Uptake of uranium by carbonate crystallization from reduced and oxidized hydrothermal fluids

Rinat Gabitov, Artas Migdisov, Anh Nguyen, Noah Van Hartesveldt, Alberto Perez-Huerta, Aleksey Sadekov, Kirsten Benedict Sauer, Jason Baker, Varun Paul, Florie Caporuscio, Hongwu Xu, Robert Roback

Research output: Contribution to journalArticle

Abstract

This work evaluated the immobilization of uranium (U) through incorporation into calcite under reduced and oxidized conditions. We investigated how much U could be entrapped by calcite crystallizing in chloride solutions in autoclaves at temperatures from 162 to 300 °C. The oxidation state of U was set by controlling oxygen fugacity via redox buffers. Uranium was introduced into calcite growth media as a solid oxide compound or U aliquot. We found the uptake of tetravalent U by calcite is higher than that of hexavalent U by up to four orders of magnitude. We estimate that crystallization of a few mg of calcite immobilizes all dissolved U when 1 kg of solution is saturated with UO2 under reduced hydrothermal conditions.

Original languageEnglish
Article number120054
JournalChemical Geology
Volume564
DOIs
Publication statusPublished - 20 Mar 2021

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