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In this research work, the direct roastingRoasting reaction of pure α-spodumene (LiAlSi2O6) withNaF NaF through thermodynamicThermodynamics simulationSimulation using the equilib module included in the FactSage 8.2 software was studied. The LiAlSi2O6:NaF molar ratios (RM) analyzed: 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.85, 1:1, and 1:2.0 in the temperatureTemperature interval from 50 to 1200 °C and 1 atmosphere of pressure determining the chemical species in equilibrium every 50 °C through Gibbs energy minimization. The most thermodynamically stable chemical species formed in all RMs were: LiF, NaAlSi3O8, and NaAlSiO4.The maximum percentage yield (PY) for the LiF specie was 99% in the solid state starting at 250 °C and in the liquid state at temperatureTemperature ≥850 °C for the 1:1 RM with an excess of NaF of 0.0008%. The results obtained demonstrated that direct roastingRoasting of α-spodumene usingNaF NaF is thermodynamically favored in the temperatureTemperature range studied which was confirmed by the formation of lithiumLithium fluoride in solid phase or liquid phase and allowed to propose the reaction mechanism.

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Thermodynamic Simulation of LiF Obtaining of α-spodumene by Direct Roasting with NaF

  • 会议论文

  • 发表日期：

    2025年

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  • M. Pérez-Labra,
  • A. Hernández-Ramírez,
  • J. A. Romero-Serrano,
  • M. U. Flores-Guerrero,
  • F. Patiño-Cardona,
  • M. Reyes-Pérez,
  • A. Cruz-Ramírez,
  • F. R. Barrientos-Hernández,
  • J. C. Juárez Tapia

摘要

In this research work, the direct roastingRoasting reaction of pure α-spodumene (LiAlSi2O6) withNaF NaF through thermodynamicThermodynamics simulationSimulation using the equilib module included in the FactSage 8.2 software was studied. The LiAlSi2O6:NaF molar ratios (RM) analyzed: 1:0.5, 1:0.6, 1:0.7, 1:0.8, 1:0.85, 1:1, and 1:2.0 in the temperatureTemperature interval from 50 to 1200 °C and 1 atmosphere of pressure determining the chemical species in equilibrium every 50 °C through Gibbs energy minimization. The most thermodynamically stable chemical species formed in all RMs were: LiF, NaAlSi3O8, and NaAlSiO4.The maximum percentage yield (PY) for the LiF specie was 99% in the solid state starting at 250 °C and in the liquid state at temperatureTemperature ≥850 °C for the 1:1 RM with an excess of NaF of 0.0008%. The results obtained demonstrated that direct roastingRoasting of α-spodumene usingNaF NaF is thermodynamically favored in the temperatureTemperature range studied which was confirmed by the formation of lithiumLithium fluoride in solid phase or liquid phase and allowed to propose the reaction mechanism.