Extraction of lithium from β-spodumene using sodium sulfate solution

Add time:08/02/2019    Source:sciencedirect.com

The anticipated increase in demand for lithium salt brings a growing concern over lithium shortage and environmental problems in the industry of extracting lithium from ores. A closed-loop process for the extraction of lithium from β-spodumene (β-LiAlSi2O6) by leaching with Na2SO4, the by-product of the lithium precipitation process, was proposed. Two kinds of additives (CaO and NaOH) were employed to enhance extraction effect, respectively. The lithium extraction efficiencies were recorded to be 93.30% with CaO addition and 90.70% with NaOH addition, which have the more environmentally friendly and economically viable latent capacity in comparison to the currently industrialized sulfuric acid method. By analysis of leaching residue, the extraction mechanism was found to be high-chemoselective ion-exchange between Li+ in β-LiAlSi2O6 and Na+ in Na2SO4 solution.

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