Optimal V2O3 extraction by sustainable vanadate electrolysis in molten salts

Feng, Bao-Yan; Zhong-hua, Zhao; Jia, Yongzheng; An, Jia-Liang; Wang, Mingyong

doi:10.1007/s42864-023-00204-6

Cited by 7 publications

(4 citation statements)

References 30 publications

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“…Transition vanadates have been extensively studied over the past several years owing to their environmental affinity, unique crystal structure, and cost-effective fabrication. [1][2][3][4][5][6][7][8][9][10] Among them, Ca 3 (VO 4 ) 2 , exhibiting a whitlockite-type structure, has attracted considerable interest as a potential candidate for applications such as ferroelectric, laser host, and optical materials. For example, the single crystals of Ca 3 (VO 4 ) 2 were grown using the Czochralski method.…”

Section: Introductionmentioning

confidence: 99%

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

Pei,

Jiao,

et al. 2024

J Am Ceram Soc.

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Ca3(VO4)2 is a promising candidate for applications in ferroelectric, laser host, and optical materials owing to its unique whitlockite structure and excellent physicochemical properties. In this study, the Ca3(VO4)2 powder was fabricated via a conventional solid‐phase route in air, using V2O5 and CaO as precursors. The trigonal Ca3(VO4)2 belongs to the space group R3c, having unit cell parameters of a = 10.8074 Å, b = 10.8074 Å, and c = 37.98871 Å, respectively. Ca3(VO4)2 melts congruently at 1680 K, as determined from differential scanning calorimetry measurements of the thermal profile of the second heating test. Enthalpy changes in Ca3(VO4)2 were experimentally determined for the first time across temperatures between 573 and 1623 K by drop calorimetry. The temperature‐dependent molar heat capacity of Ca3(VO4)2 was calculated from the enthalpy changes at elevated temperatures. Thermodynamic properties (entropy, enthalpy, and Gibbs free energy changes) were also calculated. The thermodynamic properties measured in this study were further applied to evaluate the appropriate precursors for fabricating Ca3(VO4)2 via solid‐state calcination. The results strongly recommend the use of V2O5 and Ca(OH)2 precursors for preparing the Ca3(VO4)2 samples because of their thermodynamic advantages.

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Section: Introductionmentioning

confidence: 99%

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

Pei,

Jiao,

et al. 2024

J Am Ceram Soc.

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“…Multicomponent transition metal oxides (TMOs) have attracted widespread attention as the most promising candidate materials for advanced technological applications in contrast with their counterbinary oxides [1][2][3][4]. The enhancement in the performance is due to the presence of two metals in these double oxide species, which render additional redox reactions during the device operation.…”

Section: Introductionmentioning

confidence: 99%

The phase structure, transitions, and non-isothermal crystallization kinetics of Zn₂V₂O₇ glass

Li,

Pei,

Jiao

et al. 2024

J. Phys.: Conf. Ser.

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The Zn2V2O7 glass was prepared by solid-state reaction using the initial reactant ZnO and V2O5 powder. X-ray diffraction was employed to characterize the phase composition of the as-prepared Zn2V2O7 powder. The crystallization kinetics of Zn2V2O7 glass prepared by solid-state reaction was studied using differential thermal analysis under non-isothermal conditions. It was established that the crystallization process of Zn2V2O7 can be divided into two steps, which is controlled first by a Disc-like with kinetic equation G(α)=[-ln(1-α)]1/3 and then by a Fibril-type growth type with kinetic equation G(α)=[1-(1-α)1/3]1/2 . The apparent activation energy calculated by different methods (Kissinger method, Ozawa method, Tang method, and Starink method) under non-isothermal conditions were similar, varying between 335.6 kJ·mol−1 and 371.6 kJ·mol−1, and the average apparent activation energy was equal to 362.2 kJ·mol−1.

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“…The molten salt electrolysis process is widely employed for the preparation of different reactive metal elements and their alloys due to its advantages of high product purity, low cost, and easy implementation of continuous operation. Currently, rare earth metals and their alloys are primarily produced through the molten salt electrolysis process under fluoride system (REF3-LiF-RE2O3) or chloride system (RECl3) (Sun et al, 2022;Yang et al, 2019;Feng et al, 2023;Gu et al, 2017;Chen et al, 2021;Lai et al, 2023). Presently, considering the benefits of a more stable electrolyte composition with better hydrolysis resistance, higher current efficiency and rare earth yield along with being more environmentally friendly; the fluoride molten salts system (REF3-LiF-RE2O3) is more commonly used in rare earth metal molten-salt electrolytic processes compared to the RECl3 system Liu et al, 2023;Liang et al, 2018;Prince et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Recovery of rare earths and lithium from rare earth molten salt electrolytic slag by lime transformation, co-leaching and stepwise precipitation

Li,

Luo,

Liu

et al. 2024

Physicochem. Probl. Miner. Process.

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The rare earth molten salt electrolytic slag (REMSES) has recently attracted significant attention due to its potential environmental hazards and high content of rare earths and lithium, leading to a surge in recycling efforts. In this study, we propose and demonstrate a novel and straightforward process for the simultaneous extraction of rare earths and lithium from REMSES through lime transformation and sulfuric acid leaching at low temperatures. Firstly, during the lime transformation process, REMSES is converted into hydroxides that can be easily dissolved in acids. Secondly, REEs and Li present in the slag are co-extracted using a conditional sulfuric acid leaching method, resulting in 95.72% REEs leaching efficiency and 99.41% Li leaching efficiency under optimal conditions. Finally, REEs and Li in the solution are precipitated using oxalic acid and trisodium phosphate with precipitation efficiencies of 99.02% for REEs and 94.85% for Li respectively. This innovative process enables the conversion of REEs and lithium from REMSES into high-purity products (a mixture of REOs with 99.31% purity; Li<sub>3</sub>PO<sub>4</sub> with 98.93% purity), thereby facilitating their valuable utilization.

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Optimal V2O3 extraction by sustainable vanadate electrolysis in molten salts

Cited by 7 publications

References 30 publications

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

The phase structure, transitions, and non-isothermal crystallization kinetics of Zn₂V₂O₇ glass

Recovery of rare earths and lithium from rare earth molten salt electrolytic slag by lime transformation, co-leaching and stepwise precipitation

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Optimal V2O3 extraction by sustainable vanadate electrolysis in molten salts

Cited by 7 publications

References 30 publications

High‐temperature phase transformation and thermodynamic properties of Ca3(VO4)2

High‐temperature phase transformation and thermodynamic properties of Ca3(VO4)2

The phase structure, transitions, and non-isothermal crystallization kinetics of Zn2V2O7 glass

Recovery of rare earths and lithium from rare earth molten salt electrolytic slag by lime transformation, co-leaching and stepwise precipitation

Contact Info

Product

Resources

About

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

High‐temperature phase transformation and thermodynamic properties of Ca₃(VO₄)₂

The phase structure, transitions, and non-isothermal crystallization kinetics of Zn₂V₂O₇ glass