CN105950826A - Deoxidizer for refining lag of ladle refining furnace and application method thereof - Google Patents
Deoxidizer for refining lag of ladle refining furnace and application method thereof Download PDFInfo
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- CN105950826A CN105950826A CN201610292807.6A CN201610292807A CN105950826A CN 105950826 A CN105950826 A CN 105950826A CN 201610292807 A CN201610292807 A CN 201610292807A CN 105950826 A CN105950826 A CN 105950826A
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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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Abstract
The invention provides a deoxidizer for refining slag of a ladle refining furnace and an application method thereof. The deoxidizer for the refining slag comprises, by mass, 10%-30% of CaCO3, 30%-60% of Al2O3, 10%-35% of Al and 0-5% of the balance. By adding the deoxidizer for the refining slag into the ladle refining furnace in the slag making process, the refining slag has the high desulfurization capacity and the high slag inclusion adsorption capacity, and after slag making is conducted, TFe and MnO are smaller than 1%. By means of the application method provided by the invention, the effect that using of aluminum particles is eliminated on the basis that the refining effect of the ladle refining furnace is not reduced can be ensured, the cost is substantially reduced, and existing technology parameters do not need to be changed at all.
Description
Technical field
The invention belongs to low cost refining techniques field, particularly to a kind of ladle refining furnace refine of low cost
Slag deoxidizer and using method thereof.
Background technology
The raising day by day required steel product quality along with user, (Ladle Furnace is called for short LF to ladle refining furnace
Stove) developed rapidly as the means improved Cleanliness of Molten Steel, promote steel product quality, the most become modern
Change iron and steel and produce indispensable one procedure in short route.LF refining furnace adds except using reducing atmosphere submerged arc
Outside the Secondary Refining Technology that heat, vacuum outgas, air brick Argon stirring etc. are more ripe, also introduce synthetic slag
Refining techniques, to reach desulfurization, the deoxidation even purpose of denitrogenation by rational slagging process, thus effectively
Absorbing the field trash in steel, control the form of field trash, the foamed slag that additionally available steel-making is formed floods
Electric arc, improves the thermal efficiency, reduces refractory corrosion.Thus in LF stove refinery practice, use reasonably
Slagging process plays vital effect to the improvement of Cleanliness of Molten Steel.
Such as, general furnaceman's LF process flow is as follows: top end converter, slag-stopping tapping (omnidistance Argon), Argon station,
Argon, thermometric, determines oxygen, sampling, feeds aluminum steel, thermometric, determines oxygen, sampling, and ladle handling is to LF stove refine
Stand on buggy ladle, enter and prepare position, thermometric, pre-Argon, ladle enters to add thermal potential, heating, slag making, furnishing part,
Oxygen, line feeding, soft blow argon (feeding calcium iron wire or silicon-calcium wire) are determined in sampling, thermometric, add heat preserving agent, continuous casting.
LF stove refine mainly by the white slag in bucket, (oxygen content is 5%), Argon in bucket in the atmosphere of hypoxia
Gas is stirred and is heated the molten steel through first furnace and refine by graphite electrode.Owing to argon stirring accelerates
Chemical reaction between slag one steel, carries out temperature-compensating by electric arc heated, it is ensured that during the refine of long period
Between, thus the oxygen in steel, sulfur content can be made to reduce.
The core technology of LF refine is exactly slag refine, it is desirable to refining slag has the following characteristics that (1) high reproducibility；
(2) high fluidity；(3) high sulfur capacity.The highest reproducibility is mainly come by deoxidizers such as addition aluminum shots
Arriving, be commonly called as " making white slag ", its smelting cost is limited by deoxidizer cost；High fluidity is mainly by adding
Entering fluorite to regulate, increasing producer was adjusted, high sulfur capacity by slag ingredient (calcium aluminum ratio) in recent years
Amount is typically by improving the basicity (CaO/SiO of refining slag2) realize.
