CN109554518A - A kind of rotary blowing purification molten steel deoxidier and its application method - Google Patents
A kind of rotary blowing purification molten steel deoxidier and its application method Download PDFInfo
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- CN109554518A CN109554518A CN201710890028.0A CN201710890028A CN109554518A CN 109554518 A CN109554518 A CN 109554518A CN 201710890028 A CN201710890028 A CN 201710890028A CN 109554518 A CN109554518 A CN 109554518A
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- deoxidier
- molten steel
- blowing
- steel
- ladle
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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
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The present invention relates to a kind of rotary blowing purification molten steel deoxidier and its application method, the deoxidier is made after being mixed by aluminium powder, calcium oxide and calcium carbonate；Its application method includes: 1) after converter tapping, and ladle enters deoxidier blowing station；Spray gun is inserted into the molten steel away from 300~500mm of ladle bottom and is blown；It is 1.5~2.2kg/ tons of steel that deoxidier, which is blown additional amount,；2) after all molten steel is added in deoxidier, deoxidation process terminates, and ladle 3~5min of soft argon blowing, then molten steel is transferred to subsequent processing.Prepared deoxidizing powder is sprayed into molten steel by spray gun by the present invention, has both solved the problems, such as that pulvis was difficult to enter molten steel, solves the problems, such as that deoxidation products is difficult to remove further through the Rational Composition proportion of deoxidier, and the duration of heat, operation is simple.
Description
Technical field
The present invention relates to steelmaking technical field more particularly to a kind of rotary blowing purification molten steel deoxidier and its users
Method.
Background technique
Always through STEELMAKING PRODUCTION, the mode of deoxidation of molten steel decides the final quality of steel to deoxidization technique.Conventional
Deoxidization technique is generally precipitation desoxydation, and the removing of oxygen is realized using the deoxidier of aluminium and silicomanganese etc.But silicon manganese dioxidation exists
Deoxidation be not thorough, aluminium deoxidation there is after deoxidation field trash difficulty removal the case where, especially to some ultra-low-carbon steels (such as IF steel
Deng) performance is more so.
When using ferro-aluminum deoxidier, the use aluminum amount of molten steel per ton is 800~1200g.In ferro-aluminum deoxidation process, if aluminium
Iron density is lower, floats to molten steel surface soon, useful effect can not occur with the molten steel in deep；As ferro-aluminum density compared with
Height is suspended in molten steel, then is easy to make in molten steel local aluminum concentration excessive, is easier to form the deoxidation products of bulky grain.
It is more about the improved technology of deoxidier both at home and abroad, but mainly studied from the following aspects: 1) change
Become deoxidier proportion, can suspend or be sunken to molten steel, improves deoxidation rate；2) deoxidier is made to certain shape,
Convenient for directly deoxidation can be carried out by " piercing " molten steel；3) some steelmaking processes, which are added, not to be influenced steel quality and can play deoxidation work
Element such as Ca, Sr, Re etc. are combined with bentonite, waterglass etc., are formed sphere and are facilitated access in steel and are reacted.
Pulvis blowing is mainly used in molten iron pretreatment desulfurizing, and domestic and international open source literature, which has no, carries out deoxidation of molten steel work with it
The report of skill.The present invention provides a kind of novel deoxidizer for use and novel method of deoxidation, can be improved the utilization efficiency of deoxidier,
The deoxidation products in deoxidation process is overcome to remove not clean situation simultaneously,
Summary of the invention
The present invention provides a kind of rotary blowing purification molten steel deoxidier and its application methods, by prepared deoxidier
Powder sprays into molten steel by spray gun, had both solved the problems, such as that pulvis was difficult to enter molten steel, and had matched further through the Rational Composition of deoxidier
Than solving the problems, such as that deoxidation products is difficult to remove, and the duration of heat, operation is simple.
In order to achieve the above object, the present invention is implemented with the following technical solutions:
A kind of rotary blowing purification molten steel deoxidier, the deoxidier are made after being mixed by aluminium powder, calcium oxide and calcium carbonate
At；On the basis of the total weight of deoxidier, the weight percent content of each component are as follows: aluminium powder 60~80%, calcium oxide 10~
25%, calcium carbonate 10~15%.
The granularity of the deoxidier is 0.1~0.5mm.
A kind of application method of rotary blowing purification molten steel deoxidier, includes the following steps:
1) after converter tapping, ladle enters deoxidier blowing station；Spray gun is inserted into away from 300~500mm of ladle bottom
Molten steel in be blown；Deoxidier is blown the time in 3min or more；It is 1.5~2.2kg/ tons of steel that deoxidier, which is blown additional amount,；
2) after all molten steel is added in deoxidier, deoxidation process terminates, and ladle 3~5min of soft argon blowing, then molten steel is transferred to down
One process.
