EP1448810A2 - Structures d'anodes a base d'alliage pour la production d'aluminium - Google Patents

Structures d'anodes a base d'alliage pour la production d'aluminium

Info

Publication number
EP1448810A2
EP1448810A2 EP02755397A EP02755397A EP1448810A2 EP 1448810 A2 EP1448810 A2 EP 1448810A2 EP 02755397 A EP02755397 A EP 02755397A EP 02755397 A EP02755397 A EP 02755397A EP 1448810 A2 EP1448810 A2 EP 1448810A2
Authority
EP
European Patent Office
Prior art keywords
anode
members
metal
electrolyte
electrochemically active
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
EP02755397A
Other languages
German (de)
English (en)
Other versions
EP1448810B1 (fr
Inventor
Vittorio De Nora
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.)
Moltech Invent SA
Original Assignee
Moltech Invent SA
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 Moltech Invent SA filed Critical Moltech Invent SA
Publication of EP1448810A2 publication Critical patent/EP1448810A2/fr
Application granted granted Critical
Publication of EP1448810B1 publication Critical patent/EP1448810B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C25C3/12—Anodes

Definitions

  • the height of the tapered top part may be greater than half the size of the width of the anode member but preferably not greater than twice the size of the width of the anode member.
  • the surface of the tapered top part may have an average slope in the range of 30 and 75 deg, in particular 45 to 60 deg, to the horizontal.
  • the tapered top part permits an improved up-flow of electrolyte from the electrochemically active surface by delimiting an electrolyte up-flow path with a gradually increasing section that reduces or prevents the formation of flow-inhibiting turbulences adjacent and/or above the anode members in the electrolyte.
  • the overall height of the anode member is usually of the same order as its width, for instance from half to three times, in particular from equal to twice, the width.
  • the anode members 15 have an electrochemically active lower surface 16 on which during cell operation oxygen is anodically evolved.
  • the anode members 15 are in the form of parallel rods in a foraminate coplanar arrangement, laterally spaced apart from one another by inter-member gaps 17.
  • the inter-member gaps 17 constitute flow-through openings for the circulation of electrolyte and the escape of anodically-evolved gas from the electrochemically active surfaces 16.
  • the anodes 10 are further fitted with means for enhancing dissolution of fed alumina in the form of electrolyte guide members 5 formed of parallel spaced-apart inclined baffles 5 located above and adjacent to the foraminate anode structure 12,13,15.
  • the baffles 5 provide upper downwardly converging surfaces 6 and lower upwardly converging surfaces 7 that deflect gaseous oxygen which is anodically produced below the electrochemically active surface 16 of the anode members 15 and which escapes between the inter-member gaps 17 through the foraminate anode structure 12,13,15.
  • the oxygen released above the baffles 5 promotes dissolution of alumina fed into the electrolyte 30 above the downwardly converging surfaces 6.

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)
  • Powder Metallurgy (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

La présente invention concerne une anode à émission d'oxygène à base de métal durable (10) destinée à l'extraction électrolytique d'aluminium à partir d'alumine dissoute dans un électrolyte en fusion. Ladite anode présente une pluralité d'anodes électrochimiquement actives (15,15') espacées et parallèles les unes par rapport aux autres. Chaque anode (15) peut comprendre une partie inférieure (15a) qui présente une largeur sensiblement constante sur sa hauteur et qui est prolongée vers le haut par une partie supérieure conique (15b) destinée à guider une circulation d'électrolyte (30). La partie inférieure (15a) est généralement faite d'un alliage métallique présentant une surface inférieure d'oxyde (16) sensiblement plate qui est électrochimiquement active permettant l'oxydation de l'oxygène. L'alliage métallique peut comprendre un métal structural inerte, électriquement conducteur, et un métal actif pouvant se diffuser, qui lors de l'électrolyse se diffuse lentement sur la surface inférieure électrochimiquement active (16) où il est oxydé pour conserver la surface inférieure électrochimiquement active (16) et se dissout lentement dans l'électrolyte en fusion (30), auquel cas la partie inférieure (15a) forme un approvisionnement durable en métal actif pouvant être diffusé sur la surface inférieure électrochimiquement active (16).
EP02755397A 2001-07-13 2002-07-09 Structures d'anodes a base d'alliage pour la production d'aluminium Expired - Lifetime EP1448810B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
WOPCT/IB01/01275 2001-07-13
IB0101275 2001-07-13
PCT/IB2002/002732 WO2003006716A2 (fr) 2001-07-13 2002-07-09 Structures d'anodes a base d'alliage pour la production d'aluminium

