Method for solidifying aqueous radioactive wastes for noncontaminating storage
Method for solidifying high and medium radioactivity and/or actinide containing aqueous waste concentrates or fine-grained solid wastes suspended in water for final noncontaminating storage. The waste concentrates or suspensions are set, by evaporation, to a water content in the range between 40 and 80 percent by weight, and a solid content whose metal ion and/or metal oxide component lies between 10 and 30 percent by weight of the evaporate being formed. The ph of the evaporate is set to between 5 and 10. The resulting evaporate is then pelletized with the aid of a clay-like substance. The pellets are then heat treated, including drying at temperatures between room temperature and about 150/sup 0/C., then calcining at room temperatures up to about 800/sup 0/C. And subsequently firing at temperatures between 800/sup 0/C. And 1400/sup 0/C. To form practically undissolvable mineral phases. The pellets are then enclosed on all sides in a dense, continuous ceramic or metallic matrix.
- Assignee:
- Kernforschungszentrum Karlsruhe Gmbh (Germany, Federal Republic Of)
- Patent Number(s):
- US 4354954
- Application Number:
- TRN: 83-000081
- OSTI ID:
- 6682720
- Resource Relation:
- Patent Priority Date: Priority date 29 Apr 1978, Germany, Federal Republic of (F.R. Germany); Other Information: PAT-APPL-034534
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
RADIOACTIVE WASTE PROCESSING
ALPHA-BEARING WASTES
HIGH-LEVEL RADIOACTIVE WASTES
INTERMEDIATE-LEVEL RADIOACTIVE WASTES
SOLIDIFICATION
ACTINIDES
ALLOYS
AQUEOUS SOLUTIONS
CERAMICS
CLAYS
EVAPORATION
HEAT TREATMENTS
MATRICES
PELLETIZING
PELLETS
PH VALUE
RADIOACTIVE WASTE STORAGE
SUSPENSIONS
DISPERSIONS
ELEMENTS
FABRICATION
MANAGEMENT
MATERIALS
METALS
MIXTURES
MOLDING
PHASE TRANSFORMATIONS
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
SOLUTIONS
STORAGE
WASTE MANAGEMENT
WASTE PROCESSING
WASTE STORAGE
WASTES
052001* - Nuclear Fuels- Waste Processing