Method for making anodes for aluminium production by fused-salt electrolysis, resulting anodes and use thereof
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United States of America Patent
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Jul 12, 2011
Grant Date -
Oct 8, 2009
app pub date -
May 10, 2007
filing date -
May 15, 2006
priority date (Note) -
Expired
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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.
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