CN102260769A - Ladle refining method for improving dynamical conditions by using ultrasonic wave - Google Patents
Ladle refining method for improving dynamical conditions by using ultrasonic wave Download PDFInfo
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- CN102260769A CN102260769A CN 201010181315 CN201010181315A CN102260769A CN 102260769 A CN102260769 A CN 102260769A CN 201010181315 CN201010181315 CN 201010181315 CN 201010181315 A CN201010181315 A CN 201010181315A CN 102260769 A CN102260769 A CN 102260769A
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Abstract
The invention discloses a ladle refining method for improving dynamical conditions by using ultrasonic wave. The problem of a stirring dead area produced by bottom blowing gas stirring is solved by introducing the ultrasonic wave to molten steel. The method comprises the following steps of: pouring the molten steel into a ladle after the molten steel is tapped from a converter or an electric furnace, placing the ladle at a refining station, blowing argon at the bottom of the ladle, stirring, adding slag formation and deoxidation materials, simultaneously starting an ultrasonic generator, introducing the ultrasonic wave to the bottom and the side wall of the ladle, and stirring the molten steel. The power of the ultrasonic wave is determined by the weight of the molten steel in the ladle, the power range of the ultrasonic wave is 5 to 500kW per ton of molten steel, and the introducing time of the ultrasonic wave is the ladle refining time. By the method, the inclusion content and the gas content of the molten steel can be reduced, and the ladle refining effect is remarkably improved.
Description
Technical field
The present invention relates to the method for ladle refining in the steelmaking process, particularly a kind of using ultrasound ripple improves the ladle refining method of dynamic conditions.
Background technology
Steel product quality is relevant with the purity of steel, in recent years, with the raising of user to the steel product quality requirement, purity to molten steel requires also corresponding raising, the Clean Steel smelting technology is the major subjects of steel-smelting technology research in the world always, molten steel desulfurizing, dephosphorization, the thermodynamic condition of reductor can be with sulphur in the molten steel, phosphorus, oxygen level is taken off to the utmost point low-level, satisfy the Clean Steel smelting condition, but ladle refining technological process medium power is learned condition and is mainly stirred by bottom blown gas, its effect is to utilize the characteristics in its circulation flow field to clean molten steel, uniform temperature, evenly composition promotes the metallurgical chemistry reaction.Steel ladle bottom argon blowing technology is to be blown into rare gas elementes such as argon gas by the gas permeable brick that is installed in ladle bottom in molten steel, make molten steel in ladle, produce circulation, molten steel is stirred, make fusing fast such as the alloy that is added in the molten steel, reductor, sweetening agent, disperse, impel molten steel component and temperature even, inclusion in the absorption molten steel is removed the nonmetal inclusion in the steel, thereby reaches the purpose of cleaning molten steel.But there is the circulation dead band in argon bottom-blowing flow hour in the ladle, can not full and uniformization molten steel component, temperature, if argon flow amount increases, cause that easily the molten steel face is exposed and roll, and increase the secondary oxidation chance.Pertinent literature: Tanghai swallow, Li Jingshe, Wang Jianbin etc., " the different Argon technologies of ladle refining are to the inclusion removal Research on effect ", " iron and steel " 2007,42 (4) 21-24.Argon flow amount is restricted by the strictness of bottom-blown air brick simultaneously, and it is very difficult to improve argon flow amount, and increase argon flow amount running cost is risen, and gas permeable brick easily obstruction sometimes, asynchronous with ladle life.Be subjected to the ladle bottom ventilated element to influence the bubble that BOTTOM ARGON BLOWING blows out longer through the flow process of molten steel than the air pocket floating-upward process, the diameter of bubble increases in uphill process, it is exposed that molten steel upper surface slag is blown, and causes the molten steel oxygen uptake, reduces desulfurization, dephosphorization efficient.Pertinent literature: Yoon B.H., Heo K.H., Kin JS.Improvement of Steel Cleanliness by Controlling Slag Composition[J], Ironmaking and Steelmaking, 2002,29 (3): 215 ~ 218.
Because gas stirring produces eddy current, problem such as the dead band of stirring is arranged, so adopt BOTTOM ARGON BLOWING to stir the desirable level that also far can not reach molten steel desulfurizing, dephosphorization, the desulfurization of reductor thermodynamics, dephosphorization, deoxidation, be dynamic conditions, can not satisfy the Clean Steel smelting requirements.
