Predominance Diagrams of Dissolved Uranium Species and logfO2(g)-pH Diagrams of U-PO43--Nacl-H2O System at 25°C, PCO2=10-3.5 Mpa

Xin Yu Wang; Shi Jun Ni; Ze Ming Shi

doi:10.4028/www.scientific.net/AMR.781-784.3

Paper Titles

Predominance Diagrams of Dissolved Uranium Species and logfO₂(g)-pH Diagrams of U-PO₄^3--Nacl-H₂O System at 25°C, PCO₂=10^-3.5 Mpa
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Predominance Diagrams of Dissolved Uranium Species and logfO₂(g)-pH Diagrams of U-PO₄^3--Nacl-H₂O System at 25°C, PCO₂=10^-3.5 Mpa

Abstract:

To explore the effect of logfO₂(g), pH, uranium concentration, phosphate concentration and NaCl concentration on the predominance diagrams of dissolved uranium species and formation of solid phases containing uranium in the U-PO₄^3--NaCl-H₂O system at 25 °Cand PCO₂=10^-3.5 MPa, the thermodynamic model of this system was constructed. Based on the results of calculation, the logfO₂(g)-pH diagrams were drawn. It can be found that: 1) the formation of uraninite needed enough reductive condition (about logfO₂(g) < -50 ), while the formation of Na-Autunite needed the strict pH range (5<pH<8) in oxidative condition. 2)The addition of phosphate concentration could promote the formation of Na-Autunite, and inhibit the formation of U₄O₉(C). 3)The independent increasing of uranium concentration can lead to more kinds of uranium species.4) The variance of NaCl concentration had little impact on the formation of solid phases containing uranium.

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Advanced Materials Research (Volumes 781-784)

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3-8

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https://doi.org/10.4028/www.scientific.net/AMR.781-784.3

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September 2013

Authors:

Xin Yu Wang, Shi Jun Ni, Ze Ming Shi

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LogFO₂(g)-pH Diagram, U-PO₄^3--NaCl-H₂O System

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