Semiempirical Model for the Solubility of Rare Earth Oxides in Molten Fluorides

Guo, Xiaoling; Sun, Zhi; Sietsma, Jilt; Yang, Yongxiang

doi:10.1021/acs.iecr.5b04892

Cited by 21 publications

(41 citation statements)

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“…aThe solubility was obtained from ref (22), and the density of the melt was calculated according to the data from ref (9). …”

Section: Results and Discussionmentioning

confidence: 99%

“…The previous research 22 shows that the relationship between solubility and temperature can be expressed aswhere x is a function related to the melt composition, and A is a positive constant in J/mol. For LiF-NdF 3 melt, 22 the Nd 2 O 3 solubility can be calculated via 22 where x i is the mole fraction of compound i in the original melt without dissolved Nd 2 O 3 .…”

Section: Results and Discussionmentioning

confidence: 99%

“…For LiF-NdF 3 melt, 22 the Nd 2 O 3 solubility can be calculated via 22 where x i is the mole fraction of compound i in the original melt without dissolved Nd 2 O 3 . It is easy to figure out that the Nd 2 O 3 solubility in LiF-NdF 3 increases with temperature.…”

Section: Results and Discussionmentioning

confidence: 99%

“…22 Its influence on the molar volume of the salts can be ignored. In this paper, the solution with dissolved Nd 2 O 3 will be treated as a quasi-binary salt system for density calculations.…”

Section: Results and Discussionmentioning

confidence: 99%

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Quantitative Study on Dissolution Behavior of Nd₂O₃in Fluoride Melts

Guo

Sun

Sietsma

et al. 2018

Ind. Eng. Chem. Res.

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The dissolution of rare earth oxides in molten fluorides is a critical step in the preparation of the corresponding rare earth metals by oxide-fluoride electrolysis. However, quantitatively understanding the nature of dissolution, especially in the case of molten salts, is usually difficult to be achieved by postmortem characterization. In this paper, the dissolution behavior of Nd2O3 particles in molten fluorides was studied via in situ observation with confocal scanning laser microscopy. Combining direct observation with thermodynamic analyses on the oxide dissolution, the rate-limiting step(s) and the effects of parameters like temperature, salt type, and composition on the dissolution rate are identified. This study provides a methodology to estimate the dissolution kinetics of rare earth oxides in molten fluorides during their primary and secondary processing.

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“…aThe solubility was obtained from ref (22), and the density of the melt was calculated according to the data from ref (9). …”

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Quantitative Study on Dissolution Behavior of Nd₂O₃in Fluoride Melts

Guo

Sun

Sietsma

et al. 2018

Ind. Eng. Chem. Res.

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“…In recent years, the solubility of REO in fluoride melts was widely researched [10][11][12][13][14][15][16][17][18][19][20][21]. It was found that the solubility was relatively low and the melts with high temperature and strong corrosiveness so that there were difficulties for accurate measuring the concentration of REO in fluoride melts.…”

Section: Introductionmentioning

confidence: 99%

Chemical titration method for Determination of Concentration of REO in Rare Earth Fluoride Melts

Zhu¹,

Sun²,

Liu³

et al. 2017

Proceedings of the 2017 International Conference on Material Science, Energy and Environmental Engineering (MSEEE 2017)

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Abstract. In the present study, chemical titration method for determination of concentration of REO in REF 3 -LiF-RE 2 O 3 melts was investigated. The melts with the composition of 40mol%REF 3 -60mol%LiF (RE=La and Nd) was taken as object for illustrating the measurement of concentration and solubility of REO by the chemical titration method. Then the changing of REO concentration in 40mol%REF 3 -60mol%LiF melts with electrolytic time in practical electrolysis production was studied. The concentration of REO decreases with the electrolytic time, and rate of the decreasing also declines with the electrolytic time. And the reasonable time interval for REO addition was recommended defining as 1.75 h which is very close to the empirical value 2 h, This would also illustrate the reliability of chemical titration method on determination of concentration of REO in the melts.

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Diffusion‐limited dissolution of spherical particles: A critical evaluation and applications of approximate solutions

et al. 2017

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The analytical and numerical description of the effective dissolution kinetics of spherical particles into a solvent is often difficult in chemical and metallurgical engineering. The crucial first step is to identify the dissolution mechanisms, and subsequently, relevant kinetics parameters can be calculated. In this article, three frequently used approximations, i.e., the invariant‐field (IF) (Laplace), reverse‐growth (RG), and invariant‐size (IS) (stationary‐interface) approximations, are systematically discussed and compared with numerical simulation results. The relative errors of the dissolution curves and total dissolution time of the three approximations to the numerical simulations are calculated. The results reveal the appropriate application ranges of the approximations for given precision levels. With further experimental validation, this research provides a methodology to properly assess dissolution kinetics and adequately estimate effective diffusion coefficients and activation energy under the experimental uncertainties. © 2017 American Institute of Chemical Engineers AIChE J, 63: 2926–2934, 2017

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Semiempirical Model for the Solubility of Rare Earth Oxides in Molten Fluorides

Cited by 21 publications

References 20 publications

Quantitative Study on Dissolution Behavior of Nd₂O₃in Fluoride Melts

Quantitative Study on Dissolution Behavior of Nd₂O₃in Fluoride Melts

Chemical titration method for Determination of Concentration of REO in Rare Earth Fluoride Melts

Diffusion‐limited dissolution of spherical particles: A critical evaluation and applications of approximate solutions

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Semiempirical Model for the Solubility of Rare Earth Oxides in Molten Fluorides

Cited by 21 publications

References 20 publications

Quantitative Study on Dissolution Behavior of Nd2O3in Fluoride Melts

Quantitative Study on Dissolution Behavior of Nd2O3in Fluoride Melts

Chemical titration method for Determination of Concentration of REO in Rare Earth Fluoride Melts

Diffusion‐limited dissolution of spherical particles: A critical evaluation and applications of approximate solutions

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Product

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Quantitative Study on Dissolution Behavior of Nd₂O₃in Fluoride Melts

Quantitative Study on Dissolution Behavior of Nd₂O₃in Fluoride Melts