production cost for reducing steel-making improves the production efficiency of steel-making.
S30, shallow dephosphorization: clinkerization has a power failure afterwards thoroughly, increases furnace bottom argon blowing rate, and stir using atm number, whipping process
Converter terminal slag charge, ore and fluorite is added in supplement, and fluorite steel spreading, to slag blanket, shallow dephosphorization phosphorus content into molten steel is w
(P)%≤0.030%；
Further, in the shallow dephosphorization step, the argon blowing rate is 800 ~ 850NL/min, the atm number mixing time
For 10 ~ 15min；The dosage of the converter terminal slag charge is 1 ~ 1.5kg/t, and the dosage of the ore is 1 ~ 1.5kg/t, the firefly
The dosage of stone is 0.8 ~ 1.2kg/t, is advisable with 1kg/t.
In the shallow dephosphorization step, using the haptoreaction face of material oxide and phosphorus that strong mixing increase is added, make object
Material oxide is sufficiently reacted with phosphorus, to reduce phosphorus content, sloughs harmful phosphorus.
S40 prevents rephosphorization: the alkaline environment in 1.5~2kg/t of lime holding LF refining furnace is added after the completion of dephosphorization, with
Prevent rephosphorization.It is described to prevent addition lime in rephosphorization step from the molten steel in LF refining furnace being made to keep high alkalinity environment, it is not easy rephosphorization.
In technical solution provided by the invention, by the technical study to converter dephosphorization and to the ladle refining of LF furnace
The analysis of technique and equipment, developing three primary conditions needed for dephosphorization is: suitable basicity, high FeO content and good
Dynamic conditions, and LF furnace steel ladle bottom argon blowing Stirring device has for good dynamic conditions additionally by ladle top slag
Effect control, and push up slag and suitable FeO content and basicity may be implemented, so, when converter smelting such as process control is improper or tapping
When process slag causes ladle phosphorus exceeded, the environmental condition of dephosphorization can be created in LF furnace before LF furnace refines progress desulfurization,
And shallow dephosphorization treatment is carried out to the exceeded ladle of phosphorus, specifically comprise the following steps: 1) oxygen blast Argon；2) power transmission slugging；3) shallow de-
Phosphorus；4) rephosphorization is prevented；By oxygen blast Argon and power transmission slugging step createed in LF furnace suitable basicity needed for dephosphorization and
High FeO content stirs in conjunction with the Argon of LF furnace Ladle Bottom, shallow dephosphorization treatment is carried out in LF furnace, can be shallow by the exceeded ladle of phosphorus
Dephosphorization phosphorus content into molten steel is w (P) %≤0.030%, and the molten steel for avoiding use returns to the dephosphorization mode of converter secondary treatment
Lead to that steel-making cost is high, production efficiency is low, it is excellent to guarantee to smelt Steel Properties out thus simply and efficiently dephosphorization dephosphorization, together
When reduce STEELMAKING PRODUCTION cost, improve STEELMAKING PRODUCTION efficiency.
A kind of shallow dephosphorization method of refining of the LF furnace of process for making proposed by the present invention, after described the step of preventing rephosphorization also
Include: S50, after the completion of dephosphorization, Al line is first added in LF refining furnace and completes molten steel deep deoxidation, Oxygen Content in Liquid Steel is down to
Within 20ppm, then in the addition of ladle top slag face CaC2 powder, CaSi powder diffusive deoxidation.
Further, the Al line additional amount is 1.2~2.8kg/t；The additional amount of the CaC2 powder is 0.8 ~ 1.2kg/
T, the additional amount of the CaSi powder are 0.4 ~ 0.8kg/t.Further, the Al line additional amount is advisable for 2.0kg/t；It is described
The additional amount of CaC2 powder is advisable for 1.0kg/t, and the additional amount of the CaSi powder is advisable for 0.6kg/t.
