CN101684510B - Novel method for modifying top slag in steel ladle of boiling steel - Google Patents
Novel method for modifying top slag in steel ladle of boiling steel Download PDFInfo
- Publication number
- CN101684510B CN101684510B CN2008100133741A CN200810013374A CN101684510B CN 101684510 B CN101684510 B CN 101684510B CN 2008100133741 A CN2008100133741 A CN 2008100133741A CN 200810013374 A CN200810013374 A CN 200810013374A CN 101684510 B CN101684510 B CN 101684510B
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- Prior art keywords
- top slag
- steel
- slag
- whisking appliance
- ladle
- Prior art date
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- 239000002893 slag Substances 0.000 title claims abstract description 47
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 31
- 239000010959 steel Substances 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000009835 boiling Methods 0.000 title abstract 3
- 230000004048 modification Effects 0.000 claims abstract description 14
- 238000012986 modification Methods 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 239000000725 suspension Substances 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 2
- 239000011819 refractory material Substances 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 abstract description 13
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 11
- 229910000655 Killed steel Inorganic materials 0.000 abstract description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 238000007670 refining Methods 0.000 abstract description 4
- 238000003756 stirring Methods 0.000 abstract description 4
- 239000003607 modifier Substances 0.000 abstract description 3
- 230000003749 cleanliness Effects 0.000 abstract 1
- 238000010907 mechanical stirring Methods 0.000 abstract 1
- 238000009628 steelmaking Methods 0.000 abstract 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000004411 aluminium Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 206010058490 Hyperoxia Diseases 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000222 hyperoxic effect Effects 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention relates to molten steel secondary refining for steelmaking, in particular to a novel method for modifying top slag in a ladle of boiling steel, which adopts a mechanical stirring method to stir the top slag and promotes modifier and top slag to fully contact and react; the modifier mainly comprises the following components: 30-70 parts of CaO and 70-30 parts of Al. The method is suitable for low-carbon aluminum killed steel with the carbon content of 150-500 ppm or ultra-low-carbon aluminum killed steel with the carbon content of less than 60 ppm. Compared with the prior art, the invention has the advantages that: effectively ensures the modification effect of the top slag of the boiling steel, reduces the content of FeO in the steel slag to be below 4 percent, and can be used for producing the steel with high cleanliness for cold-rolled sheets.
Description
Technical field
The steel secondary refining that the present invention relates to make steel is a kind of to top slag new method for modifying in the rimming steel ladle.
Background technology
The production route of ultra low-carbon steel is that rimming steel is produced in converter, reduces the carbon content of molten steel through vacuum refinement.Difficult in this route to slag upgrading in top in the ladle; Existing method for modifying is in molten steel tank deck slag, to add modification agent, through the method for molten steel being carried out argon bottom-blowing dynamic conditions is provided, but has done a lot of drawbacks like this; Like upgrading after vacuum refinement, will cause the molten steel after refining oxidation; Like upgrading before vacuum refinement, because the molten steel oxygen level is high, top slag modifier and the reaction of steel water oxygen, the upgrading effect is relatively poor.If upgrading not, in casting cycle, the top slag of hyperoxia voltinism will cause secondary pollution to molten steel.
Summary of the invention
The purpose of this invention is to provide a kind of a kind of to top slag new method for modifying in the rimming steel ladle of above-mentioned defective that avoid, this method is carried out molten steel tank deck slag upgrading through churned mechanically mode, can effectively improve steel quality.
For realizing above-mentioned purpose, the present invention realizes through following technical scheme:
A kind of this method adopts churned mechanically method that the top slag is stirred to top slag new method for modifying in the rimming steel ladle, promotes that modification agent fully contacts, reacts with the top slag; The staple of modification agent is: CaO30～70 weight parts, Al70～30 weight parts.
This method is applicable to carbon content at 150～500ppm carbon aluminium-killed steel, or carbon content is less than 60ppm Ultra-low carbon aluminium killed steel.
Compared with prior art, advantage of the present invention is:
Effectively guarantee rimming steel top slag upgrading effect, reduce (FeO) in the slag below the content to 4%, the cold rolled sheet that can be used for producing high-cleanness, high is used steel.
Description of drawings
Fig. 1 is the utility model front view
Fig. 2 is Fig. 1 vertical view
Embodiment
The method of top slag upgrading mainly is in the slag of top, to add reductor, and the oxygen in the slag of top is removed in (FeO) reaction in reductor and the top slag, reaches the purpose of upgrading.
Oxygen in the vacuum refinement sinciput slag upgrading process in the molten steel gets into the top slag; Destroy the upgrading effect; The present invention does not use argon bottom-blowing to stir molten steel and as top slag upgrading dynamic conditions is provided; But adopt churned mechanically method that the top slag is stirred, thereby avoid the oxygen in the molten steel to get into top slag participation reaction.
