Methods of decontaminating substates with in-situ generated cyan

Details Methods of decontaminating substates with in-situ generated cyan Methods of decontaminating substates with in-situ generated cyan

1996-07-09

1997-10-14

Mai, Ngoclan

Hazardous or toxic waste destruction or containment

Destruction or containment of radioactive waste

588 18, 588236, 134 2, 210753, G21F 900

Patent

active

056782314

ABSTRACT:
Solid and liquid substrates, such as soil and solvents having radioactive metals or hazardous non-radioactive metals are decontaminated with the aid of cyanide ion generated in-situ to form co-ordination compounds with the unwanted metal contaminants. Cyanides are prepared by introducing into an ammoniacal liquid-containing slurry of a contaminated soil, or other solid or liquid substrate, a refrigerant compound, such as a hydrochlorofluorocarbon which produces ammonium cyanide, which in-turn forms a complex with the hazardous metal contaminant for separation with the ammoniacal liquid. The process may also utilize solvated electrons to at least partially dehalogenate a perhalogenated refrigerant like diclorodifluoromethane (R-12). Process avoids exposure to potentially hazardous cyanides through in-situ generation, while simultaneously destroying unwanted refrigerants which are potentially harmful to Earth's ozone layer.

REFERENCES:
patent: 3004075 (1961-10-01), Marcali
patent: 4853040 (1989-08-01), Mazur et al.
patent: 5110364 (1992-05-01), Mazur et al.
patent: 5411574 (1995-05-01), Turney et al.
patent: 5414200 (1995-05-01), Mouk et al.

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