At present, the deoxidizer of LF refining slag is mainly aluminum shot, and it is excellent that it has, and deoxidation is rapid, slag ingredient is stable
Point, but a disadvantage is that slag making is relatively costly.The most also have and several researchers have proposed new deoxidizer, such as aluminum
Slag making deoxidizing ball (patent CN1410557), ladle top slag deoxidation modification agent (patent CN103374642A)
Deng, but mostly have that slag making effect is unstable or cost reduces the problems such as inconspicuous.In general, slag making
Rear slag color represents that deoxidation is the most thorough the most in vain, thinks that TFe+MnO < 1% is slag making success in slag in industry.
At present, steel industry situation is the severeest, and major part iron company is in slight diarrhea or loss situation.For
Raising product competitiveness, seeks survival and development in severe winter under situation, on the one hand require that iron and steel enterprise externally opens up
Market obtains profit, on the other hand requires that it internally improves quality and reduces cost.
Summary of the invention
For the problems referred to above of the prior art, the invention provides a kind of ladle refining furnace refining slag deoxidizer and
Its using method, by adding ladle refining furnace of the present invention (LF) refining slag deoxidation in LF stove slagging process
Agent so that refining slag has the ability of higher desulfurization and dross inclusion adsorption, and TFe+MnO < 1% after slag making；
Described using method can ensure that on the basis of LF refining effect does not reduces, and cancels the use of aluminum shot, cost
It is greatly lowered, and without existing technological parameter is carried out any transformation.
In order to achieve the above object, the present invention adopts the following technical scheme that a kind of ladle refining furnace refining slag deoxidation
Agent, including following component: CaCO3: 10～30%, Al2O3: 30～60%, Al:10～35%, other:
≤ 5%, it is mass percent.CaCO3Component has the effect of the fusing point reducing composite slag.
As the most preferably, described ladle refining furnace refining slag deoxidizer granularity is 20～60mm.
As the most preferred, described ladle refining furnace refining slag deoxidizer, including following component: Calx:
20%, Al2O3: 52%, Al:25%, other: 3%, it is mass percent, described deoxidizer granularity
For 40mm.
A kind of using method of ladle refining furnace refining slag deoxidizer, described using method includes:
A, LF enter the station pre-Argon, thermometric；
B, to electrifying electrodes, the break starting the arc；Heat up and ladle surface skull is heated to running down state；
C, be dividedly in some parts synthesis slag charge, granule white lime, period add appropriate above-mentioned LF refining slag deoxidizer；
When being dividedly in some parts synthesis slag charge, granule white lime, at will which batch adds together；
D, secondary give electricity, and liquid steel temperature is brought up to particular range, ensure that surface slag charge dissolves completely simultaneously；
Described surface refers to ladle upper surface, and the density causing slag is less than molten steel, so slag all floats over table on ladle
Face；
E, adjustment ladle bottom blowing flow, stirring molten steel promotes slag-metal reaction, and this is the slag-metal reaction phase；
F, adjustment ladle bottom blowing flow, carry out Calcium treatment operation；
G, adjustment ladle bottom blowing flow, carry out soft blow operation until process terminates.
Molten steel is mainly heated by LF refine by electrode, and electrode inserts in slag, after energising, electrode with
Top slag begins with electric arc and produces, and is called the starting the arc；Gradually the preferable shape of mobility is become from thick after slag is heated
State, is called break.
Soft blow operation i.e. ladle, after completing all refining operations, only carries out temperature, composition by ladle bottom blowing equal
An even process.
As further preferably, in step A, described ladle refining furnace enters the station pre-Argon 1-3min.
As the most preferably, in step B, ladle surface skull is heated to molten state tool by described intensification
Body is: after intensification 1-2min, ladle surface skull is heated to running down state.
As the most preferably, in step C, every crowd of slag charge addition≤1500kg, between adjacent two batch of materials
Interval time is >=1min.
