Methods for reducing ammonia evolution from cementitious and...

Details Methods for reducing ammonia evolution from cementitious and... Methods for reducing ammonia evolution from cementitious and...

2011-03-01

2011-03-01

Kreck, John (Department: 3672)

Hazardous or toxic waste destruction or containment

Containment

Treating a solid to prevent gas emissions

C588S313000

Reexamination Certificate

active

07897830

ABSTRACT:
A method is provided for reducing the amount of ammonia evolved from a cementitious or pozzolanic mixture containing contaminated fly ash, including: providing fly ash contaminated with ammonia or ammonium-containing compounds; and adding a halogenated hydantoin to the contaminated fly ash, wherein upon the formation of a slurry, the halogenated hydantoin reacts with ammonia to reduce the evolution of ammonia gas from the slurry. Another method includes adding a halogenated succinimide to the contaminated fly ash, adding sodium dichloroisocyanurate to the contaminated fly ash, or adding a halogenated sulfamate to the contaminated fly ash.

REFERENCES:
patent: 6046946 (2000-04-01), Nadeau-Dostie et al.
patent: 6790264 (2004-09-01), Minkara
patent: 0427517 (1991-05-01), None
patent: 0166486 (2001-09-01), None
patent: 2006/029190 (2006-03-01), None
patent: WO2009 027048 (2009-03-01), None

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