Solubility of rare earth oxides in chloride, chloride-fluoride and fluoride melts of alkali and alkaline earth metals

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This paper presents a review of data on the solubility of rare earth oxides in halide melts of alkali and alkaline earth metals. The highest solubility of rare earth oxides is observed in fluoride melts, the lowest – in chloride melts. There are very few works devoted to the study of the solubility of rare earth oxides in mixed chloride-fluoride melts. The solubility of rare earth oxides decreases in the series La-Ce-Pr-Nd-Gd. The greatest number of works are devoted to the study of the solubility of neodymium, lanthanum and cerium oxides. There are practically no data on the solubility of “heavy” rare earth oxides (from Tb to Lu) in halide melts.

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Sobre autores

S. Zhuk

Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences

Autor responsável pela correspondência
Email: zhuk@ihte.ru
Rússia, Yekaterinburg

M. Vlasov

Institute of High-Temperature Electrochemistry, Ural Branch of the Russian Academy of Sciences

Email: zhuk@ihte.ru
Rússia, Yekaterinburg

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2. 1. Dependence of the content of neodymium and cerium in the LiCl-Li2O melt on the concentration of lithium oxide.

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3. Fig. 2. Dependence of the content of REM in the melt upon the combined dissolution of oxides of the corresponding REM in the melt LiCl-Li2O.

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4. Fig. 3. Sections of phase diagrams for melts: a) GdCl3–Gd2O3 and b) GdCl3–KCl–Gd2O3.

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5. 4. Dependence of the neodymium content in melts of mixtures of halides saturated with neodymium oxide on the reverse temperature.

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6. Fig. 5. Influence of temperature on the content of REM in CaCl2-based melts (80mol.%)-CaF2(20 mol.%).

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7. 6. Dependence of the solubility of yttrium oxide in LiCl-YF3-based melts.

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8. 7. Dependence of the solubility of lanthanum oxide and neodymium oxide in REF3-LiF melts (RE=La and Nd) on the content of lanthanum and neodymium fluoride, respectively.

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9. 8. Dependence of solubility of oxides of holmium (1), samarium (2) and lanthanum (3) on temperature in melts of LiF-ZrF4 (a), NaF-ZrF4 (b) and KF-ZrF4 (c).

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10. 9. Dependence of the solubility of neodymium oxide in the melt NdF3-LiF-MgF2 depending on the content of magnesium fluoride in the melt: 1 – 15 mol.% NdF3 at 1073 K, 2 – 15 mol.% NdF3 at 1133 K, 3 – 30 mol.% NdF3 at 1133 K.

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11. Fig. 10. Sections of phase diagrams of mixtures of melts of alkali metal fluorides with lanthanum oxide.

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12. 11. The result of the analysis of literature data on the solubility of REE oxides in halides.

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