CsAlSi/sub 5/O/sub 12/: a possible host for /sup 137/Cs immobilization

Technical Report · Wed Mar 31 00:00:00 EST 1982

DOI:https://doi.org/10.2172/5321483· OSTI ID:5321483

Adl, T.; Vance, E. R.

CsAlSi/sub 5/O/sub 12/ exhibits more acid resistance than pollucite (CsAlSi/sub 2/O/sub 6/). At pH values of 1.02 and 1.40, the extraction of Cs from CsAlSi/sub 5/O/sub 12/ at 25/sup 0/C was approximately proportional to the square root of leach time. The Cs extraction at 25/sup 0/C varied as (H/sup +/)/sup 0/ /sup 36/ over the pH range of 1 to 6. Also, the Cs extraction in various brines at 300/sup 0/C/30 MPa was comparable with that for pollucite. CsAlSi/sub 5/O/sub 12/ can be crystallized at about 1000/sup 0/C from calcines if a small amount of CaO is present, but in the absence of such sintering acids, crystallization temperatures of about 1400/sup 0/C are necessary. Compatibility data were also obtained with respect to several other phases with which CsAlSi/sub 5/O/sub 12/ might be expected to coexist in tailored ceramics designed for high-level defense waste.

• Research Organization: Rockwell International Corp., Canoga Park, CA (United States). Energy Systems Group; Pennsylvania State Univ., University Park (USA). Materials Research Lab.
• DOE Contract Number: AC09-79ET41900
• OSTI ID: 5321483
• Report Number(s): DOE/ET/41900-14; ESG-DOE-13369; ON: DE82013246; TRN: 82-013553
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ALUMINIUM SILICATES
CRYSTALLIZATION
LEACHING
CESIUM 137
CESIUM SILICATES
RADIOACTIVE WASTE PROCESSING
SOLIDIFICATION
BRINES
CALCIUM OXIDES
CERAMICS
EXPERIMENTAL DATA
HIGH PRESSURE
HIGH TEMPERATURE
MEDIUM TEMPERATURE
PH VALUE
PRESSURE DEPENDENCE
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
ALKALI METAL COMPOUNDS
ALKALI METAL ISOTOPES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALCIUM COMPOUNDS
CESIUM COMPOUNDS
CESIUM ISOTOPES
CHALCOGENIDES
DATA
DISSOLUTION
INFORMATION
ISOTOPES
MANAGEMENT
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PROCESSING
RADIOISOTOPES
SEPARATION PROCESSES
SILICATES
SILICON COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
YEARS LIVING RADIOISOTOPES
360205* - Ceramics
Cermets
& Refractories- Corrosion & Erosion
052001 - Nuclear Fuels- Waste Processing
360201 - Ceramics
Cermets
& Refractories- Preparation & Fabrication