As the most preferably, in step C, it is dividedly in some parts synthesis slag charge, granule white lime, in a lot
Add appropriate above-mentioned LF refining slag deoxidizer.
As the most preferably, in step C, according to slag condition, fluorite can be added and adjust slag fluidity, firefly
Masonry is a kind of flux, can play the purpose of rapid slagging.
As the most preferably, in step C, the amount adding fluorite is 100～250kg/ ton steel.
As the most preferably, in step C, the amount adding LF refining slag deoxidizer is 300～500kg/ tons
Steel.
As the most preferably, in step D, liquid steel temperature is improved to more than 1575 DEG C.
As the most preferably, in step E, described ladle bottom blowing flow set is
1000～1200Nl/min, the time is 5～10min.
As the most preferably, in step F, described ladle bottom blowing flow set is 200～400Nl/min,
Feeding calcium line amount 300～400m/ ton steel.
As the most preferably, in step G, described ladle bottom blowing flow set is 50～100Nl/min,
Time is 5～10min.
During different disposal such as: during step E slag-metal reaction, during step F Calcium treatment and step G
During soft blow, the application uses different argon flow amounts.
As the most preferably, after above-mentioned steps, slag making, TFe+MnO content is 0.4-0.7%,
Slag color is white.
As the most preferably, other alloy additions are identical with prior art, according to different steel grade chemistry
Component requirements is from Row sum-equal matrix, and adding period can be in step D or E.Such as can be sequentially added into ferrosilicon, Si-Ca-Ba,
High carbon ferromanganese, carries out deoxidation alloying, and respective addition is: high carbon ferromanganese 7.1～9.4kg/ ton
Steel, Si-Ca-Ba 2.0～2.5kg/ ton steel, ferrosilicon 2.5～23.5kg/ ton steel.Described fluorite, silicon
Ferrum, Si-Ca-Ba, high carbon ferromanganese are commercial products.
Beneficial effects of the present invention is as follows:
1, ladle refining furnace refining slag deoxidizer of the present invention is applicable to the steel grade that any available LF technique produces, as
Pipe line steel, wheel steel etc..
2, after using ladle refining furnace refining slag deoxidizer slag making of the present invention, TFe+MnO < 1%, slag making becomes
Merit.
3, during using ladle refining furnace refining slag deoxidizer slag making of the present invention, simple to operate, it is not necessary to right
Existing technological parameter carries out any transformation.
4, using method of the present invention is while ensureing ladle refining furnace refining effect, and cost is greatly lowered,
Certain factory domestic uses after using method of the present invention, and ladle refining furnace refining cost reduces ton steel 2.5 yuan, year benefit
Up to 5,500,000 yuan.Industrialization promotion can be realized.
Accompanying drawing explanation
Fig. 1 is the using method flow chart of the embodiment of the present application ladle refining furnace refining slag deoxidizer.
Detailed description of the invention
The application, by providing a kind of ladle refining furnace refining slag deoxidizer and the using method thereof of low cost, passes through
Ladle refining furnace refining slag deoxidizer of the present invention is added so that refining slag has higher in LF slagging process
Desulfurization and the ability of dross inclusion adsorption.Described method can ensure that at the base that ladle refining furnace refining effect does not reduces
On plinth, cancelling the use of aluminum shot, cost is greatly lowered, and without existing technological parameter is carried out any transformation.
In order to be better understood from technique scheme, below in conjunction with Figure of description and specific embodiment
Technique scheme is described in detail.
The embodiment of the present application low cost LF refining slag deoxidizer, including following component: CaCO3(Calx):
10～30%, Al2O3: 30～60%, Al:10～35%, other :≤5%, it is mass percent.
Described LF refining slag deoxidizer granularity is 20～60mm.
LF refining slag deoxidizer embodiment 1: include following component: CaCO3: 10%, Al2O3: 50%,
Al:35%, other: 5%, it is mass percent, described deoxidizer granularity is 30mm.
