An extraction process to recover vanadium from low-grade vanadium-bearing titanomagnetite
An extraction process to recover vanadium from low-grade vanadium-bearing titanomagnetite
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一种从低品位含钒钛磁铁矿中回收钒的提取工艺
DOI：
10.1016/j.jhazmat.2015.03.054
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发表时间：
2015-08-30
影响因子：
13.6
通讯作者：
Wang, Weijing
中科院分区：
文献类型：
--
作者：
Chen, Desheng;Zhao, Hongxin;Wang, Weijing
开发了从低品位含钒钛磁铁矿中回收钒的提取工艺。本研究采用煤油稀释的磷酸二(2-乙基己基)酯(D2-乙基己基)酯(D2EHPA)和磷酸三正丁酯(TBP)的混合溶剂体系从盐酸浸出液中选择性萃取钒，该液中钒浓度低，铁浓度高，且含有Ca、Mg、Al杂质。在萃取过程中，初始溶液pH值和相比对盐酸浸出液中钒的萃取有相当大的影响。在最佳提取条件下（即30-40℃提取10分钟、相比（O/A）1:3、D2EHPA浓度（v/v）20%、初始溶液pH 0-0.8），三级逆流提取工艺提取了99.4%的钒和仅4.2%的铁。在以H2SO4为反萃剂的反萃过程中，在最佳反萃条件（即H2SO4浓度20%、相比5:1（0/A）、反萃时间20 min、反萃温度40℃）下，通过三级逆流反萃工艺，反萃了99.6%的钒和仅5.4%的铁。反萃液含有40.16g/L V2O5、0.691g/L Fe、0.007g/LTiO2、0.006g/L SiO2和0.247g/L CaO。经过氧化、沉淀、煅烧等过程，得到纯度为99.12% V2O5、仅含0.026% Fe的V2O5产品。盐酸浸出液中钒的总回收率为85.5%。 (C) 2015 Elsevier B.V. 保留所有权利。
An extraction process to recover vanadium from low-grade vanadium-bearing titanomagnetite was developed. In this study, a mixed solvent system of di(2-ethylhexyl) phosphate (D2EHPA) and tri-n-butyl phosphate (TBP) diluted with kerosene was used for the selective extraction of vanadium from a hydrochloric acid leaching solution that contained low vanadium concentration with high concentrations of iron and impurities of Ca, Mg, and Al. In the extraction process, the initial solution pH and the phase ratio had considerable functions in the extraction of vanadium from the hydrochloric acid leaching solution. Under optimal extraction conditions (i.e., 30-40 degrees C for 10 min, 1:3 phase ratio (O/A), 20% D2EHPA concentration (v/v), and 0-0.8 initial solution pH), 99.4% vanadium and only 4.2% iron were extracted by the three-stage counter-current extraction process. In the stripping process with H2SO4 as the stripping agent and under optimal stripping conditions (i.e., 20% H2SO4 concentration, 5:1 phase ratio (0/A), 20 min stripping time, and 40 degrees C stripping temperature), 99.6% vanadium and only 5.4% iron were stripped by the three-stage counter-current stripping process. The stripping solution contained 40.16 g/L V2O5, 0.691g/L Fe, 0.007 g/LTiO2, 0.006 g/L SiO2 and 0.247 g/L CaO. A V2O5 product with a purity of 99.12% V2O5 and only 0.026% Fe was obtained after the oxidation, precipitation, and calcination processes. The total vanadium recovered from the hydrochloric acid leaching solution was 85.5%. (C) 2015 Elsevier B.V. All rights reserved.