Lanthanide Sulfate Recovery by Synergistic Dimethyl Ether and Na2SO4 Fractional Crystallization

Tolbert, Chloe; Stetson, Caleb; Prodius, Denis; Orme, Christopher; Appy, David; Nlebedim, Ikenna; Wilson, Aaron D.

doi:10.1002/cssc.202501383

Title: Lanthanide Sulfate Recovery by Synergistic Dimethyl Ether and Na₂SO₄ Fractional Crystallization

Journal Article · Mon Oct 06 00:00:00 UTC 2025 · ChemSusChem

DOI: https://doi.org/10.1002/cssc.202501383 · OSTI ID:2998121

Tolbert, Chloe ^[1]; Stetson, Caleb ^[1]; Prodius, Denis ^[2]; Orme, Christopher ^[1]; Appy, David ^[3]; Nlebedim, Ikenna ^[2];

^[1]

Idaho National Laboratory (INL), Idaho Falls, ID (United States)
Ames Laboratory (AMES), Ames, IA (United States)
TdVib LLC, Boone, IA (United States)

Lanthanides (Lns) are important to many technologies including magnets used in high-efficiency traction motors and generators. While commonly occurring in the environment and industrial waste streams, Ln are generally present at low concentrations. This work demonstrates synergistic Ln recovery from an aqueous magnet leachate to single ppm concentrations using Na₂SO₄ addition and subsequent dimethyl ether-driven fractional crystallization (DME-FC) treatment. It is found that combining DME-FC with low concentrations of Na₂SO₄ (≈0.1 M) results in synergistic isolation of Lns while making use of Na₂SO₄, an excessive byproduct of hydrometallurgical metal production. Combined Na₂SO₄ + DME reduces Ln metal ion (Pr, Nd, Sm, Gd, Dy, and Ho) solubilities by 700–27,000x with final concentrations ranging from 2 ppm to 200 ppm. Separately, Na₂SO₄ 0.1 M provides a 10–200x reduction and DME provides a 90–1,400x reduction in Ln solubilities. Final Ln concentrations of the combined process are 99.8% lower than what is achieved with each individual process.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO)

Grant/Contract Number:: AC02-07CH11358; AC07-05ID14517

OSTI ID:: 2998121

Journal Information:: ChemSusChem, Journal Name: ChemSusChem; ISSN 1864-5631; ISSN 1864-564X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Lanthanide Sulfate Recovery by Synergistic Dimethyl Ether and Na2SO4 Fractional Crystallization

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Title: Lanthanide Sulfate Recovery by Synergistic Dimethyl Ether and Na₂SO₄ Fractional Crystallization