CN101701281A - Premelted refining slag for refining low-oxygen steel by converter - Google Patents
Premelted refining slag for refining low-oxygen steel by converter Download PDFInfo
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- CN101701281A CN101701281A CN200910227945A CN200910227945A CN101701281A CN 101701281 A CN101701281 A CN 101701281A CN 200910227945 A CN200910227945 A CN 200910227945A CN 200910227945 A CN200910227945 A CN 200910227945A CN 101701281 A CN101701281 A CN 101701281A
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- refining
- slag
- converter
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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 discloses a premelted refining slag for refining low-oxygen steel by a converter, belonging to the technical field of metallurgy and steelmaking. The invention is characterized in that the premelted refining slag comprises the following chemical compositions in percentage by weight: 53.0-58.0% of CaO, 28.0-32.0% of Al2O3, 3.0-8.0% of MgO, less than or equal to 6.0% of SiO2, less than or equal to 5.0% of CaF2, less than or equal to 0.3% of TiO2, less than or equal to 0.05% of B, less than or equal to 0.03% of P and less than or equal to 0.2% of S. According to the aim and the function of the CaO-Al2O3 slag system, the invention designs premelted refining slag chemical composition proportioning; the premelted refining slag can be used for quickly forming refining slag with favourable mobility and reducibility as well as high alkalinity in the LF refining process so as to cause LF to adapt to the technical characteristics of the converter, thus efficiently finishing desulfuration and deoxidation, removing impurities and refining; the invention satisfies the production requirements of low-oxygen high-quality converter steel and realizes the aim of low-oxygen steel.
Description
Technical field
The present invention relates to a kind of converter steelmaking with refining slag and preparation method, particularly Premelted refining slag for refining low-oxygen steel by converter, belong to metallurgical steelmaking technical field.
Background technology
Quality carbon steel is produced in converter, special steel technology is constantly developed in recent years.Because the LF refining furnace has electric-arc heating function, thermo-efficiency height, the temperature regulation ability is strong, have and stir and the alloying function, can realize characteristics such as trimming and accurate control, become the important refining support equipment of converter steel at the very start very soon in the production of converter quality carbon steel, along with the demand of vacuum refinement, progressively formed the converter Clean Steel technological process of production of BOF-LF-VD (RH)-CC quaternity.Wherein the LF refining furnace is the key link that guarantees the molten steel clean level, also is one of limiting element of stove machine coupling.The relative eccentric bottom tapping technology of electric furnace, converter steelmaking tapping pushing off the slag is a difficult problem, and the finishing slag that can have a certain amount of hyperoxia voltinism in tapping process unavoidably enters ladle, and this gives follow-up LF refining rhythm and deoxidation, go to be mingled with refining has increased difficulty.The process characteristic that how to adapt to converter, by the tapping slag making, the pro-molten refining slag that adds certain function, realize the quick upgrading of converter oxidation sludge, and form high basicity, good fluidity, refining slag that reducing power is strong fast in LF refining furnace early stage, coupling linking and high-level efficiency for integrated artistic finished purified desulfurization, deoxidation, gone to be mingled with very key of refining task, and the Application and Development of pro-molten refining slag is subjected to more and more insiders' attention for this reason.
Summary of the invention
Technical problem to be solved by this invention provides a kind of high basicity of the quick formation of refining furnace, refining slag that deoxidizing capacity is strong of guaranteeing, satisfies converter-LF purified Premelted refining slag for refining low-oxygen steel by converter.
The alleged problem of the present invention is solved by following technical scheme:
A kind of Premelted refining slag for refining low-oxygen steel by converter, its special feature is: described pro-molten refining slag chemical component weight per-cent is as follows: CaO 53.0～58.0%, Al
2O
328.0～32.0%, MgO 3.0～8.0%, SiO
2≤ 6.0%, CaF
2≤ 5.0%, TiO
2≤ 0.3%, B≤0.05%, P≤0.03%, S≤0.2%.
