EP1461476A1 - Procede de graphitisation de blocs cathodiques - Google Patents

Procede de graphitisation de blocs cathodiques

Info

Publication number
EP1461476A1
EP1461476A1 EP02796688A EP02796688A EP1461476A1 EP 1461476 A1 EP1461476 A1 EP 1461476A1 EP 02796688 A EP02796688 A EP 02796688A EP 02796688 A EP02796688 A EP 02796688A EP 1461476 A1 EP1461476 A1 EP 1461476A1
Authority
EP
European Patent Office
Prior art keywords
cathode blocks
graphitization
cathode
blocks
conductive bodies
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Withdrawn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
EP02796688A
Other languages
German (de)
English (en)
Inventor
Johann Daimer
Frank Hiltmann
Jörg MITTAG
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.)
SGL Carbon SE
Original Assignee
SGL Carbon SE
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7710907&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1461476(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by SGL Carbon SE filed Critical SGL Carbon SE
Publication of EP1461476A1 publication Critical patent/EP1461476A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/08—Cell construction, e.g. bottoms, walls, cathodes

Definitions

  • the material of the cathode blocks is preferably carbon because of the required chemical and thermal resistance, which can be partially or completely graphitized by thermal treatment.
  • mixtures of pitches, cokes, anthracite and / or graphite in selected particle sizes or particle size distributions for the solids are mixed, shaped and fired and optionally (partially) graphitized.
  • the firing (carbonization) usually takes place at temperatures of approx. 1200 ° C, the graphitization usually at temperatures of approx. 2400 ° C.
  • One way to equalize the removal over the length of the cathode block and thus to extend the service life is to design the cathode blocks so that their electrical resistance varies over the length such that the current density (and thus the Wear) is uniform over its length or at least exhibits the smallest possible deviation over the length from its mean value.
  • a solution is described in DE 20 61 263, in which composite cathodes are formed either from several carbon blocks with different electrical conductivity, which are arranged in such a way that a uniform or approximately uniform current distribution results, or from carbon blocks, the electrical resistances of which are in the direction of the cathodic Derivatives increase continuously.
  • the number of carbon blocks and their electrical resistance depend on the cell size and cell p, they must be recalculated for each case.
  • Cathode blocks made of a large number of individual carbon blocks require a great deal of effort in the construction; the joints must also be properly sealed to prevent the liquid aluminum from flowing out at the joints.
  • WO 00/46426 describes a graphite cathode which consists of a single block which has an electrical conductivity which is variable over its length, the conductivity at the ends of the block being lower than in the middle.
  • This uneven distribution of electrical conductivity is achieved by bringing the end zones to a temperature of 2200 to 2500 ° C. during the graphitization, while exposing the middle zone to a temperature of 2700 to 3000 ° C.
  • This different heat treatment can be achieved according to this teaching in two ways: first, the heat dissipation in the graphitization furnace can be limited differently, or heat sinks can be introduced in the vicinity of the end zones, which increase the heat loss.
  • the density of the heat-insulating bed is changed so that the heat loss becomes uneven over the length of the cathodes and the desired temperatures are thus set.
  • the heat loss in the vicinity of the ends can be increased by different designs of the heat-insulating bed, or for this purpose heat-dissipating bodies made of graphite are preferably introduced in their vicinity, which cause a greater heat flow to the outside of the furnace wall.
  • the contact bodies are preferably designed such that they show the profile of an H in the side view, without the two lower legs, the cathode blocks resting on the contact bodies in such a way that they press on them by their weight and thereby apply the surface pressure required for the power line ,
  • the conductive contact bodies must withstand the high temperatures that occur and should also have the highest possible conductivity. Such bodies have proven themselves, which consist of at least 50% of their mass of graphite. Bodies which consist of more than 80% graphite are particularly preferred; bodies which consist of pure graphite or of graphite with a maximum of 5% of their mass of admixtures are particularly suitable.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

L'invention concerne un procédé de graphitisation de blocs cathodiques, destinés à la production électrolytique d'aluminium, d'après la méthode de graphitisation en long. Ce procédé se caractérise en ce que les blocs cathodiques sont disposés dans un four de graphitisation en long de telle sorte que la distance entre leurs extrémités soit comprise entre 25 et 150 mm et en ce que le transfert de courant entre les différents blocs cathodiques se fasse par l'intermédiaire de corps conducteurs, les blocs cathodiques étant placés deux à deux sur les corps conducteurs de telle sorte que le contact entre ces blocs et lesdits corps soit établi par l'intermédiaire de la force de gravité s'exerçant sur les blocs cathodiques. L'invention concerne en outre les blocs cathodiques obtenus par ce procédé, ainsi que leur utilisation pour la réduction électrolytique d'oxyde d'aluminium.
EP02796688A 2001-12-28 2002-12-19 Procede de graphitisation de blocs cathodiques Withdrawn EP1461476A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10164013 2001-12-28
DE2001164013 DE10164013C1 (de) 2001-12-28 2001-12-28 Verfahren zum Graphitieren von Kathodenblöcken
PCT/EP2002/014550 WO2003056070A1 (fr) 2001-12-28 2002-12-19 Procede de graphitisation de blocs cathodiques

Publications (1)

Publication Number Publication Date
EP1461476A1 true EP1461476A1 (fr) 2004-09-29

Family

ID=7710907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02796688A Withdrawn EP1461476A1 (fr) 2001-12-28 2002-12-19 Procede de graphitisation de blocs cathodiques

Country Status (8)

Country Link
EP (1) EP1461476A1 (fr)
AR (1) AR037917A1 (fr)
AU (1) AU2002361175A1 (fr)
BR (1) BR0215322A (fr)
CA (1) CA2470757A1 (fr)
DE (1) DE10164013C1 (fr)
PL (1) PL368809A1 (fr)
WO (1) WO2003056070A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10164011C1 (de) * 2001-12-28 2003-05-08 Sgl Carbon Ag Verfahren zum Graphitieren von Kathodenblöcken
DE102010029538A1 (de) * 2010-05-31 2011-12-01 Sgl Carbon Se Kohlenstoffkörper, Verfahren zur Herstellung eines Kohlenstoffkörpers und seine Verwendung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA968744A (en) * 1970-12-12 1975-06-03 Kurt Lauer Cathode for the winning of aluminum
DE3606380A1 (de) * 1986-02-27 1987-09-03 Sigri Gmbh Hochstromofen zum graphitieren von kohlenstoffkoerpern
FR2789091B1 (fr) * 1999-02-02 2001-03-09 Carbone Savoie Cathode graphite pour l'electrolyse de l'aluminium
US6231745B1 (en) * 1999-10-13 2001-05-15 Alcoa Inc. Cathode collector bar
US20020000373A1 (en) * 2000-05-22 2002-01-03 Hirofumi Ninomiya Graphitized cathode block for aluminum smelting

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03056070A1 *

Also Published As

Publication number Publication date
DE10164013C1 (de) 2003-04-03
WO2003056070A1 (fr) 2003-07-10
AU2002361175A1 (en) 2003-07-15
PL368809A1 (en) 2005-04-04
BR0215322A (pt) 2004-10-19
AR037917A1 (es) 2004-12-22
CA2470757A1 (fr) 2003-04-10

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