The present invention uses steel grade:
1. carbon content is at 150～500ppm carbon aluminium-killed steel;
2. carbon content is less than 60ppm Ultra-low carbon aluminium killed steel;
Concrete technical scheme is narrated as follows:
1. molten steel gets in the ladle behind converter smelting, before ladle arrives the RH refining furnace, carries out top slag upgrading operation;
2. at first add modification agent to the ladle top slag surface, the modification agent major ingredient is:
CaO30～70 weight parts; Al30～70 weight parts
3. adopt churned mechanically method that the top slag is stirred, promote modification agent fully to contact, react, reach in the modification agent (FeO) abundant purpose of reacting in the aluminium and top slag with the top slag;
Above the slag road of converter tapping, make special mechanism, realize the up-down of whisking appliance.After converter tapping finishes, add modification agent through feed bin to the ladle top slag surface by converter.Buggy ladle leaves to the whisking appliance below, the whisking appliance that goes up and down repeatedly, and the realization modification agent fully contacts, fully reacts with the top slag, reaches the purpose of top slag upgrading.
The structure of described whisking appliance is: like Fig. 1, shown in Figure 2, comprise agitator body 1, suspension ring 2 and little whisking appliance 3, agitator body 1 adopts circular cast iron to process, and its diameter is slightly less than ladle internal diameter suitable for reading, and thickness is 100mm～200mm.Suspension ring 2 are installed on the top of agitator body 1, arrange on the bottom surface of agitator body 1 the little whisking appliance 3 that a plurality of bottoms are inverted arrowhead form is set, and little whisking appliance 3 adopts refractory materials to process.
(1) can adopt with the crane handling and by the overhead crane control whisking appliance in the slag of top, to go up and down;
(2) can whisking appliance be installed in the slag road top of converter tapping, make special machinery, realize the up-down of whisking appliance, realization is to the stirring of top slag;
(3) can whisking appliance be installed in the preparation position of vacuum refinement, make special machinery, realize the up-down of whisking appliance, realize stirring the top slag.
Claims (1)
1. one kind is directed against top slag new method for modifying in the rimming steel ladle, it is characterized in that this method adopts churned mechanically method that the top slag is stirred, and promotes that modification agent fully contacts, reacts with the top slag; The staple of modification agent is: CaO 30～70 weight parts, Al 70～30 weight parts; After converter tapping finishes, add modification agent through feed bin to the ladle top slag surface by converter; Buggy ladle leaves to the whisking appliance below, the whisking appliance that goes up and down repeatedly, and the realization modification agent fully contacts, fully reacts with the top slag, reaches the purpose of top slag upgrading;
The structure of described whisking appliance is: comprise agitator body, suspension ring and little whisking appliance, agitator body adopts circular cast iron to process, and its diameter is slightly less than ladle internal diameter suitable for reading, and thickness is 100mm～200mm; Suspension ring are installed on the top of agitator body, arrange on the bottom surface of agitator body the little whisking appliance that a plurality of bottoms are inverted arrowhead form is set, and little whisking appliance adopts refractory materials to process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100133741A CN101684510B (en) | 2008-09-26 | 2008-09-26 | Novel method for modifying top slag in steel ladle of boiling steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100133741A CN101684510B (en) | 2008-09-26 | 2008-09-26 | Novel method for modifying top slag in steel ladle of boiling steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101684510A CN101684510A (en) | 2010-03-31 |
| CN101684510B true CN101684510B (en) | 2012-07-18 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100133741A Active CN101684510B (en) | 2008-09-26 | 2008-09-26 | Novel method for modifying top slag in steel ladle of boiling steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101684510B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102296141B (en) * | 2010-06-25 | 2013-11-06 | 鞍钢股份有限公司 | Converter steelmaking final slag modifier and use method thereof |
| CN102787214B (en) * | 2012-08-08 | 2015-06-10 | 江苏大学 | Ladle furnace refining fluoride-free pre-melted slags, preparation method and using method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1271021A (en) * | 2000-04-25 | 2000-10-25 | 宝山钢铁股份有限公司 | Pre-smelted steel ladle slag reductant and its preparation |
| CN1279294A (en) * | 1999-07-05 | 2001-01-10 | 川崎制铁株式会社 | Deslphurizing method for smelting iron alloy |
| CN101177722A (en) * | 2007-12-06 | 2008-05-14 | 鞍钢股份有限公司 | Al-Ca matter converter slag reduction modifier |
-
2008
- 2008-09-26 CN CN2008100133741A patent/CN101684510B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1279294A (en) * | 1999-07-05 | 2001-01-10 | 川崎制铁株式会社 | Deslphurizing method for smelting iron alloy |
| CN1271021A (en) * | 2000-04-25 | 2000-10-25 | 宝山钢铁股份有限公司 | Pre-smelted steel ladle slag reductant and its preparation |
| CN101177722A (en) * | 2007-12-06 | 2008-05-14 | 鞍钢股份有限公司 | Al-Ca matter converter slag reduction modifier |
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| Publication number | Publication date |
|---|---|
| CN101684510A (en) | 2010-03-31 |
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