Zirconolite Matrices for the Immobilization of REE–Actinide Wastes
The structural and chemical properties of zirconolite (ideally CaZrTi<sub>2</sub>O<sub>7</sub>) as a host phase for separated REE–actinide-rich wastes are considered. Detailed analysis of both natural and synthetic zirconolite-structured phases confirms that a selection of zi...
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| Format: | Article |
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MDPI AG
2023-07-01
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| Series: | Ceramics |
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| Online Access: | https://www.mdpi.com/2571-6131/6/3/98 |
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| author | Sergey V. Yudintsev Maximilian S. Nickolsky Michael I. Ojovan Olga I. Stefanovsky Victor I. Malkovsky Amina S. Ulanova Lewis R. Blackburn |
| author_facet | Sergey V. Yudintsev Maximilian S. Nickolsky Michael I. Ojovan Olga I. Stefanovsky Victor I. Malkovsky Amina S. Ulanova Lewis R. Blackburn |
| author_sort | Sergey V. Yudintsev |
| collection | DOAJ |
| description | The structural and chemical properties of zirconolite (ideally CaZrTi<sub>2</sub>O<sub>7</sub>) as a host phase for separated REE–actinide-rich wastes are considered. Detailed analysis of both natural and synthetic zirconolite-structured phases confirms that a selection of zirconolite polytype structures may be obtained, determined by the provenance, crystal chemistry, and/or synthesis route. The production of zirconolite ceramic and glass–ceramic composites at an industrial scale appears most feasible by cold pressing and sintering (CPS), pressure-assisted sintering techniques such as hot isostatic pressing (HIP), or a melt crystallization route. Moreover, we discuss the synthesis of zirconolite glass ceramics by the crystallization of B–Si–Ca–Zr–Ti glasses containing actinides in conditions of increased temperatures relevant to deep borehole disposal (DBD). |
| first_indexed | 2024-03-10T22:55:56Z |
| format | Article |
| id | doaj.art-0e31d9e3ff9e4cd5aaee9195a81c12ba |
| institution | Directory Open Access Journal |
| issn | 2571-6131 |
| language | English |
| last_indexed | 2024-03-10T22:55:56Z |
| publishDate | 2023-07-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Ceramics |
| spelling | doaj.art-0e31d9e3ff9e4cd5aaee9195a81c12ba2023-11-19T10:00:48ZengMDPI AGCeramics2571-61312023-07-01631573162210.3390/ceramics6030098Zirconolite Matrices for the Immobilization of REE–Actinide WastesSergey V. Yudintsev0Maximilian S. Nickolsky1Michael I. Ojovan2Olga I. Stefanovsky3Victor I. Malkovsky4Amina S. Ulanova5Lewis R. Blackburn6Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry of the Russian Academy of Sciences, Staromonetny Lane, 35, 119017 Moscow, RussiaInstitute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry of the Russian Academy of Sciences, Staromonetny Lane, 35, 119017 Moscow, RussiaInstitute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry of the Russian Academy of Sciences, Staromonetny Lane, 35, 119017 Moscow, RussiaA.N. Frumkin Institute of Physical Chemistry and Electrochemistry of the Russian Academy of Sciences, 119071 Moscow, RussiaInstitute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry of the Russian Academy of Sciences, Staromonetny Lane, 35, 119017 Moscow, RussiaInstitute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry of the Russian Academy of Sciences, Staromonetny Lane, 35, 119017 Moscow, RussiaImmobilisation Science Laboratory, Department of Materials Science and Engineering, University of Sheffield, Mappin Street, Sheffield S1 3JD, UKThe structural and chemical properties of zirconolite (ideally CaZrTi<sub>2</sub>O<sub>7</sub>) as a host phase for separated REE–actinide-rich wastes are considered. Detailed analysis of both natural and synthetic zirconolite-structured phases confirms that a selection of zirconolite polytype structures may be obtained, determined by the provenance, crystal chemistry, and/or synthesis route. The production of zirconolite ceramic and glass–ceramic composites at an industrial scale appears most feasible by cold pressing and sintering (CPS), pressure-assisted sintering techniques such as hot isostatic pressing (HIP), or a melt crystallization route. Moreover, we discuss the synthesis of zirconolite glass ceramics by the crystallization of B–Si–Ca–Zr–Ti glasses containing actinides in conditions of increased temperatures relevant to deep borehole disposal (DBD).https://www.mdpi.com/2571-6131/6/3/98highly radioactive wasteREE–actinide fractionimmobilizationzirconoliteceramicsglass ceramics |
| spellingShingle | Sergey V. Yudintsev Maximilian S. Nickolsky Michael I. Ojovan Olga I. Stefanovsky Victor I. Malkovsky Amina S. Ulanova Lewis R. Blackburn Zirconolite Matrices for the Immobilization of REE–Actinide Wastes Ceramics highly radioactive waste REE–actinide fraction immobilization zirconolite ceramics glass ceramics |
| title | Zirconolite Matrices for the Immobilization of REE–Actinide Wastes |
| title_full | Zirconolite Matrices for the Immobilization of REE–Actinide Wastes |
| title_fullStr | Zirconolite Matrices for the Immobilization of REE–Actinide Wastes |
| title_full_unstemmed | Zirconolite Matrices for the Immobilization of REE–Actinide Wastes |
| title_short | Zirconolite Matrices for the Immobilization of REE–Actinide Wastes |
| title_sort | zirconolite matrices for the immobilization of ree actinide wastes |
| topic | highly radioactive waste REE–actinide fraction immobilization zirconolite ceramics glass ceramics |
| url | https://www.mdpi.com/2571-6131/6/3/98 |
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