WO1999040229A1 - Procede pour charger un four electrique avec un corps creux rempli de materiau pulverulent - Google Patents

Procede pour charger un four electrique avec un corps creux rempli de materiau pulverulent Download PDF

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Publication number
WO1999040229A1
WO1999040229A1 PCT/EP1999/000113 EP9900113W WO9940229A1 WO 1999040229 A1 WO1999040229 A1 WO 1999040229A1 EP 9900113 W EP9900113 W EP 9900113W WO 9940229 A1 WO9940229 A1 WO 9940229A1
Authority
WO
WIPO (PCT)
Prior art keywords
hollow body
furnace
powdery material
carrier tape
hot
Prior art date
Application number
PCT/EP1999/000113
Other languages
German (de)
English (en)
Inventor
Marc Solvi
Norbert Kaell
Original Assignee
Paul Wurth S.A.
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 Paul Wurth S.A. filed Critical Paul Wurth S.A.
Priority to EP99904763A priority Critical patent/EP1051525A1/fr
Priority to AU25169/99A priority patent/AU2516999A/en
Priority to BR9907246-7A priority patent/BR9907246A/pt
Publication of WO1999040229A1 publication Critical patent/WO1999040229A1/fr

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0086—Conditioning, transformation of reduced iron ores
    • 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
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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 present invention relates to a method for charging an electric furnace with powdery material.
  • Electric furnaces for melting metals are available as direct current furnaces, e.g. from DE-A-40 25 084, and as AC furnaces, e.g. from EP-A-0 291 680 or from EP-A-0 373 378. They generally consist of an oven vessel, the so-called sub-oven, and an oven cover, which can be removed for charging the oven and which is placed on the sub-oven again after the oven has been loaded.
  • the furnace lid is mostly made of metal with an integrated water cooling. In the middle of the furnace lid there is an insert made of heat-resistant, electrically insulating material. The electrodes are inserted into the furnace through one or more openings in the insert.
  • Electric furnaces are mostly charged with scrap metal, liquid metal and / or with directly reduced iron, whereby the lid of the furnace is usually removed and the material to be melted is introduced into the furnace, the lid is brought back into position and electrodes are then introduced into the furnace and melt the material.
  • Different versions allow the electric furnace to be filled with solid or liquid materials even during operation.
  • some of the material in the slag is deposited on the surface of the metal bath 2 floats, retained and discharged from the melting furnace with the slag.
  • An alternative method is to introduce the powdered material into the bath at high speed using a lance.
  • the powdery material is suspended in a gas stream and applied to the surface of the metal bath together with relatively large amounts of gas. Due to the high speed of the gas and the particles of the powdery material floating in it, the powdery material penetrates deep into the liquid phase and quickly dissolves in it.
  • This method is mainly suitable for the production of relatively small amounts of powdery material such as e.g. Add additives to a liquid metal bath. If large quantities of powdered material are to be introduced into the furnace, this process becomes quite expensive because of the high quantities of neutral gas. Due to the large amounts of gas that hit the surface of the metal bath, the melt cools down quickly.
  • This method is not very suitable for placing large quantities of hot, powdery material in an oven.
  • the material can clump under certain circumstances and thus lead to blockages.
  • the common method that allows larger quantities of powdered material to be introduced into a melting furnace is to first form the powdery material into pellets or briquettes and then to introduce the pellets or briquettes into the melting furnace.
  • the production of pellets or briquettes is complex and there is a loss of powdery material because a certain amount of pellets or briquettes disintegrate before they can be introduced into the melting furnace.
  • a disadvantage of all previously known methods is that no hot material can be introduced into a melting furnace.
  • the object of the present invention is therefore to propose a method which allows large amounts of hot, powdery material to be introduced into a melting furnace.
  • This object is achieved according to the invention by a method for charging a melting furnace with powdery material, hot, powdery material being applied to a carrier tape, the carrier tape being shaped into a hollow body and, together with the hot, powdery material contained therein, in a melting furnace is introduced and melted down.
  • An important advantage of the present invention is that larger quantities of powdered material can be introduced into a melting furnace without difficulty, without the disadvantages mentioned.
  • the powdery material is protected against the aggressive atmosphere that prevails in the melting furnace by its covering made of carrier tape. Excessive oxidation of the powdery material is prevented by the cover made of carrier tape. It also prevents powdery material from being discharged from the furnace with the exhaust gases.
  • a method for producing and smelting directly reduced iron wherein iron ore is brought into contact with a reducing agent and heated, so that directly reduced iron forms, the hot, directly reduced iron is applied to a carrier tape is, the carrier tape is deformed into a hollow body and, together with the hot, directly reduced iron contained therein, is introduced into a melting furnace and melted down.
  • This process is particularly suitable for introducing directly reduced iron in powder form into an electric furnace.
  • the directly reduced iron is applied to a carrier tape shortly after its production, when it is still hot, and is shaped into a hollow body and introduced into the electric furnace.
  • hot powdered, directly reduced iron can be melted in an electric furnace immediately after its production without great loss of material or heat. You can either use the directly reduced iron together with any residues of the reducing agent or you can first separate the directly reduced iron from these residues and then introduce it into the electric furnace. 4
