Microstructure and mineral chemistry of Synroc-d

Journal Article · Thu Sep 01 04:00:00 EDT 1983 · J. Am. Ceram. Soc.; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1983.tb10611.x· OSTI ID:6319142

Ryerson, F J

Synroc-D is a polyphase nuclear waste ceramic optimally consisting of zirconolite, perovskite, an ulvospinel-rich solid solution, a hercynitic spinel solid solution, and nepheline. A continuous intergranular glass phase is also present, which may aid in densification, but decreases the waste form's durability in aqueous environments, as does the presence of nepheline. The major radionuclides are distributed in the following manner: Uranium is immobilized in zirconolite and perovskite, the lanthanides and strontium are immobilized in perovskite, cesium is distributed between nepheline and glass. The partitioning of tetravalent uranium and trivalent actinides may prove useful as surrogates for tetravalent and trivalent actinides, respectively. The spinels are free of radionuclides and provide a degree of microencapsulation for the radionuclide-bearing phases. Values of mineral-mineral partition coefficients are largely dependent on powder preparation; the choice of zirconia reagent is of particular importance.

• Research Organization: Department of Earth Sciences, Lawrence Livermore National Laboratory, Livermore, California
• OSTI ID: 6319142
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 66:9; ISSN JACTA
• 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
ACTINIDE COMPOUNDS
ACTINIDES
ALKALI METALS
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CERAMICS
CESIUM
CHALCOGENIDES
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
DISTRIBUTION
ELEMENTS
ENCAPSULATION
GLASS
IRON COMPOUNDS
IRON OXIDES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MANAGEMENT
MATERIALS
METALS
MICROSTRUCTURE
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTITION
PEROVSKITE
PEROVSKITES
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE PROCESSING
RADIOACTIVE WASTES
RARE EARTHS
ROCKS
SILICON COMPOUNDS
SILICON OXIDES
SPINELS
STRONTIUM
SYNROC PROCESS
SYNTHETIC MATERIALS
SYNTHETIC ROCKS
THORIUM COMPOUNDS
THORIUM OXIDES
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
URANIUM
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
ZIRCONOLITE