Nuclear Engineering and Technology

  • 제54권10호
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  • Pages.3631-3640
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  • 2022
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  • 1738-5733(pISSN)
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  • 2234-358X(eISSN)
한국원자력학회 (Korean Nuclear Society)
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Solidification of uranium mill tailings by MBS-MICP and environmental implications

  • Niu, Qianjin (School of Resource Environment and Safety Engineering, University of South China) ;
  • Li, Chunguang (School of Resource Environment and Safety Engineering, University of South China) ;
  • Liu, Zhenzhong (School of Resource Environment and Safety Engineering, University of South China) ;
  • Li, Yongmei (School of Resource Environment and Safety Engineering, University of South China) ;
  • Meng, Shuo (R&D Center of Radioactive Waste Treatment, Disposal and Modeling, University of South China) ;
  • He, Xinqi (School of Resource Environment and Safety Engineering, University of South China) ;
  • Liu, Xinfeng (School of Resource Environment and Safety Engineering, University of South China) ;
  • Wang, Wenji (School of Nuclear Science and Technology, University of South China) ;
  • He, Meijiao (School of Resource Environment and Safety Engineering, University of South China) ;
  • Yang, Xiaolei (School of Resource Environment and Safety Engineering, University of South China) ;
  • Liu, Qi (School of Resource Environment and Safety Engineering, University of South China) ;
  • Liu, Longcheng (China Institute of Atomic Energy)
  • 투고 : 2022.02.26
  • 심사 : 2022.04.25
  • 발행 : 2022.10.25
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초록

Uranium mill tailing ponds (UMTPs) are risk source of debris flow and a critical source of environmental U and Rn pollution. The technology of microbial induced calcium carbonate precipitation (MICP) has been extensively studied on reinforcement of UMTs, while little attention has been paid to the effects of MICP on U & Rn release, especially when incorporation of metakaolin and bacillus subtilis (MBS). In this study, the reinforcement and U & Rn immobilization role of MBS -MICP solidification in different grouting cycle for uranium mill tailings (UMTs) was comprehensively investigated. The results showed that under the action of about 166.7 g/L metakaolin and ~50% bacillus subtilis, the solidification cycle of MICP was shortened by 50%, the solidified bodies became brittle, and the axial stress increased by up to 7.9%, and U immobilization rates and Rn exhalation rates decrease by 12.6% and 0.8%, respectively. Therefore, the incorporation of MBS can enhance the triaxial compressive strength and improve the immobilization capacity of U and Rn of the UMTs bodies solidified during MICP, due to the reduction of pore volume and surface area, the formation of more crystals general gypsum and gismondine, as well as the enhancing of coprecipitation and encapsulation capacity.

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과제정보

This work was supported by the Natural Science Foundation of Hunan Province, China (2019JJ50496), the Research Foundation of Education Bureau of Hunan Province, China (20B494), and the National Natural Science Foundation of China (U1703123).

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