Above-mentioned Premelted refining slag for refining low-oxygen steel by converter, described pro-molten refining slag chemical component weight per-cent is preferably as follows: CaO55.0～58.0%, Al
2O
330.0～32.0%, MgO3.0～7.0%, SiO
2≤ 6.0%, CaF
2≤ 4.0%, TiO
2≤ 0.2%, B≤0.04%, P≤0.02%, S≤0.2%.
Above-mentioned Premelted refining slag for refining low-oxygen steel by converter, described pro-molten refining slag granularity 5～35mm, H
2O≤0.2%.
The present invention is according to CaO-Al
2O
3The target of slag system and function, design pro-molten refining slag chemical ingredients proportioning, this pro-molten refining slag cooperates a certain amount of lime to add in the ladle at tapping process, form flowability, the good high basicity refining slag of reductibility fast at the LF refining process, make LF adapt to the converter process characteristics, efficiently finish desulfurization, deoxidation, removal and be mingled with the refining task, satisfy hypoxemia high-quality converter steel and produce needs, realize the target of low-oxygen steel.Adopt pro-molten refining slag of the present invention, converter bearing steel averaged oxygen content is by 9.2 * 10
-6, be reduced to 7.0 * 10
-6, on average descend 24%; Converter Pinion Steel averaged oxygen content is by 13.4 * 10
-6, be reduced to 9.8 * 10
-6, on average descend 25%.
Embodiment
The LF refining slag is the most critical factor that LF realizes the refining task, by refining slag, realizes purified desulfurization, deoxidation, inclusion absorption removal effect.In studying for a long period of time and putting into practice, the LF refining slag mainly forms CaO-CaF
2Slag system, CaO-Al
2O
3Slag system, CaO-Al
2O
3-CaF
2Slag system etc., wherein CaO-Al
2O
3Slag system has a lot of good metallurgy characteristics, as the basicity height, sweetening power is strong, the oxygen gesture is low, can play the diffusive deoxidation effect, and good fluidity, it is strong to absorb the inclusion ability, and not fluorine-containing or low fluorine alleviates the erosion of furnace lining etc., because it is to CaO and Al
2O
3Have very strong carrying capacity, therefore can have the LF refining slag of strong desulfurization, deoxidizing capacity with addition of formation such as a large amount of lime, whipping agents.
The present invention is according to CaO-Al
2O
3The target of slag system and function are designed Premelted refining slag for refining low-oxygen steel by converter through further investigation and repetition test, outstanding relatively low Al in the described pro-molten refining slag
2O
3Content, and strict control TiO
2, B content, its mentality of designing is as follows: the design of traditional pro-molten refining slag lays particular emphasis on low melting point more, thereby Al in the component formation
2O
3Generally higher.This slag is because CaO/Al
2O
3Relatively low, Al
2O
3Reduce the activity of CaO, quite reduced basicity, influenced the best performance of deoxidization desulfuration effect.The present invention takes all factors into consideration basicity and fusing point, CaO/Al
2O
3Value be controlled at 1.66～2.07, the one, improve the basicity of refining slag as far as possible, the 2nd, reduce the fusing point of refining slag as far as possible, equally with CaO-Al
2O
3Phasor is a foundation, but abandons 12CaO.7Al commonly used
2O
3Prescription, CaO, Al
2O
3Component ratio with more low-melting 3CaO.Al
2O
3Be target, promptly be referred to as non-12CaO.7Al
2O
3The slag system pro-molten refining slag is better taken into account high basicity of pre-melted slag and the dual performance requriements of low melting point.In addition, restriction SiO
2, CaF
2Content, simultaneously to steel quality have considerable influence trace ingredients P, S, carry out strictness restriction, keep the content of certain MgO, be beneficial to the protection of furnace lining.Pro-molten refining slag of the present invention is to TiO
2, B content carries out strictness control, this also is to put into practice the experience that draws, TiO according to long-term steel-making
2≤ 0.3%, low TiO
2Help reaching TiO in the steel such as control bearing steel, spring steel
2, TiN is mingled with, and improves the purpose of fatigue lifetime; B≤0.05%, strict restriction B content, the may command slag causes the fluctuation of B in the steel, and then eliminates the hardening capacity labile factor of protecting the hardening capacity steel.
