Thermodynamic investigation into extraction of cerium(III) by tributyl phosphate from phosphoric acid solutions

被引：0
|
作者：
O. V. Cheremisina
V. V. Sergeev
D. E. Chirkst
T. E. Litvinova
机构：
[1] National Mineral Resources University (Mining University),
来源：
Russian Journal of Non-Ferrous Metals | 2015年 / 56卷
关键词：
rare earth metals (REMs); cerium; extraction; phosphoric acid systems; tributyl phosphate; salting-out agent; solvate number; Raman spectra; thermodynamic investigation into extraction; extraction phosphoric acid (EPA);
D O I：
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中图分类号：
学科分类号：
摘要：
A mechanism of extraction of cerium by tributyl phosphate (TBP) from phosphate solutions using model and production solutions containing, %: 26–28 P2O5, 1.2–2.8 SO3, 0.3–0.8 CaO, 0.1–0.4 Al2O3, 0.3–0.4 Fe2O3, and 0.09–0.1 REE(NO3)3 is investigated. The model solution of phosphoric acid corresponds to the industrial solution of extraction phosphoric acid (EPA) by the content of P2O5 and Ce(NO3)3 and value of pH (0.6). Dependences of extraction parameters on the TBP concentration in o-xylene and concentration of nitrate ions introduced by magnesium and calcium nitrates, which are used as a salting-out agent, are found. The composition of the extracted organic complex of cerium Ce(H2PO4)(NO3)2TBPorg is determined. A constant of extraction equilibrium and the Gibbs energy of extraction are calculated. It is concluded by the results of the experiment that it is unreasonable to use TBP to extract Ce from phosphoric acid systems without introducing a considerable amount of the salting-out agent.
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页码：615 / 621
页数：6
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