Phase equilibria, leaching characteristics and ceramic processing of SYNROC D formulations for US defense wastes

Conference · Tue Jan 01 04:00:00 EST 1980

OSTI ID:6892185

Newkirk, H; Ryerson, F; Coles, D; Hoenig, C; Rozsa, R; Rossington, C; Bazan, F; Tewhey, J

The assemblage of coexisting phases in SYNROC D is perovskite, zirconolite, nepheline and spinel. Cesium from the supernate is to be immobilized in hollandite. In the current processing scheme, presynthesized granules of hollandite are added to calcined SYNROC D powders prior to hot procesing or sintering. The disposition of inert and radwaste components of Savannah River Plant (SRP) wastes in SYNROC D formulations has been determined by means of optical microscopy, XRD, XRF, SEM, STEM, electron microprobe analysis and autoradiography. A summary of results is presented. Leaching studies of SYNROC D have been done by means of static, high temperature experiments and continuous-flow experiments. The data reported are from high-temperature experiments (distilled water, powdered sample, 150/sup 0/C, one day). The elements reported are the only ones observed in the leachate. Analysis was done by means of XRF. The flowsheet which depicts the current experimental methods that are being employed at LLNL to produce SYNROC D samples containing presynthesized Cs-bearing hollandite is presented. The starting material for SYNROC D (high Fe, high Al and composite compositions) is simulated sludge obtained in 55 gallon quantities from Southwestern Chemical Corporation. Hot pressing temperatures for SYNROC D are 1000 to 1150/sup 0/C. Hot pressing temperatures for hollandite are 1200 to 1400/sup 0/C.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore National Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6892185
• Report Number(s): UCRL-85483; CONF-801124-45
• Country of Publication: United States
• Language: English

Related Subjects

052001* -- Nuclear Fuels-- Waste Processing
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
CHEMICAL ANALYSIS
DIAGRAMS
DISSOLUTION
ELECTRON MICROPROBE ANALYSIS
FABRICATION
FLOWSHEETS
HIGH TEMPERATURE
HIGH-LEVEL RADIOACTIVE WASTES
HOT PRESSING
HYDROGEN COMPOUNDS
LEACHING
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MANAGEMENT
MATERIALS
MATERIALS WORKING
MICROANALYSIS
MICROSCOPY
MINERALS
OPTICAL MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHASE STUDIES
POLLUTANTS
PRESSING
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE PROCESSING
RADIOACTIVE WASTES
SEPARATION PROCESSES
SOLID WASTES
SPINELS
SYNROC PROCESS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
WATER