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

Patent · Tue Aug 23 04:00:00 EDT 1994

OSTI ID:7110824

Koyama, Tadafumi

A method is described 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.

• DOE Contract Number: W-31109-ENG-38
• Assignee: Dept. of Energy, Washington, DC (United States)
• Patent Number(s): US 5340506; A
• Application Number: PPN: US 7-943624
• OSTI ID: 7110824
• Country of Publication: United States
• Language: English

Related Subjects

052001* -- Nuclear Fuels-- Waste Processing
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
BARIUM CHLORIDES
BARIUM COMPOUNDS
CESIUM CHLORIDES
CESIUM COMPOUNDS
CHEMICAL PREPARATION
CHLORIDES
CHLORINE COMPOUNDS
DISSOLUTION
HALIDES
HALOGEN COMPOUNDS
LEACHING
MANAGEMENT
PROCESSING
RADIOACTIVE WASTE MANAGEMENT
RADIOACTIVE WASTE PROCESSING
REACTION INTERMEDIATES
SEPARATION PROCESSES
STRONTIUM CHLORIDES
STRONTIUM COMPOUNDS
SYNTHESIS
WASTE FORMS
WASTE MANAGEMENT
WASTE PROCESSING