Effects of Sodium Hydroxide and Sodium Aluminate on the Precipitation of Aluminum Containing Species in Tank Wastes
Aluminisilicate deposit buildup experienced during the tank waste volume-reduction process at the Savannah River Site (SRS) required an evaporator to be shut down. Studies were conducted at 80°C to identify the insoluble aluminosilicate phase(s) and to determine the kinetics of their formation and transformation. These tests were carried out under conditions more similar to those that occur in HLW tanks and evaporators. Comparison of our results with those reported from the site show very similar trends. Initially, an amorphous phase precipitates followed by a zeolite phase that transforms to sodalite and which finally converts to cancrinite. Our results also show the expected trend of an increased rate of transformation into denser aluminosilicate phases (sodalite and cancrinite) with time and increasing hydroxide concentrations.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 917219
- Report Number(s):
- PNNL-SA-51250; 2418; KP1302000; TRN: US0804459
- Resource Relation:
- Journal Volume: 943; Related Information: Nuclear Waste Management: Accomplishments of the Environmental Management Science Program, ACS Symposium Series, 943:319 - 335
- Country of Publication:
- United States
- Language:
- English
Similar Records
Precipitation of Aluminum Containing Species in Tank Wastes
Precipitation of Scale-Forming Species During Processing of High-Level Wastes
Related Subjects
CATALYTIC EFFECTS
SODIUM HYDROXIDES
PRECIPITATION
RADIOACTIVE WASTES
LIQUID WASTES
ALUMINIUM SILICATES
EVAPORATORS
FOULING
PHASE STUDIES
Aluminosilicates
cancrinite
sodalite
scale formation
Environmental Molecular Sciences Laboratory