Experimental study and thermodynamic modeling of niobium, tantalum, and uranium behaviour in supercritical fluoride hydrothermal solutions

Авторы: Redkin Alexander F., Kotova Nataliya P., Shapovalov Yury B., Velichkin Vassily I.
Сборник: Solution Chemistry Advances in Research and Applications:
Глава в коллективной монографии
Год издания: 2018
Место издания: Published by Nova Science Publishers, Inc. † New York USA, New York
Первая страница: 1
Последняя страница: 46
Аннотация: The NaF effect on uraninite, pyrochlror and microlite solubility at 800°C is studied. The immiscibility boundaries and compositions of fluid phases L1 and L2 are defined in the system NaF–H2O. It is shown that the solubility of the minerals being studied is higher in the phase L1 than in L2. It is established that microlite solubility even in highly concentrated fluoride solutions is very low. It is found that the interaction of the fluoride solution with UO2 in the immiscibility region leads to the formation of uranium fluoride NaUF5 H2O. The model of “acidification” L1 and “alkalizing” L2 is supposed. ISBN:978-1 -53613 - 102- 4 (e-book)
Добавил в систему: Варламов Дмитрий Анатольевич

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