Method to synthesize dense crystallized sodalite pellet for immobilizing halide salt radioactive waste

Patent · Sat Jan 01 04:00:00 EST 1994

OSTI ID:869459

Koyama, Tadafumi ^[1]

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1. Tokyo, JP

A method for immobilizing waste chloride salts containing radionuclides such as cesium and strontium and hazardous materials such as barium. A sodalite intermediate is prepared by mixing appropriate amounts of silica, alumina and sodium hydroxide with respect to sodalite and heating the mixture to form the sodalite intermediate and water. Heating is continued to drive off the water to form a water-free intermediate. The water-free intermediate is mixed with either waste salt or waste salt which has been contacted with zeolite to concentrate the radionuclides and hazardous material. The waste salt-intermediate mixture is then compacted and heated under conditions of heat and pressure to form sodalite with the waste salt, radionuclides and hazardous material trapped within the sodalite cage structure. This provides a final product having excellent leach resistant capabilities.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL
• DOE Contract Number: W-31109-ENG-38
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5340506
• OSTI ID: 869459
• Country of Publication: United States
• Language: English

Related Subjects

/588/210/423/502/
alumina
amounts
appropriate
barium
cage
capabilities
cesium
chloride
chloride salt
chloride salts
compacted
concentrate
conditions
contacted
containing
containing radionuclides
continued
crystallized
dense
drive
excellent
final
final product
form
halide
halide salt
hazardous
hazardous material
hazardous materials
heat
heated
heating
hydroxide
immobilizing
immobilizing waste
intermediate
leach
leach resistant
material
materials
method
mixed
mixing
mixture
pellet
prepared
pressure
product
provides
radioactive
radioactive waste
radionuclides
resistant
respect
salt
salt-intermediate
salts
salts containing
silica
sodalite
sodium
sodium hydroxide
strontium
structure
synthesize
trapped
waste
waste chloride
water
water-free
zeolite