LF refining slag deoxidizer embodiment 2: include following component: CaCO3: 20%, Al2O3: 52%,
Al:25%, other: 3%, it is mass percent, described deoxidizer granularity is 40mm.
LF refining slag deoxidizer embodiment 3: include following component: CaCO3: 30%, Al2O3: 40%,
Al:28%, other: 2%, it is mass percent, described deoxidizer granularity is 60mm.
The using method of the embodiment of the present application above-mentioned low cost LF refining slag deoxidizer, comprises the steps:
A, LF enter the station pre-Argon, and thermometric samples；
B, to electrifying electrodes, the break starting the arc；Heat up and ladle surface skull is heated to running down state；
C, be dividedly in some parts synthesis slag charge, granule white lime, add in a lot appropriate above-mentioned LF refining slag take off
Oxygen agent；
Liquid steel temperature, to electrifying electrodes, is brought up to particular range by D, secondary, ensures ladle upper surface slag simultaneously
Material dissolves completely；
E, adjustment ladle bottom blowing flow, stirring molten steel promotes slag-metal reaction, and this is the slag-metal reaction phase；
F, adjustment ladle bottom blowing flow, carry out Calcium treatment operation；
G, adjustment ladle bottom blowing flow, carry out soft blow operation until process terminates.
Wherein,
In step A, pre-Argon 1-3min.
In step B, ladle surface skull is heated to running down state by intensification 1-2min.
In step C, every crowd of slag charge addition≤1500kg, interval time >=1min between adjacent two batch of materials.
In step C, according to slag condition, fluorite can be added and adjust slag fluidity, fluorite as a kind of flux,
The purpose of rapid slagging can be played.
In step C, the amount adding fluorite is 100～250kg/ ton steel.
In step C, the amount adding LF refining slag deoxidizer is 300～500kg/ ton steel.
In step D, liquid steel temperature is improved to more than 1575 DEG C.
In step E, described bottom blowing flow set is 1000～1200Nl/min, and the time is 5～10min.
In step F, described bottom blowing flow set is 200～400Nl/min, feeds calcium line amount 300～400m/
Ton steel.
In step G, described bottom blowing flow set is 50～100Nl/min, and the time is 5～10min.
Argon bottom-blowing stirring is the principal element affecting LF rate of sulphur expulsion.The effect of stirring essentially consists in and can improve
Mass tranfer coefficient, expands slag-steel contact area, and can promote inclusion floating, and then improves desulphurizing ability.
Certainly, if Argon amount is too big, slag blanket fluctuation can be caused too big, even molten steel is exposed, thus causes secondary oxygen
Change, have a strong impact on desulfurized effect；The strongest stirring is the most unfavorable to desulfurization, can improve molten steel oxygen position,
Reduce the distribution of slag steel sulfur balance.
During different disposal such as: during step E slag-metal reaction, during step F Calcium treatment and step G
During soft blow, the embodiment of the present application uses different argon flow amounts.
Other alloy additions are identical with prior art, require from Row sum-equal matrix according to different steel grade chemical compositions,
Addition period can be in step D or E.Such as can be sequentially added into ferrosilicon, Si-Ca-Ba, high carbon ferromanganese, carry out deoxidation
Alloying, and respective addition is: high carbon ferromanganese 7.1～9.4kg/ ton steel, Si-Ca-Ba 2.0～
2.5kg/ ton steel, ferrosilicon 2.5～23.5kg/ ton steel.Described Calx, ferrosilicon, Si-Ca-Ba, high-carbon manganese
Ferrum is commercial products.
" 300t bessemerizes (half calm tapping) → 300t in the embodiment of the present application method certain large-scale steel mill at home
The cast of LF refine → continuously " have been realized in commercial introduction, as a example by 3 stove typical case's heats in technological process.
