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. 2024 Dec 13;17(24):6089.
doi: 10.3390/ma17246089.

Selective Scandium Elution from D2EHPA-Impregnated Ion-Exchange Resin After Metal Loading from Acidic Chloride Solutions

Eleni Mikeli  1 , Danai Marinos  1 , Efthymios Balomenos  1 , Dimitrios Panias  1
Affiliations

Selective Scandium Elution from D2EHPA-Impregnated Ion-Exchange Resin After Metal Loading from Acidic Chloride Solutions

Eleni Mikeli et al. Materials (Basel). .

Abstract

This paper investigates the elution behavior of scandium from D2EHPA (Di-(2-ethylhexyl) phosphoric acid)-impregnated resins that proceed with metal loading from acidic chloride solutions. D2EHPA resins stem from their recognized selectivity for Sc extraction from acidic solutions. This study focuses on the elution process after ion-exchange extraction and examines various elution systems to achieve selective Sc recovery. Among the tested elution media, fluoride-based systems were proven effective for Sc desorption. The elution of the resins was demonstrated in a column set-up, where complete and selective elution of Sc was achieved. Τhis study contributes to the advancement of Sc extraction methods from chloride solutions, offering valuable insights for industrial applications, especially emphasizing the importance of optimizing the elution step for achieving efficient recovery of Sc.

Keywords: D2EHPA-impregnated resin and elution; ion exchange; scandium extraction.

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Conflict of interest statement

The authors declare no conflicts of interest.

Figures

Figure 1
Figure 1
Concentration of the eluate solution after batch elution experiment of the metal loaded D2EHPA resin with various agents, resin/solution ratio 1/10, ambient temperature, 24 h.
Figure 2
Figure 2
Batch elution experiments of loaded resin at various HF concentrations, resin/solution ratio 1/40, ambient temperature, 24 h.
Figure 3
Figure 3
Batch elution experiments in three different elution scenarios, resin/solution ratio 1/40, ambient temperature, 24 h (a) scrubbing with 0.1 M HF, (b) scrubbing with 0.5 M HF (c) without scrubbing step.
Figure 4
Figure 4
Cumulative elution of metals using 0.1 M HF and 0.5 M HF for 3 BV.
Figure 5
Figure 5
Kinetic elution experiment in column set-up recycling a fixed amount of 0.1 M HF solution in column set-up with 1 BV/h.
Figure 6
Figure 6
Second-step elution of resin with 3.5 M HF, for 3 BV solution, 1 BV/h−1.
Figure 7
Figure 7
Elution rate distribution in the two-step elution process of the D2EHPA-impregnated resin using HF.
See this image and copyright information in PMC

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