This research covers a new continuous solvent extraction “solutions spray system” technique to extract lanthanum (La), neodymium (Nd), and europium (Eu) from chloride solution using DEHPA. This setup enhanced the extraction kinetics and mass transfer compared to the conventional mixer-settler by generating micro-sized droplets of the feed streams in the mixing chamber, causing speedy and better mass transfer, and the special design of the settling column boosted the separation process with improved quality products. Variables like pH, DEHPA concentration, ionic strength, and aqueous/organic phase ratio were studied to determine the performance of this setup. At the optimum values of these variables (2.0 pH, 0.303 M DEHPA, and 1.54 mol/L ionic strength), the percent extraction of La, Nd, and Eu was 95.03 %, 99.36 %, and 99.98 %, and the distribution ratio was 19.14, 155.25 and 4165 respectively, which showed the extraction in a single stage. Furthermore, the values of separation factors, SF = 6.69, SF = 5.33, and SF = 1.26 at 0.50 pH, showed the selectivity of these elements. Later on, McCabe Thiele diagrams were plotted for extraction and stripping sections to see the minimum number of theoretical stages for the complete recovery of REEs and their selective separation from each other.

中文翻译：

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使用新设计的溶液喷雾系统溶剂萃取 La、Nd 和 Eu


这项研究涵盖了一种新的连续溶剂萃取“溶液喷雾系统”技术，使用 DEHPA 从氯化物溶液中萃取镧 (La)、钕 (Nd) 和铕 (Eu)。与传统的混合沉降器相比，该装置通过在混合室中产生进料流的微米级液滴，增强了萃取动力学和传质，从而实现快速和更好的传质，并且沉降塔的特殊设计促进了分离过程提高产品质量。研究了 pH、DEHPA 浓度、离子强度和水相/有机相比率等变量，以确定该装置的性能。在这些变量的最佳值（2.0 pH、0.303 M DEHPA 和 1.54 mol/L 离子强度）下，La、Nd 和 Eu 的提取百分比分别为 95.03 %、99.36 % 和 99.98 %，分配比为分别为 19.14、155.25 和 4165，这表明提取是在单阶段中进行的。此外，pH 0.50 时的分离因子值 SF = 6.69、SF = 5.33 和 SF = 1.26 显示了这些元素的选择性。后来，麦凯布·蒂勒 (McCabe Thiele) 图绘制了萃取和汽提部分，以了解完全回收稀土元素及其相互选择性分离的最小理论阶段数。