Progress in green and efficient enrichment of rare earth from leaching liquor of ion adsorption type rare earth ores

He, Qiang; Qiu, Jiang; Chen, Jinfa; Zan, Miaomiao; Xiao, Yanfei

doi:10.1016/j.jre.2021.09.011

Cited by 67 publications

(11 citation statements)

References 52 publications

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“…However, in a reverse drop process, due to the large amount of urea and the high pH, the free OH − may promote the formation of the precipitate. [ 12 ] Therefore, the reaction and formation of yttrium carbonate in a positive drop reaction is less and slower than that in the reverse drop process, as a result, the particle size and size distribution of yttrium carbonate obtained from a positive drop reaction is larger and more uniform than that from a reverse drop route. Therefore, positive mixing approach is adopted for the following investigations.…”

Section: Resultsmentioning

confidence: 99%

Size‐Controllable Synthesis of Submicro Spherical Yttrium Carbonate and In Situ Doping of Europium to Prepare Y₂O₃: Eu³⁺ Phosphor

Zhou

Zhang

Murali

et al. 2023

Physica Status Solidi (a)

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Herein, size‐controllable spherical yttrium carbonate powders with D50 in range from 225 to 743 nm are synthesized from Y(NO3)3·6H2O and urea. With the rise of the concentration ratio of urea/Y3+, temperature, and extension of aging time, diameter of yttrium carbonate spheres increases. When the urea/Y3+ is 40: 1 and ages for 4 h at 90 °C, the D50 of synthesized powder, which has been determined as Y(OH)CO3·1.3H2O, has the largest D50 of 743 nm with (D90–D10)/2D50 of 0.22. After decomposition, the D50 of formed Y2O3 decreases to 632 nm, the (D90–D10)/2D50 is 0.24, and the D50 of Y2O3 is in the range of 126–632 nm. Then, 6 mol. % Eu3+ is homogeneously doped into Y(OH)CO3·1.3H2O and Y2O3: Eu3+ spherical powder is obtained after roasting, which exhibits a strong emission peak at 613 nm. The developed synthetic method and the obtained size‐controllable spherical Y(OH)CO3·1.3H2O, Y2O3, and Y2O3: Eu3+ with a uniform size distribution own various potential applications.

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Section: Resultsmentioning

confidence: 99%

Size‐Controllable Synthesis of Submicro Spherical Yttrium Carbonate and In Situ Doping of Europium to Prepare Y₂O₃: Eu³⁺ Phosphor

Zhou

Zhang

Murali

et al. 2023

Physica Status Solidi (a)

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“…This implies an exponential growth in the market demand for rare earth products. 1,2 Therefore, the preparation methods of rare earth elements that can meet the demand for rare earth resources have been attracting attention. 3,4 At this stage, various rare earth preparation methods (ion exchange method and solvent extraction method, etc.)…”

Section: ■ Introductionmentioning

confidence: 99%

Electrochemical Behavior and Preparation of La–Ni Alloy in LaF₃–LiF-CaF₂-La₂O₃ Molten Salt on Nickel Electrode

Pan,

Yan,

Deng

et al. 2024

J. Phys. Chem. C

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Electrolyte is considered to be one of the key factors affecting electrolysis in the rare earth and their alloys industry. Generally, the fluoride system is chosen as the electrolyte for industrial production. However, the molten salt electrolysis method for fluoride-oxide systems is not well understood and has not been systematically studied at this stage. In order to supplement this part, lanthanum (La) ions have been chosen as the research object in this paper to systematically investigate the preparation of La−Ni alloy from LaF 3 −LiF-CaF 2 −La 2 O 3 molten salt. A series of electrochemical methods were used to investigate the mechanism and kinetic properties of La(III) reduction on W and Ni electrodes. The electrochemical reduction properties and kinetic parameters of La were obtained. La−Ni alloy was prepared by potentiostatic electrolysis, and it was verified by detailed analysis through characterization methods. On this basis, LaNi 5 intermetallic compound was successfully prepared on Ni electrode. This study provides valuable theoretical guidance for the development of La alloy preparation with fluoride salt systems in industry.