Compared with prior art, the beneficial effects of the present invention are:
1) present invention solves pulvis using powder blowing method and is difficult to enter the problems in steel, passes through the reasonable of deoxidier
Composition proportion, while guaranteeing good deoxidation effect, deoxidation process forms calcium-aluminate and the bubble of Decomposition of Calcium Carbonate combines,
Molten steel can quickly be discharged, solve the problems, such as that common deoxidation products is difficult to remove；
2) deoxidier application method of the present invention is simple, without security risk, and can be used in all steel grades in converter
This link of deoxidation, application range are wider.
Specific embodiment
A kind of rotary blowing of the present invention purifies molten steel deoxidier, and the deoxidier is by aluminium powder, calcium oxide and carbonic acid
It is made after calcium mixing；On the basis of the total weight of deoxidier, the weight percent content of each component are as follows: aluminium powder 60~80%, oxygen
Change calcium 10~25%, calcium carbonate 10~15%.
The granularity of the deoxidier is 0.1~0.5mm.
A kind of application method of rotary blowing purification molten steel deoxidier, includes the following steps:
1) after converter tapping, ladle enters deoxidier blowing station；Spray gun is inserted into away from 300~500mm of ladle bottom
Molten steel in be blown；Deoxidier is blown the time in 3min or more, to guarantee deoxidation effectiveness；Deoxidier is blown additional amount
1.5~2.2kg/ tons of steel, the initial oxygen value of concrete foundation molten steel and final oxygen value determine；
2) after all molten steel is added in deoxidier, deoxidation process terminates, and ladle 3~5min of soft argon blowing, then molten steel is transferred to down
One process.
Following embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment and tool
The operating process of body, but protection scope of the present invention is not limited to following embodiments.Method therefor is such as without spy in following embodiments
Not mentionleting alone bright is conventional method.
In following embodiment, two tank molten steel are de- using normal ferro-aluminum using the deoxidation of deoxidier blowing method, a tank molten steel
Oxygen compares test, and three tank test steels water are SPHC steel, in 260t converter smelting.
[embodiment 1]
(1) in the present embodiment, the constituent of deoxidier is aluminium powder, calcium oxide and calcium carbonate.The weight of aluminium powder is deoxidation
The 66% of agent total weight, calcium oxide weight are the 22% of deoxidier total weight, and weight of calcium carbonate is the 12% of deoxidier total weight.
The granularity of the deoxidier is 0.1~0.5mm；
(2) after converter tapping, ladle enters deoxidier blowing station, and spray gun is inserted into the steel away from ladle bottom 380mm
It is blown in water, the blowing time is 4.5min.Deoxidier blowing amount is set according to the initial oxygen value and final oxygen value of molten steel,
In the present embodiment, deoxidier blowing amount is 455kg, molten steel [O] < 0.0010% after blowing；
(3) after all molten steel is added in deoxidier, ladle soft argon blowing 4min.Molten steel from deoxidier blowing station move out after, into
The normal refining of row and continuous casting operation.
[embodiment 2]
(1) in the present embodiment, the constituent of deoxidier is aluminium powder, calcium oxide and calcium carbonate.The weight of aluminium powder is deoxidation
The 68% of agent total weight, calcium oxide weight are the 21% of deoxidier total weight, and weight of calcium carbonate is the 11% of deoxidier total weight.
The granularity of the deoxidier is 0.1~0.5mm；
(2) after converter tapping, ladle enters deoxidier blowing station, and spray gun is inserted into the steel away from ladle bottom 400mm
It is blown in water, the blowing time is 4.8min.Deoxidier blowing amount is set according to the initial oxygen value and final oxygen value of molten steel,
In the present embodiment, deoxidier blowing amount is 471kg, molten steel [O] < 0.0010% after blowing；
(3) after all molten steel is added in deoxidier, ladle soft argon blowing 3.5min.Molten steel from deoxidier blowing station move out after,
It is normally refined and continuous casting operation.
