On the identification of Ti-Ta-Nb-oxides in “wiikites” from Karelia

Khanmiri, Mohammad Hosseinpour; Goldwirt, D; Platonova, N.; Janson, Svetlana Yu.; Polekhovsky, Yu; Bogdanov, R.V.

doi:10.15407/mining12.01.028

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…In pure form ferrocyanides are practically not used, since they are highly dispersed powders with low hydraulic-mechanical strength [7]. The use of ferrocyanides in the composition of composite sorbents increases their hydraulic-mechanical strength and makes it possible to use them under dynamic conditions [8].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Study of Physicochemical and Sorption Characteristics of a Composite Sorbent for Purifying Seawater from Cesium

Balybina

Драньков

Тананаев

et al. 2021

MSF

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Представлен оригинальный метод получения композиционных сорбционных материалов на основе смешанных ферроцианидов Ni-K и Zn-K в композиции с силоксан-акрилатной эмульсией и полиэтиленом. Оригинальность метода заключается в гидрофобизации материала за счет введения полиэтиленовых волокон в структуру ферроцианидов. Изучены особенности извлечения микро- и микроконцентраций катионов Cs + , а также радионуклидов Cs-137 из морской воды в статических и динамических условиях. Экспериментальные значения сорбции аппроксимируются согласно уравнениям Фрейндлиха, Ленгмюра, Ленгмюра-Фрейндлиха, а значения максимальной сорбции G max и константы адсорбционного равновесия K lрассчитаны. Установлено, что сорбенты, синтезированные с использованием полиэтилена, при степени очистки морской воды от ионов цезия до 99% обладают наилучшими сорбционными характеристиками. Значения K p для цезия при использовании исследуемых сорбентов могут достигать 10 5 мл / г, что свидетельствует об их перспективности для очистки морской воды от радиоактивного цезия. Описанный подход является примером простого и доступного технологического синтеза эффективных и востребованных на практике сорбентов высокого эксплуатационного качества.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Study of Physicochemical and Sorption Characteristics of a Composite Sorbent for Purifying Seawater from Cesium

Balybina

Драньков

Тананаев

et al. 2021

MSF

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The tendency towards equalization of the 234U/238U isotopic activity ratios in fractions of U(IV) and U(VI) during thermal annealing of metamict polycrase

Hosseinpour Khanmiri,

Bogdanov,

Titov

et al. 2024

Applied Geochemistry

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On the issue of comparing the immobilization characteristics of matrix materials based on Nb–Ta–Ti-oxides of the types AB2O6 and A2B2O7

Hosseinpour Khanmiri,

Bogdanov,

Puchkova

et al. 2024

Sci Rep

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In the study presented here, the initial (that is, before the start of the process of natural hydrochemical influence) mineral formula of metamict polycrase in the composition of granite pegmatites of the Baltic Shield, applying an uranium natural half-leaching period, was calculated. To investigate the characteristics of immobilization of actinides in the studied polycrase, the absolute and relative uranium contents are compared with the corresponding uranium contents in the original betafite of the same deposit and age. It has been shown that over its geological history, betafite has lost up to 80% of its original uranium content. The proportion of uranium preserved in polycrase is twice as high. It is concluded that the difference in the relative content of uranium (27.3 wt% in polycrase and 31.6 wt% in betafite) cannot be the only reason for the complete oxidation of uranium in betafite, given that in polycrase 30% of uranium is preserved in the tetravalent state. It is more likely that the oxidation of uranium in betafite was primarily a result of the low ionicity of the chemical bonds compared to that in polycrase. This allows us to consider minerals of the euxenite group to be quite promising as matrix materials for the immobilization of actinides. At the same time, an opinion was expressed on the advisability of further comparative studies of Nb-Ta-Ti-oxides of the mineral groups AB 2 O 6 and A 2 B 2 O 7 for their use at the final stage of the nuclear fuel cycle. Keywords Isolation of actinides, Mineral-like matrices, Minerals of the euxenite and pyrochlore groups, Hydrochemical weathering processes, Uranium half-leaching period, Initial elemental composition of the mineral

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On the identification of Ti-Ta-Nb-oxides in “wiikites” from Karelia

Cited by 3 publications

References 7 publications

Synthesis and Study of Physicochemical and Sorption Characteristics of a Composite Sorbent for Purifying Seawater from Cesium

Synthesis and Study of Physicochemical and Sorption Characteristics of a Composite Sorbent for Purifying Seawater from Cesium

The tendency towards equalization of the 234U/238U isotopic activity ratios in fractions of U(IV) and U(VI) during thermal annealing of metamict polycrase

On the issue of comparing the immobilization characteristics of matrix materials based on Nb–Ta–Ti-oxides of the types AB2O6 and A2B2O7

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