Method for making anodes for aluminium production by...

Details Method for making anodes for aluminium production by... Method for making anodes for aluminium production by...

2011-07-12

2011-07-12

Bell, Bruce F (Department: 1759)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S243100, C204S247300, C204S290150, C205S384000, C205S386000, C205S387000, C205S388000, C029S746000

Reexamination Certificate

active

07976688

ABSTRACT:
Method for manufacturing anodes used for the production of aluminium by fused bath electrolysis, said anodes comprising an anode stem made of a conducting metal and at least one block made of carbonaceous material called an anode block, said method including at least the following steps:a) obtain an anode stem;b) obtain a new anode block;c) fix one end of the anode stem onto the anode block, so as to give good mechanical attachment and good electrical connection between said stem and said anode block;said method being characterised in that before, during or after step c), but before placement of said anode in the electrolytic cell, a protective layer with a controlled thickness, typically between 5 and 25 cm composed of a material resistant to temperature and corrosion by the medium above the electrolytic bath is at least partially deposited on the upper surface of said anode block.

REFERENCES:
patent: 3829374 (1974-08-01), Kugler et al.
patent: 4490233 (1984-12-01), Casdas
patent: 4569835 (1986-02-01), Di Cio et al.
patent: 4659442 (1987-04-01), Naterstad et al.
patent: 5096631 (1992-03-01), Syversen
patent: 5985114 (1999-11-01), Sekhar et al.

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