CMI researchers at Ames Laboratory and Oak Ridge National Laboratory conducted the research for this highlight
Innovation – Chemical treatment discovered with two important results:
- Metal impurities Al and Fe are removed from LIB leachate
- A Ni/Co sulfate double salt is recovered.*
Ammonium phosphate addition to electrochemically produced leachates induces Al and Fe precipitation (up to 99% Al and Fe yield) at pH 3-4. After filtration, Tutton’s salt crystals of Ni/Co ammonium sulfate crystallize.
Significance and Impact
- Reduces consumable acids and bases (pH swings) required by other pretreatment processes without additional water consumption.
- Minimal interference to recovery of high value metals Co, Ni, Mn & Li.
- After Al and Fe precipitates are filtered, Ni/Co crystals form in the parent solution (25-35% recovered).
- Next steps: Assess compatibility and integration with current metal recovery methods (solvent extraction, ion-exchange, precipitation, and electrodialysis)
Hub Target Addressed
Recovery and conversion into high value end products