EP0000466A1 - Procédé d'introduction de matières granuleuses, dans un bain de métal fondu et dispositif pour la mise en oeuvre du procédé - Google Patents

Procédé d'introduction de matières granuleuses, dans un bain de métal fondu et dispositif pour la mise en oeuvre du procédé Download PDF

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Publication number
EP0000466A1
EP0000466A1 EP78100014A EP78100014A EP0000466A1 EP 0000466 A1 EP0000466 A1 EP 0000466A1 EP 78100014 A EP78100014 A EP 78100014A EP 78100014 A EP78100014 A EP 78100014A EP 0000466 A1 EP0000466 A1 EP 0000466A1
Authority
EP
European Patent Office
Prior art keywords
pan
melt
molten metal
chamber
tube
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.)
Withdrawn
Application number
EP78100014A
Other languages
German (de)
English (en)
Inventor
Johann Hartl
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.)
Voestalpine AG
Original Assignee
Voestalpine 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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0000466A1 publication Critical patent/EP0000466A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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
    • C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
    • 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

Definitions

  • the invention relates to a method for introducing granular substances into a molten metal, in particular for introducing a desulfurizing agent into a molten steel.
  • blow-in depth should be at least 2 meters to ensure an even distribution of the substances in the melt, which means that diving lances with a length of 4 to 5 meters are required.
  • the invention aims to avoid these disadvantages and difficulties and has as its object to provide a method for introducing granular substances into a molten metal, in particular for introducing a desulfurizing agent into a molten steel, and an apparatus for carrying out this method, which enable the granular materials directly into the molten steel, without being able to introduce a carrier gas and with a minimal burn-off of the granular materials being guaranteed.
  • the method according to the invention should be applicable for metallurgical pans of different sizes, in particular also for small pans.
  • these objects are achieved in that the liquid level of two refractory-lined vessels which are in a liquid-conducting connection with one another is changed periodically, the metal melt alternatingly flowing from one vessel into the other vessel with vortex formation and the granular substances being thrown onto the flowing metal in the rising phase become.
  • the liquid level of the communicating vessels is advantageously changed by periodically loading one of the vessels with an inert gas, preferably nitrogen, or vacuum.
  • the part of the melt flowing into the vessel in which the granular substances are added expediently makes up 3 to 15% of the total volume of the melt to be treated, as a result of which the number of periodically successive changes in liquid level can be kept low.
  • a device for performing the invention is characterized in that a chamber which is in fluid communication with the pan via a vortex-forming narrowing of its cross section is provided, which is connected at its upper end to a metering device of the storage container and to a gas supply line.
  • the chamber is designed as a tube projecting vertically from above into the pan with a cylindrical part, at the lower end of which a conical taper is provided with a flow opening located at a distance above the pan bottom.
  • a melt level sensor is arranged in the region of the transition of the cylindrical tube part into the conical section, which is connected via a control line to the metering device of the storage container and to a control valve for the gas supply line and preferably to a vent valve of a vent line of the tube.
  • the chamber in the cylindrical part expediently has an inner cross section which corresponds to at least three times the inner cross section of the chamber at its narrowest point of the conical section and the conical section has a length which is greater than 0.4 F 1 , in which F 1 means the cross-sectional area of the cylindrical tube part, which ensures a sufficient eddy formation of the molten steel in the chamber.
  • F 1 means the cross-sectional area of the cylindrical tube part, which ensures a sufficient eddy formation of the molten steel in the chamber.
  • the length of the interior of the chamber is greater than the distance between its flow opening and the bottom of the pan, preferably greater than 1 m.
  • the invention is based on an embodiment a device according to the invention, which is shown in section in the drawing, explained in more detail.
  • pan 1 with a pan provided with a refractory lining 2 for receiving a molten steel 3 is designated.
  • the pan 1 is covered with a lid 4.
  • the lid has an opening 5, into which a tube 6, which is lined on the inside and outside with refractory material 7, is inserted.
  • the tube 6 is cylindrical over most of its length and has a conical, funnel-like taper 8 at its lower end, as a result of which the internal cross section of the tube from the cross-sectional area F 1 of the cylindrical part to the cross-sectional area F 2 of the flow opening 9 on the conical part 8 is reduced.
  • F 2 is approximately 1: 4, the cross-sectional area F 21 being between approximately 150 and 750 cm 2 in order to enable unimpeded and trouble-free flow of the molten steel.
  • the flow opening 9 is at a certain distance 10 above the bottom 11 of the pan, which is preferably a maximum of 100 cm.
  • the pipe 6 is connected via a down pipe 12 to a storage container 13 for the granular material 14 to be added to the molten steel - a desulfurizing agent in the exemplary embodiment described.
  • the downpipe 12 can be closed by a flap 15.
  • a metering device 16 such as a cellular wheel, is provided above the flap 15.
  • a vent line 17 opens laterally into the downpipe 12 and can also be closed by means of a flap 18.
  • This flap 18 is one Safety flap that is held in the closed position by spring force or by a weight.
  • a gas feed line 19 and a vent line 20 open at the upper end of the cylindrical tube, both of which can be shut off by a valve 21, 22.
  • the gas supply line is fed from a pressure vessel 23 with inert gas, preferably nitrogen.
  • the flap 15 which controls the inflow of the desulfurization agent and the metering device 16 and the valves 21, 22 on the vent line 20 and on the gas supply line 19 can be controlled by a relay 24, which receives control pulses from a melt level sensor 25, which is inside the tube 6 at the transition is arranged in the conical part 8.
  • the melted steel melt is replaced by the conical Part 8 of the tube 6 is set in turbulence, whereby the desulfurizing agent is mixed well with the molten steel.
  • the length 27 of the conical part 8 of the tube 6 is greater than 0.4 F 1 and the immersion depth of the tube, ie the distance from the level 26 to the flow opening 9 is greater than 100 cm.
  • the volume of the melt flowing into the tube 6, i.e. the volume of the interior of the tube 6 between the level 26 and the melt level sensor 25 should make up 3 to 15% of the total volume of the melt to be treated, as a result of which both the dimensions of the tube 6 and the number of treatment processes can be kept relatively small.
  • the metering device 16 is adjusted so that the steel flowing into the tube 6 receives an excess of desulfurizing agent which is released to the pan when the molten steel flows out of the tube while being mixed with the melt in the pan.
  • the process described is repeated several times. The number of repetitions of this process depends on the contents of the pan, the volume of the cylindrical tube and the chemical composition of the starting melt and the desired chemical composition of the end product.
  • This device can advantageously be used for steel quantities in the range of approximately 17 to 34 t.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
EP78100014A 1977-07-13 1978-06-01 Procédé d'introduction de matières granuleuses, dans un bain de métal fondu et dispositif pour la mise en oeuvre du procédé Withdrawn EP0000466A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT5028/77 1977-07-13
AT502877 1977-07-13

