Abstract
Laboratory batch experiment of CO2 infiltration under closed conditions was conducted for a period of 30 days on mineral (uranium ore)–water system to understand, (a) how increased CO2 concentration affects the mobility and speciation of uranium (U); (b) change in water chemistry due to CO2 infiltration; and (c) identify geochemical signatures for identification CO2 infiltration. After exposure to CO2, water pH declines rapidly and again rebound and achieved equilibrium till end of the experiment. Speciation of U at mineral–water interface change from (UO2)2CO3(OH) 3 − to carbonato (UO2CO3), fluoride (UO2F+) and sulfato (UO2SO4) complexes. pH and HCO3 − were identified as best geochemical indicators for CO2 infiltration.
Published Version
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