Ultrasonic wave is a kind of compression compressional wave, can in gas, liquid, solid and Solid solution, effect spread be arranged, has very strong penetrance, when propagating it in liquid, these natural characteristicss can transmit very strong energy, can on the interface, produce intensive and impact and cavatition, and equally can produce reflection, interference, stack and resonance effect with sound wave.At first attempting utilizing the work of ultrasonic applications in metallurgical process is the Sokolov professor of Saint-Petersburg State University, he proposes the using ultrasound wave inspection and carries out the series of studies pertinent literature that ultrasonic irradiation influences metallic crystalization: Yan Huicheng, Liu Liu, " applied research and the prospect of power ultrasonic in ferrous metallurgy ", " China is metallurgical " in August, 2002 the 4th phase (total the 59th phase).Surface quality and crystal grain thinning that square billet and slab are controlled in employing ultrasonic vibrations such as Kuznetsov prevent segregation.Pertinent literature: Kuznetsov B.G. " application [A] of the crystallizer of band ultrasonic vibration inwall ", continuous casting association of The Chinese Society for Metals, " first European continuous casting proceeding [C] ", Florence: Italian Metallkunde meeting .1991:697-700).Kobayashi M, scholar's research such as Hatanaka SI with the inclusion in the ultrasonication solution.Pertinent literature: Kobayashi M, Kamata C.Cold Mold Experiments of Removal from Molten Metal by an Irradiationof Ultrasonic Waves.ISIJ International, 1997,37 (1): 9～15.Professor Sang Yuanshou of Japan Nagoya university takes ultrasonic cavitation bubble and little research of penetrating with ultrasonic applications at foam metal material preparation, control foam slag height, employing high-speed camera.Pertinent literature: Iakashi KUBO, Mamoru KUWABARA and Jian YANG.Visualization ofacoustically induced cavitation bubbles and microjets with the aid of ahigh-speed camera.Japanese Journal of Applied Physics, 2005,44 (6B): 4647-4652; Sergey V.KOMAROV, Mamoru KUWABARA, OlegV.ABRAMOV.High power ultrasonics in pyrometallurgy:current statusand recent development.ISIJ international, 2005, (45) 12:1765-1782.People such as Zhao Zhongxing studied that when aluminium alloy casting hyperacoustic top imports and the bottom lead-in mode to the tissue influence of casting alloy.Pertinent literature: Zhao Zhongxing, " ultrasonic wave is to the homogenizing effect of alloy crystallisation process ", " heat processing technique " 1999, (5): 10～11.
Above document mainly introduced ultrasonic wave in metallurgical process to the influence of metal inside tissue, the ultrasonic applications aspect ladle refining is not proposed.
Summary of the invention
The invention provides the ladle refining method that a kind of using ultrasound ripple improves dynamic conditions, import ultrasonic wave in molten steel, solve bottom blown gas and stir existence stirring dead-time problem, improve mixing effect, remove molten steel impurity, removal is mingled with, and produces Clean Steel.
Using ultrasound ripple provided by the invention improves the ladle refining method of dynamic conditions, comprises following content:
Behind converter or electric furnace steel tapping, molten steel is poured in the ladle, ladle is placed the refining station, begin blowing argon gas at ladle bottom and stir, add slag making and deoxidation material, open ultrasonic generator simultaneously, in ladle bottom and sidewall input ultrasonic wave, molten steel is stirred.Hyperacoustic power is by the weight decision of molten steel in the ladle, and the ultrasonic power scope is a 5-500kW/ ton molten steel, and be that ladle refining finishes the used time hyperacoustic input time.
Described using ultrasound ripple improves the ladle refining method of dynamic conditions, stirs at both sides, ladle bottom central position blowing argon gas, imports ultrasonic wave on equally distributed four positions on ladle bottom center and the sidewall.
The ultrasonic generator that described using ultrasound ripple improves the ladle refining method employing of dynamic conditions is a PZT (piezoelectric transducer), at the logical recirculated cooling water of PZT (piezoelectric transducer) and ladle liner contact site.
The present invention compares with existing ladle refining method, and its significant beneficial effect embodies in the following areas:
1. ultrasonicly produce the finite amplitude decay when in melt, propagating and make in the liquid and begin to form certain acoustic pressure gradient from sound source, cause flowing of liquid, under the high-energy ultrasonic situation, when sound pressure amplitude surpasses certain value, can produce a fluidic in the liquid sprays, make molten metal to stir up and down, thereby make molten metal on macroscopic view, be subjected to certain stirring action, can obviously improve the homogeneity of molten steel temperature field and composition.Ultrasonic agitation has good degassification, and a large amount of cavitation bubbles of generation have obviously increased the solution-air area that contacts, and prolongs the bubble floating time, helps absorption and removes inclusion.
2. ultrasonic wave has cavitation effect, when cavitation bubble breaks, forms so-called " focus ", produces the intensive shockwave, and chemical reaction is played tangible booster action.
3. ultrasonic wave makes liquid the turbulent mechanical characteristic occur, reduce diffusional resistance, the solid surface film is destroyed, quickened mass transfer process, can significantly improve the reacting dynamics condition of ladle refining, thereby improve effects such as desulfurization, alloying, intensification and control inclusion morphology.
4. ultrasonic source is arranged on ladle bottom and Bao Bi, act on gas stirring and stir dead zone location, stir acting in conjunction with bottom blown gas, strengthen mixing effect, can improve the dynamic conditions of ladle refining, approach between the slag steel and remove the thermodynamics of reactions balance of gas, can shorten refining time more than 10 minutes, reduce molten steel and be mingled with and gas content, improve the ladle refining effect.
