Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate Compound
The current work was aimed at developing a new conditioning method of spent electrolyte-radioactive waste (RW) generated during the pyrochemical reprocessing of mixed nitride uranium-plutonium spent nuclear fuel. Magnesium potassium phosphate (MPP) compound samples were synthesized under solidificat...
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2020-04-01
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| author | Svetlana A. Kulikova Kseniya Yu. Belova Ekaterina A. Tyupina Sergey E. Vinokurov |
| author_facet | Svetlana A. Kulikova Kseniya Yu. Belova Ekaterina A. Tyupina Sergey E. Vinokurov |
| author_sort | Svetlana A. Kulikova |
| collection | DOAJ |
| description | The current work was aimed at developing a new conditioning method of spent electrolyte-radioactive waste (RW) generated during the pyrochemical reprocessing of mixed nitride uranium-plutonium spent nuclear fuel. Magnesium potassium phosphate (MPP) compound samples were synthesized under solidification of the electrolyte surrogate solution in a LiCl-KCl-CsCl system. The phase composition and structure of obtained compounds were studied by XRD and SEM-EDS methods. It was found that the compounds possessed a high compressive strength of 17–26 MPa. Hydrolytic stability of the compounds was evaluated in accordance with the long semi-dynamic test GOST R 52126-2003 and with the static PCT test. The <sup>137</sup>Cs content in the leached solutions was determined by gamma-ray spectrometry, and other compound components were determined by ICP–AES and ICP–MS methods. The differential leaching rate of Cs at 25 °C from monolithic samples on the 91st day of samples contact with water was 5–11 × 10<sup>−5</sup> g/(cm<sup>2</sup>·day) (GOST R 52126-2003), and was 4–29 × 10<b><sup>−</sup></b><sup>7</sup> g/(cm<sup>2</sup>∙day) on the 7th day at 90 °C from crushed samples (PCT). The thermal stability of the compound at 180 °C and 450 °C was shown. The characteristics of the obtained MPP compound correspond to the current regulatory requirements for materials for RW conditioning. |
| first_indexed | 2024-03-10T20:26:02Z |
| format | Article |
| id | doaj.art-4bbd55e3d6704e47a69286644d6486ce |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T20:26:02Z |
| publishDate | 2020-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-4bbd55e3d6704e47a69286644d6486ce2023-11-19T21:48:00ZengMDPI AGEnergies1996-10732020-04-01138196310.3390/en13081963Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate CompoundSvetlana A. Kulikova0Kseniya Yu. Belova1Ekaterina A. Tyupina2Sergey E. Vinokurov3Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 Kosygin st., 119991 Moscow, RussiaVernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 Kosygin st., 119991 Moscow, RussiaDepartment of High Energy Chemistry and Radioecology, D. Mendeleev University of Chemical Technology of Russia (MUCTR), 125480 Moscow, RussiaVernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 19 Kosygin st., 119991 Moscow, RussiaThe current work was aimed at developing a new conditioning method of spent electrolyte-radioactive waste (RW) generated during the pyrochemical reprocessing of mixed nitride uranium-plutonium spent nuclear fuel. Magnesium potassium phosphate (MPP) compound samples were synthesized under solidification of the electrolyte surrogate solution in a LiCl-KCl-CsCl system. The phase composition and structure of obtained compounds were studied by XRD and SEM-EDS methods. It was found that the compounds possessed a high compressive strength of 17–26 MPa. Hydrolytic stability of the compounds was evaluated in accordance with the long semi-dynamic test GOST R 52126-2003 and with the static PCT test. The <sup>137</sup>Cs content in the leached solutions was determined by gamma-ray spectrometry, and other compound components were determined by ICP–AES and ICP–MS methods. The differential leaching rate of Cs at 25 °C from monolithic samples on the 91st day of samples contact with water was 5–11 × 10<sup>−5</sup> g/(cm<sup>2</sup>·day) (GOST R 52126-2003), and was 4–29 × 10<b><sup>−</sup></b><sup>7</sup> g/(cm<sup>2</sup>∙day) on the 7th day at 90 °C from crushed samples (PCT). The thermal stability of the compound at 180 °C and 450 °C was shown. The characteristics of the obtained MPP compound correspond to the current regulatory requirements for materials for RW conditioning.https://www.mdpi.com/1996-1073/13/8/1963magnesium potassium phosphate compoundradioactive wastespent electrolytecesiumchlorideszeolite |
| spellingShingle | Svetlana A. Kulikova Kseniya Yu. Belova Ekaterina A. Tyupina Sergey E. Vinokurov Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate Compound Energies magnesium potassium phosphate compound radioactive waste spent electrolyte cesium chlorides zeolite |
| title | Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate Compound |
| title_full | Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate Compound |
| title_fullStr | Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate Compound |
| title_full_unstemmed | Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate Compound |
| title_short | Conditioning of Spent Electrolyte Surrogate LiCl-KCl-CsCl Using Magnesium Potassium Phosphate Compound |
| title_sort | conditioning of spent electrolyte surrogate licl kcl cscl using magnesium potassium phosphate compound |
| topic | magnesium potassium phosphate compound radioactive waste spent electrolyte cesium chlorides zeolite |
| url | https://www.mdpi.com/1996-1073/13/8/1963 |
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