Stabilization of heavy metals in ash
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United States of America Patent
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Jul 22, 1997
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N/A
app pub date -
Feb 14, 1996
filing date -
Feb 14, 1996
priority date (Note) -
Expired
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Abstract
This invention relates to a process for stabilizing heavy metals in ash. The steps of the process include: (a) preparing an aqueous slurry of ash and water; (b) decreasing the pH of the aqueous slurry to less than about 5.0 in the presence of an iron salt; (c) treating the aqueous slurry with (1) an organo sulfur containing compound, (2) an alkaline extract of peat moss, and (3) an alkaline earth metal containing compound. Heavy metals in ash treated by this process will not leach into the environment.
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