Peculiarities of Chemical Precipitation of Uranium by Ca Phosphates | Sciact - CRIS-система Института катализа

Peculiarities of Chemical Precipitation of Uranium by Ca Phosphates Научная публикация

Журнал

Doklady Earth Sciences
ISSN: 1028-334X , E-ISSN: 1531-8354

Вых. Данные

Год: 2025, Том: 524, Номер: 1, Номер статьи : 10, Страниц : 8 DOI: 10.1134/s1028334x25605929

Ключевые слова

uranium, oxidation state, technogenic solutions, precipitation, calcium phosphates

Авторы

Gaskova O.L. ¹ , Boguslavsky A.E. ¹ , Sofronova S.M. ¹ , Saraev A.A. ³ , Vinokurov Z.S. ^2,3

Организации

1	Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
2	Boreskov Institute of Cathalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia
3	Synthrotron Radiation Facility SKIF, Koltsovo, Russia

Информация о финансировании (2)

1	Министерство науки и высшего образования Российской Федерации (с 15 мая 2018)	FWUR-2024-0042
2	Министерство науки и высшего образования Российской Федерации (с 15 мая 2018)	FWZN-2022-0025 (122041400237-8)

Groundwater purification from U compounds near sludge storages of nuclear fuel cycle (NFC) facilities by precipitation of minerals of the apatite group and/or directly of U (IV, VI) phosphates is a promising method. In laboratory experiments, we demonstrated the efficient U immobilization in solid Ca phosphates during neutralization of natural and technogenic wastewater from two nuclear plants by Na2HPO4 solutions with the removal of more than 98% U. The analysis of sediment by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and scanning electron microscopy (SEM-EDS) confirms the formation of hydroxylapatite and brushite CaH(PO4)⋅(H2O)2. The XPS identification of the U oxidation state revealed the presence of U4+, U5+, and U6+ with the U5+ amount of up to 30–35 at %. Our study is the first demonstrating possible U immobilization in three oxidation states from neutral technogenic and model solutions, which was produced at normal temperature without redox manipulations and the presence of biota. Similar results were previously obtained during the oxidation of UO2 to UO2 + x only. At the same time, a series of thermodynamic calculations showed that the precipitation of U(VI) under atmospheric conditions (an open system) can lead to the formation of surface minerals with evident hyperstoichiometry including U4O9 and U3O8.

Gaskova O.L. , Boguslavsky A.E. , Sofronova S.M. , Saraev A.A. , Vinokurov Z.S.
Peculiarities of Chemical Precipitation of Uranium by Ca Phosphates
Doklady Earth Sciences. 2025. V.524. N1. 10 :1-8. DOI: 10.1134/s1028334x25605929 WOS Scopus OpenAlex СКИФ ID

Поступила в редакцию:	25 февр. 2025 г.
Принята к публикации:	19 мая 2025 г.
Опубликована в печати:	2 авг. 2025 г.
Опубликована online:	2 авг. 2025 г.

Web of science:	WOS:001543137700006
Scopus:	2-s2.0-105012464096
OpenAlex:	W4412857231
СКИФ ID:	4033

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