Solvent extraction of vanadium from a H2SO4-HF mixed acids leaching solution of stone coal
首发时间:2014-11-07
Abstract:Di (2-ethylhexyl) phosphoric acid (P204) and tri-n-butyl phosphate (TBP) were used to extraction vanadium from a H2SO4-HF mixed acids leaching solution of stone coal in this paper. Effect of different operational factors such as equilibrium pH, extractant concentration, extraction stage, strip solution concentration, phase ratio were examined to optimize the condition for selective and quantitative extraction and stripping of vanadium. Based on the results of extraction as well as stripping isotherm, the extraction of vanadium was quantitative in six stages using 10% P204 and 5% TBP at A:O ratio of 1:1 and equilibrium pH of 2.4; 99.6% percentage stripping of vanadium from the loaded organic phase was obtained by five stage stripping using 1.5 mol/L H2SO4 at A:O ratio of 1:8. In the solvent extraction process, scrubbing is necessary for removing co-extracted and entrainment impurities by dilute sulfuric acid solution, more than 90% iron and arsenic can be scrubbed by 0.2 mol/L sulfuric acid.
keywords: Solvent extraction Vanadium P204 Stone coal
点击查看论文中文信息
溶剂萃取法从含钒石煤H2SO4-HF混合酸浸液中萃取分离钒的研究
摘要:本文开展了二(2-乙基己基)磷酸(P204)和磷酸三丁脂(TBP)-磺化煤油萃取体系从含钒石煤H2SO4-HF混合酸浸液中萃取钒的研究。考察了平衡pH值、萃取剂浓度、萃取级数、反萃剂浓度、相比等因素对钒萃取率和反萃率的影响。实验结果表明,采用10% P204-5%TBP-磺化煤油组成的萃取体系在相比(A:O)为1:1,萃取平衡pH值为2.4的条件下,经过六级逆流萃取,钒萃取率达到96.7%。采用1.5 mol/L硫酸进行反萃,在相比(A:O)为1:8的条件下,经过五级逆流反萃,反萃率达到99.6%。在萃取过程中,洗涤可以除去因共萃和夹带进入有机相中的杂质离子,采用0.2 mol/L硫酸为洗涤剂,有机相中大于90%的铁和砷均被洗涤下来。
基金:
论文图表:
引用
No.4616474101284614****
同行评议
共计0人参与
勘误表
溶剂萃取法从含钒石煤H2SO4-HF混合酸浸液中萃取分离钒的研究
评论
全部评论0/1000