EP0225548B1 - Ziegel für Bodenelektrode, Ofenauskleidung oder Verbindung zu einem Tiegel - Google Patents

Ziegel für Bodenelektrode, Ofenauskleidung oder Verbindung zu einem Tiegel Download PDF

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Publication number
EP0225548B1
EP0225548B1 EP86116468A EP86116468A EP0225548B1 EP 0225548 B1 EP0225548 B1 EP 0225548B1 EP 86116468 A EP86116468 A EP 86116468A EP 86116468 A EP86116468 A EP 86116468A EP 0225548 B1 EP0225548 B1 EP 0225548B1
Authority
EP
European Patent Office
Prior art keywords
brick
bricks
porosity
porous material
bottom electrode
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 - Lifetime
Application number
EP86116468A
Other languages
English (en)
French (fr)
Other versions
EP0225548A2 (de
EP0225548A3 (en
Inventor
Bo Rappinger
Sven-Einar Stenkvist
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.)
ABB Norden Holding AB
Original Assignee
ASEA AB
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 ASEA AB filed Critical ASEA AB
Publication of EP0225548A2 publication Critical patent/EP0225548A2/de
Publication of EP0225548A3 publication Critical patent/EP0225548A3/en
Application granted granted Critical
Publication of EP0225548B1 publication Critical patent/EP0225548B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H05B7/06—Electrodes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/0003—Linings or walls
    • F27D1/0006—Linings or walls formed from bricks or layers with a particular composition or specific characteristics
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
    • F27D1/06—Composite bricks or blocks, e.g. panels, modules
    • F27D1/063—Individual composite bricks or blocks

Definitions

  • the invention relates to a brick for a bottom electrode, a rear lining or a hearth connection according to the pre-characterising part of claim 1.
  • Insulating bricks with a varying degree of open porosity are available on the market.
  • these bricks involve two decisive disadvantages. They are not electrically conductive and their mechanical strength is too poor for them to be used as rear insulating lining.
  • gas flushing bricks with a directional open porosity are available on the market, but these bricks are electrically non-conductive.
  • the invention aims at developing a brick of the above-mentioned kind, which combines good electrical conductivity, good heat insulating, and considerable mechanical strength.
  • an electrically conductive, carbonaceous material has been added, completely or partially, to the open porosity.
  • the cold compression strength of chemically bound magnesite graphite bricks is 20-35 MPa and for insulating bricks about 2 MPa.
  • the mechanical strength after impregnation and heat treatment (carried out once or several times) is increased.
  • spray treatment can be carried out as well.
  • the impregnating agent may, for example, consist of tar, pitch or resin, or of a suspension of graphite, soot or the like, or synthetic resin.
  • the heat treatment is suitably carried out at a temperature when the binder is being coked, for example at 350°C or thereabove.
  • the channels are filled with a material which, in the same way as described above, is allowed to coke.
  • a sectional surface of channels of 3-30 % may be sufficient for the bottom of a d.c. arc furnace.
  • the d.c. arc furnace in Figure 1 is provided with an electrode having a hollow channel for reduction purposes.
  • the arc 1 is struck between the electrode and the melt 2.
  • Numerals 3, 4, 5 and 6 designate the various brick layers, with 3 being the layer located nearest to the melt 2 and 6 the layer located nearest to the hearth connection.
  • Figure 2 shows the brick layers (3-5) in greater detail and also the hearth connection 7.
  • Either layer 5 or layer 6, that is, that part of the brick bottom or wall located nearest to the cold side, may consist of bricks according to the invention.
  • Figure 3 shows a pressed brick of aluminium oxides, magnesite, or zirconium oxide.
  • the brick is porous, and the open pores 8 have been impregnated with a carbonaceous material, for example pitch, tar, a suspension of graphite, soot or the like, synthetic resin, etc., for the purpose of achieving a carbon content in the brick which constitutes a conductor for the current, that is, the brick is electrically conductive while at the same time its porosity provides for good thermal insulation.
  • a carbonaceous material for example pitch, tar, a suspension of graphite, soot or the like, synthetic resin, etc.
  • bricks which are chemically or ceramically bound and have a porosity of about 20 % By using bricks which are chemically or ceramically bound and have a porosity of about 20 %, a content of carbonized residue of at the most 5 per cent by weight can be attained by means of impregnation. With a porosity of 50-90 %, contents of carbonized residue of 13-23 % can be attained.
  • spraying of the bricks can be used. In certain cases, only spraying may be sufficient.
  • the treatment can be carried out once or several times.
  • the cold compression strength of the chemically bound magnesite graphite bricks is 20-35 MPa and for insulating bricks about 2 MPa.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Conductive Materials (AREA)
  • Ceramic Products (AREA)
  • Discharge Heating (AREA)
  • Furnace Details (AREA)

