CN105950826B - A kind of ladle refining furnace refining slag deoxidier and its application method - Google Patents
A kind of ladle refining furnace refining slag deoxidier and its application method Download PDFInfo
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- CN105950826B CN105950826B CN201610292807.6A CN201610292807A CN105950826B CN 105950826 B CN105950826 B CN 105950826B CN 201610292807 A CN201610292807 A CN 201610292807A CN 105950826 B CN105950826 B CN 105950826B
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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 present invention provides a kind of ladle refining furnace refining slag deoxidier and its application method, the refining slag deoxidier includes following component：CaCO3：10~30%, Al2O3：30~60%, Al：10~35%, it is other：≤ 5%, it is mass percent.By the way that refining slag deoxidier of the present invention is added in ladle refining furnace slagging process so that refining slag has the ability of higher desulfurization and dross inclusion adsorption, and TFe+MnO ＜ 1% after slag making.Application method of the present invention can ensure on the basis of ladle refining furnace refining effect does not reduce, to cancel the use of aluminum shot, and cost is greatly lowered, without carrying out any transformation to prior art parameter.
Description
Technical field
The invention belongs to inexpensive refining techniques fields, more particularly to a kind of ladle refining furnace refining slag of low cost is de-
Oxygen agent and its application method.
Background technology
With the increasingly raising that user requires steel product quality, ladle refining furnace (Ladle Furnace abbreviation LF stoves) is made
Means to improve Cleanliness of Molten Steel, promotion steel product quality are rapidly developed, and are had become modernization steel at present and are produced short stream
An indispensable procedure in journey.LF refining furnace using the heating of reducing atmosphere submerged arc, vacuum outgas, air brick Argon in addition to being stirred
It mixes etc. outside more mature Secondary Refining Technology, refining with synthetic flux technology is also introduced, to be reached by rational slagging process
The form of field trash is controlled, additionally may be used to effectively absorb the field trash in steel to desulfurization, the deoxidation even purpose of denitrogenation
It is formed by foamed slag using steel-making and floods electric arc, improve the thermal efficiency, reduces refractory material and corrode.Thus in LF stove refinery practices
In, the improvement of Cleanliness of Molten Steel is played a crucial role using rational slagging process.
For example, general LF furnace technology flows are as follows：Push up bottom converter, slag-stopping tapping (whole Argon), Argon station, Argon, survey
Temperature determines oxygen, sampling, feeds aluminum steel, and thermometric determines oxygen, samples, and in ladle handling to LF stove refining station buggy ladles, into position is prepared, surveys
Temperature, pre- Argon, ladle, which enters, heats position, and heating, slag making are tuned into part, and oxygen determine in sampling, thermometric, line feeding, soft blow argon (hello calcium iron wire or
Silicon-calcium wire), add heat preserving agent, continuous casting.
LF stoves are refined mainly by the white slag in bucket, and in the atmosphere of hypoxemia (oxygen content 5%), into bucket, blowing argon gas carries out
It stirs and the molten steel by first furnace is heated by graphite electrode and refined.Since argon gas stirring accelerates the change between one steel of slag
Reaction is learned, temperature-compensating is carried out with electric arc heated, it is ensured that the refining time of long period, so as to make oxygen, the sulphur in steel
Content reduces.
The core technology of LF refining is exactly slag refining, it is desirable that refining slag has the characteristics that：(1) high reproducibility；(2) high
Mobility；(3) high sulfur capacity.Wherein high reproducibility is mainly obtained by the way that the deoxidiers such as aluminum shot are added, and is commonly called as " making white slag ",
Its smelting cost is limited by deoxidier cost；High fluidity is mainly adjusted by the way that fluorite is added, more and more in recent years
Producer be adjusted by slag ingredient (calcium aluminium ratio), high sulfur capacity generally pass through improve refining slag basicity (CaO/SiO2) come
It realizes.
Currently, the deoxidier of LF refining slag is mainly aluminum shot, it has the advantages that, and deoxidation is rapid, slag ingredient is stablized, still
The disadvantage is that slag making cost is higher.New deoxidier is proposed there are also researcher in recent years, such as Aluminium slagging deoxygen ball (patent
CN1410557), ladle top slag deoxidation modification agent (patent CN103374642A) etc., but it is unstable mostly to there is slag making effect
Or the problems such as cost reduction unobvious.In general, the whiter expression deoxidation of slag color is more thorough after slag making, and slag is thought in industry
Middle TFe+MnO<1% is slag making success.
