Nissan and Waseda University announce recycling process for rare-earth compounds

Nissan’s testing has shown that this process can recover 98% of the motors’ REEs.

Nissan and Waseda University are testing a jointly developed recycling process that recovers high-purity rare-earth compounds from EV motor magnets.

Process overview:

  1. A carburizing material and pig iron are added to the motor, which is then heated to at least 1,400 C and begins to melt.
  2. Iron oxide is added to oxidize the REEs in the molten mixture.
  3. A small amount of borate-based flux, which is capable of dissolving rare-earth oxides even at low temperatures and highly efficiently recovering REEs, is added to the molten mixture.
  4. The molten mixture separates into two liquid layers, with the molten oxide layer(slag) that contains the REEs floating to the top, and the higher density iron-carbon(Fe-C) alloy layer sinking to the bottom.
  5. The REEs are then recovered from the slag.

View full article at CHARGEDEVS.COM

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