EP0110809B1 - Verfahren und Vorrichtung zur Behandlung von Stahl in der Pfanne - Google Patents

Verfahren und Vorrichtung zur Behandlung von Stahl in der Pfanne Download PDF

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Publication number
EP0110809B1
EP0110809B1 EP83630190A EP83630190A EP0110809B1 EP 0110809 B1 EP0110809 B1 EP 0110809B1 EP 83630190 A EP83630190 A EP 83630190A EP 83630190 A EP83630190 A EP 83630190A EP 0110809 B1 EP0110809 B1 EP 0110809B1
Authority
EP
European Patent Office
Prior art keywords
tube
lance
ladle
slag
compartment
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.)
Expired
Application number
EP83630190A
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English (en)
French (fr)
Other versions
EP0110809A1 (de
Inventor
Paul Metz
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.)
Paul Wurth SA
Original Assignee
Arbed SA
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=19729981&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0110809(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Arbed SA filed Critical Arbed SA
Priority to AT83630190T priority Critical patent/ATE34585T1/de
Publication of EP0110809A1 publication Critical patent/EP0110809A1/de
Application granted granted Critical
Publication of EP0110809B1 publication Critical patent/EP0110809B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/005—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using exothermic reaction compositions
    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/064—Dephosphorising; Desulfurising
    • 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
    • C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents

