Solvent extraction of vanadium (IV) from sulfuric acid solution using P507
首发时间:2014-11-04
Abstract:Solvent extractionof vanadium(IV) from sulfuric acid solution has been studied using 2-ethyhexyl phosphonic acid mono 2-ethylhexyl ester (P507) dissolved in kerosene. The different affecting parameters of equilibrium pH, extractant concentration, temperature and extraction isotherm were separately investigated. The extraction of vanadium(IV) from a synthetic sulfuric acid leach solution of stone coal was also examined. The equilibrium study indicated the release of two moles of H+ ions for extraction of one mole of vanadium(IV) and association of two moles of the mono extractant in the extracted species. The extracted complex VOA2 was calculated from slope analysis and confirmed by IR spectra. A positive value of ΔH obtained from temperature variation studies show that the extraction process is endothermic reaction. A continuous counter current simulation extractionand stripping confirmed 96.1% extraction and 99.6% stripping, further attributes to the enrichment 5 times of vanadium(IV) concentration in the strip solution.
keywords: Vanadium Solvent extraction P507
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P507从硫酸盐溶液中萃取钒(IV)的研究
摘要:本文以2-乙基己基膦酸单2-乙基己基酯(P507)为萃取剂、磺化煤油为稀释剂,开展了从硫酸溶液中萃取钒的研究。分别考察了平衡pH值、萃取剂浓度、温度和萃取级数对分配比的影响,并研究了P507从石煤酸浸液中萃取钒的性能。结果表明:钒萃取是一个阳离子交换过程,每个钒离子与两个萃取剂分子中的氢离子发生交换反应,从而形成萃合物。斜率法和红外光谱研究结果表明,萃取物组成为VOA2。热力学研究结果表明,萃取过程焓变为正值,萃合反应为吸热反应。从合成的石煤酸浸液中模拟连续逆流萃取萃取钒,获得的钒萃取率为96.1%、反萃率为99.%,反萃液中钒浓度的富集倍数为5倍。
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No.4615430101284614****
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