Leach testing of waste glasses under near-saturation conditions
Two waste glasses, MCC 76 to 68 and C31 to 3, were leached in deionized water and 0.001 M MgCl/sub 2/ for periods up to 158 days. At 57 days the gel layer was removed from some of the specimens and leaching continued for up to 100 days. Results from leaching in deionized water showed that the gel layer was not protective. Results from leaching in 0.001 M MgCl/sub 2/ are in good agreement with the predicted results obtained from the use of the PHREEQE geochemical code and with sepiolite (Mg/sub 2/Si/sub 3/O/sub 6/(OH)/sub 4/) as the Mg-bearing precipitate. Both B and Si were predicted and observed to increase with increasing glass dissolution while maintaining sepiolite solubility. Both MCC 76 to 68 and C31 to 3 glasses showed increased leaching in 0.001 M MgCl/sub 2/ upon removal of the layer. This suggests a leaching mechanism whereby leaching is driven by the formation of an alteration product.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA); Hahn-Meitner-Institut fuer Kernforschung Berlin G.m.b.H. (Germany, F.R.)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5557423
- Report Number(s):
- PNL-SA-11554; CONF-831174-20; ON: DE84003353
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
360604* -- Materials-- Corrosion
Erosion
& Degradation
ALKALINE EARTH METAL COMPOUNDS
BOROSILICATE GLASS
CHLORIDES
CHLORINE COMPOUNDS
DATA
DISSOLUTION
EXPERIMENTAL DATA
GLASS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
LEACHING
MAGNESIUM CHLORIDES
MAGNESIUM COMPOUNDS
NUMERICAL DATA
OXYGEN COMPOUNDS
SEPARATION PROCESSES
WATER