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<p>The study meticulously investigated the impact of various fluorides, including CaF<sub>2</sub>, NaF, NH<sub>4</sub>F, and KF, on potassium leaching from phosphorus-potassium associated ore—a byproduct of the mining process-when subjected to hydrochloric acid treatment at temperatures ranging from 60 to 90&#xa0;°C. The leaching efficiencies for potassium were found to be significantly high, achieving 89.5% with CaF<sub>2</sub>, 82.2% with NaF, 83.8% with NH<sub>4</sub>F, and 78.1% with KF, respectively. Among the fluorides studied, CaF<sub>2</sub> emerged as the most effective additive, enhancing potassium leaching efficiency under all tested conditions. This superior performance is attributed to the marginal solubility of CaF<sub>2</sub>. This similarity facilitates a more efficient utilization of HF, thereby minimizing undesirable side reactions with CaF<sub>2</sub> during the acid leaching process. The investigation further delineated that the kinetic data pertaining to leaching with different fluorides segregates into two pronounced stages. The kinetics of each stage was adeptly encapsulated by employing the classical shrinking core model, wherein the chemical reaction emerges as the pivotal rate-determining step.</p>

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Effect of Fluorides on the Leaching of Potassium from Phosphorus-Potassium Associated Ore

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • Junfeng Zhou,
  • Lixia Wu,
  • Dongsheng He,
  • Chen Wang,
  • Jiayu Ma

摘要

The study meticulously investigated the impact of various fluorides, including CaF2, NaF, NH4F, and KF, on potassium leaching from phosphorus-potassium associated ore—a byproduct of the mining process-when subjected to hydrochloric acid treatment at temperatures ranging from 60 to 90 °C. The leaching efficiencies for potassium were found to be significantly high, achieving 89.5% with CaF2, 82.2% with NaF, 83.8% with NH4F, and 78.1% with KF, respectively. Among the fluorides studied, CaF2 emerged as the most effective additive, enhancing potassium leaching efficiency under all tested conditions. This superior performance is attributed to the marginal solubility of CaF2. This similarity facilitates a more efficient utilization of HF, thereby minimizing undesirable side reactions with CaF2 during the acid leaching process. The investigation further delineated that the kinetic data pertaining to leaching with different fluorides segregates into two pronounced stages. The kinetics of each stage was adeptly encapsulated by employing the classical shrinking core model, wherein the chemical reaction emerges as the pivotal rate-determining step.