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Segregation Melting in the LiAlSi2O6–Na2SO4–NaF System as a Method for the Preparation of Lithium Fluoride

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Abstract—

This paper reports a method for the preparation of lithium fluoride from natural spodumene (LiAlSi2O6) using segregation melting in the LiAlSi2O6–Na2SO4–NaF system. We have studied the formation of immiscible silicate and salt melts, which readily separate from each other owing to low interfacial tension. The salt melt acts as a Li+ concentrator, containing lithium in the form of LiF. Li+ recovery from LiAlSi2O6 to the salt melt is as high as 75%. The silicate melt has been shown to contain small salt melt droplets, which can be leached out by water. Na2SO4 and NaF react to form the double salt Na3SO4F, which then reacts with spodumene to form intermediate compounds, including Li3AlF6.

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Funding

This work was supported by the Russian Foundation for Basic Research, grant no. 20-08-00017 A.

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Authors and Affiliations

  1. Institute of High Temperatures Scientific Association (IVTAN), Russian Academy of Sciences, 127412, Moscow, Russia

    L. M. Delitsyn, R. V. Kulumbegov, V. A. Sinel’shchikov & O. S. Popel’

  2. Tver State Technological University, 170026, Tver, Russia

    M. G. Sul’man

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  1. L. M. Delitsyn
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  2. R. V. Kulumbegov
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  3. V. A. Sinel’shchikov
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  4. O. S. Popel’
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  5. M. G. Sul’man
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Correspondence to L. M. Delitsyn.

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Translated by O. Tsarev

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Delitsyn, L.M., Kulumbegov, R.V., Sinel’shchikov, V.A. et al. Segregation Melting in the LiAlSi2O6–Na2SO4–NaF System as a Method for the Preparation of Lithium Fluoride. Inorg Mater 58, 1065–1074 (2022). https://doi.org/10.1134/S0020168522100065

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