CN101736135A - Reduction upgrading agent of ladle top slag for ultra-low-carbon steel and using method thereof - Google Patents
Reduction upgrading agent of ladle top slag for ultra-low-carbon steel and using method thereof Download PDFInfo
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- CN101736135A CN101736135A CN200910251486A CN200910251486A CN101736135A CN 101736135 A CN101736135 A CN 101736135A CN 200910251486 A CN200910251486 A CN 200910251486A CN 200910251486 A CN200910251486 A CN 200910251486A CN 101736135 A CN101736135 A CN 101736135A
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- ladle top
- top slag
- steel
- upgrading agent
- reduction upgrading
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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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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention provides a reduction upgrading agent of ladle top slag for ultra-low-carbon steel, comprising the following components in percentage by weight: 35-60% of MAl, 15-30% of CaCo3 and 10-35% of CaO. The using method of the reduction upgrading agent comprises the following steps of: adding lime of 2-6kg and fluorite of 0.5-1kg to steel of per ton in the converter tapping process; after finishing the tapping, starting bottom argon blowing and forcedly stirring when the molten steel enters an argon flushing station, closing the bottom argon blowing after the ladle top slag are completely molten, and uniformly adding the ladle top slag reduction upgrading agent of 3-6kg to the steel of per ton by a rotary distributor, wherein after using the ladle top slag reduction upgrading agent, the purpose that the content of FeO and MnO in the slag is less than 6% and the ratio of CaO to Al2O3 is controlled within the range of 1.2-1.8 is achieved.
Description
Technical field
The invention belongs to steel-making refining field, relate in particular to the reduction upgrading agent of ladle top slag and the using method background technology thereof of producing ultra low-carbon steel
When adopting " converter-argon station-RH-continuous casting " operational path production Ultra-low carbon steel series, owing to can not as the LF refining ladle top slag fully be reduced, FeO and MnO content after the RH refining finishes in the slag are very high.Ladle top slag still belongs to hyperoxia voltinism slag, and in the pouring molten steel later stage in the casting process, the oxygen in the slag produces a large amount of Al in a large number to the molten steel transmission with Als reaction in the steel
2O
3Be mingled with, influence the molten steel cleanliness factor, stream is held in serious also can causing, is difficult for realizing sequence casting.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of reduction upgrading agent of ladle top slag for ultra-low-carbon steel, use this reduction upgrading agent of ladle top slag for ultra-low-carbon steel, not only solved the flow problem that holds of production Ultra-low carbon molten steel continuous casting casting cycle, realized many stoves continuous casting; The cleanliness factor of molten steel be can improve simultaneously, inclusion and steel surface defective in the steel reduced.The present invention also provides its using method.
For solving the problems of the technologies described above, the invention provides a kind of reduction upgrading agent of ladle top slag for ultra-low-carbon steel, it is characterized in that its weight percentages of components is: MAl:35～60%, CaCO
3: 15～30%, CaO:10～35%, MAl are metallic aluminium.
Optimal technical solution of the present invention is that its weight percentages of components is: MAl:60%, CaCO
3: 30%, CaO:10%.
The using method of reduction upgrading agent of ladle top slag for ultra-low-carbon steel provided by the invention is: add lime 2～6kg/t steel in the converter tapping process, fluorite 0.5～1kg/t steel; After tapping finished, molten steel entered the Argon station, opened BOTTOM ARGON BLOWING and stirred by force, closed BOTTOM ARGON BLOWING after ladle top slag is melted fully, evenly added described reduction upgrading agent of ladle top slag 3～6kg/t steel with revolving top subsequently.Before using, described reduction upgrading agent of ladle top slag becomes the ball of 20～30mm with hot mechanical compaction.
Because the metallic aluminium (MAl) in the modification agent can reduce FeO and MnO in the slag of top, CaCO
3At high temperature take place to decompose and produce CO
2Gas stirs ladle top slag, promotes that metallic aluminium and the ladle top slag in the modification agent fully reacts, thus behind this reduction upgrading agent of ladle top slag of use, in the slag (FeO+MnO) content less than 5%, CaO/Al
2O
3Ratio is controlled in 1.2～1.8 scopes, has not only solved the flow problem that holds of production Ultra-low carbon molten steel continuous casting casting cycle, has realized many stoves continuous casting; The cleanliness factor of molten steel be can improve simultaneously, inclusion and steel surface defective in the steel reduced.