Description of drawings
Fig. 1 is the ladle cross-sectional view that the using ultrasound ripple improves the ladle refining method employing of dynamic conditions.
Embodiment
As shown in Figure 1, the using ultrasound ripple improves the ladle refining method of dynamic conditions, implements by following process:
A circular piezoelectric transverter 4 is set at the ladle bottom center, ultrasonic source is provided, equally distributed four positions are provided with four circular piezoelectric transverters 4 on the ladle sidewall, and ultrasonic source is provided, at the logical recirculated cooling water 5 in the position that PZT (piezoelectric transducer) contacts with ladle liner 2.Argon bottom-blowing 3 inlets are set in the both sides of circular piezoelectric transverter 4.Behind converter or electric furnace steel tapping, molten steel 1 is poured in the ladle, ladle is placed the refining station, begin blowing argon gas 3 at ladle bottom and stir, add slag making and deoxidation material, be open at the circular piezoelectric transverter 4 of ladle bottom center and sidewall simultaneously, the input ultrasonic wave stirs molten steel 1.Each ultrasound waves source power is 10 * ladle molten steel gross weight kW, and be that ladle refining finishes the used time hyperacoustic input time.
Claims (3)
1. a using ultrasound ripple improves the ladle refining method of dynamic conditions, it is characterized in that this method comprises following content:
Behind converter or electric furnace steel tapping, molten steel is poured in the ladle, ladle is placed the refining station, begin blowing argon gas at ladle bottom and stir, add slag making and deoxidation material, open ultrasonic generator simultaneously, in ladle bottom and sidewall input ultrasonic wave, molten steel is stirred, hyperacoustic power is by the weight decision of molten steel in the ladle, the ultrasonic power scope is a 5-500kW/ ton molten steel, and be that ladle refining finishes the used time hyperacoustic input time.
2. using ultrasound ripple according to claim 1 improves the ladle refining method of dynamic conditions, it is characterized in that stirring at both sides, said ladle bottom center blowing argon gas, imports ultrasonic wave on equally distributed four positions on ladle bottom center and the sidewall.
3. using ultrasound ripple according to claim 1 improves the ladle refining method of dynamic conditions, it is characterized in that at said ultrasonic generator be PZT (piezoelectric transducer), at the logical recirculated cooling water of PZT (piezoelectric transducer) and ladle liner contact site.
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| CN 201010181315 CN102260769A (en) | 2010-05-25 | 2010-05-25 | Ladle refining method for improving dynamical conditions by using ultrasonic wave |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994701A (en) * | 2012-11-30 | 2013-03-27 | 鞍钢股份有限公司 | Method for thinning size of argon gas bubbles during refining |
| CN103924097A (en) * | 2013-10-31 | 2014-07-16 | 中南大学 | Ultrasonic/inert gas combined degassing technology |
| CN107502764A (en) * | 2017-08-30 | 2017-12-22 | 河钢股份有限公司承德分公司 | A kind of method for smelting vanadium system alloy |
| CN109295280A (en) * | 2018-11-24 | 2019-02-01 | 宁波市神光电炉有限公司 | A kind of exclusion device and impurity-removing method of medium frequency induction melting furnace |
| CN109576439A (en) * | 2018-12-28 | 2019-04-05 | 刘玉满 | Steel water high-frequency vibration sublimate homogenizes method of refining |
| CN112375873A (en) * | 2020-11-13 | 2021-02-19 | 李金芳 | Distributed ultrasonic signal detection system for steelmaking production |
| US20220128303A1 (en) * | 2019-02-07 | 2022-04-28 | Institut Polytechnique De Grenoble | Cold crucible |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102994701A (en) * | 2012-11-30 | 2013-03-27 | 鞍钢股份有限公司 | Method for thinning size of argon gas bubbles during refining |
| CN103924097A (en) * | 2013-10-31 | 2014-07-16 | 中南大学 | Ultrasonic/inert gas combined degassing technology |
| CN107502764A (en) * | 2017-08-30 | 2017-12-22 | 河钢股份有限公司承德分公司 | A kind of method for smelting vanadium system alloy |
| CN109295280A (en) * | 2018-11-24 | 2019-02-01 | 宁波市神光电炉有限公司 | A kind of exclusion device and impurity-removing method of medium frequency induction melting furnace |
| CN109576439A (en) * | 2018-12-28 | 2019-04-05 | 刘玉满 | Steel water high-frequency vibration sublimate homogenizes method of refining |
| US20220128303A1 (en) * | 2019-02-07 | 2022-04-28 | Institut Polytechnique De Grenoble | Cold crucible |
| CN112375873A (en) * | 2020-11-13 | 2021-02-19 | 李金芳 | Distributed ultrasonic signal detection system for steelmaking production |
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Application publication date: 20111130 |