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WO1998058088A1 - Procede et cuve metallurgique permettant d'introduire une substance de valeur dans un bain de fusion - Google Patents

Procede et cuve metallurgique permettant d'introduire une substance de valeur dans un bain de fusion Download PDF

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Publication number
WO1998058088A1
WO1998058088A1 PCT/AT1998/000133 AT9800133W WO9858088A1 WO 1998058088 A1 WO1998058088 A1 WO 1998058088A1 AT 9800133 W AT9800133 W AT 9800133W WO 9858088 A1 WO9858088 A1 WO 9858088A1
Authority
WO
WIPO (PCT)
Prior art keywords
bath
metallurgical vessel
valuable substance
molten bath
molten
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/AT1998/000133
Other languages
German (de)
English (en)
Inventor
Norbert Ramaseder
Leopold Werner Kepplinger
Eva-Maria Kern
Hermann Schubert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Primetals Technologies Austria GmbH
Original Assignee
Voest Alpine Industrienlagenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voest Alpine Industrienlagenbau GmbH filed Critical Voest Alpine Industrienlagenbau GmbH
Publication of WO1998058088A1 publication Critical patent/WO1998058088A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D27/00—Stirring devices for molten material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/466—Charging device for converters
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/18—Charging particulate material using a fluid carrier
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • C21C5/466—Charging device for converters
    • C21C2005/4666—Charging device for converters for charging with organic contaminated scrap
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/527—Charging of the electric furnace
    • C21C2005/5282—Charging of the electric furnace with organic contaminated scrap
    • 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

