Process for the encapsulation and stabilization of radioactive, hazardous and mixed wastes
- Patchogue, NY
- Wading River, NY
The present invention provides a method for encapsulating and stabilizing radioactive, hazardous and mixed wastes in a modified sulfur cement composition. The waste may be incinerator fly ash or bottom ash including radioactive contaminants, toxic metal salts and other wastes commonly found in refuse. The process may use glass fibers mixed into the composition to improve the tensile strength and a low concentration of anhydrous sodium sulfide to reduce toxic metal solubility. The present invention preferably includes a method for encapsulating radioactive, hazardous and mixed wastes by combining substantially anhydrous wastes, molten modified sulfur cement, preferably glass fibers, as well as anhydrous sodium sulfide or calcium hydroxide or sodium hydroxide in a heated double-planetary orbital mixer. The modified sulfur cement is preheated to about 135.degree..+-.5.degree. C., then the remaining substantially dry components are added and mixed to homogeneity. The homogeneous molten mixture is poured or extruded into a suitable mold. The mold is allowed to cool, while the mixture hardens, thereby immobilizing and encapsulating the contaminants present in the ash.
- Research Organization:
- Associated Universities, Inc., Upton, NY (United States)
- DOE Contract Number:
- AC02-76CH00016
- Assignee:
- Associated Universities, Inc. (Washington, DC)
- Patent Number(s):
- US 5678234
- Application Number:
- 08/334,930
- OSTI ID:
- 871187
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
encapsulation
stabilization
radioactive
hazardous
mixed
wastes
provides
method
encapsulating
stabilizing
modified
sulfur
cement
composition
waste
incinerator
fly
ash
bottom
including
contaminants
toxic
metal
salts
commonly
found
refuse
glass
fibers
improve
tensile
strength
concentration
anhydrous
sodium
sulfide
reduce
solubility
preferably
combining
substantially
molten
calcium
hydroxide
heated
double-planetary
orbital
mixer
preheated
135
degree
remaining
dry
components
added
homogeneity
homogeneous
mixture
poured
extruded
suitable
mold
allowed
cool
hardens
immobilizing
toxic metal
glass fibers
cement composition
radioactive contaminants
sodium hydroxide
mixed waste
mixed wastes
metal salts
fly ash
metal salt
tensile strength
calcium hydroxide
glass fiber
substantially dry
sodium sulfide
molten mixture
including radioactive
combining substantially
encapsulating radioactive
radioactive contaminant
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