EP0115812A2 - Electrode conductrice de courant pour fours métallurgiques - Google Patents

Electrode conductrice de courant pour fours métallurgiques Download PDF

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Publication number
EP0115812A2
EP0115812A2 EP84100701A EP84100701A EP0115812A2 EP 0115812 A2 EP0115812 A2 EP 0115812A2 EP 84100701 A EP84100701 A EP 84100701A EP 84100701 A EP84100701 A EP 84100701A EP 0115812 A2 EP0115812 A2 EP 0115812A2
Authority
EP
European Patent Office
Prior art keywords
electrode
graphite
stones
electrode according
shaped
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Withdrawn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
EP84100701A
Other languages
German (de)
English (en)
Other versions
EP0115812A3 (fr
Inventor
Emil Dr. Elsner
Dietfried Reiber
Josef Messmer
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.)
C Conradty Nuernberg GmbH and Co KG
Original Assignee
Von Roll AG
C Conradty Nuernberg GmbH and Co KG
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 Von Roll AG, C Conradty Nuernberg GmbH and Co KG filed Critical Von Roll AG
Publication of EP0115812A2 publication Critical patent/EP0115812A2/fr
Publication of EP0115812A3 publication Critical patent/EP0115812A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/10—Mountings, supports, terminals or arrangements for feeding or guiding electrodes
    • H05B7/101—Mountings, supports or terminals at head of electrode, i.e. at the end remote from the arc

Definitions

  • the invention relates to a current-conducting electrode for metallurgical furnaces with an edible electrode tip and a liquid-carrying cooling system, and to a method for coating the electrode.
  • EP patent application No. 82109375.4 describes a graphite or carbon electrode for metallurgical furnaces, which is cooled below the burn-off temperature of the graphite by an internal cooling system.
  • this electrode it has been shown, depending on the cooling system, especially if it consists of longitudinal copper tubes, that part or all of the electrical current can be conducted via the copper tubes. The current then flows from the electrode contact jaws via the graphite to the cooling system made of copper pipes.
  • the current flow in the graphite is positively influenced by the fact that the electrical resistance reaches a minimum at the operating temperature of the electrode of around 600 ° C.
  • the water-conducting cooling system of the electrode also serves as a clamping system in connection with the end flanges, so that the graphite body can also be assembled from several pieces.
  • the object of the present invention is to design an electrode of the type described in the introduction in such a way that this erosion can be avoided by simple means and the durability of the electrode can thereby be improved.
  • This object is achieved according to the invention in that, in order to avoid chemical erosion in its lower region, the graphite is replaced by at least one ceramic molded stone.
  • the graphite in the lower part of the cooled electrode can advantageously be replaced by a ceramic molded block which has good thermal conductivity and is resistant to aggressive slags.
  • a ceramic molded block which has good thermal conductivity and is resistant to aggressive slags.
  • carbon-containing A1 2 0 3 or Mg0 stones have proven successful.
  • two or more shaped stones can be used.
  • the shaped block and the shaped blocks can expediently be reinforced, for example steel wool can be used as the reinforcement.
  • a water-cooled graphite electrode 1 with a ceramic lower part 2 is shown.
  • the total length of the electrode is, for example, approximately 4000 mm with a diameter of 500 mm.
  • the level of the ceramic Part is about 800 mm and dimensioned so that the contact jaws (not shown) of the electrode holder 3 are always in contact with graphite when repositioning.
  • the copper pipes with cooling water inlet and outlet are designated 4.
  • two graphite sections 5 are connected to a graphite nipple 6.
  • the box 7 is preserved in the upper graphite weft, so that the entire graphite part 5 can still be nippled as a consumable tip on the water-cooled copper nipple 8 after removal from the electrode.
  • the lower flange 9 is made of copper and is also cooled.
  • the upper flange 10 is made of austenitic steel, for example. It protrudes slightly above the graphite 5 in order to prevent the electrode 1 from slipping through the holder 3 for safety reasons. For safety reasons, the length of the electrode is also such that if it slipped in the lowest position of the electrode holder 3, the water-cooled nipple 8 could not be immersed in the liquid bath.
  • the flanges 9 and 10 serve in connection with the cooling tubes 4 and the nuts 11 as a clamping unit for the graphite pieces 5 and the ceramic part 2. This bracing would also be releasable differently than shown. It is also possible to insert an additional tension rod or tension tube 12 made of a material with a higher strength than copper into the system. If it is a tube, it can also be used to add gases or solids in the vicinity of the arc 13. In this case, the lower copper flange 9 with copper nipple 8 and the consumable graphite tip 14 must also be drilled through 15.
  • the lower copper flange 9 is provided on the outside with a recess 16 which is filled with electrically insulating materials (in the example shown with an asbestos cord 17). This avoids arcing that could destroy the flange.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Discharge Heating (AREA)
  • Electrolytic Production Of Metals (AREA)
EP84100701A 1983-01-28 1984-01-24 Electrode conductrice de courant pour fours métallurgiques Withdrawn EP0115812A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH507/83 1983-01-28
CH50783A CH655128A5 (de) 1983-01-28 1983-01-28 Stromleitende elektrode fuer metallurgische oefen.