Above-mentioned steps processing, the addition of Al line is reacted with oxygen carries out deep deoxidation, and CaC2 powder is added in ladle top slag face, CaSi powder expands
Deoxidation is dissipated, oxygen content is quickly reduced, to restore after dephosphorization is complete to LF furnace refining desulfuration condition, subsequent LF refining furnace enters
The Conventional process steps such as subsequent refining desulfuration, deoxidation.
Before a kind of the step of shallow dephosphorization method of refining of the LF furnace of process for making proposed by the present invention, the oxygen blast Argon also
Include: weak deoxidation: being added the weak deoxidation of a certain amount of deoxidier in converter argon-station tapping process, and keep oxygen content 400 ~
800ppm.Further, in the weak deoxygenation step, the deoxidier is the high carbon ferromanganese of Mn content 60 ~ 65%, and additional amount
For 0.2 ~ 0.4kg/t, it is advisable with 0.3kg/t.
The weak deoxidation tapping of high carbon ferromanganese is added in converter argon-station tapping process, it is therefore an objective to which manganese and oxygen carry out deoxygenation, disappear
Part oxygen is consumed, leads to molten steel boiling splash of tapping to prevent block too high levels, causes safety accident, ensure that steelmaking process is raw safely
It produces, improves the production efficiency of steel-making.
Using above-mentioned processing step after LF furnace refines shallow dephosphorization technology processing, the phosphorus content that can will enter the station reduces by 5 ~ 6 hundred
Branch, dephosphorization rate are 14 ~ 16%, meet the standard requirements of steel grade melting P ingredient, dephosphorization effect is good.
Technical solution of the present invention is described in further detail below in conjunction with specific embodiments and the drawings, it should be understood that
Following embodiment is only used to explain the present invention, is not used in the restriction present invention.
The standard requirements of certain variety steel melting P ingredient are as follows: melting P ingredient w (P) %≤0.030%.
Embodiment 1:
LF furnace enters the station molten steel initial phosphorous content: w (P) %:0.034%, the oxygen content that enters the station 400ppm.
1) weak deoxidation: converter argon-station tapping process only tapping process be added 0.2kg/t common high carbon ferromanganese (Mn content
65%), other not allow to be added any alloy and deoxidier, molten steel is without deoxidation operation, and oxygen content (refines after molten steel argon
Enter the station oxygen) 400ppm.
2) it oxygen blast Argon: after molten steel enters LF furnace, connects ladle bottom blowing tracheae and carries out the operation of oxygen blast Argon, first BOTTOM OXYGEN 40s
It is saturated afterwards to oxygen content, switches to argon gas source Argon, refining process whole process BOTTOM ARGON BLOWING.
3) the converter terminal slag charge 9kg/t being crushed after natural cooling, ore power transmission and slag making: are added into LF refining furnace
1.5kg/t, fluorite 1.5kg/t, power transmission is saturating to clinkerization, and controlling molten steel in furnace is in alkalinity, and FeO's contains in raising LF refining furnace
Amount, to create the environmental condition of dephosphorization.
4) shallow dephosphorization: clinkerization has a power failure afterwards thoroughly, and BOTTOM ARGON BLOWING flow is risen to 800NL/min, is stirred using the atm number
Converter terminal slag charge 1kg/t, ore 1kg/t is added in 10min, whipping process, and Fluorspar Powder 0.8kg/t steel spreading to slag blanket shallowly takes off
Phosphorus phosphorus content into molten steel is w (P) %≤0.030%.
5) it prevents rephosphorization: lime 1.5kg/t being added after the completion of dephosphorization to prevent non-return phosphorus.
6) desulfurization of LF furnace restores: after the completion of dephosphorization, Al line being first added in LF refining furnace and completes molten steel deep deoxidation, by molten steel
Oxygen content is down within 20ppm, then CaC2 powder 0.8kg/t, CaSi powder 0.4kg/t, diffusive deoxidation is added in ladle top slag face.With
LF refining furnace enters the Conventional process steps such as subsequent refining desulfuration, deoxidation afterwards.
