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<p>Cesium and rubidium exhibit immense potential in high-tech industries, rendering the efficient extraction of cesium a matter of paramount importance. Nevertheless, the pronounced chemical resemblances between alkali metals present a formidable obstacle in their separation. This study successfully recovers cesium from the freezing–crystallization liquid of lepidolite ore through solvent extraction, employing t-BAMBP and kerosene, and refines cesium salts by scrutinizing extractant concentration, alkalinity, and O/A ratio. Four-stage countercurrent extraction attains 99.20% Cs<sup>+</sup> recovery, albeit with 11.70% Rb<sup>+</sup> co-extraction. Subsequent scrubbing with 0.1&#xa0;mol/L HI/HBr in a five-stage process (O/A 5:1) eliminates over 99.5% Rb<sup>+</sup>, 97.85% Na<sup>+</sup>, and &gt; 99.5% K<sup>+</sup>. Stripping produces high-purity (99.9%) CsI/CsBr solutions and products. Self-prepared CsI demonstrates comparable performance to commercial counterparts in perovskite solar cell doping. This research furnishes a holistic approach, facilitating cesium's utilization in advanced technological applications.</p>

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Extraction of Cesium from Lithium-Containing Freezing–Crystallization Liquor and Preparation of High-Purity Cesium Salts

  • 期刊论文

  • 发表日期：

    2025年10月6日

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  • Jun’e Wang,
  • Chen Kuang,
  • Risheng Bai,
  • Lei Xu,
  • Renwei Xiao,
  • Qiankun Wang,
  • Hongzhen Xie,
  • Xiang Xue,
  • Chen Chen

摘要

Cesium and rubidium exhibit immense potential in high-tech industries, rendering the efficient extraction of cesium a matter of paramount importance. Nevertheless, the pronounced chemical resemblances between alkali metals present a formidable obstacle in their separation. This study successfully recovers cesium from the freezing–crystallization liquid of lepidolite ore through solvent extraction, employing t-BAMBP and kerosene, and refines cesium salts by scrutinizing extractant concentration, alkalinity, and O/A ratio. Four-stage countercurrent extraction attains 99.20% Cs+ recovery, albeit with 11.70% Rb+ co-extraction. Subsequent scrubbing with 0.1 mol/L HI/HBr in a five-stage process (O/A 5:1) eliminates over 99.5% Rb+, 97.85% Na+, and > 99.5% K+. Stripping produces high-purity (99.9%) CsI/CsBr solutions and products. Self-prepared CsI demonstrates comparable performance to commercial counterparts in perovskite solar cell doping. This research furnishes a holistic approach, facilitating cesium's utilization in advanced technological applications.