Electron microprobe analyses of selected samples from deep rock disposal experiment No. 1. [Study on interaction between molten, glass-based, nuclear waste simulant and rock]
Deep Rock Disposal Experiment No. 1 was designed to provide information about the interaction between a molten, glass-based, nuclear waste simulant and rock material. Selected samples from this experiment were examined by optical microscopy and electron probe microanalysis. Analysis of the homogenized material in the convection cell that was created in the central portion of the melt region shows that an amount of rock equal to about one-half of the original amount of waste simulant was incorporated in the melt during the experiment. Stagnant melt at the sides of the cell formed a glass with large compositional gradients. A white band separated the convected and stagnant materials. The color of the band is attributed to light scattering by small crystallites formed during cooling. Four types of crystallites grew from the melt: two oxides, a Mg--Fe borate, and a silicate. Spinel (MgO, Cr/sub 2/O/sub 3/, FeO (Fe/sub 2/O/sub 3/), and NiO) was the most common crystallite in the glass. The spinel crystallites found within the convection cell displayed skeletal morphology and oscillatory zoning which indicates growth at varying temperatures as they were carried along by convection. A single cluster of nonskeletal (Fe,Cr)/sub 2/O/sub 3/ crystallites was found at the bottom of the melt zone where convection did not occur. Mg--Fe borate crystallites grew in clusters in the central portion of the convection cell after convection ceased. A silicate similar to Fe-rich diopside (CaMgSi/sub 2/O/sub 6/) with unusual amounts of Ce/sub 2/O/sub 3/ and other heavy metal oxides formed as larger crystallites in the stagnant melt at the side of the convection cell and as many very small crystallites in the white band.
- Research Organization:
- Sandia Labs., Albuquerque, N.Mex. (USA)
- DOE Contract Number:
- AT(29-1)-789
- OSTI ID:
- 7361996
- Report Number(s):
- SAND-76-0153; TRN: 04-016888
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
RADIOACTIVE WASTE DISPOSAL
RESEARCH PROGRAMS
ROCKS
MELTING
BORATES
COLOR
CRYSTALS
DIAGRAMS
ELECTRON MICROPROBE ANALYSIS
GLASS
IMAGES
IRON COMPOUNDS
MAGNESIUM COMPOUNDS
OPTICAL MICROSCOPY
PHOTOMICROGRAPHY
SILICATES
SOLID WASTES
SPINELS
TABLES
UNDERGROUND DISPOSAL
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
INFORMATION
MAGNESIUM OXIDES
MANAGEMENT
MICROANALYSIS
MICROSCOPY
MINERALS
OPTICAL PROPERTIES
ORGANOLEPTIC PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHOTOGRAPHY
PHYSICAL PROPERTIES
SILICON COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
052002* - Nuclear Fuels- Waste Disposal & Storage
400102 - Chemical & Spectral Procedures