Publications (2)

Publication Number Publication Date
EP1448810A2 true EP1448810A2 (fr) 2004-08-25
EP1448810B1 EP1448810B1 (fr) 2008-01-02

Family

ID=11004133

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02755397A Expired - Lifetime EP1448810B1 (fr) 2001-07-13 2002-07-09 Structures d'anodes a base d'alliage pour la production d'aluminium

Country Status (8)

Country Link
US (1) US20040231979A1 (fr)
EP (1) EP1448810B1 (fr)
AT (1) ATE382722T1 (fr)
AU (1) AU2002321684A1 (fr)
CA (1) CA2450071A1 (fr)
DE (1) DE60224436D1 (fr)
NO (1) NO20040143L (fr)
WO (1) WO2003006716A2 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE527398T1 (de) 2003-08-14 2011-10-15 Rio Tinto Alcan Int Ltd Zelle zur elektrogewinnung von metallen mit elektrolytreiniger
AU2005250240B2 (en) * 2004-06-03 2011-06-30 Rio Tinto Alcan International Limited High stability flow-through non-carbon anodes for aluminium electrowinning
WO2010127401A1 (fr) * 2009-05-07 2010-11-11 Aluminium Smelter Developments Pty Ltd Système de contact à coincement
CN101580949B (zh) * 2009-06-24 2010-08-25 中国铝业股份有限公司 一种提高铝电解槽稳定性的方法
CN102140652B (zh) * 2011-03-07 2012-09-19 陈虎政 一种新型铝电解用阳极及其生产方法
WO2014022394A1 (fr) * 2012-08-01 2014-02-06 Alcoa Inc. Électrodes inertes à faible chute tension et leurs procédés de fabrication
RU2698162C2 (ru) * 2017-03-01 2019-08-22 Общество с ограниченной ответственностью "Объединенная Компания РУСАЛ Инженерно-технологический центр" Перфорированный металлический инертный анод для получения алюминия электролизом расплава
CN108977851B (zh) * 2018-08-01 2020-05-05 新疆众和股份有限公司 一种电解铝用阳极钢爪

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3008116A1 (de) * 1980-03-03 1981-09-17 Conradty GmbH & Co Metallelektroden KG, 8505 Röthenbach Gasentwickelnde metallelektrode fuer elektrochemische prozesse
DE3345530A1 (de) * 1983-07-13 1985-06-27 Basf Ag, 6700 Ludwigshafen Gasentwickelnde metallelektrode fuer elektrolysezellen
DE60009455T2 (de) * 1999-01-08 2005-01-20 Moltech Invent S.A. Aluminium-elektrogewinnungszelle mit sauerstoffentwickelnden anoden
ES2234697T3 (es) * 1999-12-09 2005-07-01 Moltech Invent S.A. Anodos de base metalica para celdas de extraccion electrolitica.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03006716A2 *

Also Published As

Publication number Publication date
CA2450071A1 (fr) 2003-01-23
NO20040143L (no) 2004-01-13
WO2003006716A3 (fr) 2004-06-03
ATE382722T1 (de) 2008-01-15
US20040231979A1 (en) 2004-11-25
AU2002321684A1 (en) 2003-01-29
DE60224436D1 (de) 2008-02-14
WO2003006716A2 (fr) 2003-01-23
EP1448810B1 (fr) 2008-01-02

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Publication Publication Date Title
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EP1448810B1 (fr) Structures d'anodes a base d'alliage pour la production d'aluminium
AU2005250240B2 (en) High stability flow-through non-carbon anodes for aluminium electrowinning
AU2002321778B9 (en) Aluminium electrowinning cells with inclined cathodes
EP1147245B1 (fr) Cellule d'electrolyse a alimentation en alumine amelioree
US20080041729A1 (en) Aluminium Electrowinning With Enhanced Electrolyte Circulation
US7959772B2 (en) Aluminium electrowinning cells with sloping foraminate oxygen-evolving anodes
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