Definitions

  • the present invention relates to a method for the metallurgical treatment of ladle steel, as well as to an installation for implementing this method.
  • Patent application DE-A-1 959 173 describes a treatment of ladle steel by means of slag obtained by combustion of metallic elements, such as AI, CaSi or non-metallic, such as CaO, AI 2 0 3 , Na Z C0 3 , NaN0 3 , using a mixture of AI powder with Na nitrate.
  • metallic elements such as AI, CaSi or non-metallic, such as CaO, AI 2 0 3 , Na Z C0 3 , NaN0 3
  • a mixture of AI powder with Na nitrate using a mixture of AI powder with Na nitrate.
  • the object of the invention is to create a method and an installation for carrying out desulfurization, deoxidation, purification and heating of the metal in a single operation.
  • Combustible materials such as metallic aluminum, calcium carbide, calcium-silicon, calcium-aluminum and possibly scorifying materials, such as lime or lime, are added to the liquid metal by means of a lance.
  • spath-fluorine carried by a neutral or reducing carrier gas, and oxygen is injected at the same point of impact, while adjusting the amounts of additions and oxygen so as to form the slag having the desired composition .
  • the process simultaneously leads to the formation of a very hot and particularly reactive slag and to a substantial increase in the temperature of the steel contained in the ladle, provided that the convection of the heat created through the bath is favored.
  • a neutral or reducing auxiliary gas injected either by one or more permeable elements housed in the bottom of the bag, substantially below the point of impact of the injection lance, or by an auxiliary lance also discharging substantially below this same point of impact.
  • Another characteristic of the process according to the invention consists in the simultaneous use of means with a view to avoiding immediate contact between the slag which covers the metal, with the slag formed during the process.
  • These means which will be described in more detail below, are essentially a dip tube which allows access to the metal in the pocket, while avoiding the presence in the working zone of the slag entrained during the transfer of the metal into the pocket .
  • the slag which covers the metal after pouring into a ladle is removed as far as possible.
  • the surface of the bath is covered with a protective layer which is preferably lime. Then a lid which is part of the installation according to the invention is lowered on the edges of the pocket and the treatment process is started, possibly after having protected the part of the surface of the bath which is free from the slag / lime mixture, by starting slag, as described above.
  • the installation according to the invention consists of a metallurgical ladle which is characterized in that it comprises means for delimiting a working zone in the bath, the said means cooperating with means for injecting into said zone solid and gaseous materials and that means are provided for introducing into the bath an upward flow of bubbling gas, directed onto said zone.
  • the means delimiting the working area essentially consist of a dip tube, known per se, which is provided tipping of a cap to allow penetration through the slag layer and the exposure of an area of the bath.
  • This dip tube can be either a single compartment tube or a tube subdivided into several compartments.
  • the means for injecting solid and gaseous materials are one or more vertical lances discharging from above, while the means intended for supplying the bubbling gas consist of permeable elements housed in the bottom of the bag and / or by a submerged lance.
  • Fig. 1 shows a section through an embodiment of the installation, using a single compartment dip tube.
  • Fig. 2 shows a section through a dip tube with two compartments.
  • a pocket 1 provided with a refractory layer not shown; in the bottom of the pocket is housed a permeable element 2 used to inject the inert bubbling gas or reducing agent G.
  • a single element 2 has been shown for reasons of convenience.
  • the cover 4 which covers the pocket to avoid heat loss and to prevent the entry of ambient air and which crimps the dip tube 5; the latter has at its base a cap 5e made of thin sheet metal, intended to pass through the layer of slag which swims over the steel 3 in the pocket to prevent these slag from entering the tube 5.
  • the tube 5 is provided with a cover 5c which has 5d gas exhausts. This cover crimps a lance 6 used for the introduction of solid and gaseous materials.
  • the tube 5 also has a coating of. interior and exterior protection (not shown).
  • a coating composed of materials which give off either under the action of high temperatures or by reaction with the metallic bath respectively the slag and / or with combustion oxygen, a gas capable of reducing respectively to eliminate the contact between container and content.
  • any material having the qualities described above can be used which, as a result of their decomposition, does not result in the introduction of undesirable materials into the metal bath. It is obviously advantageous to choose or include materials which partially decompose into compounds having a beneficial effect on the metallurgical treatment in progress.
  • Adequate protective coatings can be obtained by depositing calcium carbonate, magnesium, soda, etc. mixed with binders, which will be sprayed according to known methods on the surface of the metallurgical container or of the device which will be introduced into the liquid metal. These materials, in contact with the heat of the reactions of the metal bath or slag respectively, will release their CO 2 , while causing an endothermic reaction which counteracts the corrosive effect of the high temperatures generated by the reaction.
  • the protective coating may also consist of combustible materials such as wood, wood agglomerates and / or cardboard. It is not beyond the scope of the invention to form protective coatings by means of a mixture of combustible materials and carbonates by using p. ex. of agglomerated wood respectively of cartons added and / or impregnated with carbonates preferably basic.
  • Either a single lance can be used, which must therefore be a multiflux machine capable of delivering through separate channels solid and gaseous materials which may not be compatible and the contact of which before leaving the lance must be avoided. Indeed, one can easily imagine that it is necessary to prevent the metallic aluminum powder and the oxygen from coming into contact in the insufflation lance itself. To avoid the use of a complex lance, it is also possible to provide two lances, directed towards the same point of impact and one of which will be used to inject the combustible materials conveyed by inert gas and the other to provide the oxygen.
  • a single lance 6 multiflux supplied with oxygen by a pipe 11 and combustible materials by a pipe 7. These materials are stored in tanks 8 provided with cellular metering devices 9; line 7 is connected to a source of inert gas G which can be a neutral or reducing gas.
  • a lance 10 intended to supply bubbling gas G and which can replace the permeable element 2 or supplement it in the case where the flow rate of the permeable element or elements 2 turns out to be insufficient to distribute
  • the pocket 1 is provided with a tap hole system 20.
  • Fig. 2 shows a dip tube 50, the main feature of which is that it is subdivided into two compartments 5a and 5b.
  • the compartment 5a delimits the work area into which solids and oxygen are introduced via the lance 6.
  • As for the compartment 5b it communicates with the compartment 5a for the opening 30 which is formed in the partition between the two compartments.
  • the compartment 5a is provided at its base with a bottom 12 which has a small opening 12a, while the compartment 5b is open downwards.
  • a distinction is also made between the interior 51 and exterior 52 thermal protection coating.
  • the purpose of the embodiment shown in fig. 2 is to obtain as complete a combustion as possible of the materials injected into compartment 5a, the operation of heating and refining of the metal taking place essentially in compartment 5b, which contains only the slag heating and refining at very low deoxidizing content.
  • This double tube is used when one wants to manufacture steels with a very low content of deoxidizing materials.
  • the permeable elements 2 respectively the lance 10, supplying the bubbling gas G are located below the compartment 5b, in which the refining operation takes place as well as the heat transmission.
  • the slag formed in 5a overflows in part 5b where there is an intense bubbling between the metal and the hot slag.
  • the blown thermogenic element will be aluminum in the form of powder or granules, mixed with calcium carbide, also in powder or granules, in a proportion of 1.6 kg of CaC 2 to 0.74 kg of Al, as well as possibly 3 to 10% of CaF2 intended to improve the fluidity of the slag.
  • the temperature of the metal bath is increased by 18 °.
  • 3.3 kg of mixture must be injected per tonne of steel, i.e. 400 kg of AI CaC 2 mixture, without taking into account the 20 kg of calcium fluoride intended for adjust the viscosity of the slag.
  • the 400 kg are injected in 20 minutes, which corresponds to a temperature increase of 3 ° C per minute.
  • an intense current of argon is injected by the permeable element 2 and / or by the lance 10. The injection of argon is continued for 5 minutes after the injection. After this operation, the target temperature of 1,670 ° C was reached and the metal contained no more than 0.004% sulfur, while having excellent micrographic purity.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Claims (6)

