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New Environmental Impact Data on Scandium Extraction Process from Bauxite Residue

Strategic Insights

— 1 min read

Researchers from the Massachusetts Institute of Technology have published a new study on the environmental impact of a hydrometallurgical route for Scandium extraction from bauxite residue, also known as red mud. The study, funded by the Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) and the Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP), aimed to investigate the impact of iron content on Scandium recovery and evaluate the environmental impact of the process. The researchers found that a combination of extractants, Cyanex 923 and Alamine 336, improved Scandium selectivity by minimizing iron extraction at specific pH levels.

Key Takeaways:

  • The extraction of Scandium from bauxite residue is a promising but challenging secondary source due to the high iron content.
  • The study used a hydrometallurgical route involving leaching with H2SO4 followed by solvent extraction with Cyanex 923 and Alamine 336.
  • A synergistic combination of these extractants was tested to increase selectivity, with Cyanex 923 extracting nearly 100% of Scandium.
  • However, the co-extraction of iron (25-80%) remained a significant challenge, highlighting the need for further optimizations.
  • The study concluded that further research is needed for industrial-scale application, particularly concerning environmental impacts.
  • The research has been peer-reviewed and published in the Journal of the Minerals, Metals & Materials Society (JOM) in 2025.

Statistics:

  • 25-80% of iron was co-extracted with Scandium using Cyanex 923.
  • The combination of Cyanex 923 and Alamine 336 improved Scandium selectivity by minimizing iron extraction at pH 0.5-1.0.
  • 100% Scandium extraction was achieved using Cyanex 923.
  • The study focused on the extraction of Scandium from bauxite residue, a promising but challenging secondary source.

Sources:

  • VerticalNews (October 17, 2025)
  • NewsRx LLC (2025)
  • Massachusetts Institute of Technology (2025)
  • Journal of the Minerals, Metals & Materials Society (JOM) (2025)
  • Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
  • Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)

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