Processing effects on the behavior of titanate waste forms in aqueous solution

Technical Report · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6088673

Dosch, R G

Titanate processing parameters including temperature, waste loading, redox conditions, and additives used to promote specific phases were evaluated with respect to their effect on leaching of Cs, Mo, Ca, Sr, Ba, U, Gd, and Ti in the range of 22/sup 0/ to 150/sup 0/C in leachates which included deionized water, acidic (pH 2), and basic (pH 12) solutions. Surface analyses and microstructural characterization were used to relate observed leaching behavior to processing parameters. Redox conditions were found to be very important with respect to Cs (and Mo) retention. Two Cs-bearing phases were found in titanate prepared under oxidizing conditions. One had a hollandite structure and the other contained Cs, Mo, Ca, and Fe as major constituents. The latter phase, which was more susceptible to leaching, was not observed in titanates prepared using adequate reducing conditions. Where applicable, a reference glass (PNL 67-68) was included in the leaching tests. Comparative leach rates for elements common to both waste forms were generally one to four orders of magnitude lower for titanates within the range of conditions used.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6088673
• Report Number(s): SAND-81-1423C; ON: DE82001907
• 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
36 MATERIALS SCIENCE
360604 -- Materials-- Corrosion
Erosion
& Degradation
ADDITIVES
ALKALI METALS
ALKALINE EARTH METALS
AQUEOUS SOLUTIONS
BARIUM
CALCIUM
CESIUM
CHEMICAL ANALYSIS
COMPARATIVE EVALUATIONS
DATA
DISPERSIONS
DISSOLUTION
ELECTRON MICROPROBE ANALYSIS
ELECTRON MICROSCOPY
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
GADOLINIUM
GLASS
HIGH TEMPERATURE
HIGH-LEVEL RADIOACTIVE WASTES
HOT PRESSING
INFORMATION
LEACHING
MANAGEMENT
MATERIALS
MATERIALS WORKING
MEDIUM TEMPERATURE
METALS
MICROANALYSIS
MICROSCOPY
MIXTURES
MOLYBDENUM
NUMERICAL DATA
OXYGEN COMPOUNDS
PH VALUE
PHASE TRANSFORMATIONS
PRESSING
PROCESSING
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE PROCESSING
RADIOACTIVE WASTES
RARE EARTHS
REFRACTORY METALS
SCANNING ELECTRON MICROSCOPY
SEPARATION PROCESSES
SIMULATION
SOLIDIFICATION
SOLUTIONS
STRONTIUM
TEMPERATURE EFFECTS
TITANATES
TITANIUM
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES