Maintenance of the Metastable State and Induced Precipitation of Dissolved Neodymium (III) in an Na2CO3 Solution

Yang, Yanyan; Zhang, Xiaolin; Li, Kaizhong; Wang, Li; Niu, Fangyong; Liu, Donghui; Meng, Yuze

doi:10.3390/min11090952

Cited by 2 publications

(1 citation statement)

References 23 publications

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“…In this work, we use the MD method to study the CO 2− 3 coordination and hydration properties of Yb (III) by using the Materials Studio 8.0 [24] software. The SPC/E water model was used [25], and the radial distribution function (RDF) and coordination number in the carbonate solution system were calculated and analyzed [26].…”

Section: And Dft Calculationsmentioning

confidence: 99%

Molecular Dynamics Calculation of the Coordination Behavior of Yb (III) in Sodium Carbonate Solution

Lan,

Yang,

Xie

et al. 2023

Processes

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Yb (III) shows complex behavior of coordination dissolution and precipitation in carbonate solutions, but the properties of CO32− coordination and hydration to Yb (III) in the solution have not been explicated. In this work, the dissolution rule of Yb (III) with CO32− concentration has been studied. The radial distribution function and the coordination number of CO32− and H2O to Yb (III) were calculated by molecular dynamics simulation, and the complex ion form of Yb was obtained. The ultraviolet–visible spectrum and the ionic structures of Yb (III) complex ions were geometrically optimized and calculated by using density functional theory. Then, the experimental ultraviolet–visible spectra and density functional theory results were combined to verify the molecular dynamics calculations. The results indicate that Yb (III) undergoes precipitation in low-concentration carbonate solution, but, in high-concentration carbonate solution, Yb (III)’s carbonates will undergo dissolution. The main reason for the dissolution of Yb (III)’s carbonates is the coordination effect of CO32− on Yb (III); the coordination of carbonate on Yb (III) occurs with a CO32− concentration range of 0.4~2.0 mol·L−1. Yb (III) mainly exhibits [Yb·9H2O]3+ hydrated form in the aqueous solution, while, in the carbonate solution, [Yb·9H2O]3+ is converted into [Yb(CO3)2·5H2O]− complex. [Yb(CO3)2·5H2O]− complex is the main ionic form in high-concentration carbonate solutions. The analysis method in this work provides guidance for understanding the coordination and hydration characteristics of oxyacid radicals to rare earth elements.

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Section: And Dft Calculationsmentioning

confidence: 99%

Molecular Dynamics Calculation of the Coordination Behavior of Yb (III) in Sodium Carbonate Solution

Lan,

Yang,

Xie

et al. 2023

Processes

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Summary of the Research Progress on Advanced Engineering, Processes, and Process Parameters of Rare Earth Green Metallurgy

Li,

Zhang,

Dou

et al. 2024

Materials

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The addition of rare earth metals to aluminum alloys can effectively improve their corrosion resistance and has been widely used in the aerospace and military industries. However, the current methods for the preparation of rare earth metals involve long processing steps, high energy consumption, and high carbon emissions, which severely constrains the development of aluminum alloys. Its output is further developed. To this end, this paper reviews mainstream rare earth production processes (precipitation methods, microemulsion methods, roasting-sulfuric acid leaching methods, electrochemical methods, solvent extraction methods, and ion exchange methods) to provide basic information for the green smelting of rare earth metals and help promote the development of green rare earth smelting. Based on the advantages and disadvantages of each process as well as recent research results, the optimal process parameters and production efficiency were summarized. Studies have concluded that the precipitation method is mostly used for the recovery of rare earth elements and related valuable metals from solid waste; the microemulsion method is mostly used for the preparation of nanosized rare earth alloys by doping; the roasting-sulfuric acid leaching method is mostly used for the treatment of raw rare earth ores; and the molten salt electrolysis method is a more specific method. This is a green and environmentally friendly production process. The results of this study can provide direction for the realization of green rare earth smelting and provide a reference for improving the existing rare earth smelting process.

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Maintenance of the Metastable State and Induced Precipitation of Dissolved Neodymium (III) in an Na2CO3 Solution

Cited by 2 publications

References 23 publications

Molecular Dynamics Calculation of the Coordination Behavior of Yb (III) in Sodium Carbonate Solution

Molecular Dynamics Calculation of the Coordination Behavior of Yb (III) in Sodium Carbonate Solution

Summary of the Research Progress on Advanced Engineering, Processes, and Process Parameters of Rare Earth Green Metallurgy

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