Optimization of an innovative approach involving mechanical activation and acid digestion for the extraction of lithium from lepidolite |
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Authors: | Nathália Vieceli Carlos A. Nogueira Manuel F. C. Pereira Fernando O. Durão Carlos Guimarães Fernanda Margarido |
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Affiliation: | 1.Center for Innovation, Technology and Policy Research – IN+, Instituto Superior Técnico,University of Lisbon,Lisboa,Portugal;2.LNEG – Laboratório Nacional de Energia e Geologia, I.P., Campus do Lumiar,Lisboa,Portugal;3.CERENA – Centro de Recursos Naturais e Ambiente, DECivil, Instituto Superior Técnico,University of Lisbon,Lisboa,Portugal |
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Abstract: | The recovery of lithium from hard rock minerals has received increased attention given the high demand for this element. There-fore, this study optimized an innovative process, which does not require a high-temperature calcination step, for lithium extraction from le-pidolite. Mechanical activation and acid digestion were suggested as crucial process parameters, and experimental design and re-sponse-surface methodology were applied to model and optimize the proposed lithium extraction process. The promoting effect of amorphi-zation and the formation of lithium sulfate hydrate on lithium extraction yield were assessed. Several factor combinations led to extraction yields that exceeded 90%, indicating that the proposed process is an effective approach for lithium recovery. |
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