EP0225548A2 - Brique pour électrode de fond, pour revêtement d'un four, ou connexion à un creuset - Google Patents

Brique pour électrode de fond, pour revêtement d'un four, ou connexion à un creuset Download PDF

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Publication number
EP0225548A2
EP0225548A2 EP86116468A EP86116468A EP0225548A2 EP 0225548 A2 EP0225548 A2 EP 0225548A2 EP 86116468 A EP86116468 A EP 86116468A EP 86116468 A EP86116468 A EP 86116468A EP 0225548 A2 EP0225548 A2 EP 0225548A2
Authority
EP
European Patent Office
Prior art keywords
brick
bricks
bottom electrode
porosity
rear lining
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.)
Granted
Application number
EP86116468A
Other languages
German (de)
English (en)
Other versions
EP0225548A3 (en
EP0225548B1 (fr
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/fr
Publication of EP0225548A3 publication Critical patent/EP0225548A3/en
Application granted granted Critical
Publication of EP0225548B1 publication Critical patent/EP0225548B1/fr
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 precharacterising 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.
EP86116468A 1985-12-02 1986-11-27 Brique pour électrode de fond, pour revêtement d'un four, ou connexion à un creuset Expired - Lifetime EP0225548B1 (fr)

Applications Claiming Priority (2)

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

Publications (3)

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

Family

ID=20362301

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86116468A Expired - Lifetime EP0225548B1 (fr) 1985-12-02 1986-11-27 Brique pour électrode de fond, pour revêtement d'un four, ou connexion à un creuset

Country Status (5)

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

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4541099A (en) * 1983-04-21 1985-09-10 Asea Aktiebolag DC Arc furnace improved hearth construction

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS50140509A (fr) * 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

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4541099A (en) * 1983-04-21 1985-09-10 Asea Aktiebolag DC Arc furnace improved hearth construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Also Published As

Publication number Publication date
SE8505660L (sv) 1987-06-03
EP0225548A3 (en) 1988-06-08
SE456878B (sv) 1988-11-07
ZA869000B (en) 1987-06-24
JP2605024B2 (ja) 1997-04-30
EP0225548B1 (fr) 1993-08-04
SE8505660D0 (sv) 1985-12-02
DE3688830D1 (de) 1993-09-09
DE3688830T2 (de) 1994-03-03
JPS62143888A (ja) 1987-06-27

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