CONTROL OF BY-PASS CURRENT IN MULTI-POLAR LIGHT METAL REDUCTION CELLS
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United States of America Patent
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Issued Date -
Aug 12, 2010
app pub date -
Sep 3, 2008
filing date -
Sep 14, 2007
priority date (Note) -
Abandoned
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Abstract
The invention relates to a multi-polar reduction cell for production of a light metal by electrolysis. The cell has an anode, a cathode, and at least one current-conducting multi-polar electrode interposed between the anode and the cathode. The cell has a molten electrolyte containing a metal salt to be electrolyzed held within the cell and preferably has means to maintain an upper surface of the electrolyte at a predetermined level within the cell. The level is preferably maintained above the upper end of the multi-polar electrode(s), at least in use of the cell. The multi-polar electrode has an electrically insulating surface at its upper end that minimizes or eliminates by-pass current between the anode and cathode when the cell is operated. The invention also relates to the method of minimizing or eliminating the by-pass current.
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