Thermodynamics of vanadium-iron separation of V(V)-Fe(III)-F-H2O system for fluorine-containing acid leaching solution of stone coal

被引：0
作者：
Lai Y. [1 ,2 ,3 ,4 ]
Yang X. [1 ,2 ,3 ]
Sun J. [1 ,2 ,3 ]
Shang H. [1 ,2 ,3 ,4 ]
Mo X. [1 ,2 ,3 ]
Wen J. [1 ,2 ,3 ,4 ]
机构：
[1] National Engineering Research Center for Environment-friendly Metallurgy in Producing Premium Non-ferrous Metals, China GRINM Group Co. Ltd., Beijing
[2] GRINM Resources and Environment Tech. Co. Ltd., Beijing
[3] GRIMAT Engineering Institute Co. Ltd., Beijing
[4] General Research Institute for Nonferrous Metals, Beijing
来源：
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2023年 / 54卷 / 05期
关键词：
anionic extractant; pH[!sub]50%[!/sub; stone coal; thermodynamic equilibrium; V(V)-Fe(III)-F-H[!sub]2[!/sub]O system;
D O I：
10.11817/j.issn.1672-7207.2023.05.005
中图分类号：
学科分类号：
摘要：
Aiming at the separation of vanadium and iron in fluoric acid leaching solution of stone coal, the thermodynamic equilibrium diagram of V(V)-Fe(III)-F-H2O system at 298.15 K was calculated and drawn, and the changes of vanadium ion and iron ion with total vanadium concentration, total iron concentration and total fluorine concentration were analyzed. The results show that with the increase of pH from 0 to 3.00, vanadium-containing species change from cations to anions and iron-containing species change from cations to neutral molecules due to the coordination of fluoride ions with V O 2 + and Fe3+. At this time, effective separation of vanadium and iron can be achieved. The pH of pH50% is defined as 50% mole fraction of vanadium anion. The increase of total vanadium concentration and total iron concentration in the solution all lead to increase in pH50%, increase in total fluorine concentration, and decrease in pH50%. When N235 anionic extractant is used to separate ferrovanadium from fluorine-containing solution, the pH of solution extraction increases and the separation coefficient βV/Fe increases with the total vanadium 0.05 mol/L, total iron 0.05 mol/L and total fluorine 0.50 mol/L. When the pH is 1.97, the separation coefficient of ferrovanadium can reach 122.86, and ferrovanadium can be separated effectively, which is consistent with the results of thermodynamic analysis. © 2023 Central South University of Technology. All rights reserved.
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页码：1703 / 1712
页数：9
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