Claims (5)

  1. Ziegel zur Verwendung in einer Bodenelektrode, einer Ofenauskleidung oder einem Herdanschluß bei einem Gleichstrom-Lichtbogenofen, dadurch gekennzeichnet, daß der Ziegel aus einem porösen Material besteht, dessen elektrische Leitfähigkeit für die vorgenannten Zwecke zu klein ist, daß das genannte poröse Material imprägniert worden ist durch Eintauchen in oder durch Besprühen mit einer organischen Flüssigkeit und daß danach der Ziegel derart verkohlt worden ist, daß kohlehaltige, den elektrischen Strom leitende Pfade entstanden sind, welche den Ziegel ausreichend elektrisch leitfähig machen.
  2. Ziegel nach Anspruch 1, dadurch gekennzeichnet, daß die genannte organische Flüssigkeit zur Imprägnierung des genannten porösen Materials aus Pech, Teer, Harz oder einer Suspension aus Graphit, Ruß oder synthetischem Harz besteht.
  3. Ziegel nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß das Verkohlen des Ziegels bei einer Temperatur von 350°C durchgeführt wurde.
  4. Ziegel nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß er eine Porosität von 50 - 90 Prozent hat und einen Gehalt an durchkohlten Rückständen nach der Behandlung von 13 - 23 Gewichtsprozent.
  5. Ziegel nach einem der Ansprüche 1 - 4, dadurch gekennzeichnet, daß er eine gerichtete Porosität ("gas flushing"-Ziegel) hat, durch welche Kanäle im Ziegel entstanden sind, welche mit einem kohlehaltigem Material gefüllt sind, welches verkohlt wird, wobei diese Kanäle 3 - 30 Prozent der Schnittfläche des Ziegels einnehmen.
EP86116468A 1985-12-02 1986-11-27 Ziegel für Bodenelektrode, Ofenauskleidung oder Verbindung zu einem Tiegel Expired - Lifetime EP0225548B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8505660A SE456878B (sv) 1985-12-02 1985-12-02 Foerfarande vid uppbyggnad av en likstroemsljusbaagsugn
SE8505660 1985-12-02

Publications (3)

Publication Number Publication Date
EP0225548A2 EP0225548A2 (de) 1987-06-16
EP0225548A3 EP0225548A3 (en) 1988-06-08
EP0225548B1 true EP0225548B1 (de) 1993-08-04

Family

ID=20362301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86116468A Expired - Lifetime EP0225548B1 (de) 1985-12-02 1986-11-27 Ziegel für Bodenelektrode, Ofenauskleidung oder Verbindung zu einem Tiegel

Country Status (5)

Country Link
EP (1) EP0225548B1 (de)
JP (1) JP2605024B2 (de)
DE (1) DE3688830T2 (de)
SE (1) SE456878B (de)
ZA (1) ZA869000B (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3130208B2 (ja) 1994-06-17 2001-01-31 旭硝子株式会社 直流電気炉の炉床及びその施工方法
CN107244930A (zh) * 2017-05-24 2017-10-13 方大炭素新材料科技股份有限公司 一种耐铁水侵蚀高炉炭砖及其制备方法

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50140509A (de) * 1973-12-27 1975-11-11
JPS51105314A (en) * 1975-03-12 1976-09-17 Nikku Ind Co Kaabondenkyoku taikarengatono pichishinkukaatsuganshinkaatsushoontankahoho
IT1152141B (it) * 1982-05-13 1986-12-31 Caffaro Spa Ind Chim Procedimento per la produzione continua di tetracloraftalonitrile in un reattore a letto fluido
DE3413745C2 (de) * 1983-04-21 1994-03-03 Asea Ab Gleichstromlichtbogenofen

Also Published As

Publication number Publication date
JPS62143888A (ja) 1987-06-27
SE456878B (sv) 1988-11-07
SE8505660D0 (sv) 1985-12-02
JP2605024B2 (ja) 1997-04-30
DE3688830T2 (de) 1994-03-03
ZA869000B (en) 1987-06-24
DE3688830D1 (de) 1993-09-09
EP0225548A2 (de) 1987-06-16
EP0225548A3 (en) 1988-06-08
SE8505660L (sv) 1987-06-03

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