EP0142459B1 - Cuve d'électrolyse - Google Patents

Cuve d'électrolyse Download PDF

Info

Publication number
EP0142459B1
EP0142459B1 EP84810364A EP84810364A EP0142459B1 EP 0142459 B1 EP0142459 B1 EP 0142459B1 EP 84810364 A EP84810364 A EP 84810364A EP 84810364 A EP84810364 A EP 84810364A EP 0142459 B1 EP0142459 B1 EP 0142459B1
Authority
EP
European Patent Office
Prior art keywords
layer
granulate
vat
electrolysis
ground
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
Application number
EP84810364A
Other languages
German (de)
English (en)
Other versions
EP0142459A1 (fr
Inventor
Wilhelm Scharpey
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.)
Rio Tinto Switzerland AG
Original Assignee
Schweizerische Aluminium AG
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 Schweizerische Aluminium AG filed Critical Schweizerische Aluminium AG
Priority to AT84810364T priority Critical patent/ATE29156T1/de
Publication of EP0142459A1 publication Critical patent/EP0142459A1/fr
Application granted granted Critical
Publication of EP0142459B1 publication Critical patent/EP0142459B1/fr
Expired 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
    • C25C3/085—Cell construction, e.g. bottoms, walls, cathodes characterised by its non electrically conducting heat insulating parts

Definitions

  • the present invention relates to an electrolysis trough for the production of aluminum by melt flow electrolysis, consisting of an outer steel trough, a heat-insulating layer and an inner lining consisting essentially of carbon with iron cathode bars.
  • the productive part of the energy consumption is needed to reduce the A1 3 + cations to metallic aluminum. This productive part of energy consumption cannot be reduced.
  • the energy losses can be divided into various components, all of which affect the environment as heat losses.
  • the heat generated during the electrolysis process always flows to colder parts of the tub, from where it escapes to the surroundings and thus draws energy from the production process. These heat losses can be controlled and must be kept to a minimum.
  • the voltage drop and thus the energy loss in the electrical circuit can be reduced to a minimum.
  • EP-A-63 547 describes an electrolysis trough in which at least the lower 80% of the bottom insulation consists of a solidified volcanic ash layer, the remaining bottom insulation consists of a leak barrier, which preferably consists of powdered alumina and shields the volcanic ash against bath components penetrating the carbon lining .
  • the side wall of the steel tub is insulated with moler or firebricks.
  • the inventor has set himself the task of creating an electrolysis trough for the production of aluminum by melt flow electrolysis, in which the production costs for the thermal insulation can be significantly reduced without the quality of the trough in terms of thermal insulation and service life suffering as a result.
  • the object is achieved according to the invention in that, in the case of an electrolysis bath, at least the lower 75% of the bottom insulation consists of a layer of a granulate solidified by mechanical means with a grain size which varies substantially between 0.01 and 8 mm, which is the completely ground, but otherwise untreated Insulation layers - without the coal residues mechanically sorted out before grinding - of replaced electrolysis trays, and the remaining 0 to 25% consist of a layer of firebricks, ground firebricks and / or metallurgical clay, while the side walls of the steel tray are insulated exclusively with firebricks.
  • the grain size of the ground granules is preferably between 0.1 and 4 mm.
  • these four stone layers are broken out of the electrolytic cell to be replaced and ground. Any coal pieces are mechanically sorted out beforehand, as are the larger pieces of solidified aluminum.
  • the ground granulate therefore consists mainly of moler stones, to a smaller extent of chamotte and can also contain smaller amounts of aluminum.
  • the height of the solidified granulate layer is preferably 250-300 mm.
  • a layer of firebricks, ground firebricks and / or aluminum oxide is expediently placed thereon, but is preferably not thicker than 100 mm.
  • an impermeable, flexible graphite membrane which is connected to a carrier foil made of steel, can also be used (see TMS Paper No. LM 78/19 or DE-OS 2817 202) the granules are laid.
  • the granulate is poured dry into the cell and then mechanically compacted, for example by pounding and / or vibrating. Wet granules are appropriately dried beforehand.