Test heat 1:LF enters the station pre-Argon 3min, adds slag charge 2.1t after changing slag in two batches, is spaced 1.5min；
It is subsequently added fluorite 200kg, refining slag deoxidizer 350kg；It is warming up to 1577 DEG C to electrifying electrodes；Adjust
Ladle bottom blowing flow is to 1000Nl/min, and the time is 10min；Adjust ladle bottom blowing flow to 300Nl/min,
Feeding calcium line amount 320m；Adjustment ladle bottom blowing flow, to 50Nl/min, carries out soft blow operation until processing knot
Bundle.After this heat slag making, TFe+MnO is 0.7%；Slag color is white.
Test heat 2:LF enters the station pre-Argon 3min, adds slag charge 1.8t after changing slag in two batches, is spaced 1.5min；
It is subsequently added fluorite 100kg, refining slag deoxidizer 370kg；It is warming up to 1581 DEG C to electrifying electrodes；Adjust
Ladle bottom blowing flow is to 1000Nl/min, and the time is 7min；Adjust ladle bottom blowing flow to 300Nl/min,
Feeding calcium line amount 280m；Adjustment ladle bottom blowing flow, to 50Nl/min, carries out soft blow operation until processing knot
Bundle.After this heat slag making, TFe+MnO is 0.6%；Slag color is white.
Test heat 3:LF enters the station pre-Argon 3min, adds slag charge 1.9t after changing slag in two batches, is spaced 1.5min；
It is subsequently added fluorite 240kg, refining slag deoxidizer 310kg；It is warming up to 1579 DEG C to electrifying electrodes；Adjust
Ladle bottom blowing flow is to 1200Nl/min, and the time is 6min；Adjust ladle bottom blowing flow to 400Nl/min,
Feeding calcium line amount 380m；Adjustment ladle bottom blowing flow, to 50Nl/min, carries out soft blow operation until processing knot
Bundle.After this heat slag making, TFe+MnO is 0.4%；Slag color is white.
Technical scheme in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage:
1, the embodiment of the present application LF refining slag deoxidizer is applicable to the steel grade that any available LF technique produces, as
Pipe line steel, wheel steel etc..
2, after using the refining slag deoxidizer slag making of the embodiment of the present application LF, TFe+MnO < 1%, slag making success.
3, during using the refining slag deoxidizer slag making of the embodiment of the present application LF, simple to operate, it is not necessary to existing
Technological parameter is had to carry out any transformation.
4, the embodiment of the present application using method is while ensureing LF refining effect, and cost is greatly lowered, state
In after certain factory uses the embodiment of the present application using method, LF refining cost reduces ton steel 2.5 yuan, year benefit can
Reach 5,500,000 yuan, industrialization promotion can be realized.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know substantially
Creative concept, then can make other change and amendment to these embodiments.So, claims are anticipated
It is intended to be construed to include preferred embodiment and fall into all changes and the amendment of the scope of the invention.Obviously, this area
Technical staff the present invention can be carried out various change and modification without departing from the spirit and scope of the present invention.This
Sample, if the present invention these amendment and modification belong to the claims in the present invention and equivalent technologies thereof scope it
In, then the present invention is also intended to comprise these change and modification.
Claims (10)
1. a ladle refining furnace refining slag deoxidizer, it is characterised in that: the composition of described refining slag deoxidizer
Percentage ratio includes: CaCO3: 10～30%, Al2O3: 30～60%, Al:10～35%, other :≤5%,
It is calculated in mass percent；Described refining slag deoxidizer granularity is 20～60mm.
2. a using method for the refining slag deoxidizer of ladle refining furnace as claimed in claim 1, its feature
It is: described using method includes:
A, ladle refining furnace enter the station pre-Argon, thermometric；
B, to electrifying electrodes, the break starting the arc；Heat up and ladle surface skull is heated to molten state；
C, be dividedly in some parts synthesis slag charge, granule white lime, batch adds described refining slag deoxidizer；
Liquid steel temperature, to electrifying electrodes, is improved by D, secondary, ensures that ladle upper surface slag charge dissolves simultaneously；
E, adjustment ladle bottom blowing flow, stirring molten steel promotes slag-metal reaction；
F, adjustment ladle bottom blowing flow, carry out Calcium treatment operation；
G, adjustment ladle bottom blowing flow, carry out soft blow operation.