It should be noted that molten steel, which entered the station to the dephosphorization phase, not to be allowed to add any deoxidier, alloy, core-spun yarn.
It is sampled after stirring, ladle w (P) %:0.029%.
Embodiment 2:
LF furnace enters the station molten steel initial phosphorous content: w (P) %:0.035%, the oxygen content that enters the station 600ppm.
1) weak deoxidation: converter argon-station tapping process only tapping process be added 0.3kg/t common high carbon ferromanganese (Mn content
65%), other not allow to be added any alloy and deoxidier, molten steel is without deoxidation operation, and oxygen content (refines after molten steel argon
Enter the station oxygen) 400ppm.
2) it oxygen blast Argon: after molten steel enters LF furnace, connects ladle bottom blowing tracheae and carries out the operation of oxygen blast Argon, first BOTTOM OXYGEN 45s
It is saturated afterwards to oxygen content, switches to argon gas source Argon, refining process whole process BOTTOM ARGON BLOWING.
3) the converter terminal slag charge 9.5kg/t being crushed after natural cooling, ore power transmission and slag making: are added into LF refining furnace
2.0kg/t, fluorite 2kg/t, power transmission is saturating to clinkerization, and controlling molten steel in furnace is in alkalinity, and FeO's contains in raising LF refining furnace
Amount, to create the environmental condition of dephosphorization.
4) shallow dephosphorization: clinkerization has a power failure afterwards thoroughly, and BOTTOM ARGON BLOWING flow is risen to 830NL/min, is stirred using the atm number
13min, whipping process be added converter terminal slag charge 1.3kg/t, ore 1.3kg/t, Fluorspar Powder 1.0kg/t steel spreading to slag blanket,
Shallow dephosphorization phosphorus content into molten steel is w (P) %≤0.030%.
5) it prevents rephosphorization: lime 1.8kg/t being added after the completion of dephosphorization to prevent non-return phosphorus.
6) desulfurization of LF furnace restores: after the completion of dephosphorization, Al line being first added in LF refining furnace and completes molten steel deep deoxidation, by molten steel
Oxygen content is down within 20ppm, then CaC2 powder 1.0kg/t, CaSi powder 0.6kg/t, diffusive deoxidation is added in ladle top slag face.With
LF refining furnace enters the Conventional process steps such as subsequent refining desulfuration, deoxidation afterwards.
It should be noted that molten steel, which entered the station to the dephosphorization phase, not to be allowed to add any deoxidier, alloy, core-spun yarn.
It is sampled after stirring, ladle w (P) %:0.030%.
Embodiment 3:
LF furnace enters the station molten steel initial phosphorous content: w (P) %:0.036%, the oxygen content that enters the station 800ppm.
1) weak deoxidation: converter argon-station tapping process only tapping process be added 0.4kg/t common high carbon ferromanganese (Mn content
65%), other not allow to be added any alloy and deoxidier, molten steel is without deoxidation operation, and oxygen content (refines after molten steel argon
Enter the station oxygen) 400ppm.
2) it oxygen blast Argon: after molten steel enters LF furnace, connects ladle bottom blowing tracheae and carries out the operation of oxygen blast Argon, first BOTTOM OXYGEN 50s
It is saturated afterwards to oxygen content, switches to argon gas source Argon, refining process whole process BOTTOM ARGON BLOWING.
3) the converter terminal slag charge 10kg/t being crushed after natural cooling, ore power transmission and slag making: are added into LF refining furnace
2.8kg/t, fluorite 2.5kg/t, power transmission is saturating to clinkerization, and controlling molten steel in furnace is in alkalinity, and FeO's contains in raising LF refining furnace
Amount, to create the environmental condition of dephosphorization.