Definitions

  • the invention relates to a method for introducing a valuable substance, either in particulate form, in particular in the form of dust, or in liquid form, into a molten bath located in a metallurgical vessel, in particular into a molten steel bath, in which a bath stirring movement is generated by means of at least one molten bath stirring device is, as well as a metallurgical vessel for performing the method.
  • the object of the invention is to introduce a valuable substance into the molten bath in such a way that the valuable substance fully takes effect in the molten bath.
  • the energy content of the valuable substance should be used as completely as possible directly in the molten bath.
  • the valuable substance carbon should be able to be used as an energy carrier by being in solution as completely as possible.
  • the recyclable material should also have a metallurgical effect directly in the melt.
  • the valuable substance is introduced into the melt pool by means of at least one introduction device which is provided independently of the melt pool resting device, in an area of the melt pool in which a bath stirring movement with a downward movement or, when the valuable substance is introduced, below the melt pool Surface, such as in the lower region of the melting bath, is generated with a movement component directed approximately parallel to the base region of the metallurgical vessel.
  • EP-B-0 521 844 discloses blowing shredder waste into the high-temperature melting zone of a scrap-melting reactor and using it energetically by burning. However, the shredder waste is blown directly into the scrap to be melted and therefore does not come into contact with the melt, or comes into contact with it only slightly, which results in a slight interaction of the material introduced with the melt.
  • DE-A-32 12 534 discloses a process for the gasification of household waste and similar wastes in an iron melt, in which the wastes are pressed into the iron melt below the surface thereof.
  • a disadvantage of this method is the low interaction with the melt pool due to the short residence time of the introduced material in the melt pool.
  • the method according to the invention further ensures that when carbon-containing materials are introduced as the valuable material, the carbon dissolves, which means that it can be used, if necessary, metallurgically.
  • the temperature of the molten bath and the residence time can be selected so that graphite is formed in the molten bath. It is essential here that the material introduced must find the greatest possible path length in the weld pool. This path length (and thus the length of stay in the melt) depending on the insertion angle, medium, flow rate, pressure and on the movement of the weld pool in the area of the insertion device.
  • the method according to the invention also has the consequence that no organically bound carbon gets into the furnace space, but is already converted to CO in the molten bath. This prevents the formation of dioxins and furans in the exhaust gas from the melting unit.
  • the valuable substance is particularly advantageously introduced into the molten bath in finely dispersed form.
  • the valuable substance is particularly advantageously introduced into the molten bath in finely dispersed form.
  • the valuable substance is preferably introduced with a movement component in the direction of the bath stirring movement generated in the insertion area.
  • the bath stirring movement is advantageously supported by the pumped medium for the valuable substance.
  • the valuable material is introduced into the molten bath through at least one under bath opening arranged in the side wall of the metallurgical vessel at at least one point at which a bath stirring movement is generated with a horizontal and / or downward movement component of the molten bath the material introduced into the molten bath is initially conveyed approximately parallel to the side wall of the metallurgical vessel and preferably downwards, thereby maximizing the length of time in the molten bath.
  • the valuable substance is introduced into the weld pool through at least one bottom opening at at least one point at which one Bath stirring movement is generated with a movement component of the melting bath oriented approximately parallel to the bottom region of the metallurgical vessel.
  • the residence time of the introduced material is also increased compared to the case in which the melting bath is not moved and the introduced material rises vertically upwards.
  • the valuable material is introduced into the molten pool from at least one lance from at least one lance, preferably a wear lance, at which a bath stirring movement with a downward movement component of the molten bath is generated pulled the weld pool
  • the bath stirring movement is advantageously produced by direct current flow in the weld pool, preferably by means of an arc which is formed on at least one electrode directed onto the surface of the bath, a bath movement downward being generated by the current flow from the electrode into the bath.
  • the valuable substance is advantageously introduced into an area between electrodes directed at the surface of the molten bath
  • the bath stirring movement is generated by induction.
  • the valuable substance is introduced into the downward flow of the molten bath formed thereby.
  • a metallurgical vessel for carrying out the method according to the invention with a vessel space receiving a molten bath, with at least one molten bath resting device and with at least one introduction device for a valuable substance, either in particle form, in particular in the form of dust, or in liquid form, is characterized in this way that the introduction device for the valuable substance is structurally separated from the melting bath resting device and is arranged at a point on the metallurgical vessel or in the vessel space in the area of which the melting bath is either directed downwards or, when the valuable substance is introduced, below the surface of the melting bath, such as in the lower region of the melting bath, has a movement component directed approximately parallel to the base region of the metallurgical vessel
