Selective solvent extraction of vanadium over iron from a stone coal/black shale acid leach solution by D2EHPA/TBP
Selective solvent extraction of vanadium over iron from a stone coal/black shale acid leach solution by D2EHPA/TBP
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D2EHPA/TBP 从石煤/黑色页岩酸浸液中选择性溶剂萃取钒/铁
DOI：
10.1016/j.hydromet.2010.10.006
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发表时间：
2011-01-01
期刊：
影响因子：
4.7
通讯作者：
Fan, Gang
中科院分区：
文献类型：
--
作者：
Li, Xingbin;Wei, Chang;Fan, Gang
用煤油稀释的D2 ENPA和TBP混合溶剂体系从用亚硫酸钠还原的酸性石煤浸出液中选择性萃取钒（IV）和铁（II）。在不同的pH值和溶剂浓度下进行了提取研究，并确定了最佳条件。用硫酸汽提负载的有机物。从McCabe-Thiele图确定了钒的提取和汽提所需的级数，并通过逆流模拟研究证实。结果表明，钒的萃取增加的初始pH值和D2 EHPA在有机相中的浓度增加。采用10%（v/v）D2 EHPA和5%（v/v）TBP混合萃取剂，在初始pH为2.48、萃取时间为40 h的条件下，对含V2 O 5 5.78 g/L、总Fe 10.86 g/L的料液进行了6级逆流萃取模拟试验，钒的萃取率为97%。当V_2 O_5含量为5.34 g/L、Fe含量为1.0 g/L时，在O/A = 5：1的相流比下，用15 mol/L的H_2SO_4进行三级逆流反萃，可得到V_2 O_5含量为26.3 g/L、Fe含量为0.72 g/L的反萃液。皇冠版权所有（C）2010由爱思唯尔B. V.出版保留所有权利。
A D2ENPA and TBP mixed solvent system diluted with kerosene were used for the selective extraction of vanadium(IV) from iron(II) from an acidic stone coal leach solution that was reduced using sodium sulfite. Extraction studies were carried out under different pH and solvent concentrations, and optimized conditions were determined. The loaded organic was stripped with sulfuric acid. The number of stages required for the extraction and stripping of vanadium were determined from a McCabe-Thiele plot and confirmed by countercurrent simulation studies. Results demonstrate that the extraction of vanadium increases as the initial pH and the D2EHPA concentration increases in the organic phase. A six-stage counter-current extraction simulation test was conducted over a period of 40 h at a initial pH of 2.48 with 10% (v/v) D2EHPA and 5% (v/v) TBP mixed extractant and resulted in a vanadium extraction of 97% for the feed solution containing 5.78 g/L V2O5 and 10.86 g/L total Fe. The loaded organic phase that contained 5.34 g/L V2O5 and 1.0 g/L Fe can be completely stripped by three-stage counter-current stripping with 15 mol/L H2SO4 at a phase flow ratio of O/A = 5:1 to give a strip solution containing 26.3 g/L V2O5 and 0.72 g/L Fe. Crown Copyright (C) 2010 Published by Elsevier B.V. All rights reserved.