Process And System For Treating Waste From Aluminum Production Containing PAH And Fluoride Ions By Flotation And Stabilization
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United States of America Patent
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Issued Date -
Apr 16, 2009
app pub date -
May 12, 2008
filing date -
May 11, 2007
priority date (Note) -
Abandoned
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Abstract
A process for treating a waste material coming from aluminum production, the waste material containing contaminants polycyclic aromatic hydrocarbons (PAH) and inorganic fluoride compounds containing fluoride ions, involves flotation of a waste mixture of the waste material in the presence of a surfactant capable of producing PAH-rich micelles that are floated to produce froth containing the PAH-rich micelles; and stabilization of the waste mixture by adding a fluoride ion stabilizer to form stabilized fluoride compounds with reduced solubility in the waste mixture and in a toxicity characteristics leaching procedure test, to produce decontaminated solids containing the stabilized fluoride compounds and a leachate solution.
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