Leach resistance properties and release processes for salt-occluded zeolite A
The pyrometallurgical processing of spent fuel from the Integral Fast Reactor (IFR) results in a waste of LiCl-KCl-NaCl salt containing approximately 10 wt% fission products, primarily CsCl and SrCl[sub 2]. For disposal, this waste must be immobilized in a form that it is leach resistant. A salt-occluded zeolite has been identified as a potential waste form for the salt. Its leach resistance properties were investigated using powdered samples. The results were that strontium was not released and cesium had a low release, 0.056 g/m[sup 2] for the 56 day leach test. The initial release (within 7 days) of alkali metal cations was rapid and subsequent releases were much smaller. The releases of aluminum and silicon were 0.036 and 0.028 g/m[sup 2], respectively, and were constant. Neither alkali metal cation hydrolysis nor exchange between cations in the leachate and those in the zeolite was significant. Only sodium release followed t[sup 0.5] kinetics. Selected dissolution of the occluded salt was the primary release process. These results confirm that salt-occluded zeolite has promise as the waste form for IFR pyroprocess salt.
- Research Organization:
- Argonne National Lab., IL (United States). Chemical Technology Div.
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 6896428
- Report Number(s):
- ANL/CMT/CP-77755; CONF-921101-30; ON: DE93005573
- Resource Relation:
- Conference: 16. Material Research Society international symposium on the scientific basis for nuclear waste management fall meeting, Boston, MA (United States), 30 Nov - 5 Dec 1992
- Country of Publication:
- United States
- Language:
- English
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36 MATERIALS SCIENCE
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
IFR REACTOR
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WASTE FORMS
LEACHING
ZEOLITES
FISSION PRODUCTS
PYROCHEMICAL REPROCESSING
SALTS
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EPITHERMAL REACTORS
EXPERIMENTAL REACTORS
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ISOTOPES
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MINERALS
RADIOACTIVE MATERIALS
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SEPARATION PROCESSES
SILICATE MINERALS
ZERO POWER REACTORS
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050800 - Nuclear Fuels- Spent Fuels Reprocessing
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