CN103374642A - De-oxidation modifying agent for steel ladle top slag - Google Patents
De-oxidation modifying agent for steel ladle top slag Download PDFInfo
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- CN103374642A CN103374642A CN2012101225997A CN201210122599A CN103374642A CN 103374642 A CN103374642 A CN 103374642A CN 2012101225997 A CN2012101225997 A CN 2012101225997A CN 201210122599 A CN201210122599 A CN 201210122599A CN 103374642 A CN103374642 A CN 103374642A
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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
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Abstract
The invention relates to steel ladle furnace slag modifying agent in a converter steel tapping process. The de-oxidation modifying agent for the steel ladle top slag comprises the following main components in percentage by weight: 30%-50% of Al, 50%-30% of CaO, 5.0%-8.0% of Al2O3, not more than 3.0% of SiO2, not more than 0.07% of S+P, 0.7%-1.4% of C, 3.0%-8.0% of CaFe2 and not more than 0.2% of H2O. The modifying agent disclosed by the invention is a reductive modifying agent which can be used for solving an oxidation problem of the steel ladle top slag in a low-carbon pipeline steel production process, so that guarantee is provided for vacuum desulfurization and pure production of the pipeline steel.
Description
Technical field
The present invention relates to the ladle furnace slag modifier in the converter tapping process.
Background technology
Converter tapping latter stage, in-furnace slag can be carried by molten steel inevitably and enter ladle.The converter slag that enters ladle is oxidisability, and in refining process subsequently, the oxygen in the slag spreads to molten steel, has increased the oxygen position of molten steel, causes the molten steel secondary oxidation, pollutes molten steel, is unfavorable for the desulfurization of molten steel.Therefore, adding modification agent at converter tapping process in ladle, the converter slag that carries in the ladle is carried out modifying process, reduce its oxidisability, improve the ability of top slag dross inclusion adsorption, is the important means of smelting Clean Steel.For the low-carbon (LC) pipe line steel that adopts converter-RH technical process to produce, the converter slag upgrading effect of carrying in the ladle has determined the success or failure of desulfurization among the RH.
The used modification agent of existing ladle top slag upgrading generally adopts the CaO based raw material, adds Al
2O
3And CaF
2As fusing assistant, add part metals Al as reductor, even add part B
2O
3Or CaF
2, to improve the ability of oxide inclusion in top slag flowability, oxidisability and the absorption molten steel.
Summary of the invention
The object of the present invention is to provide a kind of ladle top slag deoxidation modification agent, this modification agent is the reductibility modification agent, can solve the oxidisability problem of ladle top slag in the low-carbon (LC) pipe line steel production process, for Vacuum Desulfurization and the sublimate production of pipe line steel provides safeguard.
For achieving the above object, the present invention has adopted following technical scheme:
A kind of ladle top slag deoxidation modification agent, the main ingredient of described modification agent comprises by percentage to the quality: Al 30-50%, CaO 50-30%, Al
2O
35.0-8.0%, SiO
2≤ 3.0%, S+P≤0.07%, C 0.7-1.4%, CaF
23.0-8.0%, H
2O≤0.2%.
The granularity of described Al is less than 1mm.
Described modification agent granularity is 10-30mm.
The present invention adds a small amount of Al take aluminium bits and CaO as basic
2O
3And SiO
2, a certain amount of fusing assistant, and add micro-carbon dust, the modification agent granularity is controlled at 10-30 mm.
The below to the work of the Main chemical component of modification agent of the present invention as being described in detail.
CaO: in STEELMAKING PRODUCTION, CaO is one of the most frequently used refining slag, can desulfurization, absorb deoxidation type inclusion, secluding air and prevent molten steel secondary oxidation and fixing dephosphorization product etc.So it is basic slag charge that modification agent of the present invention is selected CaO, CaO content is 50-30%.