Embodiment
The chemical ingredients of reduction upgrading agent of ladle top slag provided by the invention (weight percent) is: MAl:35～60%, CaCO
3: 15～30%, CaO:10～35%, MAl are metallic aluminium.Before using, described reduction upgrading agent of ladle top slag becomes the ball of 20～30mm with hot mechanical compaction.Metallic aluminium in the modification agent is mainly used to reduce FeO and MnO in the slag of top, adds CaCO
3Purpose is to make it that generation CO at high temperature take place to decompose
2Gas comes ladle top slag is stirred, and promotes that metallic aluminium and the ladle top slag in the modification agent fully reacts, and reduces FeO and MnO content in the slag.
The CaO of reduction upgrading agent of ladle top slag of the present invention is used for guaranteeing the CaO/Al in the slag behind the ladle top slag upgrading
2O
3Ratio control makes this slag system have the ability of stronger dross inclusion adsorption in 1.2～1.8 scopes.Described reduction upgrading agent of ladle top slag joins the top of the slag at the Argon station uniformly by revolving top, guarantees that ladle top slag is in complete melted state and closes steel ladle bottom argon blowing before adding this modification agent, can make the CaCO in the modification agent of adding like this
3At high temperature can decompose the CO of generation rapidly
2The gas stirring ladle top slag is fully reduced ladle top slag.
The using method of reduction upgrading agent of ladle top slag of the present invention is: add lime 2～6kg/t steel in the converter tapping process, fluorite 0.5～1kg/t steel; After tapping finished, molten steel entered the Argon station, opens BOTTOM ARGON BLOWING and stirs by force, made ladle top slag melt the back fully and closed BOTTOM ARGON BLOWING, evenly added reduction upgrading agent of ladle top slag 3～6kg/t steel with revolving top subsequently.Before using, described reduction upgrading agent of ladle top slag becomes the ball of 20～30mm with hot mechanical compaction.
Describe the present invention in detail with 5 each embodiment below.
Table 1 is the composition of reduction upgrading agent of ladle top slag composition, and table 2 is a ladle top slag composition behind the upgrading.
Show 1:5 embodiment composition
| Embodiment | ??MAl/％ | ??CaCO3/％ | ??CaO/％ |
| ??1 | ??35 | ??30 | ??35 |
| ??2 | ??40 | ??25 | ??35 |
| ??3 | ??50 | ??20 | ??30 |
| ??4 | ??55 | ??15 | ??30 |
| ??5 | ??60 | ??30 | ??10 |
Table 2: ladle top slag composition behind the upgrading
| Embodiment | Lime addition (kg/t steel) | Fluorite addition (kg/t steel) | Modification agent addition (kg/t steel) | ??FeO％ | ??MnO％ | ??CaO/Al 2O 3 |
| ??1 | ??2 | ??0.5 | ??5 | ??4.2 | ??1.42 | ??1.38 |
| ??2 | ??3.5 | ??0.5 | ??5 | ??3.9 | ??1.35 | ??1.42 |
| ??3 | ??5 | ??0.7 | ??5 | ??3.4 | ??1.26 | ??1.53 |
| ??4 | ??5.5 | ??0.8 | ??5 | ??2.8 | ??1.21 | ??1.55 |
| ??5 | ??6 | ??1.0 | ??5 | ??2.5 | ??1.12 | ??1.62 |
As shown in Table 2, use reduction upgrading agent of ladle top slag after, realized in the slag (FeO+MnO) content less than 6%, CaO/Al
2O
3Ratio is controlled at 1.2～1.8 scopes with interior target.
Claims (5)
1. a reduction upgrading agent of ladle top slag for ultra-low-carbon steel is characterized in that, its weight percentages of components is: MAl:35～60%, CaCO
3: 15～30%, CaO:10～35%.
2. reduction upgrading agent of ladle top slag for ultra-low-carbon steel as claimed in claim 1 is characterized in that, its weight percentages of components is: MAl:50～60%, CaCO
3: 20～30%, CaO..10～30%.
3. reduction upgrading agent of ladle top slag for ultra-low-carbon steel as claimed in claim 1 is characterized in that, its weight percentages of components is: MAl:60%, CaCO
3: 30%, CaO:10%.