  • the introduction device for the valuable substance advantageously has an orifice pointing in the direction of the bath stirring movement. This makes it easier to take the introduced recyclable material with the bath stirring movement or is supported by a conveying medium for the recyclable material.
  • the introduction device for the valuable material is designed as at least one under bath opening, preferably as an under bath nozzle, which is arranged in the side wall of the metallurgical vessel.
  • a nozzle suitable as an underbath nozzle is known, for example, from DE-C-42 38 020.
  • the introduction device for the valuable material is designed as at least one bottom opening, preferably as a bottom nozzle, or according to yet another embodiment as at least one lance from above, preferably as a wear lance.
  • the molten bath stirring device is expediently designed as at least one electrode directed towards the molten bath surface.
  • the lance for introducing the valuable substance is preferably arranged between electrodes directed onto the surface of the molten bath.
  • the melt bath stirring device is designed as an induction coil which generates a bath stirring movement directed downward.
  • the molten bath stirring device is designed as an induction coil which generates a bath stirring movement about a vertical axis.
  • FIGS. 1 to 3 illustrating preferred exemplary embodiments of the method according to the invention or of the metallurgical vessel according to the invention.
  • a metallurgical vessel 1 for example an electric arc furnace (EAF), for holding a melting bath 2, in the example shown a steel melting bath.
  • the metallurgical vessel 1 is provided with a refractory lining 3.
  • a valuable substance F4 is introduced into the molten bath 2 by means of an introduction device 5, which is designed as an under bath nozzle 7 arranged below the molten bath surface 6.
  • Shredder light fraction is introduced as recyclable material 4; however, other carbon-containing materials, in particular comminuted materials, can equally be used Plastic waste and / or plastic-containing residues, iron oxide-containing materials, in particular metallurgical dust, and alloying elements, for example chromium, titanium, tungsten, nickel, cobalt, vanadium, molybdenum and others, as well as non-metallic feedstocks, in particular fluxing agents and slag formers, for example lime, and liquid carbon carriers are introduced .
  • a bath stirring movement 8 is generated by means of a melt bath stirring device 9, which in the exemplary embodiment shown in FIG. 1 is designed as an induction coil 10, the bath stirring movement 8 being directed downwards along the side wall 11 of the metallurgical vessel 1 and in the bottom region 12 of the metallurgical vessel 1 is directed approximately parallel to the bottom region 12. It is important here that the bath stirring movement 8 is directed downward in the region of the mouth 13 of the lower bath nozzle 7. As a result, the valuable substance 4 is taken downwards, thereby maximizing its path and thus its length of stay in the molten bath 2. In the example shown, the length of stay is more than doubled.
  • the path of the recyclable material 4 introduced into the molten bath 2 is indicated in FIG. 1 by arrow 14.
  • the mouth 13 of the lower bath nozzle 7 is in the direction of the bath stirring movement 8 generated in the insertion area 15, i.e. also directed downwards.
  • the residence time of the shredder light fraction used in this exemplary embodiment as recyclable material 4 in the molten bath 2 is extended so far that the carbon introduced with the shredder light fraction dissolves.
  • the temperature of the melt pool 2 and the residence time are chosen so that graphite formation in the melt pool 2 is possible.
  • the light shredder fraction is advantageously introduced into the molten bath 2 in finely dispersed form.
  • finely dispersed form there is an additional extension of the residence time in the melt pool 2 and thus a particularly intensive interaction of the shredder light fraction with the melt pool 2, as well as their optimal use of energy.
  • a metallurgical vessel 1 is equipped with a floor nozzle 17 provided in the floor area 12 for introducing a valuable material 4 - in this example again a shredder light fraction.
  • a bath stirring movement 8 is generated such that the movement component 8a in the area of the mouth 18 of the floor nozzle 17 is directed approximately parallel to the floor area 12 of the metallurgical vessel 1.
  • the upward movement of the recyclable material 4 is deflected sideways, as illustrated by the arrows 14 in FIG. 2.
  • This measure also leads to an optimization, ie an extension, of the residence time of the valuable substance 4 in the molten bath 2, in particular if the valuable substance 4 is introduced into the molten bath 2 in finely dispersed form.
  • a conveying device 19 indicated in FIG. 2 serves to convey the valuable substance 4 in finely dispersed form.
  • the valuable material 4 is introduced into the molten bath 2 by means of a lance 20, for example a wear lance, in the vicinity 21 of the electrode 22 which is directed towards the molten bath surface 6.
  • a downward bath stirring movement 8 is generated by the arc 23.
  • the material 4 introduced by means of the lance 20 is first pulled downward by the bath stirring movement 8 - as can be seen by the arrows 14 - and continues to follow the circulating movement of the melting bath 2 indicated by 8b. This maximizes the residence time of the material 4 in the melting bath 2.
  • the method according to the invention or the metallurgical vessel 1 according to the invention is in no way limited to the embodiments shown in FIGS. 1 to 3.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Processing Of Solid Wastes (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Furnace Details (AREA)

