Séparation des Terres Rares par Extraction par Solvants

Séparer les éléments presque identiques qui sous-tendent l'électronique moderne

Electronics & Semiconductors Global Industrial Scale $12 billion

Aperçu

Rare earth elements (REEs) are separated from each other using multistage counter-current solvent extraction, exploiting the slight differences in their complexation with organophosphorus extractants. The 15 lanthanides plus yttrium and scandium have nearly identical chemical properties, making their separation one of the most challenging industrial processes. REEs are essential for permanent magnets (Nd, Pr, Dy), phosphors (Eu, Tb, Y), catalysts (La, Ce), and fiber optics (Er). China controls approximately 60% of REE mining and 85% of processing.

Procédé chimique

REE-bearing ore (bastnaesite, monazite, or ion-adsorption clay) is dissolved in acid. The mixed REE solution is fed into a cascade of hundreds of mixer-settler units containing organophosphorus extractants (D2EHPA, PC88A, or Cyanex 572) in kerosene. Separation factors of 1.5-3.0 between adjacent lanthanides require 50-200 stages to achieve >99.9% purity for individual elements.

REE³⁺(aq) + 3HA(org) ⇌ REE(A)₃(org) + 3H⁺(aq) (extraction equilibrium, where HA = D2EHPA)
Separation based on slight differences in extraction constants across the lanthanide series

Matières premières

  • REE-bearing minerals (bastnaesite, monazite) — Mining (China, Australia, Myanmar) (REE source)
  • D2EHPA (di-2-ethylhexyl phosphoric acid) — Chemical synthesis (Selective extractant)
  • Hydrochloric acid (HCl) — Chlor-alkali process (Dissolution and stripping agent)

Produits finis

  • Separated REE oxides (Nd₂O₃, Pr₆O₁₁, Dy₂O₃, etc.) — Permanent magnets, catalysts, phosphors, glass polishing (>99.9% individual REE purity)
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Environmental Impact

REE processing generates radioactive waste (thorium and uranium from monazite), acidic wastewater, and organic solvent emissions. Ion-adsorption clay processing in southern China has caused severe environmental damage including deforestation and waterway contamination. Tailings ponds from conventional mining are a long-term liability.

Considérations de sécurité

Innovations récentes

Novel extractants with higher separation factors reduce the number of stages required.
Urban mining (recycling REEs from e-waste, magnets, and phosphors) is gaining momentum.
Ionic liquid extractants offer reduced VOC emissions compared to kerosene-based systems.

Échelle de production

350000

tonnes/an

$12 billion

valeur marchande

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Frequently Asked Questions

What industry uses Séparation des Terres Rares par Extraction par Solvants?
Séparation des Terres Rares par Extraction par Solvants is used in the electronics & semiconductors sector at global industrial scale scale.
What process is involved in Séparation des Terres Rares par Extraction par Solvants?
REE-bearing ore (bastnaesite, monazite, or ion-adsorption clay) is dissolved in acid. The mixed REE solution is fed into a cascade of hundreds of mixer-settler units containing organophosphorus extractants (D2EHPA, PC88A, or Cyanex 572) in kerosene. Separation factors of 1.5-3.0 between adjacent lan
What is the economic significance of Séparation des Terres Rares par Extraction par Solvants?
Séparation des Terres Rares par Extraction par Solvants has a market value of $12 billion and annual production of 350,000 tons.
What is the environmental impact of Séparation des Terres Rares par Extraction par Solvants?
REE processing generates radioactive waste (thorium and uranium from monazite), acidic wastewater, and organic solvent emissions. Ion-adsorption clay processing in southern China has caused severe environmental damage including deforestation and waterway contamination. Tailings ponds from convention
What raw materials are used in Séparation des Terres Rares par Extraction par Solvants?
The main raw materials include: REE-bearing minerals (bastnaesite, monazite), D2EHPA (di-2-ethylhexyl phosphoric acid), Hydrochloric acid (HCl).