WO2003018876B1 - Method for protecting electrodes during electrolysis cell start-up - Google Patents

Method for protecting electrodes during electrolysis cell start-up

Info

Publication number
WO2003018876B1
WO2003018876B1 PCT/US2002/026122 US0226122W WO03018876B1 WO 2003018876 B1 WO2003018876 B1 WO 2003018876B1 US 0226122 W US0226122 W US 0226122W WO 03018876 B1 WO03018876 B1 WO 03018876B1
Authority
WO
WIPO (PCT)
Prior art keywords
protective coating
cell
cathode
layer
carbon
Prior art date
Application number
PCT/US2002/026122
Other languages
French (fr)
Other versions
WO2003018876A3 (en
WO2003018876A2 (en
Inventor
Roy A Christini
Original Assignee
Alcoa Inc
Roy A Christini
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 Alcoa Inc, Roy A Christini filed Critical Alcoa Inc
Priority to AU2002332558A priority Critical patent/AU2002332558A1/en
Publication of WO2003018876A2 publication Critical patent/WO2003018876A2/en
Publication of WO2003018876A3 publication Critical patent/WO2003018876A3/en
Publication of WO2003018876B1 publication Critical patent/WO2003018876B1/en

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
    • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
    • C25C7/005—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells of cells for the electrolysis of melts
    • 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

Abstract

The present invention is directed to methods for applying a protective layer (42) to the cathode (40) of an electrolysis cell (10), where the cell also contains inert anodes (50) and the protective layer (42) can comprise a plurality of layers (70, 72, 74) with an inner layer (70) of TiB2 being preferred, and the protective layer (42) protects the cathode (40) from hot gases (64) used to pre-heat the cell (10).

Claims

AMENDED CLAIMS
[Received by the International Bureau on 28 May 2003 (28.05.03) ; original claim 1 amended ; original claims 2 to 14, unchanged]
1. A method for treating a carbon cathode in an electrolysis cell for producing metal comprising applying a protective coating to said cathode, wherein said protective coating is comprised of two or more layers including at least one inner layer selected from the group consisting of refractory material, metal, metal alloy, and an outer carbon layer of thickness 0.1mm to 1mm.
2. The method of claim 1, wherein an inert anode is also present in the electrolysis cell, and the electrolysis cell utilizes a gas pre-heat.
3. The method of claim 1, wherein said protective coating comprises at least one layer comprising TiB2.
4. The method of claim 1, wherein said protective coating is applied in a thickness of between about 0.1 mm and 10 mm.
5. The method of any of the preceding claims, wherein said protective coating comprises three layers including an inner layer of metal boride contacting the carbon cathode, a middle layer selected from the group consisting of the metal to be produced and the alloy of the metal to be produced, and a carbon outer layer.
6. The method of any of claims 1 -4, wherein each protective layer is applied in a thickness of between about 0.04 mm and about 5.0 mm, but where the protective coating is under 10 mm. 7. The method of any of claims 1-4, wherein said protective coating is effective to protect the cathode from hot gaseous pre-heat compounds used to pre-heat the cell and containing at least one of CO, CO2 and H , where oxygen in said compounds will react preferentially with the carbon layer, S. The method of claim 7, where said cell also includes an inert anode and said inert anode is protected from oxidation due to reaction of the hot gaseous compounds with an outer carbon layer of the protective coating. 9. An aluminum production electrolysis cell comprising an inert anode, and a coated carbon cathode where the cathode is coated with a protective coating comprised of an inner refractory material, a middle layer selected from aluminum and aluminum alloy and an outer carbon layer.
10. The production cell of claim 9, wherein said inert anode is a cermet inert anode.
11. The production cell of claim 9, wherein said protective coating is directly applied to a surface of said cathode, 12. The production cell of any of claims 9-11, further comprising one or more additional cell carbon components that are coated with said protective coating. 13. The production cell of any of claims 9-11, further comprising: a chamber containing a molten salt bath and alumina dissolved in said bath, 14. The production cell of any of claims 9- 11, where said protective coating is effective to protect the cathode from hot gaseous compounds containing at least one of CO, CO2 and H2O used to pre-heat the cell.
PCT/US2002/026122 2001-08-27 2002-08-15 Method for protecting electrodes during electrolysis cell start-up WO2003018876A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2002332558A AU2002332558A1 (en) 2001-08-27 2002-08-15 Method for protecting electrodes during electrolysis cell start-up

