Removal of mercury and cadmium and their compounds from incinerator flue gases
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United States of America Patent
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Oct 29, 1996
Issued Date -
N/A
app pub date -
Mar 20, 1995
filing date -
Jun 10, 1993
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Abstract
Toxic metal vapor phase compounds, and in particular, mercury and cadmium, are removed from waste incinerator combustion gases by contact with dry alkaline material and dry activated carbon followed by solids separation. The resulting gas is subjected to quench/wet scrubbing with recycle hydrochloric acid solution formed in situ by absorption of HCl from the gas. Blowdown liquid withdrawn from the recycle acid liquor, may be recycled to the incinerator or further treated by neutralization, precipitation, and filtration of the precipitated toxic metals.
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