Al: contain a large amount of FeO and MnO in the converter slag, be strong oxidizing property, be unfavorable for later stage refinement and deoxidation and desulfurization.For this reason, should reduce as far as possible the top slag oxidizing of carrying in the ladle.Modification agent of the present invention selects Al as reductive agent, is mixed in the slag charge, and effectively to slough the oxygen in the slag, for making it fast and the reaction of the oxygen in the slag, the granularity of aluminium should be as far as possible little.Related chemical reaction is
2[Al]+3(FeO)=(Al
2O
3)+3[Fe] (1)
2[Al]+3(MnO)=(Al
2O
3)+3[Mn] (2)
Al content is 30-50% in the modification agent of the present invention, and the granularity of Al is less than 1mm.
C: in modification agent, add carbon, to keep the reducing atmosphere of slag, reduce behind the upgrading activity of FeO and MnO in the slag, under this reducing atmosphere, carbon exists with the carbide form in the slag charge, stablizes the reducing property of slag, reduces the loss of aluminium in molten steel and the slag charge and the secondary oxidation of molten steel.C content is 0.7-1.4% in the modification agent of the present invention.
SiO
2: the SiO that exists in the slag charge of modification agent
2Easily reduced by Al, shown in reaction formula (3), reduce the efficient of Al, should be the least possible.
4[Al]+3(SiO
2)=2(Al
2O
3)+3[Si] (3)
SiO in the modification agent of the present invention
2Content is for being not more than 3.0%.
Al
2O
3: there is Al in the slag charge of modification agent
2O
3And CaO, the fusing point of pure CaO higher is 2580 ℃, modification agent of the present invention is prepared a certain amount of Al
2O
3With the oxidation products of metallic aluminium together, can improve the flowability of melting properties and the slag of CaO.Al in the modification agent of the present invention
2O
3Content is 5.0-8.0%.
CaF
2: CaF
2Middle F ion has the chain-like structure of effectively destroying slag, the ability that promotes the slag fusing, so add a certain amount of fluorite in the modification agent of the present invention, accelerates the slagging speed of modification agent.CaF in the modification agent of the present invention
2Content is 3.0-8.0%.
H
2O:H
2O is that various raw materials self are brought into or make the composition that absorbs behind the modification agent from atmosphere, is impurity component.H in the modification agent of the present invention
2O content is less than 0.2%.
S and P:S and P are the impurity component that various raw materials are brought into.S and P content sum require less than 0.07% in the modification agent of the present invention.
Consider spreadability and the melting of modification agent of the present invention, the modification agent granularity should be as much as possible little, be easy to fly away but cross short grained modification agent, and operating environment of pollution, therefore modification agent granularity of the present invention is 10-30 mm.
About the consumption of modification agent, relevant with the content of (FeO), (MnO) in the quantity of slag of carrying ladle and the slag.According to Theoretical Calculation and practical situation checking, consumption is 1-3 kg/t steel.
Generally after converter tapping is complete, add deoxidation modification agent on the ladle surface immediately, to guarantee that deoxidation modification agent can be sprawled fast, as early as possible fusing, effectively slough the oxygen in the ladle top slag simultaneously.The adding mode can drop into by manual, also can add by distributor.
The carbon aluminium-killed steel that the present invention proposes has following beneficial effect with ladle top slag modifier:
1) behind the upgrading in the ladle top slag 2-4 min i.e. fusing finish, it is respond well to change slag;
2) (%FeO)+(%MnO)＜2.5 in the slag of top behind the upgrading;
3) after the RH desulfurization is processed, (%FeO)+(%MnO)＜2.5 in the slag of top.
The ladle slag modification agent that contains a small amount of carbonaceous material of the present invention has good reductibility and the characteristics of rapid slagging, especially, behind upgrading, can effectively guarantee the reductibility of slag, can realize the continual and steady upgrading of ladle slag, give full play to ladle slag to the desulfurization of molten steel, anti-oxidation with to the adsorption of inclusion, improve the cleanliness factor of molten steel.Modification agent of the present invention is applicable to the top slag upgrading of all carbon steels except ultra low-carbon steel, and environment is had no adverse effects, and all has application value in STEELMAKING PRODUCTION factory.
