Chinese Journal of Applied Chemistry ›› 2020, Vol. 37 ›› Issue (7): 803-809.DOI: 10.11944/j.issn.1000-0518.2020.07.190356

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Selective Extraction of Vanadium from the Fe-Bearing Acidic Solution by Method of “Depressing Extraction-Extraction”

YANG Zhengfeia, CHEN Youshuna, ZHANG Haojiea, LIU Zhixionga, YAN Wenbina,b,c, LI Feia,b,c,*   

  1. aSchool of Chemistry and Chemical Engineering; bThe Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technologythe 2011 Plan of Hunan Province; cKey Laboratory of Mineral Cleaner Production and Exploit of Green Functional Materials in Hunan Province,Jishou University,Jishou,Hunan 416000,China
  • Published:2020-07-01 Online:2020-07-07
  • Contact: LI Fei, associate professor; E-mail:113501005@csu.edu.cn; Research interests:hydrometallurgy and separation of similar elements
  • Supported by:
    Supported by the Foundation of Educational Commission of Hunan Province(No.18B320), the Foundation of the Collaborative Innovation Center of Manganese-Zinc-Vanadium Industrial Technology(the 2011 Plan of Hunan Province), the Research Startup Foundation of Jishou University(No.jsdxrcyjkyxm201701)

Abstract: The extraction of vanadium from stone coal by acid leaching has attracted much attention because of its characteristic of environment friendly and high metal yield. However, the process is seriously affected by concentrated Fe3+ in the vanadium mother solution. In this paper, a system (P507(2-ethylhexylphosphonic acid mono-(2-ethylhexyl) ester)+N235(Trioctyl/tridecylaklylamines)+sulfonated kerosene) based on the “depressing extraction-extraction” effect was proposed to separate V from Fe. The influence of various factors on the separation and enrichment of V over Fe was studied in details. Results show that P507 is responsible for extraction of Fe and V, while N235 suppresses the extraction of Fe3+. The higher the concentration of N235, the less Fe3+ is extracted. The separation efficiency of V over Fe is high in the raw solution at pH≤0.4, demonstrating the applicability of the designed “depressing extraction-extraction” mixed extractants toward concentrated acid leaching solution. When 6 mol/L ammonia is used, more than 99% of vanadium can be stripped. Under the condition of 25 ℃, V(organic phase)∶V(aqueous phase)=2∶1 the stripping pregnant solution is obtained, in which the mass concentration of vanadium is 14.73 g/L, the mass concentration of iron is less than 0.022 g/L, and the mass ratio of vanadium to iron is more than 669.5. It is evident that the “depressing extraction-extraction” is a method of easy operation, being economic and efficient, and great industrial prospect.

Key words: solvent extraction, depressing extraction, separation of vanadium over iron, pseudo-stripping, ammonium vanadate