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/940,177 2001-08-27
US09/940,177 US6537438B2 (en) 2001-08-27 2001-08-27 Method for protecting electrodes during electrolysis cell start-up

Publications (3)

Publication Number Publication Date
WO2003018876A2 WO2003018876A2 (en) 2003-03-06
WO2003018876A3 WO2003018876A3 (en) 2003-09-25
WO2003018876B1 true WO2003018876B1 (en) 2004-05-21

Family

ID=25474373

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/026122 WO2003018876A2 (en) 2001-08-27 2002-08-15 Method for protecting electrodes during electrolysis cell start-up

Country Status (3)

Country Link
US (1) US6537438B2 (en)
AU (1) AU2002332558A1 (en)
WO (1) WO2003018876A2 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010039638B4 (en) * 2010-08-23 2015-11-19 Sgl Carbon Se Cathode, apparatus for aluminum extraction and use of the cathode in aluminum production
CN102234819B (en) * 2011-08-04 2013-02-13 中国铝业股份有限公司 Preheating starting method for aluminium electrolysis cell
CN102808196B (en) * 2012-07-27 2014-10-22 中国铝业股份有限公司 Direct-current shunt preheating start method for inert electrode aluminum electrolysis cell
JP6911812B2 (en) * 2018-06-06 2021-07-28 信越半導体株式会社 Anodizing equipment, anodizing method and cathode manufacturing method for anodizing equipment

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4399008A (en) 1980-11-10 1983-08-16 Aluminum Company Of America Composition for inert electrodes
US4374761A (en) 1980-11-10 1983-02-22 Aluminum Company Of America Inert electrode formulations
US4374050A (en) 1980-11-10 1983-02-15 Aluminum Company Of America Inert electrode compositions
DE3277506D1 (en) * 1981-07-27 1987-11-26 Commw Aluminium Corp Refractory hard material-carbon fiber cathode coatings for aluminum reduction cells
US4584172A (en) 1982-09-27 1986-04-22 Aluminum Company Of America Method of making composition suitable for use as inert electrode having good electrical conductivity and mechanical properties
US4582585A (en) 1982-09-27 1986-04-15 Aluminum Company Of America Inert electrode composition having agent for controlling oxide growth on electrode made therefrom
US4455211A (en) 1983-04-11 1984-06-19 Aluminum Company Of America Composition suitable for inert electrode
US4620905A (en) 1985-04-25 1986-11-04 Aluminum Company Of America Electrolytic production of metals using a resistant anode
EP0306100A1 (en) 1987-09-02 1989-03-08 MOLTECH Invent S.A. A composite ceramic/metal material
US5279715A (en) 1991-09-17 1994-01-18 Aluminum Company Of America Process and apparatus for low temperature electrolysis of oxides
US5310476A (en) 1992-04-01 1994-05-10 Moltech Invent S.A. Application of refractory protective coatings, particularly on the surface of electrolytic cell components
US5534130A (en) 1994-06-07 1996-07-09 Moltech Invent S.A. Application of phosphates of aluminum to carbonaceous components of aluminum production cells
US5492604A (en) 1994-12-28 1996-02-20 Aluminum Company Of America Coating composition for carbon electrodes
DE69735585T2 (en) * 1996-10-18 2006-11-02 Moltech Invent S.A. START-UP OF ELECTRIC CELLS TO OBTAIN ALUMINUM
US5865980A (en) 1997-06-26 1999-02-02 Aluminum Company Of America Electrolysis with a inert electrode containing a ferrite, copper and silver
US5794112A (en) 1997-06-26 1998-08-11 Aluminum Company Of America Controlled atmosphere for fabrication of cermet electrodes
NZ512075A (en) * 1998-12-16 2003-02-28 Alcan Int Ltd Multi-layer cathode structures
US6447667B1 (en) * 2001-01-18 2002-09-10 Alcoa Inc. Thermal shock protection for electrolysis cells

Also Published As

Publication number Publication date
WO2003018876A3 (en) 2003-09-25
WO2003018876A2 (en) 2003-03-06
US6537438B2 (en) 2003-03-25
US20030039759A1 (en) 2003-02-27
AU2002332558A1 (en) 2003-03-10

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