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Uranium re-adsorption on uranium mill tailings and environmental implications.

Meiling Yin1, Jing Sun2, Hongping He3

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|September 8, 2021
PubMed
Summary

Uranium mill tailings (UMTs) re-adsorption significantly impacts uranium release, potentially underestimating environmental risks. Understanding these processes is key for effective uranium waste remediation strategies.

Keywords:
Re-adsorption mechanismRemediation indicationSolid wastesUraniumWaste management

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Nuclear Waste Management

Background:

  • Uranium mill tailings (UMTs) are a major source of environmental uranium pollution.
  • Leaching tests commonly assess uranium release, but the role of re-adsorption is understudied.
  • Re-adsorbed uranium can be remobilized, impacting risk assessments.

Purpose of the Study:

  • To investigate the role and mechanisms of uranium re-adsorption during leaching of UMTs.
  • To determine the influence of particle size and environmental factors on uranium re-adsorption.
  • To evaluate the implications of uranium re-adsorption for environmental risk and remediation.

Main Methods:

  • Analysis of mineralogical composition and aqueous uranium speciation.
  • Investigation of UMTs with varying particle sizes under different leaching conditions.
  • Paired data analysis correlating environmental factors with U re-adsorption capacity.

Main Results:

  • Significant uranium re-adsorption was observed, primarily on chlorite, albite, and muscovite.
  • Uranium re-adsorption occurred via inner-sphere complexation and surface precipitation, influenced by pH.
  • Sulfate and phosphate enhanced uranium re-adsorption, particularly via inner-sphere complexation.

Conclusions:

  • Uranium re-adsorption processes in UMTs are significant and influence uranium mobility.
  • Environmental risks associated with UMTs may be underestimated due to neglecting re-adsorption.
  • Findings provide insights for developing effective in-situ remediation strategies for uranium-contaminated sites.