Embodiment
The invention will be further described below in conjunction with specific embodiment.
Modification agent of the present invention is applied to the Refining Clean Steel in ASEA-SKF process, can obviously improve the flowability of top slag, reduces the oxidisability of top slag, stablizes the reducing property of top slag, reduces the secondary oxidation of molten steel.For providing good desulfurization, absorbing oxide, stably production high-quality product made from steel is mingled with condition.
Typical converter tapping slag composition is as shown in table 1.
The typical converter slag of table 1 forms (mass percent)
| SiO 2 | Al 2O 3 | CaO | MgO | MnO | FeO |
| 7-10 | <1 | 40-50 | 8-10 | 1-2 | 10-20 |
The composition (mass percent) of the used modification agent of table 2 embodiment
| Numbering | Al | CaO | Al 2O 3 | SiO 2 | CaF 2 | C | Other |
| 1 | 48.5 | 35.0 | 6.1 | 2.2 | 5.1 | 0.8 | 2.3 |
| 2 | 44.6 | 37.2 | 6.9 | 2.1 | 6.1 | 1.1 | 2.0 |
| 3 | 41.4 | 38.9 | 7.6 | 2.0 | 6.8 | 1.2 | 2.1 |
| 4 | 38.5 | 41.6 | 7.8 | 1.1 | 7.2 | 1.3 | 2.5 |
| 5 | 40.4 | 39.8 | 7.5 | 1.8 | 7.0 | 1.2 | 2.3 |
3 typical heats that adopt modification agent of the present invention to smelt are described below.Used modification agent composition is as shown in table 2, and the granularity of modification agent is 10-30 mm.
Embodiment 1, and after converter smelting finished, ladle bottom was spread the about 0.77t of CaO, the pushing off the slag tapping.Converter tapping quantity is 295t, and tap is 2/3 o'clock, adds ferromanganese 3t, aluminium silicomanganese 1.6t and ferroaluminium 0.2t, and molten steel is carried out complex deoxidization.After tapping finishes rapidly in ladle the top of the slag add modification agent 0.47t of the present invention, ladle top slag is carried out deoxidation, upgrading.Can see that slag is sprawled at the top of the slag rapidly and come after adding ladle, slag namely melts and finishes in 3.1 min, in the slag: %SiO
2=12.09, %Al
2O
3=41.99, %CaO=33.1, %MgO=4.95, %MnO=1.74, %FeO=0.21, (%FeO)+(%MnO)＜2.5 in the slag, effect is better.After the RH desulfurization (6 kg/t steel sweetening agent), top slag main component is: %SiO
2=10.93, %Al
2O
3=38.68, %CaO=36.30, %MgO=6.18, %MnO=1.41, %FeO=0.20 since in the slag existence of a small amount of carbon particles so that the top slag keeps reductibility, (%FeO) and (%MnO) stable decline in the slag, (%FeO)+(%MnO)＜2.5, desulfuration efficiency is 45%, and the tundish total oxygen content is 16ppm.
Embodiment 2, and after converter smelting finished, ladle bottom was spread the about 0.7t of CaO, the pushing off the slag tapping.Converter tapping quantity is 300t, and tap is 2/3 o'clock, adds ferromanganese 3.1t, ferrosilicon 0.4t and aluminium 0.45t, and molten steel is carried out complex deoxidization.After tapping finishes rapidly in ladle the top of the slag add modification agent 0.44t of the present invention, ladle top slag is carried out deoxidation, upgrading.Can see that slag is sprawled at the top of the slag rapidly and come after adding ladle, slag namely melts and finishes in 2.6 min, and the main component of ladle top slag is: %SiO
2=9.45, %Al
2O
3=46.46, %CaO=36, %MgO=3.67, %MnO=1.49, %FeO=0.09, (%FeO)+(%MnO)＜2.5 are respond well in the slag.After the RH desulfurization (6kg/t steel sweetening agent), top slag main component is %SiO
2=8.80, %Al
2O
3=34.96, %CaO=45.64, %MgO=4.47, %MnO=1.22, %FeO=0.11 since in the slag existence of a small amount of carbon particles so that slag keeps reductibility, (%FeO) with (%MnO) stable decline, (%FeO)+(%MnO)＜2.5, desulfuration efficiency is 47%, and total oxygen content is 15ppm in the tundish.