1. Verfahren zur Behandlung von Stahl in der Pfanne mittels reaktiven Schlacken von an sich grundsätzlich bekannter Zusammensetzung, welches die Bildung der genannten Schlacken in einem, in den in der Pfanne enthaltenen Stahl eingetauchtem Rohr mit Hilfe von metallothermischen Reaktionen vorsieht, wobei mit Hilfe einer Lanze Sauerstoff in das Rohr eingeblasen wird, brennbare metallische Stoffe, welche mit dem Sauerstoff unter Bildung der genannten Schlacken reagieren, in das Rohr eingeführt werden und unterhalb des Rohres, in welchem die Stahlbehandlung stattfindet, ein neutrales oder reduzierendes Spülgas eingeblasen wird.
2. Verfahren gemäss Anspruch 1, dadurch gekennzeichnet, dass die brennbaren Stoffe in einem neutralen oder reduzierenden Trägergas in Schwebe gebracht und mittels einer Lanze in das Rohr eingeblasen werden.
3. Verfahren gemäss einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass vor Beginn der Zugabe von festen oder gasförmigen Stoffen an der Auftreffstelle des Sauerstoffs ein Polster aus Ausgangsschlacke, wie zum Beispiel vorgefertigte Schlacke. Kalk oder ein selbstschmelzendes Gemisch aufgebracht wird.
4. Vorrichtung zur Behandlung von Stahl in der Pfanne mittels reaktiven Schlacken von an sich grundsätzlich bekannter Zusammensetzung, wobei diese Behandlung die Bildung der genannten Schlacken in einem, in den in der Pfanne enthaltenen Stahl eingetauchtem Rohr mit Hilfe von metallothermischen Reaktionen vorsieht, bei welcher Vorrichtung die metallurgische Pfanne (1) mit einem in einem Deckel (4) eingefassten Tauchrohr (50) versehen ist, welches Tauchrohr unterteilt ist in eine erste Kammer (5a) in die eine Lanze (6) einmündet und in eine zweite Kammer (5b) die mit der ersten Kammer (5a) durch eine Oeffnung (30) in der Trennwand zwischen den beiden Kammern in Verbindung steht, die zweite Kammer (5b) nach unten offen ist, Mittel (2, 10) zur Zuführung eines neutralen oder reduzierenden aufsteigenden Spülgasstromes unterhalb der zweiten Kammer (5b) vorgesehen sind und die Lanze (6), welche über eine erste Leitung (11) mit Sauerstoff und über eine zweite Leitung (7) mit Feststoffen beaufschlagt wird, in den das Täuchrohr (50) abdeckenden Deckel (5c) eingefasst ist.
5. Vorrichtung gemäss Anspruch 4, dadurch gekennzeichnet, dass die zur Zuführung von Spülgasen vorgesehenen Mittel aus im Pfannenboden angebrachten gasdurchlässigen Körpern (2) oder aus einer Tauchlanze (10) bestehen.
6. Vorrichtung gemäss Anspruch 4, dadurch gekennzeichnet, dass das Rohr (50) wenigstens teilweise mit Stoffen beschichtet ist, welche im Kontakt mit schmelzflüssigen Schlacken oder Metallen Gase freisetzen.
EP83630190A 1982-11-17 1983-11-16 Verfahren und Vorrichtung zur Behandlung von Stahl in der Pfanne Expired EP0110809B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83630190T ATE34585T1 (de) 1982-11-17 1983-11-16 Verfahren und vorrichtung zur behandlung von stahl in der pfanne.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU84472A LU84472A1 (fr) 1982-11-17 1982-11-17 Procede et installation pour le traitement de l'acier en poche
LU84472 1982-11-17

