Removal of Cs ions from aqueous solutions by using matrices of natural clinoptilolite and its safe disposal

The possibility to use natural zeolite - clinoptilolite as a host material for radioactive Cs immobilization has been investigated. Cs-exchanged form of clinoptilolite which was prepared by treatment of clinoptilolite powder with 0.25 M CsCl solution was compacted. Both, powder and powder compact of...

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Published inScience of sintering Vol. 48; no. 1; pp. 101 - 107
Main Authors Omerasevic, Mia, Ruzic, Jovana, Vukovic, Nikola, Jovanovic, Uros, Mirkovic, Miljana, Maksimovic, Vesna, Dondur, Vera
Format Journal Article
LanguageEnglish
Published International Institute for the Science of Sintering, Beograd 2016
Subjects
clinoptilolite
Cs disposal
ion exchange
leaching tests
sintering
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Summary:The possibility to use natural zeolite - clinoptilolite as a host material for radioactive Cs immobilization has been investigated. Cs-exchanged form of clinoptilolite which was prepared by treatment of clinoptilolite powder with 0.25 M CsCl solution was compacted. Both, powder and powder compact of exchanged clinoptilolite were thermally treated at 1200?C. The XRPD analysis showed that Cs was successfully immobilized after heat treatment by formation of stable cesium dodecaoxo-alumopentasilicate in both, powder sample and compact. The newly formed compound showed satisfactory Cs ions retention during leaching test. The sintered compact showed somewhat better resistance to Cs leaching than the thermally treated powder. The compressive strength of sintered compact was close to 200 MPa which is more than enough for easy handling and safe storage.
ISSN:0350-820X
1820-7413
DOI:10.2298/SOS1601101O