Currently, steel industry situation is extremely severe, most of iron company is in meagre profit or loss situation.In order to improve
Product competitiveness, seeks survival and development under severe winter situation, on the one hand requires iron and steel enterprise externally to exploit market and obtains profit, separately
On the one hand requiring it internally to improve quality reduces cost.
Invention content
For the above problem in the prior art, the present invention provides a kind of ladle refining furnace refining slag deoxidier and its make
With method, pass through addition ladle refining furnace (LF) the refining slag deoxidier of the present invention in LF stove slagging processes so that refining slag has
There are the ability of higher desulfurization and dross inclusion adsorption, and TFe+MnO after slag making<1%；The application method can ensure in LF essences
On the basis of refining effect does not reduce, cancel the use of aluminum shot, cost is greatly lowered, and without appointing to prior art parameter
What is transformed.
In order to achieve the above object, the present invention adopts the following technical scheme that：A kind of ladle refining furnace refining slag deoxidier, packet
Include following component：CaCO3：10~30%, Al2O3：30~60%, Al：10~35%, it is other：≤ 5%, it is quality percentage
Number.CaCO3Component has the function of reducing the fusing point of composite slag.
As a further preference, the ladle refining furnace refining slag deoxidier granularity is 20~60mm.
As a further preference, the ladle refining furnace refining slag deoxidier, including following component：Lime：20%,
Al2O3：52%, Al：25%, other：3%, it is mass percent, the deoxidier granularity is 40mm.
A kind of application method of ladle refining furnace refining slag deoxidier, the application method include：
A, LF enters the station pre- Argon, thermometric；
B, it is powered to electrode, the break starting the arc；Ladle surface skull is heated to running down state by heating；
C, synthesis slag charge, granule lime is added portionwise, appropriate above-mentioned LF refining slag deoxidier is during which added；Conjunction is added portionwise
When at slag charge, granule lime, which careless batch is added together；
D, secondary to electricity, liquid steel temperature is increased to particular range, while ensureing that surface slag charge dissolves completely；The surface
It refers to ladle upper surface, causes the density ratio molten steel of slag small, so slag all floats on ladle upper surface；
E, ladle bottom blowing flow is adjusted, stirring molten steel promotes slag-metal reaction, this is the slag-metal reaction phase；
F, ladle bottom blowing flow is adjusted, Calcium treatment operation is carried out；
G, ladle bottom blowing flow is adjusted, carries out soft blow operation until processing terminates.
LF refining mainly heats molten steel by electrode, and electrode is inserted into slag, and after energization, electrode starts with top slag
There is electric arc generation, is called the starting the arc；Slag gradually becomes the preferable state of mobility after being heated from thick, is called break.
Soft blow operation i.e. ladle is only uniform into trip temperature, ingredient by ladle bottom blowing after completing all refining operations
One process.
As a further preference, in step A, the ladle refining furnace enters the station pre- Argon 1-3min.
As a further preference, in step B, ladle surface skull is heated to molten state and is specially by the heating：
Ladle surface skull is heated to running down state after heating 1-2min.
As a further preference, in step C, every batch of slag charge addition≤1500kg, when being spaced between adjacent two batch of material
Between for >=1min.
As a further preference, in step C, synthesis slag charge, granule lime is added portionwise, is added in a lot appropriate
Above-mentioned LF refining slag deoxidier.
As a further preference, in step C, according to slag condition, fluorite adjustment slag fluidity can be added, fluorite is as one
Kind fluxing agent, can play the purpose of rapid slagging.
As a further preference, in step C, the amount that fluorite is added is 100~250kg/ tons of steel.
As a further preference, in step C, the amount that LF refining slag deoxidier is added is 300~500kg/ tons of steel.
As a further preference, in step D, liquid steel temperature is improved to 1575 DEG C or more.
As a further preference, in step E, the ladle bottom blowing flow set is 1000~1200Nl/min, when
Between be 5~10min.
As a further preference, in step F, the ladle bottom blowing flow set is 200~400Nl/min, feeding
300~400m/ tons of steel of calcium line amount.
As a further preference, in step G, the ladle bottom blowing flow set is 50~100Nl/min, and the time is
5~10min.
During different disposal for example：During step E slag-metal reactions, during step F Calcium treatments and during step G soft blows,
The application uses different argon flow amounts.
