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首页> 外文期刊>Hydrometallurgy >Extraction kinetics of niobium by tertiary amine N235 using Lewis cell
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Extraction kinetics of niobium by tertiary amine N235 using Lewis cell

机译：Lewis池对叔胺N235萃取铌的动力学

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摘要

The kinetics of the forward extraction of NbO(C2O4)(3)(3-) by N235 was investigated using a Lewis cell. Different parameters such as the niobium concentration, oxalic acid concentration, hydrogen ion concentration, and R3N concentration, as well as extracting temperature were studied separately to examine their effect on the extraction rate of NbO(C2O4)(3)(3-), and a rate equation was deduced based on the analysis. The experimental results demonstrate that the rate of NbO(C2O4)(3)(3-) extraction is controlled by a chemical reaction at the interface rather than in the bulk phase. Further analysis suggests that the NbO(C2O4)(3)(3-) extraction rate is first order with respect to hydrogen ion concentration, niobium concentration, and R3N concentration, and zero order with respect to oxalic acid concentration. The mechanism of NbO(C2O4)(3)(3-) extraction is controlled by the slow distribution of the R3NH+ at the interface to form NbO(C2O4)(3)center dot R3NH2- between the liquid phase and the interface. (C) 2014 Elsevier B.V. All rights reserved.
机译：使用Lewis池研究了N235正萃取NbO（C2O4）（3）（3-）的动力学。分别研究了铌浓度，草酸浓度，氢离子浓度和R3N浓度等不同参数以及萃取温度，以考察它们对NbO（C2O4）（3）（3-）萃取速率的影响，以及基于该分析推导了速率方程。实验结果表明，NbO（C2O4）（3）（3-）的萃取速率受界面处而非本体相中化学反应的控制。进一步的分析表明，NbO（C2O4）（3）（3-）的萃取率相对于氢离子浓度，铌浓度和R3N浓度为一阶，相对于草酸浓度为零阶。 NbO（C2O4）（3）（3-）萃取的机理是通过界面处R3NH +的缓慢分布来控制的，以在液相和界面之间形成NbO（C2O4）（3）中心点R3NH2-。 （C）2014 Elsevier B.V.保留所有权利。

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