Investigation of Re(VII) diffusion in Tamusu clayrock core by through-diffusion method

Yuzhen Sun; Hui Zhang; Rong Hua; Mingbiao Luo; Chuan-Pin Lee; Zhifen Wang; Weigang Liu; Jie Kong; Yunfeng Shi

doi:10.1515/ract-2021-1116

Published by De Gruyter (O) December 7, 2021

Investigation of Re(VII) diffusion in Tamusu clayrock core by through-diffusion method

Yuzhen Sun , Hui Zhang , Rong Hua , Mingbiao Luo , Chuan-Pin Lee , Zhifen Wang , Weigang Liu , Jie Kong and Yunfeng Shi

From the journal Radiochimica Acta

https://doi.org/10.1515/ract-2021-1116

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Abstract

Tamusu area is the primary pre-selection site of clayrock disposal repository for high-level radioactive waste (HLW) in China. However, the research on the migration behavior of nuclides in Tamusu clayrock is still in its infancy. For the first time in laboratory, the diffusion behavior of Re(VII) in Tamusu clayrock core was studied by means of through-diffusion method. The effects of pH, ionic strength and humic acid on the diffusion behavior of Re(VII) in clayrock were studied. The effective diffusion coefficient, apparent diffusion coefficient and rock capacity factor value were obtained. All the experimental conditions of Re(VII) diffusion in Tamusu clayrock are compared with other geological samples under the same conditions in literature data. The diffusion mechanism of radionuclide in Tamusu clay is discussed, which can provide experimental data for site selection and safety assessment of high-level radioactive waste repository in China. The experimental results showed an effective application and reference for the countries disposed HLW in mudrocks or clayrocks, such as France, Belgium etc. in Europe. Moreover, this research can provide the original data support for the metallogenic regularity and prospecting prognosis of rare element rhenium in different geological environments.

Keywords: diffusion coefficient; HLW; Re(VII); Rock capacity factor; Tamusu clayrock; through-diffusion

Corresponding author: Mingbiao Luo, State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China, E-mail: luomingbiao_ecut@126.com; and Chuan-Pin Lee, College of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, Jiangxi, China, E-mail: bennis6723@139.com

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: This research was supported by Grants from National Natural Science Foundation of China (21761002), The State key Laboratory Project jointly built by the Ministry of Nuclear Resources and Environment (NRE1313), National Defense Basic Scientific Research Project (JCKY2017401C005) and Nuclear energy development project.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-10-18

Accepted: 2021-11-20

Published Online: 2021-12-07

Published in Print: 2022-02-23

Investigation of Re(VII) diffusion in Tamusu clayrock core by through-diffusion method

Abstract

References

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