Recycling of spent pot linings
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United States of America Patent
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Jul 22, 2003
Grant Date -
Aug 22, 2002
app pub date -
Dec 8, 2000
filing date -
Dec 17, 1999
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Abstract
A process is described for the treatment of spent pot lining material from electrolyte reduction cells, this spent material having a substantial content of cryolite. The spent material is first leached with water at a dilution and a time sufficient to dissolve substantially all water soluble fluorides, after which the solid residue is separated from the liquid. The solid residue obtained is then subjected to a caustic leach with an aqueous sodium hydroxide solution containing about 20 to 50 g/L of NaOH and thereafter the solid residue is separated from the liquid.
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