Leach testing of waste glasses under near-saturation conditions

Journal Article · Sun Jan 01 04:00:00 EST 1984 · Mater. Res. Soc. Symp. Proc.; (United States)

OSTI ID:5852418

Grambow, B; Strachan, D M

Two waste glasses, MCC 76-68 and C31-3, 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 76-68 and C31-3 glasses showed increased leaching in 0.001 M MgCl/sub 2/ upon removal of the layer. This suggests that the leaching mechanisms is a function of the difference in the silica chemical potential between the glass and the gel layer. 14 references, 7 figures, 2 tables.

• Research Organization: Hahn-Meitner Institut fuer Kernforschung Berlin GmbH, West Germany
• OSTI ID: 5852418
• Journal Information: Mater. Res. Soc. Symp. Proc.; (United States), Journal Name: Mater. Res. Soc. Symp. Proc.; (United States) Vol. 26; ISSN MRSPD
• Country of Publication: United States
• Language: English

Related Subjects

052002* -- Nuclear Fuels-- Waste Disposal & Storage
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
CHLORIDES
CHLORINE COMPOUNDS
DATA
DISPERSIONS
DISSOLUTION
EXPERIMENTAL DATA
GLASS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
LEACHING
MAGNESIUM CHLORIDES
MAGNESIUM COMPOUNDS
MATERIALS
MIXTURES
NUMERICAL DATA
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTES
SEPARATION PROCESSES
SOLIDIFICATION
SOLUTIONS
WASTES
WATER