Publications (2)

Publication Number Publication Date
EP0115812A2 true EP0115812A2 (fr) 1984-08-15
EP0115812A3 EP0115812A3 (fr) 1984-11-07

Family

ID=4188587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84100701A Withdrawn EP0115812A3 (fr) 1983-01-28 1984-01-24 Electrode conductrice de courant pour fours métallurgiques

Country Status (2)

Country Link
EP (1) EP0115812A3 (fr)
CH (1) CH655128A5 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218141A1 (fr) * 1985-09-27 1987-04-15 Great Lakes Carbon Corporation Joint d'électrode échancré pour électrodes refroidies par eau
US4853942A (en) * 1986-08-05 1989-08-01 Hylsa, S.A. De C.V. Graphite electrode with internal cooling for electric arc furnaces
WO2002062105A1 (fr) * 2001-02-01 2002-08-08 Techcom Import-Export Gmbh Procede de refroidissement d'une electrode pendant le fonctionnement d'un four electrique de fusion et electrode conçue a cet effet
WO2003077782A1 (fr) * 2002-03-20 2003-09-25 Fogazzi Di Venturelli Andrea & C. S.N.C. Catheter destine a un traitement de l'hyperthermie induit par une frequence radio
US7699605B2 (en) 2003-08-12 2010-04-20 3M Espe Ag Self-etching emulsion dental compositions and methods
US8404144B2 (en) 2002-12-30 2013-03-26 3M Innovative Properties Company Compositions including polymerizable bisphosphonic acids and methods
US8465284B2 (en) 2004-07-08 2013-06-18 3M Innovative Properties Company Dental methods, compositions, and kits including acid-sensitive dyes
US8722760B2 (en) 2004-08-11 2014-05-13 3M Innovative Properties Company Self-adhesive compositions including a plurality of acidic compounds
US9943465B2 (en) 2006-12-13 2018-04-17 3M Innovative Properties Company Methods of using a dental composition having an acidic component and a photobleachable dye

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE461094C (de) * 1925-05-06 1928-06-13 Siemens & Co Geb Kohleelektrode fuer elektrische OEfen
FR1255349A (fr) * 1959-10-02 1961-03-10 Procédé pour la fabrication d'aciers alliés et de fer pur
DE1565751A1 (de) * 1965-07-13 1970-02-12 Oestberg Jan Erik Elektrode fuer elektrische Lichtbogenoefen
EP0063711A1 (fr) * 1981-04-23 1982-11-03 Arc Technologies Systems, Ltd. Electrode pour four à arc et son utilisation

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2725537A1 (de) * 1977-06-06 1978-12-14 Korf Stahl Elektrode fuer lichtbogenoefen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE461094C (de) * 1925-05-06 1928-06-13 Siemens & Co Geb Kohleelektrode fuer elektrische OEfen
FR1255349A (fr) * 1959-10-02 1961-03-10 Procédé pour la fabrication d'aciers alliés et de fer pur
DE1565751A1 (de) * 1965-07-13 1970-02-12 Oestberg Jan Erik Elektrode fuer elektrische Lichtbogenoefen
EP0063711A1 (fr) * 1981-04-23 1982-11-03 Arc Technologies Systems, Ltd. Electrode pour four à arc et son utilisation

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0218141A1 (fr) * 1985-09-27 1987-04-15 Great Lakes Carbon Corporation Joint d'électrode échancré pour électrodes refroidies par eau
US4853942A (en) * 1986-08-05 1989-08-01 Hylsa, S.A. De C.V. Graphite electrode with internal cooling for electric arc furnaces
WO2002062105A1 (fr) * 2001-02-01 2002-08-08 Techcom Import-Export Gmbh Procede de refroidissement d'une electrode pendant le fonctionnement d'un four electrique de fusion et electrode conçue a cet effet
WO2003077782A1 (fr) * 2002-03-20 2003-09-25 Fogazzi Di Venturelli Andrea & C. S.N.C. Catheter destine a un traitement de l'hyperthermie induit par une frequence radio
US8404144B2 (en) 2002-12-30 2013-03-26 3M Innovative Properties Company Compositions including polymerizable bisphosphonic acids and methods
US7699605B2 (en) 2003-08-12 2010-04-20 3M Espe Ag Self-etching emulsion dental compositions and methods
US8029286B2 (en) 2003-08-12 2011-10-04 3M Innovative Properties Company Self-etching dental compositions and methods
US8465284B2 (en) 2004-07-08 2013-06-18 3M Innovative Properties Company Dental methods, compositions, and kits including acid-sensitive dyes
US8722760B2 (en) 2004-08-11 2014-05-13 3M Innovative Properties Company Self-adhesive compositions including a plurality of acidic compounds
US9943465B2 (en) 2006-12-13 2018-04-17 3M Innovative Properties Company Methods of using a dental composition having an acidic component and a photobleachable dye

Also Published As

Publication number Publication date
CH655128A5 (de) 1986-03-27
EP0115812A3 (fr) 1984-11-07

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Effective date: 19850401

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Owner name: C. CONRADTY NUERNBERG GMBH & CO. KG

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Effective date: 19861020

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Effective date: 19880802

RIN1 Information on inventor provided before grant (corrected)

Inventor name: ELSNER, EMIL, DR.

Inventor name: REIBER, DIETFRIED

Inventor name: MESSMER, JOSEF