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“…Ammonia-nitrogen pollution in groundwater caused by REE mining is becoming increasingly serious due to inappropriate mining methods [10]. Therefore, many researchers have tried to intensify the leaching process of rare earth [11] and develop methods to prevent and control ammonia-nitrogen pollution caused by rare earth mining [12]. Gong et al [13] proposed the use of a modified soil-bentonite barrier for ammonia-nitrogen pollution control in ion-adsorbed rare earth mining areas and studied its barrier benefits.…”

Section: Introductionmentioning

confidence: 99%

Simulation Study on the Environmental Impact of Rare Earth Ore Development on Groundwater in Hilly Areas: A Case Study in Nuodong, China

Shan

et al. 2023

Water

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Mineral extraction can significantly affect the groundwater flow and hydrochemical environment. However, for hilly areas, significant ground elevation changes and complex geological conditions make it difficult to accurately analyze and predict the impact of mineral mining. This study takes the Nuodong rare earth mining area as an example. Based on field investigations and experiments, GOCAD software (version 2022) was used to establish a geological model in combination with GMS numerical simulation software, which was used to build a groundwater flow model and a solute transport model. The flow model in the hilly area indicated that the absolute error between the simulated and measured water levels of each observation well is 0.554 m. The solute-transport model showed that the maximum pollutant concentration of ammonia-nitrogen (NH3-N) in the liquid injection area, stream area, and village area monitoring wells reaches 139.15, 27.9, and <0.5 mg/L, respectively. During the mining period, streams in the area are affected by NH3-N, which threatens the safety of the water for mine area residents. To control pollutant transport, two stages of pumping were adopted to reduce NH3-N concentrations in groundwater. After adopting the first stage, the peak concentration of the stream area monitoring wells decreased significantly, with the maximum peak concentration decreasing from 27.9 mg/L to 5.51 mg/L. Based on the results of the first stage of the pump-out treatment, a second stage was adopted. The model results showed that the peak concentration of NH3-N pollutants discharged into the stream is less than 0.5 mg/L. The results provide a theoretical basis and reference for groundwater monitoring and pollution control after mining in this area.

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Progress in green and efficient enrichment of rare earth from leaching liquor of ion adsorption type rare earth ores

Cited by 67 publications

References 52 publications

Size‐Controllable Synthesis of Submicro Spherical Yttrium Carbonate and In Situ Doping of Europium to Prepare Y₂O₃: Eu³⁺ Phosphor

Size‐Controllable Synthesis of Submicro Spherical Yttrium Carbonate and In Situ Doping of Europium to Prepare Y₂O₃: Eu³⁺ Phosphor

Electrochemical Behavior and Preparation of La–Ni Alloy in LaF₃–LiF-CaF₂-La₂O₃ Molten Salt on Nickel Electrode

Simulation Study on the Environmental Impact of Rare Earth Ore Development on Groundwater in Hilly Areas: A Case Study in Nuodong, China

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Progress in green and efficient enrichment of rare earth from leaching liquor of ion adsorption type rare earth ores

Cited by 67 publications

References 52 publications

Size‐Controllable Synthesis of Submicro Spherical Yttrium Carbonate and In Situ Doping of Europium to Prepare Y2O3: Eu3+ Phosphor

Size‐Controllable Synthesis of Submicro Spherical Yttrium Carbonate and In Situ Doping of Europium to Prepare Y2O3: Eu3+ Phosphor

Electrochemical Behavior and Preparation of La–Ni Alloy in LaF3–LiF-CaF2-La2O3 Molten Salt on Nickel Electrode

Simulation Study on the Environmental Impact of Rare Earth Ore Development on Groundwater in Hilly Areas: A Case Study in Nuodong, China

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Size‐Controllable Synthesis of Submicro Spherical Yttrium Carbonate and In Situ Doping of Europium to Prepare Y₂O₃: Eu³⁺ Phosphor

Size‐Controllable Synthesis of Submicro Spherical Yttrium Carbonate and In Situ Doping of Europium to Prepare Y₂O₃: Eu³⁺ Phosphor

Electrochemical Behavior and Preparation of La–Ni Alloy in LaF₃–LiF-CaF₂-La₂O₃ Molten Salt on Nickel Electrode