As a further preference, by above-mentioned steps, TFe+MnO contents are 0.4-0.7% after slag making, and slag color is white
Color.
As a further preference, other alloy additions with it is identical in the prior art, according to different steel grade chemical compositions
It is required that voluntarily adjusting, the period of addition can be in step D or E.Such as ferrosilicon, Si-Ca-Ba, high carbon ferromanganese can be sequentially added, carry out deoxidation
Alloying, and respective addition is：7.1~9.4kg/ tons of steel of high carbon ferromanganese, 2.0~2.5kg/ tons of steel of Si-Ca-Ba, ferrosilicon 2.5
~23.5kg/ tons of steel.The fluorite, ferrosilicon, Si-Ca-Ba, high carbon ferromanganese are commercial products.
Beneficial effects of the present invention are as follows：
1, ladle refining furnace refining slag deoxidier of the present invention is suitable for the steel grade of any available LF technique productions, such as pipeline
Steel, wheel steel etc..
2, after using ladle refining furnace refining slag deoxidier slag making of the present invention, TFe+MnO<1%, slag making success.
3, easy to operate during using ladle refining furnace refining slag deoxidier slag making of the present invention, without to existing work
Skill parameter carries out any transformation.
4, while ensureing ladle refining furnace refining effect, cost is greatly lowered application method of the present invention, it is domestic certain
Factory is using after application method of the present invention, and ladle refining furnace refining cost reduces by 2.5 yuan of ton steel, and year, benefit was up to 5,500,000 yuan.It can be real
Existing industrialization promotion.
Description of the drawings
Fig. 1 is the application method flow chart of the embodiment of the present application ladle refining furnace refining slag deoxidier.
Specific implementation mode
The application is by providing a kind of ladle refining furnace refining slag deoxidier and its application method of low cost, by LF
Ladle refining furnace refining slag deoxidier of the present invention is added in slagging process so that there is refining slag higher desulfurization to be mingled with absorption
The ability of object.The method can ensure on the basis of ladle refining furnace refining effect does not reduce, to cancel the use of aluminum shot, at
Originally it is greatly lowered, and without carrying out any transformation to prior art parameter.
In order to better understand the above technical scheme, in conjunction with appended figures and specific embodiments to upper
Technical solution is stated to be described in detail.
The embodiment of the present application low cost LF refining slag deoxidier, including following component：CaCO3(lime)：10~30%,
Al2O3：30~60%, Al：10~35%, it is other：≤ 5%, it is mass percent.
The LF refining slag deoxidier granularity is 20~60mm.
LF refining slag deoxidier embodiment 1：Including following component：CaCO3：10%, Al2O3：50%, Al：35%, other：
5%, it is mass percent, the deoxidier granularity is 30mm.
LF refining slag deoxidier embodiment 2：Including following component：CaCO3：20%, Al2O3：52%, Al：25%, other：
3%, it is mass percent, the deoxidier granularity is 40mm.
LF refining slag deoxidier embodiment 3：Including following component：CaCO3：30%, Al2O3：40%, Al：28%, other：
2%, it is mass percent, the deoxidier granularity is 60mm.
The application method of the above-mentioned inexpensive LF refining slag deoxidier of the embodiment of the present application, includes the following steps：
A, LF enters the station pre- Argon, thermometric sampling；
B, it is powered to electrode, the break starting the arc；Ladle surface skull is heated to running down state by heating；
C, synthesis slag charge, granule lime is added portionwise, appropriate above-mentioned LF refining slag deoxidier is added in a lot；
D, secondary to be powered to electrode, liquid steel temperature is increased to particular range, while ensureing that ladle upper surface slag charge is complete
It dissolves；
E, ladle bottom blowing flow is adjusted, stirring molten steel promotes slag-metal reaction, this is the slag-metal reaction phase；
F, ladle bottom blowing flow is adjusted, Calcium treatment operation is carried out；
G, ladle bottom blowing flow is adjusted, carries out soft blow operation until processing terminates.
Wherein,
In step A, pre- Argon 1-3min.
In step B, ladle surface skull is heated to running down state by heating 1-2min.
In step C, every batch of slag charge addition≤1500kg, interval time >=1min between adjacent two batch of material.
In step C, according to slag condition, fluorite adjustment slag fluidity can be added, fluorite can play fast as a kind of fluxing agent
The purpose of rapid-result slag.