Embodiment 3, and after converter smelting finished, ladle bottom was spread the about 0.3t of CaO, the pushing off the slag tapping.Converter tapping quantity is 300t, and tap is 2/3 o'clock, adds electrolytic manganese 2.0t, silicomanganese 2.5t and ferro-aluminum 1.3t, and molten steel is carried out complex deoxidization.After tapping finishes rapidly in ladle the top of the slag add modification agent 0.42t of the present invention, ladle top slag is carried out deoxidation, upgrading.Can see that slag is sprawled at the top of the slag rapidly and come after adding ladle, slag namely melts and finishes in 2.5 min, and the main component of ladle top slag is: %SiO
2=8.30, %Al
2O
3=46.68, %CaO=33.14, %MgO=5.44, %MnO=1.99, %FeO=0.21, (%FeO)+(%MnO)＜2.5 are respond well in the slag.After the RH desulfurization (4.9 kg/t steel sweetening agent), top slag main component is: %SiO
2=7.66, %Al
2O
3=28.14, %CaO=50.68, %MgO=5.50, %MnO=1.73, %FeO=0.23 since in the slag existence of a small amount of carbon particles so that slag keeps reductibility, (%FeO) descend with (%MnO) sum is stable, (%FeO)+(%MnO)＜2.5, desulfuration efficiency is 40.8%, and the tundish total oxygen content is 16ppm.
Embodiment 4, and after converter smelting finished, ladle bottom was spread the about 0.35t of CaO, the pushing off the slag tapping.Converter tapping quantity is 300t, and tap is 2/3 o'clock, adds electrolytic manganese 1.8t, silicomanganese 2.6t and ferro-aluminum 1.4 t, and molten steel is carried out complex deoxidization.After tapping finishes rapidly in ladle the top of the slag add modification agent 0.50t of the present invention, ladle top slag is carried out deoxidation, upgrading.Can see that slag is sprawled at the top of the slag rapidly and come after adding ladle, slag namely melts and finishes in 2.5 min, and the main component of ladle top slag is: %SiO
2=6.82, %Al
2O
3=41.58, %CaO=39.15, %MgO=5.24, %MnO=1.78, %FeO=0.15, (%FeO)+(%MnO)＜2.5 are respond well in the slag.After the RH desulfurization (5.2 kg/t steel sweetening agent), top slag main component is: %SiO
2=6.52, %Al
2O
3=33.25, %CaO=47.68, %MgO=6.11, %MnO=1.48, %FeO=0.14 since in the slag existence of a small amount of carbon particles so that slag keeps reductibility, (%FeO) descend with (%MnO) sum is stable, (%FeO)+(%MnO)＜2.5, desulfuration efficiency is 45.8%, and the tundish total oxygen content is 15ppm.
Embodiment 5, and after converter smelting finished, ladle bottom was spread the about 0.3t of CaO, the pushing off the slag tapping.Converter tapping quantity is 300t, and tap is 2/3 o'clock, adds electrolytic manganese 2.0t, silicomanganese 2.5t and ferro-aluminum 1.3t, and molten steel is carried out complex deoxidization.After tapping finishes rapidly in ladle the top of the slag add modification agent 0.42t of the present invention, ladle top slag is carried out deoxidation, upgrading.Can see, slag is sprawled at the top of the slag rapidly and is come after adding ladle, and slag namely melts and finishes in 2.4 min, the main component of ladle top slag is: %SiO2=8.8, %Al2O3=44.55, %CaO=37.27, %MgO=4.54, %MnO=1.89, %FeO=0.19, (%FeO)+(%MnO)＜2.5 are respond well in the slag.After the RH desulfurization (5.5 kg/t steel sweetening agent), top slag main component is: %SiO2=7.57, %Al2O3=36.44, %CaO=43.36, %MgO=5.91, %MnO=1.61, %FeO=0.22 since in the slag existence of a small amount of carbon particles so that slag keeps reductibility, (%FeO) descend with (%MnO) sum is stable, (%FeO)+(%MnO)＜2.5, desulfuration efficiency is 46.2%, and the tundish total oxygen content is 15ppm.
