Characterization of UOP IONSIV IE-911
As a participating national lab in the inter-institutional effort to resolve performance issues of the non-elutable ion exchange technology for Cs extraction, they have carried out a series of characterization studies of UOP IONSIV{reg_sign} IE-911 and its component parts. IE-911 is a bound form (zirconium hydroxide-binder) of crystalline silicotitanate (CST) ion exchanger. The crystalline silicotitanate removes Cs from solutions by selective ion exchange. The performance issues of primary concern are: (1) excessive Nb leaching and subsequent precipitation of column-plugging Nb-oxide material, and (2) precipitation of aluminosilicate on IE-911 pellet surfaces, which may be initiated by dissolution of Si from the IE-911, thus creating a supersaturated solution with respect to silica. In this work, they have identified and characterized Si- and Nb-oxide based impurity phases in IE-911, which are the most likely sources of leachable Si and Nb, respectively. Furthermore, they have determined the criteria and mechanism for removal from IE-911 of the Nb-based impurity phase that is responsible for the Nb-oxide column plugging incidents.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 791880
- Report Number(s):
- SAND2001-0999; TRN: US0200696
- Resource Relation:
- Other Information: PBD: 1 Jun 2001
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DISSOLUTION
ION EXCHANGE MATERIALS
LEACHING
PERFORMANCE
PRECIPITATION
REMOVAL
SILICON COMPOUNDS
TITANATES
ZIRCONIUM HYDROXIDES
CESIUM
ION EXCHANGE
NIOBIUM OXIDES
FLOW BLOCKAGE
ALUMINIUM SILICATES
PHASE STUDIES
RADIOACTIVE WASTE PROCESSING