Above 2 embodiments see the table below with conventional deoxidization technique comparative test data；When comparative test, converter tapping process
Deoxidation is carried out with ferro-aluminum (Al=55%), ferro-aluminum additional amount is 1.92kg/ tons of steel.
| Deoxidier additional amount (kg/ tons of steel) | Molten steel [O] content (%) after deoxidation | Slab total oxygen data (%) | |
| Embodiment 1 | 1.75 | 0.0007 | 0.0027 |
| Embodiment 2 | 1.81 | 0.0072 | 0.0029 |
| Comparative test | 1.92 | 0.0094 | 0.0034 |
It can be seen that by the above comparative test and deoxidier of the present invention be added into molten steel using pulvis blowing method
The deoxidation effect of converter may be implemented completely, and be better than from the cleanliness that the total oxygen data of final slab can be seen that product
Conventional deoxidization technique.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (3)
1. a kind of rotary blowing purifies molten steel deoxidier, which is characterized in that the deoxidier is by aluminium powder, calcium oxide and calcium carbonate
It is made after mixing；On the basis of the total weight of deoxidier, the weight percent content of each component are as follows: aluminium powder 60~80%, oxidation
Calcium 10~25%, calcium carbonate 10~15%.
2. a kind of rotary blowing according to claim 1 purifies molten steel deoxidier, which is characterized in that the deoxidier
Granularity is 0.1~0.5mm.
3. a kind of application method of rotary blowing purification molten steel deoxidier as described in claim 1, which is characterized in that including such as
Lower step:
1) after converter tapping, ladle enters deoxidier blowing station；Spray gun is inserted into the steel away from 300~500mm of ladle bottom
It is blown in water；Deoxidier is blown the time in 3min or more；It is 1.5~2.2kg/ tons of steel that deoxidier, which is blown additional amount,；
2) after all molten steel is added in deoxidier, deoxidation process terminates, and ladle 3~5min of soft argon blowing, then molten steel is transferred to next work
Sequence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710890028.0A CN109554518B (en) | 2017-09-27 | 2017-09-27 | Deoxidizer for purifying molten steel by rotary blowing and use method thereof |
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| CN201710890028.0A CN109554518B (en) | 2017-09-27 | 2017-09-27 | Deoxidizer for purifying molten steel by rotary blowing and use method thereof |
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| CN109554518A true CN109554518A (en) | 2019-04-02 |
| CN109554518B CN109554518B (en) | 2020-10-27 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2658315A1 (en) * | 1976-12-22 | 1978-06-29 | Aikoh Co | Steel refining agent - for deoxidation and desulphurisation of stainless steel melts |
| JPS6320409A (en) * | 1986-07-15 | 1988-01-28 | Nippon Kokan Kk <Nkk> | Ladle refining method |
| JPH0219408A (en) * | 1988-07-06 | 1990-01-23 | Kawasaki Steel Corp | Method for desulfurizing molten iron |
| JPH0551624A (en) * | 1991-08-21 | 1993-03-02 | Kawasaki Steel Corp | Production of low carbon al killed steel having high cleanliness |
| CN1962888A (en) * | 2006-11-20 | 2007-05-16 | 梅才平 | Ladle slag modified aluminium slag pellet |
| CN102643948A (en) * | 2012-05-21 | 2012-08-22 | 钢铁研究总院 | Ultra-low carbon steel converter final slag modifier and using method thereof |
| CN205676501U (en) * | 2016-06-24 | 2016-11-09 | 石家庄钢铁有限责任公司 | LF refining furnace powdery deoxidizer automatically adding device |
-
2017
- 2017-09-27 CN CN201710890028.0A patent/CN109554518B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2658315A1 (en) * | 1976-12-22 | 1978-06-29 | Aikoh Co | Steel refining agent - for deoxidation and desulphurisation of stainless steel melts |
| JPS6320409A (en) * | 1986-07-15 | 1988-01-28 | Nippon Kokan Kk <Nkk> | Ladle refining method |
| JPH0219408A (en) * | 1988-07-06 | 1990-01-23 | Kawasaki Steel Corp | Method for desulfurizing molten iron |
| JPH0551624A (en) * | 1991-08-21 | 1993-03-02 | Kawasaki Steel Corp | Production of low carbon al killed steel having high cleanliness |
| CN1962888A (en) * | 2006-11-20 | 2007-05-16 | 梅才平 | Ladle slag modified aluminium slag pellet |
| CN102643948A (en) * | 2012-05-21 | 2012-08-22 | 钢铁研究总院 | Ultra-low carbon steel converter final slag modifier and using method thereof |
| CN205676501U (en) * | 2016-06-24 | 2016-11-09 | 石家庄钢铁有限责任公司 | LF refining furnace powdery deoxidizer automatically adding device |
Non-Patent Citations (1)
| Title |
|---|
| 朱文佳等: "《电弧炉--炉外精炼技术 第3辑》", 31 December 1991, 冶金工业出版社 * |
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