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首页> 外文期刊>Metals >Preparation of Highly Pure Vanadyl Sulfate from Sulfate Solutions Containing Impurities of Iron and Aluminum by Solvent Extraction Using EHEHPA
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Preparation of Highly Pure Vanadyl Sulfate from Sulfate Solutions Containing Impurities of Iron and Aluminum by Solvent Extraction Using EHEHPA

机译：用EHEHPA萃取含铁和铝杂质的硫酸溶液制备高纯硫酸氧钒酯。

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The preparation of highly pure vanadyl sulfate from sulfate solutions containing impurities of iron and aluminumwas investigated by solvent extraction with 2-ethylhexyl phosphoric acid mono-2-ethylhexyl ester (EHEHPA) and tri- n -butyl phosphate (TBP) as the phase modifier. The extraction and stripping conditions of vanadium (IV) and its separation from iron and aluminum were optimized. Under the optimal extraction conditions, the extraction of vanadium (IV) and iron were 68% and 53%, respectively, while only 2% aluminum was extracted in a single contact, suggesting good separation of vanadium (IV) from aluminum. Sulfuric acid solution was used for the stripping. Nearly 100% vanadium (IV) and 95% aluminum were stripped, while only 10% iron was stripped under the optimal stripping conditions in a single contact, suggesting good separation of vanadium (IV) from iron. After five stages of extraction and stripping, highly pure vanadyl sulfate containing 76.5 g/L V (IV) with the impurities of 12 mg/L Fe and 10 mg/L Al was obtained, which is suitable for the electrolyte of a vanadium redox flow battery. Organic solution was well regenerated after stripping by oxalic acid solution to remove the remaining iron. The mechanism of vanadium (IV) extraction using EHEHPA was also discussed based on the Fourier transform infrared spectroscopy (FT-IR) analysis.
机译：使用2-乙基己基磷酸单-2-乙基己酯（EHEHPA）和磷酸三正丁酯（TBP）作为相改性剂，通过溶剂萃取研究了从含铁和铝杂质的硫酸盐溶液中制备高纯度硫酸氧钒的方法。优化了钒（IV）的萃取和汽提条件以及从铁和铝中分离的方法。在最佳提取条件下，钒（IV）和铁的提取率分别为68％和53％，而一次接触中仅提取2％的铝，表明钒（IV）与铝的良好分离。硫酸溶液用于汽提。在最佳剥离条件下，一次接触中将近100％的钒（IV）和95％的铝被剥离，而只有10％的铁被剥离，表明钒（IV）与铁的良好分离。经过五个阶段的萃取和汽提，获得了含有76.5 g / LV（IV）且杂质为12 mg / L Fe和10 mg / L Al的高纯度硫酸氧钒，适用于钒氧化还原液流电池的电解质。用草酸溶液汽提除去残留的铁后，有机溶液再生良好。基于傅立叶变换红外光谱（FT-IR）分析，还讨论了使用EHEHPA萃取钒（IV）的机理。

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