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<p>The increasing demand for lithium, driven by emerging energy technologies, necessitates the development of innovative extraction techniques from correlated resources such as fly ash. This study proposes a novel strategy for co-extraction of lithium and silicon from fly ash, employing the carbochlorination method. The influences of various parameters were evaluated using response surface methodology. The co-extraction mechanism for lithium and silicon from fly ash was elucidated via XRD and SEM analytical methods. The response surface analysis results showed a significant synergistic extraction effect between lithium and silicon in fly ash. The optimal results show that under the same optimization conditions, the co-extraction efficiency of lithium and silicon in fly ash is 88.72 and 77.15&#xa0;pct, respectively. The Si-bearing phase decomposition facilitated Li release during the phase transformation. These findings highlight the potential use of the carbochlorination method for lithium and silicon co-extraction from fly ash.</p> Graphical Abstract <p></p>

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Optimization of the Co-extraction of Lithium and Silicon from Fly Ash Through the Carbochlorination Process: A Response Surface Methodology Approach

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Wang Long,
  • Zhang Zi-Mu,
  • Zhao Xin-Xin,
  • Zhang Ting-An,
  • Dou Zhi-He,
  • Lv Guo-Zhi,
  • Liu Yan

摘要

The increasing demand for lithium, driven by emerging energy technologies, necessitates the development of innovative extraction techniques from correlated resources such as fly ash. This study proposes a novel strategy for co-extraction of lithium and silicon from fly ash, employing the carbochlorination method. The influences of various parameters were evaluated using response surface methodology. The co-extraction mechanism for lithium and silicon from fly ash was elucidated via XRD and SEM analytical methods. The response surface analysis results showed a significant synergistic extraction effect between lithium and silicon in fly ash. The optimal results show that under the same optimization conditions, the co-extraction efficiency of lithium and silicon in fly ash is 88.72 and 77.15 pct, respectively. The Si-bearing phase decomposition facilitated Li release during the phase transformation. These findings highlight the potential use of the carbochlorination method for lithium and silicon co-extraction from fly ash.

Graphical Abstract