Mechanochemical extraction of lithium at low temperature (MELLT) from chemical-grade domestic α-spodumenes

image of a Flow diagram showing the industry standard processes and the MELLT approach for Li-extraction from α-spodumene — Flow diagram showing the industry standard processes and the MELLT approach for Li-extraction from α-spodumene

CMI researchers from Ames National Laboratory conducted the research for this highlight.

Innovation
Disruptive mechanochemical process to extract 85+% of lithium available in domestic hard-rock ore.

Achievement
The MELLT process so far yields 75% lithium extraction from chemical-grade domestic α-spodumene at a 250 g scale with minimal acid usage and temperatures below 100 °C. Process cost savings are estimated at ~45% per ton of Li₂CO₃ produced.

Significance and Impact

Elimination of the high-temperature thermal-decrepitation step.
Avoidance of harsh acid/alkaline solutions with mild alternatives.
Viable alternative to traditional energy- and waste-intensive methods for Li recovery from hard rock, greatly reducing energy costs.

Hub Target Addressed
Recovery and conversion of critical minerals into high-value end products. Industry adoption of technology for the source-diversification of lithium.