4) shallow dephosphorization: clinkerization has a power failure afterwards thoroughly, and BOTTOM ARGON BLOWING flow is risen to 850NL/min, is stirred using the atm number
15min, whipping process be added converter terminal slag charge 1.5kg/t, ore 1.5kg/t, Fluorspar Powder 1.2kg/t steel spreading to slag blanket,
Shallow dephosphorization phosphorus content into molten steel is w (P) %≤0.030%.
5) it prevents rephosphorization: lime 1.8kg/t being added after the completion of dephosphorization to prevent non-return phosphorus.
6) desulfurization of LF furnace restores: after the completion of dephosphorization, Al line being first added in LF refining furnace and completes molten steel deep deoxidation, by molten steel
Oxygen content is down within 20ppm, then CaC2 powder 1.2kg/t, CaSi powder 0.8kg/t, diffusive deoxidation is added in ladle top slag face.With
LF refining furnace enters the Conventional process steps such as subsequent refining desulfuration, deoxidation afterwards.
It should be noted that molten steel, which entered the station to the dephosphorization phase, not to be allowed to add any deoxidier, alloy, core-spun yarn.
It is sampled after stirring, ladle w (P) %:0.030%.
The phosphorus content that enters the station, outbound phosphorus content and the dephosphorization rate being calculated of comparative example 1 ~ 3, refer to table
1, shallow dephosphorization is refined through LF furnace, the phosphorus content that can will enter the station reduces by 5 ~ 6 percentage points, and dephosphorization rate is 14 ~ 16%, meets steel grade melting P
The standard requirements of ingredient, dephosphorization effect are good.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (10)
1. a kind of the step of shallow dephosphorization method of refining of the LF furnace of process for making, the process for making includes: blast furnace molten iron → converter
Smelt dephosphorization → Argon → LF furnace refining desulfuration → RH application of vacuum → continuous casting, it is characterised in that: the shallow dephosphorization refining of LF furnace
Method is that it is shallow to carry out the refining of LF furnace after the converter smelting deep dephosphorization step and before the LF furnace refining desulfuration step
Dephosphorization treatment specifically comprises the following steps:
1) it oxygen blast Argon: after molten steel enters LF furnace, connects ladle bottom blowing tracheae and carries out the operation of oxygen blast Argon, first oxygen blast to oxygen content
Saturation, it is rear to switch argon gas source Argon and refining process whole process furnace bottom Argon；
2) power transmission slugging: the converter terminal slag charge being crushed after ore, fluorite and natural cooling is added into LF furnace, power transmission is extremely
Clinkerization is saturating, and controls molten steel in furnace and the content of FeO in LF furnace is improved, to create the environmental condition of dephosphorization in alkalinity；
3) shallow dephosphorization: clinkerization has a power failure afterwards thoroughly, increases furnace bottom argon blowing rate, and stir using atm number, whipping process supplement adds
Enter converter terminal slag charge, ore and fluorite, shallow dephosphorization phosphorus content into molten steel is w (P) %≤0.030%；
4) it prevents rephosphorization: the alkaline environment in 1.5~2kg/t of lime holding LF furnace being added after the completion of dephosphorization, to prevent non-return phosphorus.
2. a kind of shallow dephosphorization method of refining of the LF furnace of process for making according to claim 1, it is characterised in that: the oxygen blast
Switch argon gas source Argon in Argon step after 40 ~ 50s of oxygen blast, and oxygen blast flow is 400NL/min, argon blowing rate 300NL/
min。
3. a kind of shallow dephosphorization method of refining of the LF furnace of process for making according to claim 1, it is characterised in that: the power transmission
In slugging step, the main component of the converter terminal slag charge is: CaO:45~49%；FeO:14~20%, MgO:9~12%,
SiO2:15-20%；Cr2O3: 1-2%；Remaining is the compound of iron, and the dosage of the converter terminal slag charge is 9 ~ 10kg/t.
