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Method for solidification of radioactive and other hazardous waste

Patent ·
OSTI ID:874845
 [1];  [1];  [1];  [2];  [1];  [2];  [2];  [1];  [3];  [3];  [4];  [4];  [4]
  1. Krasnoyarsk, RU
  2. Zheleznogorsk, RU
  3. Saint-Petersburg, RU
  4. Idaho Falls, ID
+ Show Author Affiliations

Solidification of liquid radioactive waste, and other hazardous wastes, is accomplished by the method of the invention by incorporating the waste into a porous glass crystalline molded block. The porous block is first loaded with the liquid waste and then dehydrated and exposed to thermal treatment at 50-1,000.degree. C. The porous glass crystalline molded block consists of glass crystalline hollow microspheres separated from fly ash (cenospheres), resulting from incineration of fossil plant coals. In a preferred embodiment, the porous glass crystalline blocks are formed from perforated cenospheres of grain size -400+50, wherein the selected cenospheres are consolidated into the porous molded block with a binder, such as liquid silicate glass. The porous blocks are then subjected to repeated cycles of saturating with liquid waste, and drying, and after the last cycle the blocks are subjected to calcination to transform the dried salts to more stable oxides. Radioactive liquid waste can be further stabilized in the porous blocks by coating the internal surface of the block with metal oxides prior to adding the liquid waste, and by coating the outside of the block with a low-melting glass or a ceramic after the waste is loaded into the block.

Research Organization:
BECHTEL BWXT IDAHO LLC
DOE Contract Number:
AC07-99ID13727
Assignee:
The United States of America as represented by the Department of Energy (Washington, DC)
Patent Number(s):
US 6472579
OSTI ID:
874845
Country of Publication:
United States
Language:
English

References (6)

The study of composition of novel high temperature catalysts for oxidative conversion of methane journal July 1998
The polymorphism of some rare earth oxides and their reaction with water journal May 1964
Development and Testing of a New Porous Crystalline Matrix (Gubka) for Stabilizing Actinide Solutions journal January 1999
The possibilities of237Np and241Am disposal by transmutation in their irradiation with thermal neutrons in porous immobilizing agents journal March 1991
Novel microdesign of oxidation catalysts. Part 1. Glass crystal microspheres as new catalysts for the oxidative conversion of methane journal July 1998
Novel microdesign of oxidation catalysts. Part 2. The influence of fluorination on the catalytic properties of glass crystal microspheres journal July 1998

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Related Subjects

-40050
/588/
50-1000degree
accomplished
adding
ash
binder
block
blocks
calcination
cenospheres
ceramic
coals
coating
consists
consolidated
crystalline
cycle
cycles
dehydrated
dried
drying
embodiment
exposed
fly
fly ash
formed
fossil
glass
grain
grain size
hazardous
hollow
incineration
incorporating
internal
liquid
liquid radioactive
loaded
low-melting
metal
metal oxide
method
microspheres
molded
outside
oxides
perforated
plant
porous
porous glass
prior
radioactive
radioactive waste
repeated
resulting
salts
saturating
selected
separated
silicate
size
solidification
stabilized
stable
subjected
surface
thermal
thermal treatment
transform
treatment
waste
wastes