Batch and continuous experiments were carried out in a Scheibel extraction column to separate La(III) from Ce(III). Central composite design was used to evaluate the influence of pH, extractant concentration in the batch experiments, and the influence of rotor speed, phase flow rates in the continuous experiments. At optimum conditions (pH 3.5, D2EHPA extractant concentration 0.05 M, rotor speed 128 rpm, dispersed phase flow rate 32 L/h and continuous phase flow rate 18 L/h), high extraction efficiency and separation factor equal to 88.12% and 4.89, respectively, for cerium separation from lanthanum were reasonably well predicted by the model. At higher rotor speed, La(III) and Ce(III) ions move faster from aqueous to the organic phase, which retards the higher interaction between ions and D2EHPA extractant. The results showed that this extraction column could be a potential candidate for the extraction and separation of La(III) and Ce(III) ions or other industrial wastewater.

中文翻译：

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使用中试装置 Scheibel 萃取柱从水溶液中萃取分离镧和铈的可行性研究

在 Scheibel 萃取柱中进行分批和连续实验以从 Ce(III) 中分离 La(III)。中心复合设计用于评估间歇实验中pH值、萃取剂浓度的影响，以及连续实验中转子速度、相流速的影响。在最佳条件下（pH 3.5，D2EHPA萃取剂浓度0.05 M，转子转速128 rpm，分散相流速32 L/h和连续相流速18 L/h），提取效率高，分离因子分别为88.12%和4.89，分别，对于铈与镧的分离，模型可以很好地预测。在更高的转子速度下，La(III) 和 Ce(III) 离子从水相移动到有机相的速度更快，这阻碍了离子与 D2EHPA 萃取剂之间更高的相互作用。