EP0070913B1 - Récipient pour le traitement de métaux en fusion - Google Patents

Récipient pour le traitement de métaux en fusion Download PDF

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Publication number
EP0070913B1
EP0070913B1 EP81105911A EP81105911A EP0070913B1 EP 0070913 B1 EP0070913 B1 EP 0070913B1 EP 81105911 A EP81105911 A EP 81105911A EP 81105911 A EP81105911 A EP 81105911A EP 0070913 B1 EP0070913 B1 EP 0070913B1
Authority
EP
European Patent Office
Prior art keywords
vessel
molten metal
supply pipe
diameter
pipe
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
EP81105911A
Other languages
German (de)
English (en)
Other versions
EP0070913A1 (fr
Inventor
Richard A. Dr.-Ing. Weber
Carl-Heinz Dipl.-Ing. Schütz
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.)
Thyssen AG
Original Assignee
Thyssen AG
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 Thyssen AG filed Critical Thyssen AG
Priority to DE8181105911T priority Critical patent/DE3174127D1/de
Priority to EP81105911A priority patent/EP0070913B1/fr
Priority to US06/401,207 priority patent/US4437652A/en
Priority to JP57129726A priority patent/JPS5867833A/ja
Publication of EP0070913A1 publication Critical patent/EP0070913A1/fr
Application granted granted Critical
Publication of EP0070913B1 publication Critical patent/EP0070913B1/fr
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
    • C21C7/10—Handling in a vacuum
    • 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
    • C22B9/04—Refining by applying a vacuum

Definitions

  • the invention relates to a vessel for the continuous treatment of molten metals under negative pressure by the circulation process, in particular for degassing steel melts according to the preamble of claim 1.
  • Vessels such as those e.g. are known from LU-A-36943, are used for the degassing of liquid steel according to the so-called circulation process.
  • the liquid steel located in a pan placed below the vessel is lifted into the vessel by introducing conveying gas into the inlet pipe and using a negative pressure in the vessel and flows back into the pan in a constant stream through the outlet pipe of the vessel.
  • the treatment time of the steel in this process is given by the circulation rate of the steel, which in turn depends on the vessel diameter and the cross sections of the inlet and outlet pipes (DE-A-14 58 874).
  • the steelworker strives to keep the treatment time of the steel as short as possible.
  • the object of the present invention is to provide a vessel for the treatment of liquid metal of the type mentioned at the beginning, with which a significantly higher circulation rate of the liquid metal can be achieved with a small space requirement compared to conventional vessels.
  • the vessel bottom is enlarged in the direction of the line (seen in cross-section) connecting the axes of the inlet pipe and the outlet pipe in the inventive vessel design the transverse axis to this, so that with a larger cross-section of the inlet pipe and outlet pipe for an increased throughput, the required distance of the pipes from one another and from the vessel walls can be maintained and therefore there is no risk of increased erosion of the refractory material.
  • the vessel Since the vessel is enlarged in one axis only in the lower region, the overall space requirement of the vessel has changed insignificantly. In particular, the height of the vessel can remain unchanged, which is particularly important with regard to the manipulations of the vessel required during the repair of the ff material.
  • the surface of the vessel according to the invention is considerably smaller than the surface of a vessel of conventional construction with which an equally large circulation rate can be achieved. For this reason, there are savings in the refractory material of the lining and also in the heating output to be used for heating the vessel.
  • the non-circular geometry of the bottom of the vessel can be realized in various ways, for example by an elliptical shape or a cigar-shaped shape, with an oval shape being preferred.
  • a vessel lower part flattened at least on one side offers sufficient free space for the addition of additives into the ladle in the case of a steelworks pan with a circular cross section arranged under the vessel.
  • the lower part of the vessel is formed according to one embodiment of the invention in such a way that its cross-sectional area increases continuously in the direction of the bottom of the vessel, that is to say it is bell-shaped.
  • the lining of the vessel wall can be carried out easily.
  • a gradual expansion of the cross section of the lower part of the vessel is possible.
  • the vessel shown in the drawings consists of a rotationally symmetrical upper vessel part 1 and a lower vessel part 2 flanged to it.
  • the upper vessel part 1 is closed to the atmosphere by a lid 3.
  • Additives, for example alloying agents, can be introduced via a shaft 4, which opens obliquely into the upper part 1 of the vessel and in which a lock is provided for closing off to the outside.
  • the vessel 1, 2 can be placed under negative pressure by means of a suction device 5 connected to the upper part 1 of the vessel.
  • an inlet pipe 7 and an outlet pipe 8 are arranged spatially separated from one another, which dip into the molten metal of a pan 9 arranged under the vessel 1, 2.
  • Gas, for example argon, nitrogen or carbon monoxide, is introduced via a line 10 opening into the inlet pipe 7.
  • the gas rising as bubbles in the inlet pipe 7 has the effect of reducing the specific weight of the volume composed of molten metal and gas in the inlet pipe 7. Since the gas bubbles separate in the molten metal in the vessel 1, 2, the molten metal in the outlet pipe 8 no longer contains the specific weight-reducing gas bubbles, so that due to the different weights in the two pipes 7, 8, in conjunction with the negative pressure in the vessel 1, 2, the molten metal is pumped over the vessel 1, 2 and treated, in particular degassed.
  • the vessel bottom is enlarged in the direction of the straight line running through both axes of the inlet pipe 7 and outlet pipe 8, so that with larger cross sections of the inlet and outlet pipes 7, 8 and greater, mutual distance from the walls , there is enough free space to at least reduce the risk of erosion from the surrounding metal.
  • the bottom 6 of the vessel 1, 2 has an elliptical shape. This elliptical shape leaves enough space on both sides of the connecting line of the two tubes in a circular pan 9 in order to be able to add additives into the melt.
  • the vessel base 6 is flattened on both sides with respect to a circular one. It is sufficient if the flattening is only provided on one side for the addition of additives.
  • the side walls merge obliquely into the upper part of the vessel in the region of the longitudinal axis of the elliptical base 6, while the walls run perpendicularly in the region of the elliptical axis lying transversely thereto.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Claims (2)

