Selective recovery of thorium and uranium from leach solutions of rare earth concentrates in continuous solvent extraction mode with primary amine N1923

Hùng, Nguyễn Duy; Thuan, Le Ba; Thanh, Tran Chi; Thuy, Nguyen Thanh; Tra, Doan Thi Thu; Khoai, Do Van; Watanabe, Masayuki; Minh, Phạm Quang; Than, Hoang Sy; Vượng, Nguyễn Đức; Dinh, Van‐Phuc; Lee, Jin Young; Jeon, Jong Hyuk; Jyothi, Rajesh Kumar

doi:10.1016/j.hydromet.2022.105933

Cited by 19 publications

(1 citation statement)

References 30 publications

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“…The solvent extraction process has been widely used to extract solubilized REEs in the acid leachate of bauxite residues due to its simplicity, rapidity, and applicability over various concentration ranges [21]. The organic extractants of neutral phosphorus [22,23], acidic phosphorus [23][24][25], carboxylic acids [26], and amines [27,28] have been intensively utilized in practical production for REEs extraction, which were exhibited in Table 1. Acidic phosphorus extractants were demonstrated to be the most commercial and have been widely applied.…”

Section: Introductionmentioning

confidence: 99%

Distinct Extraction Behaviors of La/Ce and Sc/Y in the Phosphoric Acidic Leachate of Bauxite Residues and Their Sequential Extraction with Di-(2-Ethylhexyl) Phosphoric Acid as Extractant

Li,

Deng,

Yao

et al. 2023

Minerals

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Bauxite residue is a hazardous solid waste produced in the alumina production process and has also become a significant rare earth resource. The extraction behaviors of La, Ce, Sc and Y solubilized in the phosphoric acidic leachate of bauxite residue were investigated in this study with di-(2-ethylhexyl) phosphoric acid as the extractant. With a relatively low concentration of 2% at an aqueous solution pH of 1.5, 90% Sc and 98% Y were extracted by di-(2-ethylhexyl) phosphoric acid. Less than 5% La and Ce and impurities of Fe, Al, Ti and Ca were extracted in this situation. As the concentration of di-(2-ethylhexyl) phosphoric acid increased to 20%, almost all the Sc and Y were extracted and the extraction ratios of La and Ce were 87% and 95%, respectively. A good separation of REEs against impurities was simultaneously obtained in the solvent extraction process and their separation coefficients were much higher than 1. A stepwise extraction process was proposed and established to extract Sc/Y and La/Ce sequentially from the phosphoric acidic leachate. It was further revealed that the Sc and Y in the acidic leachate were extracted by di-(2-ethylhexyl) phosphoric acid through an ion exchange process, and that the extraction of La and Ce was due to an antagonistic process where both an ion exchange reaction and a solvation reaction occurred.

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Section: Introductionmentioning

confidence: 99%

Distinct Extraction Behaviors of La/Ce and Sc/Y in the Phosphoric Acidic Leachate of Bauxite Residues and Their Sequential Extraction with Di-(2-Ethylhexyl) Phosphoric Acid as Extractant

Li,

Deng,

Yao

et al. 2023

Minerals

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Solvent extraction of uranium from leach liquor using dibutyl carbitol: optimization of parameters by response surface methodology

Dehghan,

Khamseh,

Ghadiri

2024

J Radioanal Nucl Chem

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Maximizing the Processing of Polymetallic Concentrates via Actinide Separation and Rare Earth Retrieval

Eliwa,

Mubark,

Gawad

et al. 2024

Mining, Metallurgy & Exploration

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During the last decades, the growing demand for rare earth elements (REEs) has led to numerous recent studies to recover these elements from various bearing ores and wastes. Therefore, the recovery of REEs from Ras Baroud polymetallic concentrate has been investigated in the current study. Physical beneficiation for the Ras Baroud pegmatite sample was carried out, yielding a concentrate for euxenite (Y), fergusonite (Y), xenotime (Y), monazite (Ce), allanite, thorite, uranothorite, and Hf-zircon, which resulted in raising the concentrations of rare earth elements, Th, Zr, U, and Ti in the sample. Fusion digestion processes with sodium hydroxide were studied using the Conceived Predictive Diagonal (CPD) technique. The three experimental digestion groups proved the dissolution of 99.9, 95.6, 99.9, 52.5, and 0.47% for REEs, Th, U, Ti, and Zr, respectively, under fusion conditions of 723 K, 120 min, 1/1.5 ore/alkali ratio, and − 100-μm particle sizes. Fusion kinetics, isotherms, and thermodynamics were investigated using several suggested models, namely, pseudo reversible first order, uptake general model, and shrinking core model which matched well with the experimental digestion results. Selective recovery of actinide content from REE content of the digested concentrate chloride solutions was accomplished using solvent extraction with di-2-ethyl hexyl phosphoric acid. About 99.9, 99.9, and 4.2% extraction efficiencies for Th, U, and REEs were performed, respectively, using 0.3 mol/L solvent concentration in kerosene as a diluent, 1/2 organic to aqueous ratio, an aqueous pH of 0.2, and 15-min contact time. Thorium and uranium ions were stripped with sulfuric acid solution 2.5 mol/L with 94 and 98% stripping efficiency, respectively. A highly purified REE precipitate was obtained from the raffinate solutions. Zircon mineralization tailings were obtained as a by-product through the alkaline digestion process.

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Selective recovery of thorium and uranium from leach solutions of rare earth concentrates in continuous solvent extraction mode with primary amine N1923

Cited by 19 publications

References 30 publications

Distinct Extraction Behaviors of La/Ce and Sc/Y in the Phosphoric Acidic Leachate of Bauxite Residues and Their Sequential Extraction with Di-(2-Ethylhexyl) Phosphoric Acid as Extractant

Distinct Extraction Behaviors of La/Ce and Sc/Y in the Phosphoric Acidic Leachate of Bauxite Residues and Their Sequential Extraction with Di-(2-Ethylhexyl) Phosphoric Acid as Extractant

Solvent extraction of uranium from leach liquor using dibutyl carbitol: optimization of parameters by response surface methodology

Maximizing the Processing of Polymetallic Concentrates via Actinide Separation and Rare Earth Retrieval

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