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<p>Sulfate roasting is a widely used industrial method for extracting valuable metals from lepidolite. In previous studies, achieving high leaching efficiency often required the breakdown of the mica's aluminosilicate structure, leading to the generation of large amounts of waste residue. In this work, building upon prior research, we propose a strategy for efficiently extracting lithium through ion exchange while preserving the lamellar structure of mica. A systematic study was conducted on lithium extraction from lepidolite via sodium sulfate roasting followed by acid leaching. Among the tested sulfates, sodium sulfate exhibited the best performance, consistent with thermodynamic predictions. Under optimal conditions: Na<sub>2</sub>SO<sub>4</sub>/lepidolite mass ratio of 0.9:1, roasting at 800&#xa0;°C for 80&#xa0;min, leaching with 1&#xa0;mol·L⁻<sup>1</sup> H₂SO₄ at 30&#xa0;°C, liquid-to-solid ratio of 2:1, and leaching time of 30&#xa0;min, a lithium leaching efficiency of 96.85% was achieved. Characterization by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscope-Energy Dispersive Spectrometer (SEM–EDS) confirmed the retention of the layered structure of lepidolite without the formation of excessive secondary residues. Compared to conventional water leaching, acid leaching showed superior efficiency, as the low-pH environment inhibited the formation of poorly soluble LiNaSO₄, thus enhancing lithium release. Kinetic analysis revealed that the leaching process followed a chemical reaction-controlled model, and the reaction rate constant of acid leaching was approximately three times that of water leaching, indicating a clear kinetic advantage. This environmentally friendly approach provides a promising strategy for the industrial application of lepidolite in lithium extraction.</p> Graphical Abstract <p></p>

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Control of Roasting Temperature and Time for Efficient Lithium Extraction and Retention of Lamellar Crystal Structure in Lepidolite

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Delong Yang,
  • Shuai Yuan,
  • Qingbin Liu,
  • Qinglong Fan,
  • Guodong Wen

摘要

Sulfate roasting is a widely used industrial method for extracting valuable metals from lepidolite. In previous studies, achieving high leaching efficiency often required the breakdown of the mica's aluminosilicate structure, leading to the generation of large amounts of waste residue. In this work, building upon prior research, we propose a strategy for efficiently extracting lithium through ion exchange while preserving the lamellar structure of mica. A systematic study was conducted on lithium extraction from lepidolite via sodium sulfate roasting followed by acid leaching. Among the tested sulfates, sodium sulfate exhibited the best performance, consistent with thermodynamic predictions. Under optimal conditions: Na2SO4/lepidolite mass ratio of 0.9:1, roasting at 800 °C for 80 min, leaching with 1 mol·L⁻1 H₂SO₄ at 30 °C, liquid-to-solid ratio of 2:1, and leaching time of 30 min, a lithium leaching efficiency of 96.85% was achieved. Characterization by X-ray diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscope-Energy Dispersive Spectrometer (SEM–EDS) confirmed the retention of the layered structure of lepidolite without the formation of excessive secondary residues. Compared to conventional water leaching, acid leaching showed superior efficiency, as the low-pH environment inhibited the formation of poorly soluble LiNaSO₄, thus enhancing lithium release. Kinetic analysis revealed that the leaching process followed a chemical reaction-controlled model, and the reaction rate constant of acid leaching was approximately three times that of water leaching, indicating a clear kinetic advantage. This environmentally friendly approach provides a promising strategy for the industrial application of lepidolite in lithium extraction.

Graphical Abstract