Method for solidifying aqueous radioactive wastes for noncontaminating storage

Patent · Tue Oct 19 04:00:00 EDT 1982

OSTI ID:6682720

Koster, R; Riege, U; Scheffler, K

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
• OSTI ID: 6682720
• 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
ACTINIDES
ALLOYS
ALPHA-BEARING WASTES
AQUEOUS SOLUTIONS
CERAMICS
CLAYS
DISPERSIONS
ELEMENTS
EVAPORATION
FABRICATION
HEAT TREATMENTS
HIGH-LEVEL RADIOACTIVE WASTES
INTERMEDIATE-LEVEL RADIOACTIVE WASTES
MANAGEMENT
MATERIALS
MATRICES
METALS
MIXTURES
MOLDING
PELLETIZING
PELLETS
PH VALUE
PHASE TRANSFORMATIONS
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE PROCESSING
RADIOACTIVE WASTE STORAGE
RADIOACTIVE WASTES
SOLIDIFICATION
SOLUTIONS
STORAGE
SUSPENSIONS
WASTE MANAGEMENT
WASTE PROCESSING
WASTE STORAGE
WASTES