Detoxifying spent aluminum potliners
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United States of America Patent
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Feb 20, 2001
Grant Date -
N/A
app pub date -
Feb 22, 1999
filing date -
Jan 14, 1997
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Expired
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Abstract
The method of the present invention detoxifies spent aluminum potliners to remove hazardous cyanides, fluorides, and polynuclear aromatics by reacting crushed potliners with a CaCl.sub.2 /HCl leach mill solution in the presence of iron. The method produces a solid waste suitable for landfill disposal and a recyclable reaction liquor. The reaction to destroy the polynuclear aromatics preferably occurs at a pH of no more than about 0.2, at about 120.degree. C. and 80 psig following destruction of the cyanides and converting of the fluorides to florspar in an initial oxidation at a lower temperature, lower pressure, and higher pH.
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