The using method of ladle refining furnace refining slag deoxidizer the most according to claim 2, it is characterised in that:
In step A, described ladle refining furnace enters the station pre-Argon 1-3min, and in step B, described intensification is by ladle table
Face skull is heated to molten state particularly as follows: ladle surface skull is heated to running down shape after intensification 1-2min
State.
The using method of ladle refining furnace refining slag deoxidizer the most according to claim 2, it is characterised in that:
In step C, described in be dividedly in some parts synthesis slag charge, granule white lime time, every crowd of slag charge addition≤1500kg, phase
Adjacent interval time >=the 1min between two batch of materials.
The using method of ladle refining furnace refining slag deoxidizer the most according to claim 2, it is characterised in that:
In step C, described be dividedly in some parts synthesis slag charge, granule white lime time, described method also includes: add fluorite,
The amount of described fluorite is 100～250kg/ ton steel.
The using method of ladle refining furnace refining slag deoxidizer the most according to claim 2, it is characterised in that:
In step C, the amount of described addition described refining slag deoxidizer is 300～500kg/ ton steel.
The using method of ladle refining furnace refining slag deoxidizer the most according to claim 2, it is characterised in that:
In step E, described ladle bottom blowing flow set is 1000～1200Nl/min, and the time is 5～10min.
The using method of ladle refining furnace refining slag deoxidizer the most according to claim 2, it is characterised in that:
In step F, described ladle bottom blowing flow set is 200～400Nl/min, feeds calcium line amount 300～400m/
Ton steel.
The using method of ladle refining furnace refining slag deoxidizer the most according to claim 2, it is characterised in that:
In step G, described ladle bottom blowing flow set is 50～100Nl/min, and the time is 5～10min.
The most according to claim 2, the using method of ladle refining furnace refining slag deoxidizer, its feature exists
In: after using described using method slag making, TFe+MnO content is 0.4-0.7%, and slag color is white.
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| CN108018398A (en) * | 2016-10-28 | 2018-05-11 | 上海梅山钢铁股份有限公司 | A kind of ladle top slag for ultra-low-carbon steel deoxidation modification agent and its application method |
| CN108504820A (en) * | 2018-04-28 | 2018-09-07 | 河钢股份有限公司承德分公司 | A kind of LF refining method of Aluminum steel |
| CN111893248A (en) * | 2020-09-07 | 2020-11-06 | 攀钢集团攀枝花钢钒有限公司 | Refining slagging agent and preparation method and use method thereof |
| CN114182063A (en) * | 2021-12-13 | 2022-03-15 | 商丘市商鼎耐火材料有限公司 | Use method of deoxidizer for refining and using aluminum ash as raw material |
| CN115061522A (en) * | 2022-05-25 | 2022-09-16 | 广东韶钢松山股份有限公司 | LF temperature control method |
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| CN108504820A (en) * | 2018-04-28 | 2018-09-07 | 河钢股份有限公司承德分公司 | A kind of LF refining method of Aluminum steel |
| CN111893248A (en) * | 2020-09-07 | 2020-11-06 | 攀钢集团攀枝花钢钒有限公司 | Refining slagging agent and preparation method and use method thereof |
| CN114182063A (en) * | 2021-12-13 | 2022-03-15 | 商丘市商鼎耐火材料有限公司 | Use method of deoxidizer for refining and using aluminum ash as raw material |
| CN115061522A (en) * | 2022-05-25 | 2022-09-16 | 广东韶钢松山股份有限公司 | LF temperature control method |
| CN115061522B (en) * | 2022-05-25 | 2024-04-02 | 广东韶钢松山股份有限公司 | LF temperature control method |
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