4. a kind of shallow dephosphorization method of refining of the LF furnace of process for making according to claim 1, it is characterised in that: the power transmission
In slugging step, the dosage of the ore is 1.5 ~ 2.8kg/t, and the dosage of the fluorite is 1.5 ~ 2.5kg/t.
5. a kind of shallow dephosphorization method of refining of the LF furnace of process for making according to claim 1, it is characterised in that: described shallow de-
In phosphorus step, the argon blowing rate is 800 ~ 850NL/min, and the atm number mixing time is 10 ~ 15min.
6. a kind of shallow dephosphorization method of refining of the LF furnace of process for making according to claim 1, it is characterised in that: described shallow de-
In phosphorus step, the dosage of the converter terminal slag charge is 1 ~ 1.5kg/t, and the dosage of the ore is 1 ~ 1.5kg/t, the fluorite
Dosage be 0.8 ~ 1.2kg/t.
7. a kind of shallow dephosphorization method of refining of the LF furnace of process for making according to claim 1, it is characterised in that: described to prevent
It further include that Al line is first added in LF furnace and completes molten steel deep deoxidation, by Oxygen Content in Liquid Steel after the completion of dephosphorization after the step of rephosphorization
It is down within 20ppm, then CaC2 powder, CaSi powder diffusive deoxidation is added in ladle top slag face.
8. a kind of shallow dephosphorization method of refining of the LF furnace of process for making according to claim 7, it is characterised in that: the Al line
Additional amount is 1.2~2.8kg/t.
9. a kind of shallow dephosphorization method of refining of the LF furnace of process for making according to claim 7, it is characterised in that: the CaC2
The additional amount of powder is 0.8 ~ 1.2kg/t, and the additional amount of the CaSi powder is 0.4 ~ 0.8kg/t.
10. a kind of shallow dephosphorization method of refining of the LF furnace of process for making according to claim 7, it is characterised in that: described to blow
Before the step of oxygen Argon further include: weak deoxidation: the high carbon ferromanganese of Mn content 60 ~ 65% being added in converter argon-station tapping process
The weak deoxidation of deoxidier, additional amount is 0.2 ~ 0.4kg/t, and keeps oxygen content in 400 ~ 800ppm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112195309A (en) * | 2020-08-26 | 2021-01-08 | 鞍钢集团工程技术有限公司 | LF furnace smelting process with deep dephosphorization function |
| CN113061687A (en) * | 2019-12-30 | 2021-07-02 | 王虎 | Online pretreatment process for electric arc furnace slag |
| CN113652523A (en) * | 2021-08-17 | 2021-11-16 | 莱芜钢铁集团银山型钢有限公司 | Method for dephosphorizing molten steel in LF refining process |
| CN115433800A (en) * | 2021-10-08 | 2022-12-06 | 武汉山诚环保科技有限公司 | External refining process and application thereof |
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| CN105039647A (en) * | 2015-06-23 | 2015-11-11 | 武汉钢铁(集团)公司 | LF furnace shallow dephosphorization refining method |
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| CN105039647A (en) * | 2015-06-23 | 2015-11-11 | 武汉钢铁(集团)公司 | LF furnace shallow dephosphorization refining method |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113061687A (en) * | 2019-12-30 | 2021-07-02 | 王虎 | Online pretreatment process for electric arc furnace slag |
| CN112195309A (en) * | 2020-08-26 | 2021-01-08 | 鞍钢集团工程技术有限公司 | LF furnace smelting process with deep dephosphorization function |
| CN113652523A (en) * | 2021-08-17 | 2021-11-16 | 莱芜钢铁集团银山型钢有限公司 | Method for dephosphorizing molten steel in LF refining process |
| CN113652523B (en) * | 2021-08-17 | 2022-11-15 | 莱芜钢铁集团银山型钢有限公司 | Method for dephosphorizing molten steel in LF refining process |
| CN115433800A (en) * | 2021-10-08 | 2022-12-06 | 武汉山诚环保科技有限公司 | External refining process and application thereof |
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