In step C, the amount that fluorite is added is 100~250kg/ tons of steel.
In step C, the amount that LF refining slag deoxidier is added is 300~500kg/ tons of steel.
In step D, liquid steel temperature is improved to 1575 DEG C or more.
In step E, the bottom blowing flow set is 1000~1200Nl/min, and the time is 5~10min.
In step F, the bottom blowing flow set is 200~400Nl/min, feeds 300~400m/ tons of steel of calcium line amount.
In step G, the bottom blowing flow set is 50~100Nl/min, and the time is 5~10min.
Argon bottom-blowing stirring is to influence the principal element of LF rates of sulphur expulsion.The effect of stirring, which essentially consists in, can improve mass transfer system
Number expands slag-steel contact area, and can promote inclusion floating, and then improves desulphurizing ability.Certainly, if Argon amount too
Greatly, the too big or even molten steel of slag blanket fluctuation can be caused exposed, to cause secondary oxidation, seriously affect desulfurization effect；It is same excessive
Strong stirring is also unfavorable to desulfurization, can improve molten steel oxygen position, reduces the distribution of slag steel sulfur balance.
During different disposal for example：During step E slag-metal reactions, during step F Calcium treatments and during step G soft blows,
The embodiment of the present application uses different argon flow amounts.
Other alloy additions with it is identical in the prior art, according to different steel grade chemical compositions require voluntarily adjust, be added
Period can be in step D or E.Such as ferrosilicon, Si-Ca-Ba, high carbon ferromanganese can be sequentially added, carry out deoxidation alloying, and it is respective plus
Entering amount is：2.5~23.5kg/ tons of 7.1~9.4kg/ tons of steel of high carbon ferromanganese, 2.0~2.5kg/ tons of steel of Si-Ca-Ba, ferrosilicon steel.Institute
It is commercial products to state lime, ferrosilicon, Si-Ca-Ba, high carbon ferromanganese.
" 300t bessemerizes (half calm tapping) → 300t LF essences to the embodiment of the present application method for certain large-scale steel mill at home
Commercial introduction is had been realized in refining → continuous cast " technological process, by taking 3 stove typical case's heats as an example.
Test heat 1：LF enters the station pre- Argon 3min, and slag charge 2.1t is added after slugging in two batches, is spaced 1.5min；Then add
Enter fluorite 200kg, refining slag deoxidier 350kg；It is warming up to 1577 DEG C to electrode energization；Adjust ladle bottom blowing flow extremely
1000Nl/min, time 10min；Ladle bottom blowing flow is adjusted to 300Nl/min, feeding calcium line amount 320m；Adjust Ladle Bottom
Wind drift amount carries out soft blow operation until processing terminates to 50Nl/min.TFe+MnO is 0.7% after the heat slag making；Slag color is
White.
Test heat 2：LF enters the station pre- Argon 3min, and slag charge 1.8t is added after slugging in two batches, is spaced 1.5min；Then add
Enter fluorite 100kg, refining slag deoxidier 370kg；It is warming up to 1581 DEG C to electrode energization；Adjust ladle bottom blowing flow extremely
1000Nl/min, time 7min；Ladle bottom blowing flow is adjusted to 300Nl/min, feeding calcium line amount 280m；Adjust ladle bottom blowing
Flow carries out soft blow operation until processing terminates to 50Nl/min.TFe+MnO is 0.6% after the heat slag making；Slag color is white
Color.
Test heat 3：LF enters the station pre- Argon 3min, and slag charge 1.9t is added after slugging in two batches, is spaced 1.5min；Then add
Enter fluorite 240kg, refining slag deoxidier 310kg；It is warming up to 1579 DEG C to electrode energization；Adjust ladle bottom blowing flow extremely
1200Nl/min, time 6min；Ladle bottom blowing flow is adjusted to 400Nl/min, feeding calcium line amount 380m；Adjust ladle bottom blowing
Flow carries out soft blow operation until processing terminates to 50Nl/min.TFe+MnO is 0.4% after the heat slag making；Slag color is white
Color.
Technical solution 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 deoxidier be suitable for any available LF technique productions steel grade, as pipe line steel,
Wheel steel etc..
2, after using the embodiment of the present application LF refining slag deoxidier slag making, TFe+MnO<1%, slag making success.