Abstract

Procédé permettant d'introduire une substance de valeur (4), soit sous forme de particules, en particulier sous forme de poussières, soit sous forme liquide, dans un bain de fusion (2), en particulier un bain de fusion d'acier, contenu dans une cuve métallurgique (1) dans laquelle est produite un mouvement (8) de mélange de bain à l'aide d'au moins un dispositif de mélange (9) de bain de fusion. La substance de valeur (4) est introduite dans le bain de fusion (2) à l'aide d'au moins un dispositif d'alimentation (5), qui est indépendant du dispositif de mélange (9) du bain de fusion, dans une zone du bain de fusion (2) dans laquelle un mouvement de mélange (8) du bain est produit avec une composante de mouvement dirigée vers le bas ou, lorsque la substance de valeur (4) est introduite sous la surface (6) du bain de fusion, comme par ex. dans la zone inférieure du bain de fusion (2), avec une composante de mouvement sensiblement parallèle à la zone de fond (12) de la cuve métallurgique (1).
PCT/AT1998/000133 1997-06-16 1998-05-26 Procede et cuve metallurgique permettant d'introduire une substance de valeur dans un bain de fusion Ceased WO1998058088A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0104097A AT405188B (de) 1997-06-16 1997-06-16 Verfahren zum einbringen eines wertstoffs in ein schmelzbad und metallurgisches gefäss zur aufnahme eines schmelzbads
ATA1040/97 1997-06-16

Publications (1)

Publication Number Publication Date
WO1998058088A1 true WO1998058088A1 (fr) 1998-12-23

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PCT/AT1998/000133 Ceased WO1998058088A1 (fr) 1997-06-16 1998-05-26 Procede et cuve metallurgique permettant d'introduire une substance de valeur dans un bain de fusion

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AT (1) AT405188B (fr)
WO (1) WO1998058088A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118755972A (zh) * 2024-06-17 2024-10-11 广东红荔枝新材料科技有限公司 一种铝合金的熔炼工艺及其熔炼设备

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791813A (en) * 1971-07-09 1974-02-12 Allegheny Ludlum Ind Inc Method for injecting a gaseous reacting agent into a bath of molten metal
EP0124689A1 (fr) * 1983-02-12 1984-11-14 Daido Tokushuko Kabushiki Kaisha Méthode d'affinage de l'acier au moyen de laitier
EP0521844A1 (fr) * 1991-06-28 1993-01-07 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour l'utilisation énergétique de déchets de ferraille déchiquetée
EP0579591A1 (fr) * 1992-07-16 1994-01-19 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour la production d'une fonte d'acier
WO1994003294A1 (fr) * 1992-08-07 1994-02-17 Asea Brown Boveri Ab Procede et dispositif d'agitation d'un metal en fusion
DE19535014A1 (de) * 1995-09-21 1997-03-27 Stein Ind Anlagen Inh Christel Verfahren zum Einbringen von körnigen Feststoffen in Metallschmelzen
EP0772015A1 (fr) * 1995-03-31 1997-05-07 Nippon Steel Corporation Procede et dispositif de prechauffage et de fusion de ferraille

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3791813A (en) * 1971-07-09 1974-02-12 Allegheny Ludlum Ind Inc Method for injecting a gaseous reacting agent into a bath of molten metal
EP0124689A1 (fr) * 1983-02-12 1984-11-14 Daido Tokushuko Kabushiki Kaisha Méthode d'affinage de l'acier au moyen de laitier
EP0521844A1 (fr) * 1991-06-28 1993-01-07 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour l'utilisation énergétique de déchets de ferraille déchiquetée
EP0579591A1 (fr) * 1992-07-16 1994-01-19 Voest-Alpine Industrieanlagenbau Gmbh Procédé pour la production d'une fonte d'acier
WO1994003294A1 (fr) * 1992-08-07 1994-02-17 Asea Brown Boveri Ab Procede et dispositif d'agitation d'un metal en fusion
EP0772015A1 (fr) * 1995-03-31 1997-05-07 Nippon Steel Corporation Procede et dispositif de prechauffage et de fusion de ferraille
DE19535014A1 (de) * 1995-09-21 1997-03-27 Stein Ind Anlagen Inh Christel Verfahren zum Einbringen von körnigen Feststoffen in Metallschmelzen

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118755972A (zh) * 2024-06-17 2024-10-11 广东红荔枝新材料科技有限公司 一种铝合金的熔炼工艺及其熔炼设备

Also Published As

Publication number Publication date
ATA104097A (de) 1998-10-15
AT405188B (de) 1999-06-25

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