铀矿石酸化-细菌柱浸的动力学分析

刘玉龙; 李广悦; 王有团; 胡南; 喻清; 马亮; 丁德馨

doi:10.7538/yzk.2017.youxian.0189

铀矿石酸化-细菌柱浸的动力学分析

刘玉龙^1,2,
李广悦¹,
王有团¹,
胡南¹,
喻清¹,
马亮²,
丁德馨^1,*

1.
南华大学铀矿冶生物技术国防重点学科实验室,湖南衡阳421001
2.
中广核铀业发展有限公司,北京100029

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- 刊出日期: 2018-02-19

Kinetic Analysis of Uranium Ore in Acidification and Bacteria Column Leaching

1.
Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang 421001, China
2.
CGNPC Uranium Resources Co., Ltd., Beijing 100029, China

摘要

摘要: 研究了沥青铀矿石酸化阶段和细菌浸出阶段体系中pH值、Eh值和浸出率随时间的变化规律，采用JMA动力学模型分析了酸化过程和细菌浸出过程的动力学行为特征。结果表明：在酸化阶段，同一级数中各酸化体系的pH值和浸出率随酸化时间的增加而升高，Eh值随酸化时间的增加而降低；在细菌浸出阶段，同一级数中各浸出体系的pH值、Eh值和浸出率随浸出时间的增加而升高；随着酸化级数和细菌浸出级数的增加，各酸化体系和浸出体系的pH值、Eh值和浸出率随时间的变化量减小。动力学分析结果表明：酸化阶段的动力学方程为-ln(1-α)=(0.534 9～0.310 3) t^{0.175 7～0.701 6}，初、中期反应过程属于扩散控制，后期反应过程属于混合控制；细菌浸出阶段的动力学方程为-ln(1-α)=(0.132 5～0.002 3)•t^{0.212 7～2.033 0}，初期反应过程属于扩散控制，中期反应过程属于混合控制，后期反应速率接近于零。
- 铀矿石 ,
- 酸化浸出 ,
- 细菌浸出 ,
- 通气柱浸 ,
- 分段动力学
Abstract: The change regulation of pH value, Eh value and leaching rate with time during the process of uranium ore acid leaching and bacteria leaching in column was studied, the kinetic characteristic of acid leaching and bacteria leaching was analyzed by JMA dynamics model. The results show that in the acidification stage, the pH value and uranium leaching rate increase, while the Eh value decreases with time in the same series of the acidification system. In the bacterial leaching stage, the pH value, Eh value and uranium leaching rate increase with leaching time in the same series of the leaching system, and with the increase of acidification and bacterial leaching series, the variable quantities of the pH value, Eh value and uranium leaching rate decrease. The dynamics analyses show that acidification dynamics equation is -ln(1-α)=(0.534 9-0.310 3)t^{0.175 7～0.701 6}, the leaching process is controlled by chemical reaction in initial stage and controlled by diffusion in later stage. The bacterial leaching dynamics equation is -ln(1-α)=(0.132 5-0.002 3)t^{0.212 7～2.033 0}, the leaching process is also controlled by the chemical reaction in initial stage and controlled by diffusion in middle stage, and the reaction rate is close to zero in later stage.
- uranium ore ,
- acidification leaching ,
- bacterial leaching ,
- aeration column leaching ,
- subsection dynamics

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参考文献(22)

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铀矿石酸化-细菌柱浸的动力学分析

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Kinetic Analysis of Uranium Ore in Acidification and Bacteria Column Leaching

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