Which Flotation Scheme Boosts Spodumene Recovery to 85% for Lithium Batteries?

Robin

Senior Economic Geologist & Ore Analyst

2026-02-10

Researchers and industry experts have investigated and optimized flotation schemes to enhance the recovery of spodumene, a key lithium-bearing mineral used in lithium battery production. A flotation scheme capable of boosting spodumene recovery to approximately 85% typically involves the following:

1. Pre-concentration: This reduces the dilution of feed, often using dense media separation or gravity separation, to concentrate spodumene before flotation.

2. Conditioning with Reagents:

   • Collectors: Fatty acid-based collectors (e.g., oleic acid) are commonly used to selectively adsorb on spodumene surfaces to enhance flotation performance.
   • Depressants: Sodium silicate or other reagents may be added to depress unwanted gangue minerals like quartz or feldspar.
   • pH Adjusters: Maintaining an optimal pH (usually between 7 and 10) is critical. Sodium hydroxide is often used to create an alkaline medium, which improves the selectivity for spodumene.

3. Froth Flotation Process:

   • Conditioning the slurry and fine-tuning the air-to-pulp ratio within the flotation cell maximizes the separation of spodumene from other minerals.
   • Modification of reagents and fine particle adjustment can significantly impact recovery rates.

4. Regrinding and Multi-Stage Flotation: Sometimes a multi-stage cleaning circuit combined with fine grinding is employed to achieve a purer concentrate and a higher recovery rate close to or above 85%.

Recent advancements may include using environmentally friendly reagents and optimizing energy-efficient flotation technologies. Research papers and pilot plant data from universities and companies should be consulted for more specific formulations and techniques achieving such high recovery rates.

Emerging approaches, like ion flotation and the use of advanced surfactants, might also contribute to further boosting recovery efficiencies in the near future.

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