Below provide embodiment:
Premelted refining slag for refining low-oxygen steel by converter chemical component weight per-cent such as table 1:
Table 1 (%)
Pro-molten refining slag of the present invention selects for use raw materials such as lime, alumine, magnesia according to chemical ingredients target proportioning, after melting fully in High Temperature Furnaces Heating Apparatuss such as electric furnace, through cooling, is broken into the particle of 5～35mm, the steel-making use of packing back.
Described pro-molten refining slag adds ladle in the converter tapping process with the lime of equivalent, LF arrives at a station and promptly forms the white slag of good fluidity, and further after the diffusive deoxidation, inclusion floating is removed, both guarantee the refining rhythm of converter steel, realized good low-oxygen steel production effect again.After test showed that this pro-molten refining slag goes into to use, converter bearing steel averaged oxygen content was by 9.2 * 10
-6, be reduced to 7.0 * 10
-6, on average descend 24%; Converter Pinion Steel averaged oxygen content is by 13.4 * 10
-6, be reduced to 9.8 * 10
-6, on average descend 25%.
Table 2 provides part heat LF refining slag (%) in early stage and final steel oxygen level situation:
Table 2
Annotate: 1. basicity R2---slag dual alkalinity, i.e. CaO/Al
2O
3Ratio.
2.T.O---steel total oxygen content, unit * 10
-6
Claims (3)
1. Premelted refining slag for refining low-oxygen steel by converter, it is characterized in that: described pro-molten refining slag chemical component weight per-cent is as follows: CaO 53.0～58.0%, Al
2O
328.0～32.0%, MgO 3.0～8.0%, SiO
2≤ 6.0%, CaF
2≤ 5.0%, TiO
2≤ 0.3%, B≤0.05%, P≤0.03%, S≤0.2%.
2. Premelted refining slag for refining low-oxygen steel by converter according to claim 1 is characterized in that: described pro-molten refining slag chemical component weight per-cent is preferably as follows: CaO55.0～58.0%, Al
2O
330.0～32.0%, MgO3.0～7.0%, SiO
2≤ 6.0%, CaF
2≤ 4.0%, TiO
2≤ 0.2%, B≤0.04%, P≤0.02%, S≤0.2%.
3. Premelted refining slag for refining low-oxygen steel by converter according to claim 1 and 2 is characterized in that: described pro-molten refining slag granularity 5～35mm, H
2O≤0.2%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910227945A CN101701281A (en) | 2009-12-04 | 2009-12-04 | Premelted refining slag for refining low-oxygen steel by converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910227945A CN101701281A (en) | 2009-12-04 | 2009-12-04 | Premelted refining slag for refining low-oxygen steel by converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101701281A true CN101701281A (en) | 2010-05-05 |
Family
ID=42156208
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|---|---|---|---|
| CN200910227945A Pending CN101701281A (en) | 2009-12-04 | 2009-12-04 | Premelted refining slag for refining low-oxygen steel by converter |
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|---|---|
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|---|---|---|---|---|
| CN102002556A (en) * | 2010-12-01 | 2011-04-06 | 北京科技大学 | Rare earth oxide-containing steelmaking refining slag, and preparation method and using method thereof |
| CN102010931A (en) * | 2010-10-13 | 2011-04-13 | 山西太钢不锈钢股份有限公司 | Slagging method for reducing inclusions in boiler refractory steel |
| CN102560131A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Premelted refining slag and preparation method thereof |
| CN102560006A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of ferrovanadium slag and premelted refining slag |
| CN102851453A (en) * | 2012-10-09 | 2013-01-02 | 莱芜钢铁集团有限公司 | Composite refining slag for special-shaped blank molten steel smelting, and preparation method and application thereof |
