摘要
针对传统地浸采铀中溶浸液铀的质量浓度低、浸出效率低等问题,本文提出一种基于外加电场的地浸采铀强化方法。首先,利用仿真建模的方法,构建流-化-质-电多物理场耦合控制的地浸采铀模型;其次,分别设定不同外加电场强度并对模型进行瞬态求解;最后,基于所得瞬态解,从反应速率、传质速率等多个角度分析外加电场对地浸采铀过程的强化机理并量化不同强度外加电场对地浸采铀过程的强化效果。研究结果表明:外加电场可基于电迁移作用,优化矿层内溶浸液中各溶质的浓度分布规律,进而提高浸出反应速率,同时,基于电毛细作用,增大矿体的活性比表面积,提升溶浸液铀的浓度以及缩短生产周期;相对于无外加电场,在地浸前期200 V外加电场下,铀的物质的量提升速度增大32.4%,经济产出阶段提前约40 d,平稳生产阶段的铀的浓度增大13.1%。经1200 d模拟地浸生产,在200 V外加电场下,总浸出铀质量提高15.9%;外加电场对地浸采铀具有显著的强化效果,具有较广阔的应用前景。
To address the issues of low uranyl ion molar concentration and low leaching efficiency in conventional in-situ uranium leaching,a field-enhanced leaching method based on externally applied electric fields was proposed.Firstly,a multi-physics coupled model incorporating flow,chemical reactions,mass transport,and electric fields was constructed through numerical simulation.Then,various intensities of external electric fields were assigned,and the model was solved under transient conditions.Finally,based on the transient solutions obtained,the enhancement mechanism of the electric field on the in-situ leaching process was analyzed from multiple perspectives,including reaction rate and mass transfer rate and the strengthening effects of different field intensities were quantitatively evaluated.The results indicate that the application of an external electric field optimizes the molar concentration distribution of solutes within the leaching solution in the ore body through electromigration,enhancing the leaching reaction rate.Additionally,the electric capillary effect increases the reactive specific surface area of the ore matrix.The molar concentration of uranium in the leaching solution is improved and the production cycle is shortened.In the early stage of in-situ leaching,a 200 V external electric field increases the growth rate of uranium molar concentration by 32.4%compared to the case without an applied field,and advances the onset of the economically productive phase by approximately 40 d.The uranium concentration in the steady-state production phase is increased by 13.1%.Over a simulated leaching period of 1200 d,the total mass of leached uranium is improved by up to 15.9%when a 200 V electric field is applied.The external electric field provides a significant enhancement to the in-situ leaching process and possesses broad prospect for practical application.
作者
曹哲
苏学斌
闻振亁
胥国龙
蒋良兴
CAO Zhe;SU Xuebin;WEN Zhenqian;XU Guolong;JIANG Liangxing(School of Metallurgy and Environment,Central South University,Changsha 410083,China;China National Uranium Co.Ltd.,Beijing 100013,China;Beijing Research Institute of Chemical Engineering and Metallurgy,CNNC,Beijing 101149,China)
出处
《中南大学学报(自然科学版)》
北大核心
2025年第6期2157-2168,共12页
Journal of Central South University:Science and Technology
基金
中国铀业有限公司-东华理工大学核资源与环境国家重点实验室联合创新基金资助项目(2022NRE-LH-06)
湖南省杰出青年基金资助项目(2022JJ10074)。
关键词
地浸采铀
电迁移
电毛细
有限元法
数值计算
in-situ uranium leaching
electromigration
electrocapillarity
finite element method
numerical computation
