使用 Cextrant 230 和 Cyanex 923 的混合物在氯化物介质中协同萃取和分离稀土中的钍,Journal of Rare Earths

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使用 Cextrant 230 和 Cyanex 923 的混合物在氯化物介质中协同萃取和分离稀土中的钍
Journal of Rare Earths ( IF 5.2 ) Pub Date : 2023-04-22 , DOI: 10.1016/j.jre.2023.04.016
Hui Wang , Shengting Kuang , Wuping Liao

为了降低昂贵的Cyanex 923的使用量并提高Cextrant 230系统的萃取能力，研究了Cextrant 230和Cyanex 923的混合物从氯化物介质中协同萃取钍的效果。当Cextrant 230/Cyanex 923摩尔比为1:1时，得到的最大协同增强系数()为1.53。确定Th的协同提取物为ThCl·2Cextrant 230·Cyanex 923。Th的协同提取是一种熵-驱动的放热过程。 0.60 mol/L混合萃取剂对钍的负载量约为17.10 g/L（以ThO计），有机相中负载的钍可以被蒸馏水有效反萃取。为了进行比较，在相似的条件下几乎没有提取出稀土阳离子，这表明该混合物可用于从稀土中分离钍。基于协同萃取系统，开发了从氟碳铈矿盐酸浸出中分离钍的级联萃取工艺。经过3级萃取，浸出液中钍含量明显下降，从19.90 mg/L降至1.4 μg/L，优于单独使用Cextrant 230或Cyanex 923。萃取系统中引入Cextrant 230不仅降低了钍含量，还降低了钍含量。 Cyanex 923 的使用还增强了低酸度下钍的选择性萃取，这意味着协同萃取系统可以比单独的系统更有效、更经济地选择性萃取钍。

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Synergistic extraction and separation of thorium from rare earths in chloride media using mixture of Cextrant 230 and Cyanex 923

In order to lower the usage of expensive Cyanex 923 and increase the extraction capacity of the system of Cextrant 230, the synergistic extraction of thorium from chloride media by a mixture of Cextrant 230 and Cyanex 923 was investigated. The maximum synergistic enhancement coefficient () of 1.53 is obtained at 1:1 molar ratio of Cextrant 230/ Cyanex 923. The synergistic extracted species of Th is determined as ThCl·2Cextrant 230·Cyanex 923. The synergistic extraction of Th is an entropy-driven exothermic process. The loading capacity of 0.60 mol/L mixed extractant for thorium is about 17.10 g/L (calculated as ThO), and the loaded thorium in the organic phase can be effectively stripped by distilled water. For comparison, rare earth cations are barely extracted under the similar conditions, suggesting that the mixtures can be applied to separate thorium from rare earths. A cascade extraction process was developed based on the synergistic extraction system to separate thorium from the hydrochloric acid leaching of bastnaesite. The content of thorium in the leaching solution decreases obviously from 19.90 mg/L to 1.4 μg/L by 3 stages of extraction, which is superior to sole Cextrant 230 or Cyanex 923. The introduction of Cextrant 230 into the extraction system not only lowers the usage of Cyanex 923 but also enhances the selective extraction of thorium at low acidity, implying that the synergistic extraction system can selectively extract thorium more efficiently and economically than the sole systems.

更新日期：2023-04-22

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