  • Additives such as reducing agents - petroleum and petroleum derivatives, solid carbon carriers such as e.g. Lignite coke, petroleum coke, blast furnace dust, coal, etc., additives, alloys such as manganese or ferrosilicon, slag formations e.g. Lime, dolomite, fluorspar, etc. are added to the directly reduced iron before it is processed into a coated strand and introduced into the electric furnace. As a result, these additives no longer have to be introduced into the furnace using a lance at a later point in time.
  • the powdery material after it has been applied to the carrier tape, is compressed. This can be done either by means of a special device before the carrier tape is formed into a hollow body or during the shaping of the carrier tape.
  • the cross section of the hollow body can also be reduced retrospectively, thereby further compressing the powdery material.
  • Paint can either be applied to the flat carrier tape or to the finished hollow body.
  • This coating can be created, for example, by spraying the hot hollow body with lime water, the water evaporating and cooling the hollow body on its surface and leaving a thin layer of lime on the surface.
  • the strand can additionally be protected from the heat in the furnace by a water-cooled device which projects into the furnace and through which the hollow body is introduced into the furnace.
  • the carrier tape is normally made of sheet metal if reduced iron is to be melted down directly, the wall thickness essentially depending on the thickness, the winding speed and the weight per running meter of the strand.
  • FIG. 1 a section through an electric furnace and a system for charging powdered material
  • FIG. 2 a section along the line AA of FIG. 1
  • FIG. 3 a section along the line BB of FIG. 1
  • .4 a section through a preferred embodiment of an electric furnace and through a system for charging powdered material
  • Then 1 shows an electric furnace 10 for melting metals.
  • Electric furnace 10 consists of a furnace vessel, the so-called sub-furnace 12, and an furnace cover 14, which can be removed for charging the furnace and which is placed on the sub-furnace 12 again after the furnace has been loaded.
  • the furnace cover 14 is usually made of metal with an integrated water cooling 16.
  • In the middle of the furnace cover there is an insert made of heat-resistant, electrically insulating material.
  • the electrodes 18 are introduced into the furnace through one or more openings in the insert. 6
  • Electric furnaces are mostly charged with scrap metal, liquid metal and / or with directly reduced iron, whereby the lid of the furnace is usually removed and the material to be melted is introduced into the furnace, the lid is brought back into position and electrodes are then introduced into the furnace and melt the material.
  • a system for charging powdered material is attached.
  • This system understands a hopper 20 with powdery material 22, a weighing device 24, and a rotary valve 26 or other metering device such as e.g. a snail.
  • the powdery material 22 is dosed from the storage hopper 20 via the cellular wheel sluice 26 and poured onto a carrier belt 28 (see FIG. 2).
  • the carrier tape 28 is unwound from a supply roll 30 and passed under the rotary valve 26 and loaded with hot, powdery material. Before the carrier tape 28 is loaded with powdery material 22, it is deformed into a V-shaped or U-shaped cross section with the aid of various rollers 32, so that the powdery material remains better on the tape 28.
  • the powdery material After the powdery material has been applied to the belt 28, it is compacted and the belt 28 is deformed by means of rollers 34 into a hollow body 36 (see also FIG. 3).
  • the tubular hollow body 36 filled with powdery material is then introduced into the electric furnace 10.
  • the hollow body 36 is brought with the aid of guide rollers 37 through a cooling device 38, where the surface of the hollow body 36 is sprinkled with water or lime water and cooled to the extent that it is ensured that the hollow body 36 only after it has entered the liquid metal 39 in
  • Hollow body 36 is inserted into the liquid metal 39, a porous stone 40 is attached, through which a neutral or reducing gas 42 into the furnace 10th 7
  • a protective device 44 is installed in the cover 14, through which the hollow body is guided into the interior of the electric furnace. This device protects the hollow body from the radiant heat in the furnace, so that it is ensured that the hollow body does not melt before entering the metal bath.
  • the carrier tape 28 consists of sheet metal and is actually only a lost formwork for the powdery material 22. It guarantees that the powdery material is introduced directly into the bath of liquid metal 39 without part of it being discharged from the furnace 10 with the exhaust gases is or without a portion of the powdery material is trapped in the slag that floats over the liquid metal and is discharged with it from the furnace.
  • the "wrapping" of the powdered material in a carrier tape prevents the directly reduced iron from oxidizing when it gets inside the electric furnace.
  • This electric furnace 46 consists of a furnace vessel, the so-called sub-furnace 48, and an furnace cover 50, which can be removed for charging the furnace and which is placed on the sub-furnace 48 again after the furnace has been loaded.
  • the furnace cover 50 is mostly made of metal with an integrated water cooling 52.
  • In the middle of the furnace cover there is an insert made of heat-resistant, electrically insulating material.
  • the electrodes 54 are inserted into the furnace 46 through one or more openings in the insert.
  • the hollow body 36 is guided between the electrodes 54 through a water-cooled protective device 56 in the middle of the furnace cover 50 into the interior of the furnace.
  • the hollow body penetrates a layer of slag 58, which is on the surface of the liquid metal bath 60 8th
  • the hollow body 36 is guided between the electrodes 54 to the hottest point in the metal bath.
  • This furnace additionally has a gate 62 in a side wall of the furnace cover 50 through which the slag can be removed.
  • the liquid metal is discharged through a side extension 64 of the lower furnace through a tap hole 66 and filled into a pan 68.
  • a removable plug 70 closes the tap hole 68.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)