3, easy to operate during using the embodiment of the present application LF refining slag deoxidier slag making, without to prior art
Parameter carries out any transformation.
4, while ensureing LF refining effect, cost is greatly lowered the embodiment of the present application application method, certain domestic factory
After the embodiment of the present application application method, 2.5 yuan of LF refining cost reduction ton steel, year benefit up to 5,500,000 yuan, it can be achieved that work
Industryization is promoted.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.Obviously, those skilled in the art can be to the present invention
Carry out various modification and variations without departing from the spirit and scope of the present invention.If in this way, these modifications and changes of the present invention
Within the scope of the claims of the present invention and its equivalent technology, then the present invention is also intended to exist comprising these modification and variations
It is interior.
Claims (6)
1. a kind of application method of the refining slag deoxidier of ladle refining furnace, it is characterised in that：The group of the refining slag deoxidier
Include at percentage：CaCO3：10~30%, Al2O3：30~60%, Al：10~35%, it is other：≤ 5%, with mass percent
Meter；The refining slag deoxidier granularity is 20~60mm；The application method of the refining slag deoxidier includes：
A, ladle refining furnace enters the station pre- Argon, thermometric；
B, it is powered to electrode, the break starting the arc；Ladle surface skull is heated to molten state by heating；
C, synthesis slag charge, granule lime is added portionwise, the refining slag deoxidier is added in batch；
D, secondary to be powered to electrode, liquid steel temperature is improved, while ensureing the slag charge fusing of ladle upper surface；
E, ladle bottom blowing flow is adjusted, stirring molten steel promotes slag-metal reaction；The ladle bottom blowing flow set be 1000~
1200Nl/min, time are 5~10min；
F, ladle bottom blowing flow is adjusted, Calcium treatment operation is carried out；The ladle bottom blowing flow set is 200~400Nl/min,
Feed 300~400m/ tons of steel of calcium line amount；
G, ladle bottom blowing flow is adjusted, soft blow operation is carried out；The ladle bottom blowing flow set is 50~100Nl/min, when
Between be 5~10min.
2. the application method of the refining slag deoxidier of ladle refining furnace according to claim 1, it is characterised in that：In step A,
The ladle refining furnace enters the station pre- Argon 1-3min, and in step B, ladle surface skull is heated to molten state tool by the heating
Body is：Ladle surface skull is heated to running down state after heating 1-2min.
3. the application method of the refining slag deoxidier of ladle refining furnace according to claim 1, it is characterised in that：In step C,
It is described when synthesis slag charge, granule lime is added portionwise, every batch of slag charge addition≤1500kg, the interval between two adjacent batch of materials
Time >=1min.
4. the application method of the refining slag deoxidier of ladle refining furnace according to claim 1, it is characterised in that：In step C,
It is described be added portionwise synthesis slag charge, granule lime when, the method further includes：It is added fluorite, the amount of the fluorite is 100~
250kg/ tons of steel.
5. the application method of the refining slag deoxidier of ladle refining furnace according to claim 1, it is characterised in that：In step C,
The amount that the refining slag deoxidier is added is 300~500kg/ tons of steel.
6. the application method of the refining slag deoxidier of ladle refining furnace according to claim 1, it is characterised in that：Using described
TFe+MnO contents are 0.4-0.7% after application method slag making, 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 |
| CN114182063B (en) * | 2021-12-13 | 2023-03-17 | 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 |
| 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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| CN101503747B (en) * | 2009-03-12 | 2010-07-28 | 浙江杭美炉料制造有限公司 | Heating steel slag washing material for converter steel melting, preparation and use method |
| CN101629224A (en) * | 2009-08-04 | 2010-01-20 | 重庆科健冶金材料有限公司 | Deoxidation modification agent of molten steel |
| CN102181605A (en) * | 2011-04-07 | 2011-09-14 | 重庆钢铁(集团)有限责任公司 | Molten steel deoxidizing modifier |
| CN102747189A (en) * | 2012-07-25 | 2012-10-24 | 洛阳市科丰冶金新材料（集团）有限公司 | Composite refining slag for refining molten steel |
| CN102747190A (en) * | 2012-07-30 | 2012-10-24 | 重庆钢铁(集团)有限责任公司 | Deoxygenation modifier for molten steel |
| CN104278130A (en) * | 2014-09-23 | 2015-01-14 | 商洛学院 | Process of quickly regulating alkalinity of LF (ladle furnace) slag |
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