1. - Récipient pour le traitement en continu de matériaux fusés sous dépression selon le procédé par circulation, en particulier pour le dégazage d'acier fondu, dont le fond comporte une tubulure d'entrée plongeant dans le métal fusé avec une tubulure de gaz débouchant dedans, ainsi qu'une tubulure de sortie qui est disposée separée spatialement et plongeant dans le métal fusé pour le métal fusé traité, la partie inférieure du récipient différant par la forme de la partie supérieure symétrique de revolution en s'élargissant vers le fond du récipient en forme de cloche, caractérisé par le fait que le diamètre (D) croisant les axes des tubulures d'entrée (7) et de sortie (8) est plus grand que le diamètre (d) du fond (6) du récipient qui lui est orthogonal, s'étendant entre les tubulures d'entrée (7) ct de sortie (8), qui est sensiblement égal au diamètre correspondant de la partie supérieure (1) du récipient.
2. - Récipient selon la revendication 1, caractérisé par le fait que le fond (6) du récipient a uneforme sensiblement elliptique.
EP81105911A 1981-07-27 1981-07-27 Récipient pour le traitement de métaux en fusion Expired EP0070913B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DE8181105911T DE3174127D1 (en) 1981-07-27 1981-07-27 Vessel for the treatment of molten metal baths
EP81105911A EP0070913B1 (fr) 1981-07-27 1981-07-27 Récipient pour le traitement de métaux en fusion
US06/401,207 US4437652A (en) 1981-07-27 1982-07-23 Vessel for the treatment of molten metal
JP57129726A JPS5867833A (ja) 1981-07-27 1982-07-27 溶融金属の処理容器

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP81105911A EP0070913B1 (fr) 1981-07-27 1981-07-27 Récipient pour le traitement de métaux en fusion

Publications (2)

Publication Number Publication Date
EP0070913A1 EP0070913A1 (fr) 1983-02-09
EP0070913B1 true EP0070913B1 (fr) 1986-03-19

Family

ID=8187836

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81105911A Expired EP0070913B1 (fr) 1981-07-27 1981-07-27 Récipient pour le traitement de métaux en fusion

Country Status (4)

Country Link
US (1) US4437652A (fr)
EP (1) EP0070913B1 (fr)
JP (1) JPS5867833A (fr)
DE (1) DE3174127D1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4130590C2 (de) * 1991-09-12 1993-11-04 Mannesmann Ag Entgasungsgefaess fuer die vakuumbehandlung von fluessigem stahl
US5520718A (en) * 1994-09-02 1996-05-28 Inland Steel Company Steelmaking degassing method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU36598A1 (fr) *
LU36943A1 (fr) * 1958-03-10
US3022059A (en) * 1958-03-10 1962-02-20 Hoerder Huettenunion Ag Apparatus for treating metal melts
DE1458874A1 (de) * 1959-05-13 1970-03-19 Rheinstahl Huettenwerke Ag Vakuumentgasung von geschmolzenen Metallen,insbesondere Stahl
US3547622A (en) * 1968-06-12 1970-12-15 Pennwalt Corp D.c. powered plasma arc method and apparatus for refining molten metal

Also Published As

Publication number Publication date
US4437652A (en) 1984-03-20
DE3174127D1 (en) 1986-04-24
EP0070913A1 (fr) 1983-02-09
JPS5867833A (ja) 1983-04-22

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