Publications (2)

Publication Number Publication Date
EP0110809A1 EP0110809A1 (de) 1984-06-13
EP0110809B1 true EP0110809B1 (de) 1988-05-25

Family

ID=19729981

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83630190A Expired EP0110809B1 (de) 1982-11-17 1983-11-16 Verfahren und Vorrichtung zur Behandlung von Stahl in der Pfanne

Country Status (8)

Country Link
US (1) US4518422B1 (de)
EP (1) EP0110809B1 (de)
JP (1) JPS59133314A (de)
AT (1) ATE34585T1 (de)
AU (1) AU554336B2 (de)
CA (1) CA1213147A (de)
DE (1) DE3376752D1 (de)
LU (1) LU84472A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1665942B (zh) * 2002-05-24 2011-05-11 保尔·沃特公司 对金属浴的冶金处理方法

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3427087C1 (de) * 1984-07-19 1986-04-10 Mannesmann AG, 4000 Düsseldorf Metallurgisches Gefaess
LU86552A1 (de) * 1986-08-11 1988-03-02 Arbed Verfahren und mittel zum gleichzeitigen aufheizen und reinigen von metallbaedern
US4761178A (en) * 1987-08-24 1988-08-02 Bethlehem Steel Corporation Process for heating molten steel contained in a ladle
IN172394B (de) * 1988-07-22 1993-07-17 Boest Alpine Stahl Donawitz Ge
BE1004483A3 (fr) * 1990-06-29 1992-12-01 Cockerill Sambre Sa Procede de rechauffage d'un bain d'acier liquide.
US5188661A (en) * 1991-11-12 1993-02-23 Cook Donald R Dual port lance and method
GB2285061B (en) * 1993-12-21 1997-01-08 Vacmetal Gmbh A method of processing ferrous materials
LU90005B1 (fr) * 1997-01-15 1998-07-16 Wurth Paul Sa Procédé et installation pour le traitement de l'acer en poche
GB2351297B (en) * 1999-06-21 2004-01-21 Vacmetal Gmbh Metallurgical treatment apparatus
FR2809336B1 (fr) * 2000-05-26 2002-11-08 Jean Albert Francois Sunnen Procede de reduction selective de dechets industriels et menagers
EP1428894A1 (de) * 2002-12-13 2004-06-16 SMS Mevac GmbH Entgasungsverfahren von Flüssigstahl
JP4345769B2 (ja) * 2006-04-07 2009-10-14 住友金属工業株式会社 極低硫高清浄鋼の溶製方法
CN104588631B (zh) * 2015-01-19 2018-12-11 新疆八一钢铁股份有限公司 应用钢渣余热烘烤新修砌铁水包的方法

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GB1436452A (en) * 1973-06-07 1976-05-19 Kobe Steel Ltd Method of and apparatus for agitating a bath of molten metal
DE2333937C2 (de) * 1973-07-04 1975-07-17 Fried. Krupp Huettenwerke Ag, 4630 Bochum Verfahren zur Herstellung hochchromhaltiger Stähle mit niedrigstem Kohlenstoffgehalt
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1665942B (zh) * 2002-05-24 2011-05-11 保尔·沃特公司 对金属浴的冶金处理方法

Also Published As

Publication number Publication date
JPH0361724B2 (de) 1991-09-20
US4518422B1 (en) 1999-06-08
US4518422A (en) 1985-05-21
DE3376752D1 (en) 1988-06-30
CA1213147A (fr) 1986-10-28
AU554336B2 (en) 1986-08-14
AU2141683A (en) 1984-05-24
EP0110809A1 (de) 1984-06-13
LU84472A1 (fr) 1984-06-13
ATE34585T1 (de) 1988-06-15
JPS59133314A (ja) 1984-07-31

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