Compound leaching of rare earth from the ion-adsorption type rare earth ore with magnesium sulfate and ascorbic acid

Fuguo, Lai; Gao, Guohua; Li, Huang; Xiao, Yanfei; Run, Yang; Li, Kaizhong

doi:10.1016/j.hydromet.2018.05.027

Cited by 44 publications

(7 citation statements)

References 25 publications

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“…The obtained bidentate coordination mode is also consistent with the conclusion reached by Martelli [20]. With the CO 2− 3 concentration increasing, the reaction of Equation ( 13) is promoted in the positive direction [42], increasing the solubility of Yb (III) in a high-concentration sodium carbonate solution, resulting in excessive RE loss during the precipitation process of rare earth carbonate [43,44]. In high-concentration carbonate solutions, due to the coordination effect of CO 2− 3 on Yb (III), the result is that rare earth carbonates undergo dissolution.…”

Section: Structure and Uv Spectrum Of Dft Calculationssupporting

confidence: 87%

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: Structure and Uv Spectrum Of Dft Calculationssupporting

confidence: 87%

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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“…A large amount of ammonia-nitrogen or high salinity wastewater is generated by using the traditional rare-earth separation methods, such as solvent extraction and ion exchange, 1,2 which has been causing trouble to the healthy development of the rare-earth industry. Some new rare-earth separation methods, such as the nonsaponification, saponified, coordination extraction, and ionic liquid extraction, 3−6 have some effects, but they are costly and difficult to resolve wastewater problems.…”

Section: Introductionmentioning

confidence: 99%

Metastable Dissolution Regularity of Nd³⁺ in Na₂CO₃ Solution and Mechanism

Yang

Zhang

et al. 2019

ACS Omega

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The carbonate solution-dissolved rare earth showed some metastable chemical characteristics. In this paper, the systematic investigation of metastable dissolution regularity of Nd 3+ in Na 2 CO 3 solution was carried out. The results showed that Nd 3+ has an instantaneous saturated solubility in Na 2 CO 3 solution. When the amount of the dissolution Nd 3+ did not reach the instantaneous saturated solubility, the solution was in a stable-state period. Once the concentration of Nd 3+ exceeded the instantaneous saturated solubility, the solution was no longer in the metastable state and generated the neodymium double salt of carbonate precipitates rapidly. The molecular dynamics simulation of the solution in the metastable state was carried out. In high concentration Na 2 CO 3 solution, dissolved Nd 3+ had a coordination reaction with the CO 3 2– . Also, there was a stronger interaction between Na + and CO 3 2– , which caused the effective concentration of free CO 3 2– which could react with Nd 3+ to become lower. Thus, these reasons make the solution exhibit a metastable state. In that metastable period, the dissolved Nd 3+ becomes steady and hard to generate the neodymium double salt of carbonate precipitates.

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“…The REE speciation in ion-adsorption rare earth tailings is commonly divided into four groups, including the water-soluble, ion-exchangeable, Fe–Mn oxide-bound, and mineral species . The low leaching efficiency during the ion-exchange process might result from the non-exchangeable REEs, especially the Fe–Mn–Ce oxide-bound components. − Among all REEs, Ce is the only element that can exist in the tetravalent state in nature . Oxidation of Ce(III) to Ce(IV) commonly occurs in the weathering process, and it is typically associated with the dissolution/precipitation, resulting in the formation of Fe–Mn–Ce oxide-bound components with low solubility and mobility .…”

Section: Introductionmentioning

confidence: 99%

Insights into the Selective Transformation of Ceria Sulfation and Iron/Manganese Mineralization for Enhancing the Selective Recovery of Rare Earth Elements

Zhou

Xiao

Guo

et al. 2023

Environ. Sci. Technol.

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To cope with the urgent and unprecedented demands for rare earth elements (REEs) in sophisticated industries, increased attention has been paid to REE recovery from recycled streams. However, the similar geochemical behaviors of REEs and transition metals often result in poor separation performance due to nonselectivity. Here, a unique approach based on the selective transformation between ceria sulfation and iron/ manganese mineralization was proposed, leading to the enhancement of the selective separation of REEs. The mechanism of the selective transformation of minerals could be ascribed to the distinct geochemical and metallurgical properties of ions, resulting in different combinations of cations and anions. According to hardsoft acid-base (HSAB) theory, the strong Lewis acid of Ce(III) was inclined to combine with the hard base of sulfates (SO 4 2− ), while the borderline acid of Fe(II)/Mn(II) prefers to interact with oxygen ions (O 2-). Both in situ characterization and density functional theory (DFT) calculation further revealed that such selective transformation might trigger by the generation of an oxygen vacancy on the surface of CeO 2 , leading to the formation of Ce 2 (SO 4 ) 3 and Fe/Mn spinel. Although the electron density difference of the configurations (CeO 2−x -SO 4 , Fe 2 O 3−x -SO 4 , and MnO 2−x -SO 4 ) shared a similar direction of the electron transfer from the metals to the sulfate-based oxygen, the higher electron depletion of Ce (Q Ce = −1.91 e) than Fe (Q Fe = −1.66 e) and Mn (Q Mn = −1.64 e) indicated the higher stability in the Ce−O−S complex, resulting in the larger adsorption energy of CeO 2−x -SO 4 (−6.88 eV) compared with Fe 2 O 3−x -SO 4 (−3.10 eV) and MnO 2−x -SO 4 (−2.49 eV). This research provided new insights into the selective transformation of REEs and transition metals in pyrometallurgy and thus offered a new approach for the selective recovery of REEs from secondary resources.

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Compound leaching of rare earth from the ion-adsorption type rare earth ore with magnesium sulfate and ascorbic acid

Cited by 44 publications

References 25 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

Metastable Dissolution Regularity of Nd³⁺ in Na₂CO₃ Solution and Mechanism

Insights into the Selective Transformation of Ceria Sulfation and Iron/Manganese Mineralization for Enhancing the Selective Recovery of Rare Earth Elements

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Compound leaching of rare earth from the ion-adsorption type rare earth ore with magnesium sulfate and ascorbic acid

Cited by 44 publications

References 25 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

Metastable Dissolution Regularity of Nd3+ in Na2CO3 Solution and Mechanism

Insights into the Selective Transformation of Ceria Sulfation and Iron/Manganese Mineralization for Enhancing the Selective Recovery of Rare Earth Elements

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Metastable Dissolution Regularity of Nd³⁺ in Na₂CO₃ Solution and Mechanism