4. the using method of the described reduction upgrading agent of ladle top slag for ultra-low-carbon steel of claim 1 is characterized in that, adds lime 2～6kg/t steel in the converter tapping process, fluorite 0.5～1kg/t steel; After tapping finished, molten steel entered the Argon station, opened BOTTOM ARGON BLOWING and stirred by force, closed BOTTOM ARGON BLOWING after ladle top slag is melted fully, evenly added described reduction upgrading agent of ladle top slag 3～6kg/t steel with revolving top subsequently.
5. the using method of reduction upgrading agent of ladle top slag for ultra-low-carbon steel as claimed in claim 4 is characterized in that, becomes the ball of 20～30mm before described reduction upgrading agent of ladle top slag uses with hot mechanical compaction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910251486A CN101736135A (en) | 2009-12-22 | 2009-12-22 | Reduction upgrading agent of ladle top slag for ultra-low-carbon steel and using method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910251486A CN101736135A (en) | 2009-12-22 | 2009-12-22 | Reduction upgrading agent of ladle top slag for ultra-low-carbon steel and using method thereof |
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|---|---|
| CN101736135A true CN101736135A (en) | 2010-06-16 |
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ID=42460165
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|---|---|---|---|
| CN200910251486A Pending CN101736135A (en) | 2009-12-22 | 2009-12-22 | Reduction upgrading agent of ladle top slag for ultra-low-carbon steel and using method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2450059C1 (en) * | 2010-11-17 | 2012-05-10 | Открытое акционерное общество "Магнитогорский металлургический комбинат" | Solid slag-forming mixture to refine steel |
| 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 |
| CN102816898A (en) * | 2012-09-25 | 2012-12-12 | 鞍钢股份有限公司 | Method of interstitial-free atom steel top slag substance transformation |
| CN103320570A (en) * | 2012-03-19 | 2013-09-25 | Jfe钢铁株式会社 | Method for manufacturing steel |
| CN103374642A (en) * | 2012-04-25 | 2013-10-30 | 宝山钢铁股份有限公司 | De-oxidation modifying agent for steel ladle top slag |
| CN111218537A (en) * | 2018-11-23 | 2020-06-02 | 宝山钢铁股份有限公司 | Method for improving hot rolling quality of electromagnetic stirring plate blank |
| RU2735697C1 (en) * | 2020-03-24 | 2020-11-06 | Федеральное государственное бюджетное учреждение науки Институт металлургии Уральского отделения Российской академии наук (ИМЕТ УрО РАН) | Method of out-of-furnace treatment of steel in ladle |
| CN112646953A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | Steel slag modification method and device for ultra-low carbon steel |
-
2009
- 2009-12-22 CN CN200910251486A patent/CN101736135A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2450059C1 (en) * | 2010-11-17 | 2012-05-10 | Открытое акционерное общество "Магнитогорский металлургический комбинат" | Solid slag-forming mixture to refine steel |
| CN103320570A (en) * | 2012-03-19 | 2013-09-25 | Jfe钢铁株式会社 | Method for manufacturing steel |
| TWI486454B (en) * | 2012-03-19 | 2015-06-01 | Jfe Steel Corp | Steel manufacturing method |
| CN103320570B (en) * | 2012-03-19 | 2016-06-22 | Jfe钢铁株式会社 | The manufacture method of steel |
| CN103374642A (en) * | 2012-04-25 | 2013-10-30 | 宝山钢铁股份有限公司 | De-oxidation modifying agent for steel ladle top slag |
| CN103374642B (en) * | 2012-04-25 | 2015-04-01 | 宝山钢铁股份有限公司 | De-oxidation modifying agent for steel ladle top slag |
| 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 |
| CN102816898A (en) * | 2012-09-25 | 2012-12-12 | 鞍钢股份有限公司 | Method of interstitial-free atom steel top slag substance transformation |
| CN102816898B (en) * | 2012-09-25 | 2014-01-01 | 鞍钢股份有限公司 | Method of interstitial-free atom steel top slag substance modification |
| CN111218537A (en) * | 2018-11-23 | 2020-06-02 | 宝山钢铁股份有限公司 | Method for improving hot rolling quality of electromagnetic stirring plate blank |
| RU2735697C1 (en) * | 2020-03-24 | 2020-11-06 | Федеральное государственное бюджетное учреждение науки Институт металлургии Уральского отделения Российской академии наук (ИМЕТ УрО РАН) | Method of out-of-furnace treatment of steel in ladle |
| CN112646953A (en) * | 2020-11-23 | 2021-04-13 | 首钢集团有限公司 | Steel slag modification method and device for ultra-low carbon steel |
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Application publication date: 20100616 |