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)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Materials Applied To Surfaces To Minimize Adherence Of Mist Or Water (AREA)
  • Medicines Containing Plant Substances (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Cookers (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)

Claims (5)

1. Cuve d'électrolyse pour la fabrication d'aluminium par électrolyse ignée, composée d'une cuve extérieure en acier, d'une couche d'isolation isolante de la chaleur et d'un revêtement intérieur essentiellement composé de charbon, avec des barres cathodiques en fer, dans laquelle au moins les 75% inférieurs de l'isolation du fond sont constitués par une couche, tassée par des moyens mécaniques, formée d'un granulat d'une grosseur de grain qui varie sensi- blemententre 0,01 et 8 mm, granulat qui contient les couches d'isolation, entièrement broyées mais sans autre traitement, de cuves d'électrolyse remplacées - sans les résidus de charbon, qui ont été éliminés par triage mécanique avant le broyage - et les 0 à 25% restants sont constitués par une couche de briques de chamotte, briques de chamotte broyées et/ ou d'alumine technique, tandis que les parois latérales de la cuve en acier sont isolées exclusivement avec des briques de chamotte.
2. Cuve d'électrolyse selon la revendication 1, caractérisée en ce que le granulat broyé est principalement composé de briques de Moler et, pour une plus petite proportion, de chamotte, selon la matière d'isolation des cuves d'électrolyse remplacées, et d'inclusions d'aluminium.
3. Cuve d'électrolyse selon la revendication 1 ou la revendication 2, caractérisée en ce que l'épaisseur de la couche de granulat tassée est de 250 à 300 mm.
4. Cuve d'électrolyse selon au moins l'une des revendications 1 à 3, caractérisée en ce que, sur la couche de granulat tassée, est disposée une membrane de graphite, imperméable, flexible, qui est assemblée à une feuille support en acier.
5. Cuve d'électrolyse selon au moins l'une des revendications 1 à 4, caractérisée en ce que la grosseur de grain du granulat broyé varie entre 0,1 et 4 mm.
EP84810364A 1983-08-25 1984-07-24 Cuve d'électrolyse Expired EP0142459B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84810364T ATE29156T1 (de) 1983-08-25 1984-07-24 Elektrolysewanne.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4633/83A CH657629A5 (de) 1983-08-25 1983-08-25 Elektrolysewanne.
CH4633/83 1983-08-25

Publications (2)

Publication Number Publication Date
EP0142459A1 EP0142459A1 (fr) 1985-05-22
EP0142459B1 true EP0142459B1 (fr) 1987-08-26

Family

ID=4279781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84810364A Expired EP0142459B1 (fr) 1983-08-25 1984-07-24 Cuve d'électrolyse

Country Status (9)

Country Link
US (1) US4548692A (fr)
EP (1) EP0142459B1 (fr)
AT (1) ATE29156T1 (fr)
AU (1) AU573604B2 (fr)
CA (1) CA1239375A (fr)
CH (1) CH657629A5 (fr)
DE (1) DE3465611D1 (fr)
IS (1) IS1313B6 (fr)
NO (1) NO161575C (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0193491A1 (fr) * 1985-02-15 1986-09-03 Schweizerische Aluminium Ag Cuve d'électrolyse
GB8522138D0 (en) * 1985-09-06 1985-10-09 Alcan Int Ltd Linings for aluminium reduction cells
RU2155305C2 (ru) * 1999-08-31 2000-08-27 Открытое акционерное общество "Красноярский алюминиевый завод" Холоднонабивная подовая масса
US7004564B2 (en) 2003-07-31 2006-02-28 Hewlett-Packard Development Company, L.P. Printing-fluid container
CN102091674A (zh) * 2010-11-22 2011-06-15 遵义铝业股份有限公司劳动服务公司 一种用于从电解铝炭渣中生产再生氟化盐的浮选剂

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3457158A (en) * 1964-10-02 1969-07-22 Reynolds Metals Co Cell lining system
US3635408A (en) * 1970-08-25 1972-01-18 Alcan Res & Dev Treatment of carbon lining from reduction cells
US3723286A (en) * 1971-11-08 1973-03-27 Kaiser Aluminium Chem Corp Aluminum reduction cell
US4033836A (en) * 1976-10-21 1977-07-05 Aluminum Company Of America Electrolytic reduction cell
US4175022A (en) * 1977-04-25 1979-11-20 Union Carbide Corporation Electrolytic cell bottom barrier formed from expanded graphite
CH653711A5 (de) * 1981-04-22 1986-01-15 Alusuisse Elektrolysewanne.
ZA824255B (en) * 1981-06-25 1983-05-25 Alcan Int Ltd Electrolytic reduction cells
US4411758A (en) * 1981-09-02 1983-10-25 Kaiser Aluminum & Chemical Corporation Electrolytic reduction cell

Also Published As

Publication number Publication date
DE3465611D1 (en) 1987-10-01
ATE29156T1 (de) 1987-09-15
NO161575B (no) 1989-05-22
AU573604B2 (en) 1988-06-16
NO843364L (no) 1985-02-26
AU3136984A (en) 1985-02-28
CH657629A5 (de) 1986-09-15
IS1313B6 (is) 1988-03-22
EP0142459A1 (fr) 1985-05-22
US4548692A (en) 1985-10-22
NO161575C (no) 1989-08-30
CA1239375A (fr) 1988-07-19
IS2933A7 (is) 1985-02-26

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