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Title: 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)

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

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Related Subjects

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