Abstract A comprehensive study on the separation of cesium and rubidium from potassium with 4- tert -butyl-2-( α -methylbenzyl)-phenol ( t -BAMBP) from a synthetic brine solution containing 20 mg/L Cs, 200 mg/L Rb and 5 g/L K was conducted. The effects of alkalinity, t -BAMBP concentration, temperature, A/O ratio on extraction were investigated. It was found that the best conditions to extract cesium and rubidium were using 30% t -BAMBP concentration with 0.1 M NaOH feed solution alkalinity under room temperature, for example 22 °C, at an A/O ratio of 1. Under these conditions, the separation factor of cesium and rubidium over potassium were found to be 139 and 11, respectively. The kinetics of both extraction and stripping were fast with equilibrium reached within 2 min. All extracted cesium and rubidium and 93% potassium were stripped with 0.1 M HCl at an A/O ratio of 1:1 in a single contact. A batch continuous test with 5 extraction stages was conducted under these conditions. It was found that over 99% cesium and rubidium were extracted with 19.4% potassium co-extracted. The concentration ratios of potassium over cesium decreased from 216 in the feed solution to 42 in the loaded organic solution and that of potassium over rubidium from 22 to 4.3, resulting in a decrease in concentration ratios of potassium over cesium and rubidium by about 5 times. Further work should target to test feed solution containing sodium and to improve extraction efficiency and selectivity of the extraction system.

中文翻译：

---

使用 4-叔丁基-2-(α-甲基苄基)-苯酚从盐水溶液中溶剂萃取铯和铷

摘要 用 4-叔丁基-2-(α-甲基苄基)-苯酚 (t-BAMBP) 从含有 20 mg/L Cs、200 mg/L 的合成盐水溶液中分离铯和铷的综合研究进行了 Rb 和 5 g/LK。考察了碱度、t-BAMBP浓度、温度、A/O比对萃取的影响。发现提取铯和铷的最佳条件是在室温（例如 22°C）下使用 30% t-BAMBP 浓度和 0.1 M NaOH 进料溶液碱度，A/O 比为 1。在这些条件下，铯和铷与钾的分离系数分别为 139 和 11。萃取和汽提的动力学都很快，在 2 分钟内达到平衡。所有提取的铯和铷以及 93% 的钾都用 0. 1 M HCl，A/O 比为 1:1，单次接触。在这些条件下进行了具有 5 个提取阶段的批量连续测试。发现超过 99% 的铯和铷与 19.4% 的钾共提取。钾对铯的浓度比从进料溶液中的216降低到负载有机溶液中的42，钾对铷的浓度比从22降低到4.3，导致钾对铯和铷的浓度比降低了约5倍。进一步的工作应该针对测试含有钠的进料溶液并提高萃取系统的萃取效率和选择性。发现超过 99% 的铯和铷与 19.4% 的钾共萃取。钾对铯的浓度比从进料溶液中的216降低到负载有机溶液中的42，钾对铷的浓度比从22降低到4.3，导致钾对铯和铷的浓度比降低了约5倍。进一步的工作应该针对测试含有钠的进料溶液并提高萃取系统的萃取效率和选择性。发现超过 99% 的铯和铷与 19.4% 的钾共提取。钾对铯的浓度比从进料溶液中的216降低到负载有机溶液中的42，钾对铷的浓度比从22降低到4.3，导致钾对铯和铷的浓度比降低了约5倍。进一步的工作应该针对测试含有钠的进料溶液并提高萃取系统的萃取效率和选择性。