Publications (1)

Publication Number Publication Date
EP0000466A1 true EP0000466A1 (fr) 1979-02-07

Family

ID=3571126

Family Applications (1)

Application Number Title Priority Date Filing Date
EP78100014A Withdrawn EP0000466A1 (fr) 1977-07-13 1978-06-01 Procédé d'introduction de matières granuleuses, dans un bain de métal fondu et dispositif pour la mise en oeuvre du procédé

Country Status (2)

Country Link
EP (1) EP0000466A1 (fr)
JP (1) JPS5419411A (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099435A1 (fr) * 1982-07-20 1984-02-01 Kawasaki Steel Corporation Procédé pour le brassage d'un métal fondu et cylindre réfractaire pour cet usage
EP0099436A1 (fr) * 1982-07-20 1984-02-01 Kawasaki Steel Corporation Procédé d'affinage d'un métal liquide par brassage au moyen de succion et refoulement alterués
EP0110809A1 (fr) * 1982-11-17 1984-06-13 Arbed S.A. Procédé et installation pour le traitement de l'acier en poche
EP0835943A1 (fr) * 1996-10-09 1998-04-15 Foseco GmbH Cloche inférieure pour le procédé CAS-OB

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU44592A1 (fr) * 1962-11-29 1963-12-09
FR2124426A1 (fr) * 1971-02-04 1972-09-22 Arbed
FR2175001A1 (fr) * 1972-03-08 1973-10-19 Arbed

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU44592A1 (fr) * 1962-11-29 1963-12-09
FR2124426A1 (fr) * 1971-02-04 1972-09-22 Arbed
FR2175001A1 (fr) * 1972-03-08 1973-10-19 Arbed

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0099435A1 (fr) * 1982-07-20 1984-02-01 Kawasaki Steel Corporation Procédé pour le brassage d'un métal fondu et cylindre réfractaire pour cet usage
EP0099436A1 (fr) * 1982-07-20 1984-02-01 Kawasaki Steel Corporation Procédé d'affinage d'un métal liquide par brassage au moyen de succion et refoulement alterués
EP0110809A1 (fr) * 1982-11-17 1984-06-13 Arbed S.A. Procédé et installation pour le traitement de l'acier en poche
EP0835943A1 (fr) * 1996-10-09 1998-04-15 Foseco GmbH Cloche inférieure pour le procédé CAS-OB

Also Published As

Publication number Publication date
JPS5419411A (en) 1979-02-14

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: HARTL, JOHANN