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Extraction: Advanced Methods00:56

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Basic Research on Batchwise Multi-stage Extractions Using TODGA for Dy/Nd Separation.

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This study demonstrates efficient multi-stage extraction for separating lanthanides like Dy and Nd using N,N,N

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Area of Science:

  • Chemical Engineering
  • Separation Science
  • Materials Science

Background:

  • Lanthanide separation is crucial for various industrial applications.
  • Diglycolamide (DGA) compounds, particularly N,N,N',N'-tetraoctyl-DGA (TODGA), show promise for lanthanide extraction.
  • High separation factors (SF) between Dy and Nd (SF > 20) are achievable with TODGA in HNO3 media.

Purpose of the Study:

  • To investigate the multi-stage extraction of lanthanides using TODGA.
  • To validate experimental data against theoretical calculations for multi-stage extraction.
  • To optimize conditions for efficient Dy and Nd separation.

Main Methods:

  • Multi-stage liquid-liquid extraction experiments were performed.
  • Batchwise extraction was conducted using a 0.1 M TODGA/n-dodecane organic phase and a 0.3 M HNO3 aqueous phase.
  • Experimental data was compared with computational models to confirm accuracy.

Main Results:

  • Experimental results for multi-stage extraction were consistent with calculations.
  • Ninety-seven percent of Dy was recovered into the organic phase.
  • Nd was reduced to below detection limits, even with a ten-fold higher initial concentration than Dy.

Conclusions:

  • Multi-stage extraction with TODGA is an effective method for separating Dy from Nd.
  • The optimized conditions (0.1 M TODGA/n-dodecane, 0.3 M HNO3, 9x9 stages) enable high recovery and purity.
  • This study provides a validated basis for industrial-scale lanthanide separation processes.