Separation of V(IV) and Fe(III) from the acid leach solution of stone coal by D2EHPA/TBP
Separation of V(IV) and Fe(III) from the acid leach solution of stone coal by D2EHPA/TBP
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DOI：
10.1016/j.hydromet.2015.02.003
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发表时间：
2015-03-01
期刊：
影响因子：
4.7
通讯作者：
Zhang, Xiaolin
中科院分区：
文献类型：
--
作者：
Ma, Yiqian;Wang, Xuewen;Zhang, Xiaolin
研究了D2EHPA/TBP从石煤浸出液中分离V(IV)和Fe(III)的效果。实验结果表明，在室温下，用15%(v/v) D2EHPA和2%(v/v) TBP的煤油溶液分级萃取，可以有效地从pH 1.22下含2.87 g/L V(IV)、2.71 g/L Fe(II)和8.45 g/L Fe(III)的溶液中有效分离V(IV)和Fe(III)。与溶剂以O/A比1:1接触20分钟逆流萃取5级后，Fe(III)萃取率为91.5%，共萃取9.18% V(IV)，首先用稀H2SO4溶液洗涤负载的有机相以回收共萃取的钒，然后用1.50 mol/L饱和的NaCl溶液反萃取Fe(III) 盐酸。采用O/A比1:1接触10 min的4级逆流反萃，Fe(III)的反萃率为98.7%。除去Fe(III)后，搅拌下加入CaCO3调节pH至2.40，作为再生溶剂萃取V(IV)的料液。通过6级逆流，O/A比1:1接触10 min，钒的萃取率达到97.4%。载钒有机相加入H2SO4使[H+]升至1mol/L左右后，用V(IV)洗涤液反萃取，得到含V13.7g/L的纯VOSO4溶液。 (C) 2015 Elsevier B.V. 保留所有权利。
The separation of V(IV) and Fe(III) from the add leach solution of stone coal by D2EHPA/TBP was studied. Experimental results showed that V(IV) and Fe(III) can be effectively separated from the solution containing 2.87 g/L V(IV), 2.71 g/L Fe(II) and 8.45 g/L Fe(III) at pH 1.22 by fractional extraction with the kerosene solution of 15%(v/v) D2EHPA and 2%(v/v) TBP at room temperature. After 5 stages of counter-current extraction with the solvent at O/A ratio 1:1 contact for 20 min, Fe(III) extraction was 91.5% with 9.18% V(IV) co-extracted, The loaded organic phase was first scrubbed with dilute H2SO4 solution to recover the co-extracted vanadium, and then the Fe(III) was stripped with the solution of NaCl saturated in 1.50 mol/L HCl. The stripping percentage of Fe(III) was 98.7% by 4 stages counter-current stripping at O/A ratio 1:1 contact for 10 min. After the removal of Fe(III), the solution was used as the feed liquid of V(IV) extraction with the regenerated solvent after adjusting the pH to 2.40 by adding CaCO3 under stirring. The extraction percentage of vanadium reached 97.4% by 6 countercurrent stages at O/A ratio 1:1 contact for 10 min. The vanadium loaded organic phase was stripped with the V(IV) scrubbed solution after adding H2SO4 to increase [H+] to about 1 mol/L, and the pure VOSO4 solution containing 13.7 g/L V was obtained. (C) 2015 Elsevier B.V. All rights reserved.