Can find out, adopt modification agent of the present invention can make in the ladle slag oxidisability composition (%FeO) and (%MnO) content obviously reduce, reach below 2.5%, and can in whole process, keep stable.Guarantee the desulfuration efficiency of molten steel under the vacuum, can realize preferably the control to the steel inclusion total amount, so that the total oxygen content of Metal in Tundish is lower, reached the purpose that improves steel quality.
Claims (3)
1. ladle top slag deoxidation modification agent, it is characterized in that: the main ingredient of described modification agent comprises by percentage to the quality: Al 30-50%, CaO 50-30%, Al
2O
35.0-8.0%, SiO
2≤ 3.0%, S+P≤0.07%, C 0.7-1.4%, CaF
23.0-8.0%, H
2O≤0.2%.
2. ladle top slag deoxidation modification agent according to claim 1, it is characterized in that: the granularity of described Al is less than 1mm.
3. ladle top slag deoxidation modification agent according to claim 1, it is characterized in that: described modification agent granularity is 10-30mm.
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|---|---|---|---|
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| CN103614516A (en) * | 2013-11-13 | 2014-03-05 | 西峡县顺发新型炉料有限公司 | Compounded deoxidized material as well as preparation method and application thereof |
| CN103866087A (en) * | 2014-03-24 | 2014-06-18 | 莱芜钢铁集团有限公司 | Method for aluminum killed steel for online computation of FeO content in pit slag in low frequency (LF) refining furnace |
| CN105200192A (en) * | 2015-10-28 | 2015-12-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Liquid steel refining slag and preparation method and application thereof |
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| CN105755200A (en) * | 2016-03-09 | 2016-07-13 | 首钢京唐钢铁联合有限责任公司 | Ladle slag restructuring method |
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| CN103866087B (en) * | 2014-03-24 | 2016-01-27 | 莱芜钢铁集团有限公司 | A kind of method of FeO content in line computation LF refining furnace enters the station slag being applicable to al-killed class steel grade |
| CN105200192A (en) * | 2015-10-28 | 2015-12-30 | 攀钢集团攀枝花钢铁研究院有限公司 | Liquid steel refining slag and preparation method and application thereof |
| CN105671238A (en) * | 2016-02-03 | 2016-06-15 | 首钢总公司 | Modification method for cold-rolled sheet steel slag |
| CN105755200A (en) * | 2016-03-09 | 2016-07-13 | 首钢京唐钢铁联合有限责任公司 | Ladle slag restructuring method |
| CN106119462A (en) * | 2016-08-09 | 2016-11-16 | 安徽省无为县科力耐火炉料有限公司 | A kind of Al base ladle top slag modifier and the method improving its utilization rate |
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| CN111321276A (en) * | 2020-04-10 | 2020-06-23 | 北京首钢股份有限公司 | Method for improving yield of magnesium element in molten steel |
| CN111321276B (en) * | 2020-04-10 | 2021-12-03 | 北京首钢股份有限公司 | Method for improving yield of magnesium element in molten steel |
| 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 |
| CN113215360A (en) * | 2021-04-07 | 2021-08-06 | 邯郸钢铁集团有限责任公司 | Deoxidation method of aluminum killed silicon-containing steel |
| CN113420446A (en) * | 2021-06-25 | 2021-09-21 | 河钢乐亭钢铁有限公司 | Method for calculating steel strip slag output amount of converter |
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