Abstract

L'invention concerne un procédé pour charger un four de fusion avec un matériau pulvérulent. Selon ce procédé, le matériau pulvérulent chaud est déposé sur une bande support, qui est ensuite façonnée pour donner un corps creux, puis est introduite et fondue dans un four de fusion avec le matériau pulvérulent chaud contenu dans ladite bande support.
PCT/EP1999/000113 1998-02-04 1999-01-11 Procede pour charger un four electrique avec un corps creux rempli de materiau pulverulent WO1999040229A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP99904763A EP1051525A1 (fr) 1998-02-04 1999-01-11 Procede pour charger un four electrique avec un corps creux rempli de materiau pulverulent
AU25169/99A AU2516999A (en) 1998-02-04 1999-01-11 Method for loading an electric oven with a powder material in the form of a filled hollow body
BR9907246-7A BR9907246A (pt) 1998-02-04 1999-01-11 Processo para alimentar um forno elétrico com material pulverizado, na forma de um corpo de alimentação cÈncavo

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
LU90210 1998-02-04
LU90210A LU90210B1 (de) 1998-02-04 1998-02-04 Verfahren zum Chargieren eines Elektroofens mit pulverfoermigem Material

Publications (1)

Publication Number Publication Date
WO1999040229A1 true WO1999040229A1 (fr) 1999-08-12

Family

ID=19731738

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/000113 WO1999040229A1 (fr) 1998-02-04 1999-01-11 Procede pour charger un four electrique avec un corps creux rempli de materiau pulverulent

Country Status (5)

Country Link
EP (1) EP1051525A1 (fr)
AU (1) AU2516999A (fr)
BR (1) BR9907246A (fr)
LU (1) LU90210B1 (fr)
WO (1) WO1999040229A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2354527A (en) * 1999-09-24 2001-03-28 Rhs Paneltech Ltd Water cooled wire feed unit
WO2014009327A1 (fr) * 2012-07-10 2014-01-16 DÖRING-FREISSMUTH, Mechthilde Fil fourré et procédé de traitement de fer ou d'acier liquides

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2141176A1 (de) * 1971-08-17 1973-02-22 Messer Griesheim Gmbh Verfahren und vorrichtung zum behandeln von metallschmelzen
DE2310776A1 (de) * 1973-03-03 1974-09-12 Maximilianshuette Eisenwerk Verfahren und eintauchlanzen zum einleiten von sauerstoff in eine metallschmelze
EP0034994A1 (fr) * 1980-02-26 1981-09-02 VALLOUREC Société Anonyme dite. Produit composite à enveloppe tubulaire et âme en matière pulvérulente compactée et son procédé de fabrication
GB2139924A (en) * 1983-05-18 1984-11-21 Fulton Producing powder filled tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2141176A1 (de) * 1971-08-17 1973-02-22 Messer Griesheim Gmbh Verfahren und vorrichtung zum behandeln von metallschmelzen
DE2310776A1 (de) * 1973-03-03 1974-09-12 Maximilianshuette Eisenwerk Verfahren und eintauchlanzen zum einleiten von sauerstoff in eine metallschmelze
EP0034994A1 (fr) * 1980-02-26 1981-09-02 VALLOUREC Société Anonyme dite. Produit composite à enveloppe tubulaire et âme en matière pulvérulente compactée et son procédé de fabrication
GB2139924A (en) * 1983-05-18 1984-11-21 Fulton Producing powder filled tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2354527A (en) * 1999-09-24 2001-03-28 Rhs Paneltech Ltd Water cooled wire feed unit
WO2014009327A1 (fr) * 2012-07-10 2014-01-16 DÖRING-FREISSMUTH, Mechthilde Fil fourré et procédé de traitement de fer ou d'acier liquides

Also Published As

Publication number Publication date
EP1051525A1 (fr) 2000-11-15
LU90210B1 (de) 1999-08-05
AU2516999A (en) 1999-08-23
BR9907246A (pt) 2000-10-17

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