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Title: | Transformation of Cs-exchanged clinoptilolite to CsAlSi<inf>5</inf>O<inf>12</inf> by hot-pressing | Authors: | Omerašević, Mia Ružić, Jovana Nedić Vasiljević, Bojana Baščarević, Zvezdana Bučevac, Dušan Orlić, Jovana Matović, Ljiljana |
Keywords: | CAS phase;Clinoptilolite;Cs disposal;Hot-pressing;Ion exchange | Issue Date: | 1-Nov-2017 | Journal: | Ceramics International | Abstract: | Dense CsAlSi5O12 was successfully obtained by hot pressing of Cs-exchanged clinoptilolite at 900 °C. Simultaneous application of high temperature and mechanical pressure allowed formation of CsAlSi5O12 at temperature considerably lower than 1150 °C which was the lowest reported temperature of CsAlSi5O12 formation in pressureless sintered Cs-exchanged clinoptilolite. CsAlSi5O12 formation was preceded by complete amorphisation of Cs-exchanged clinoptilolite in temperature range between 700 and 900 °C. Bearing in mind that clinoptilolite possesses high affinity for Cs cation it is believed that hot pressing of Cs-exchanged clinoptilolite might be an efficient way to immobilize radioactive Cs by its incorporation into crystal lattice of stable CsAlSi5O12. The samples sintered at 950 °C had relative density about 84% of theoretical density and open porosity of only 6% which is expected to result in low Cs leaching rate. |
URI: | https://dspace.ffh.bg.ac.rs/handle/123456789/745 | ISSN: | 0272-8842 | DOI: | 10.1016/j.ceramint.2017.07.055 |
Appears in Collections: | Journal Article |
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