Effect of pH and Fe/U ratio on the U(VI) removal rate by the synergistic effect of Fe(II) and O2

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Fu, Yukui^1 ; Luo, Yingfeng^1 ; Fang, Qi^1,2 ; Xie, Yanpei^1 ; Wang, Zhihong^1 ; Zhu, Xiangyu^1

School of Environment and Safety Engineering, University of South China, 421001, China^1

Hunan Provincial Engineering and Technology Research Center of Uranium Mining Tailings Treatment, 421001, China^2

关键词: Acidic conditions;    All solutions;    Batch experiments;    Neutral conditions;    Oxidation of Fe;    pH condition;    Removal rate;    Synergistic effect;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/3/032043/pdf
DOI  :  10.1088/1755-1315/121/3/032043

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

As for the decommissioned uranium deposits of acid in-situ leaching, both of the concentrations of U(VI) and Fe(II) are relatively high in groundwater. In the presence of O2, the oxidation of Fe(II) into Fe(III) that forms Fe-hydroxides could effectively remove U(VI) in the forms of sorption or co-precipitation. In this process, pH condition and Fe content will have a significant effect on the U(VI) removal rate by the synergistic effect of Fe(II) and O2. In the present work, a series of batch experiments were carried out to investigate the effect of pH values and Fe/U mass ratio on the U(VI) removal rate by the synergistic effect of Fe(II) and O2. Experiment results show that the removal rate of U(VI) is mainly controlled by pH and secondly by Fe/U mass ratio. In the neutral conditions with pH at 7 and 8, the removal rate of U(VI) reaches up to 90% for all solutions with different initial Fe(II) concentrations. The optimal pH for the removal rate of U(VI) is above 7. In the acidic conditions with pH below 6, the effect of Fe/U mass ratio on the removal rate of U(VI) becomes more obvious and the optimal Fe/U mass ratio for U(VI) removal is 1:2.