Method for solidifying aqueous radioactive wastes for non-contaminating 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 evaporate is kneaded with a clay-like substance containing a small quantity of cement or such a claylike substance or mixture of a clay-like substance with a small quantity of cement containing an additive for suppressing the volatility of the alkalis or alkali earths and/or an additive for suppressing the volatility of any decomposing anions which may be present in the evaporate from the group including sulfate, phosphate, molybdate and uranate ions. The kneading occurs at a weight ratio range of evaporate to clay-like substance of 1:1 to 2:1. Molded bodies are produced from the resulting kneaded mass the molded bodies are then heat treated including drying at temperatures between room temperature and about 150/sup 0/C., calcining at 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 molded bodies of fired mineral phases are enclosed on all sides in a dense, continuous ceramic or metallic matrix.
- Assignee:
- Kernforschungszentrum Karlsruhe Gmbh (Germany, Federal Republic Of)
- Patent Number(s):
- US 4297304
- OSTI ID:
- 5994406
- Resource Relation:
- Patent Priority Date: Priority date 10 Jun 1977, German, Federal Republic of (F.R. Germany)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
RADIOACTIVE WASTE PROCESSING
HIGH-LEVEL RADIOACTIVE WASTES
INTERMEDIATE-LEVEL RADIOACTIVE WASTES
SOLIDIFICATION
ACTINIDES
ADDITIVES
AQUEOUS SOLUTIONS
CALCINATION
CEMENTS
DRYING
EVAPORATION
HEATING
MIXING
MOLDING
PH VALUE
RADIOACTIVE WASTE STORAGE
BUILDING MATERIALS
CHEMICAL REACTIONS
DECOMPOSITION
DISPERSIONS
ELEMENTS
FABRICATION
MANAGEMENT
MATERIALS
METALS
MIXTURES
PHASE TRANSFORMATIONS
PROCESSING
PYROLYSIS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
SOLUTIONS
STORAGE
THERMOCHEMICAL PROCESSES
WASTE MANAGEMENT
WASTE PROCESSING
WASTE STORAGE
WASTES
052001* - Nuclear Fuels- Waste Processing