Extraction of vanadium from chloride solution with high concentration of iron by solvent extraction using D2EHPA
Extraction of vanadium from chloride solution with high concentration of iron by solvent extraction using D2EHPA
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使用 D2EHPA 溶剂萃取从高浓度铁氯化物溶液中提取钒
DOI：
10.1016/j.seppur.2014.01.031
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发表时间：
2014
影响因子：
8.6
通讯作者：
Yu Ping
中科院分区：
文献类型：
--
作者：
Hu Guoping;Chen Desheng;Wang Lina;Liu JingChong;Zhao Hongxin;Liu Yahui;Qi Tao;Zhang Changqiao;Yu Ping
制备了Fe(II)/V(IV)质量比为60的含钒氯化物溶液，模拟酸性溶液对还原的含钒钛磁铁矿进行盐酸浸出。用双(2-乙基己基)磷酸(D2EHPA)萃取剂从溶液中提取钒。在平衡H+浓度为0.27~0.42nmol/L，D2EHPA浓度(v/v，正庚烷稀释)为10%，萃取温度为20~25℃，平衡时间为60min，相比(O/A)为1：1的最佳萃取条件下，钒的萃取率可达99%以上。用稀H_2SO_4溶液反萃负载有机相，最佳反萃条件为：H_2SO_4浓度为20%，O/A为10：1，反萃时间为120分钟，钒的反萃率可达98%。反萃液中V和Fe的浓度分别为13.0g/L和3.9g/L。经氧化、沉淀、焙烧得到纯度为99.2%的V2O5产品。V和Fe的总分离系数为200。实验结果表明，在氯化物溶液中，V(IV)也能与其他金属离子如Mg(II)、Ni(II)、Zn(II)、Ca(II)、Al(III)、Cu(II)分离。提出了从含钒高铁氯化物溶液中回收钒的工艺流程。
Vanadium (IV) bearing chloride solution with the Fe (II)/V (IV) mass ratio of 60 was prepared to simulate the acidic liquor by hydrochloric acid leaching of reduced vanadium-bearing titanomagnetite. Extractant of bis (2-ethylhexyl) phosphoric acid (D2EHPA) was used to extract vanadium from the solution. Under the optimal extraction conditions of equilibrium H+concentration of 0.27–0.42 mol/L, D2EHPA concentration (v/v, diluted in n-heptane) of 10%, extraction temperature of 20–25 °C, equilibrium time of 60 min, phase ratio (O/A) of 1:1, more than 99% of vanadium can be extracted. Loaded organic phase were stripped by dilute H2SO4solution under the optimal stripping conditions of H2SO4concentration of 20 wt.%, phase ratio (O/A) of 10:1, stripping time of 120 min, and 98% of vanadium can be stripped. The concentrations of V and Fe in the stripping solution were 13.0 g/L and 3.9 g/L, respectively. V2O5products with purity of 99.2% were obtained after oxidation, precipitation and calcination. The overall separation coefficient of V and Fe was 200. Experimental results indicated that V (IV) can be also separated from other metal ions such as Mg (II), Ni (II), Zn (II), Ca (II), Al (III) and Cu (II) in the chloride solution. A flow sheet on the recovery of vanadium from vanadium-bearing chloride solution containing high concentration of iron was proposed.