| CN102864285A (en) * | 2012-10-26 | 2013-01-09 | 北京科技大学 | High-alkalinity synthetic slag for pipeline steel secondary refining |
| CN102912082A (en) * | 2012-10-26 | 2013-02-06 | 北京科技大学 | Low-alkalinity synthetic slag for external refining of boiler tube steel |
| CN103060527A (en) * | 2013-02-04 | 2013-04-24 | 山西太钢不锈钢股份有限公司 | Slagging method of axle steel LF (Ladle Refining) furnace |
| CN104250674A (en) * | 2013-06-27 | 2014-12-31 | 宜兴市瑞华工业炉科技有限公司 | Refined synthetic slag for smelting high-standard bearing steel and preparation method thereof |
| CN104342533A (en) * | 2013-07-31 | 2015-02-11 | 沈阳铸造研究所 | Special slag forming agent for smelting steel containing active elements and preparation method thereof |
| CN105154625A (en) * | 2015-07-25 | 2015-12-16 | 东北大学 | Preparation method for refining slag for smelting bearing steel |
| CN106048124A (en) * | 2016-06-03 | 2016-10-26 | 江苏沙钢集团淮钢特钢股份有限公司 | Technique for producing train axle steel through molten iron and stepped argon blowing sealing structure for technique |
| WO2019004339A1 (en) * | 2017-06-28 | 2019-01-03 | 新日鐵住金株式会社 | Steelmaking slag for use as fertilizer starting material, method for producing steelmaking slag for use as fertilizer starting material, method for producing fertilizer, and fertilization method |
| WO2019004357A1 (en) * | 2017-06-28 | 2019-01-03 | 新日鐵住金株式会社 | Steelmaking slag for use as fertilizer starting material, method for producing steelmaking slag for use as fertilizer starting material, method for producing fertilizer, and fertilization method |
| CN109628698A (en) * | 2019-01-10 | 2019-04-16 | 鞍钢股份有限公司 | Pre-melted refined desulphurization slag for pipeline steel and preparation method thereof |
| CN114517246A (en) * | 2022-03-21 | 2022-05-20 | 新疆八一钢铁股份有限公司 | Pre-melted slag for steel-making refining process |
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-
2009
- 2009-12-04 CN CN200910227945A patent/CN101701281A/en active Pending
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|---|---|---|---|---|
| CN102010931A (en) * | 2010-10-13 | 2011-04-13 | 山西太钢不锈钢股份有限公司 | Slagging method for reducing inclusions in boiler refractory steel |
| CN102010931B (en) * | 2010-10-13 | 2012-09-05 | 山西太钢不锈钢股份有限公司 | Slagging method for reducing inclusions in boiler refractory steel |
| CN102002556B (en) * | 2010-12-01 | 2013-01-30 | 北京科技大学 | Rare earth oxide-containing steelmaking refining slag, and preparation method and using method thereof |
| CN102002556A (en) * | 2010-12-01 | 2011-04-06 | 北京科技大学 | Rare earth oxide-containing steelmaking refining slag, and preparation method and using method thereof |
| CN102560131B (en) * | 2011-12-28 | 2014-02-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Premelted refining slag and preparation method thereof |
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| CN102560006A (en) * | 2011-12-28 | 2012-07-11 | 攀钢集团攀枝花钢铁研究院有限公司 | Utilization method of ferrovanadium slag and premelted refining slag |
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| CN102912082A (en) * | 2012-10-26 | 2013-02-06 | 北京科技大学 | Low-alkalinity synthetic slag for external refining of boiler tube steel |
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| CN109628698A (en) * | 2019-01-10 | 2019-04-16 | 鞍钢股份有限公司 | Pre-melted refined desulphurization slag for pipeline steel and preparation method thereof |
| CN114517246A (en) * | 2022-03-21 | 2022-05-20 | 新疆八一钢铁股份有限公司 | Pre-melted slag for steel-making refining process |
| CN115011752A (en) * | 2022-05-24 | 2022-09-06 | 石家庄钢铁有限责任公司 | Method for controlling slag alkalinity by adopting limestone for steelmaking of converter |
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Open date: 20100505 |