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

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.
Inventors:
Issue Date:
OSTI Identifier:
7110824
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; EDB-94-128665
Patent Number(s):
US 5340506; A
Application Number:
PPN: US 7-943624
Contract Number:
W-31109-ENG-38
Resource Relation:
Patent File Date: 11 Sep 1992
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; BARIUM CHLORIDES; WASTE PROCESSING; CESIUM CHLORIDES; RADIOACTIVE WASTE PROCESSING; STRONTIUM CHLORIDES; WASTE FORMS; CHEMICAL PREPARATION; LEACHING; REACTION INTERMEDIATES; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; CESIUM COMPOUNDS; CHLORIDES; CHLORINE COMPOUNDS; DISSOLUTION; HALIDES; HALOGEN COMPOUNDS; MANAGEMENT; PROCESSING; RADIOACTIVE WASTE MANAGEMENT; SEPARATION PROCESSES; STRONTIUM COMPOUNDS; SYNTHESIS; WASTE MANAGEMENT; 052001* - Nuclear Fuels- Waste Processing