Separation of rare earths by solvent extraction using DEHPA

Nascimento, Marisa; Valverde, Bianca Manhães; Ferreira, F.; Gomes, Rafael de Carvalho; Soares, Paulo Sergio Moreira

doi:10.1590/0370-44672015680140

Cited by 11 publications

(4 citation statements)

References 12 publications

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“…www.nature.com/scientificreports/ The extraction behaviour of these REEs (Dy, Tb and Nd) under studied temperature condition are promising and consistent with a significant increase in extraction efficiency. This extraction behaviour was strongly supported by the obtained thermodynamics results of this investigation as well as earlier works investigated related to the REEs extraction using various extractants [30][31][32] .…”

Section: Effect Of Diluentssupporting

confidence: 87%

Environmentally friendly comprehensive hydrometallurgical method development for neodymium recovery from mixed rare earth aqueous solutions using organo-phosphorus derivatives

Ruiz

Kuchi

Parhi

et al. 2020

Sci Rep

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Rare earth elements (REEs) have obtained a greatest significant in human lives owing to their important roles in various high technology applications. The present method development was deal technology important REEs such as neodymium, terbium and dysprosium, selective extraction with possible separation and recovery studies, successfully. The chloride mediated mixed aqueous solution containing 1500 mg/L each of REEs such as Nd, Tb and Dy was subjected at selective separation of Nd from other associated REEs. Three organo-phosphorous based commercial extracting agents such as Cyanex 272, PC 88A and D2EHPA, were employed for the extraction, possible separation and recovery of rare earth elements. A comparative extraction behavior of all these three extractants as function of time, pH influence, extractant concentration, temperature and diluents were systematically investigated. The extraction tendency of organo-phosphorus reagents towards the extraction of either of the REEs follows of the sequence as: D2EHPA > PC 88A > Cyanex 272. The thermodynamic behavior of either of the extractants on liquid–liquid extraction processing of REEs was investigated and thermodynamic calculations were calculated and presented. Substantial recovery of neodymium oxalate followed by its calcined product as neodymium oxide was ascertained from XRD study and SEM–EDS analysis.

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Section: Effect Of Diluentssupporting

confidence: 87%

Environmentally friendly comprehensive hydrometallurgical method development for neodymium recovery from mixed rare earth aqueous solutions using organo-phosphorus derivatives

Ruiz

Kuchi

Parhi

et al. 2020

Sci Rep

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“…Therefore, the result of our experiment would apply with speculative conditions only. We also reviewed a report by Nascimento et al (2015) [30]. They suggested that the concentration of extractant is impactful for extraction efficiency, as a high volume of extractant is increases possibilities of metal formation with the extractant.…”

Section: Results Of Ph Effectmentioning

confidence: 99%

Recovery of Lithium from Simulated Secondary Resources (LiCO3) through Solvent Extraction

Waengwan

Eksangsri

2020

Sustainability

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Lithium extraction is currently too inefficient to be economical or marketable. The objective of this work was to find the best extractant and the most inexpensive approach to recover lithium chemically from lithium ion batteries containing other desired metals using the solvent extraction technique. The extraction efficiency of various extracting types was investigated. The highest extraction efficiency of lithium ion from aqueous solution was obtained with bis(2-ethylhexyl) phosphate (DEHPA), with 75% recovery. Studying the effects of selected extractants in this experiment, it was found that the acidic extractant group provided better extraction efficiency than solvating extractants. Further investigation of influential variables was carried out, including extraction time, pH of aqueous solution, and initial concentration. The results indicate that 6 h of extraction brings the system to equilibrium, and pH 1.5 is the best for extraction efficiency.

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“…In Egypt, the main REE resource is monazite, which is extensively ascertained at the northern cost of the Mediterranean Sea but limited to the southern coast of the Red Sea [5]. Many chemical methods have been used to separate REEs from their ores or leach liquors, including precipitation [6], solvent extraction [7], ion-exchange [8], adsorption [9], liquid emulsion membrane [10,11], and ion inclusion membrane [12]. Generally, precipitation methods (through double-sulfate or HF or oxalic acid as a precipitate) are probably applied at REE concentrations of more than 10%, whereas solvent extraction methods are performed at concentrations of > 2000 mg L -1 .…”

Section: Introductionmentioning

confidence: 99%

Inclusion, Occlusion and adsorption of rare earth elements from chloride media onto Barite.Gypsum Co-precipitate

Abdo

Hagag

Ali

et al. 2022

Preprint

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The high demand for rare earth elements (REEs) was prompted scientists to look for a low-cost technique of REEs extracting from their ores. In this study, a synthetic (BaSO4.CaSO4) composite is prepared by co-precipitation of an equal concentration of barium and calcium chlorides for the recovery of REEs from acidic chloride leach liquor of monazite mineral. The prepared BaSO4.CaSO4 is characterized by FT-IR, XRD, DTA, SEM, particle size analysis, and pore size distribution. Adsorption experiments were carried out at pH = 4 and the sorption equilibrium were reached after 20 minutes. The sorption reaction followed a pseudo 2nd order mechanism. The sorption reaction was regulated with Langmuir adsorption isotherm. The monolayer adsorption capacity is 168.63 mg g-1 at 303 K. Thermodynamic studies showed that the sorption reaction is endothermic and spontaneous. The desorption of RE3 + is accomplished with 90.14% efficiency using 1 mol L-1 HNO3. BaSO4.CaSO4 could be reused after 5 adsorption-desorption cycles with 73% efficiency. The obtained results discuss the efficient use of 1:1 Barite. Gypsum composite as a natural mixture for REEs extraction. The adsorption capacity of Barite. Gypsum composite was 136 mg g-1.

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Separation of rare earths by solvent extraction using DEHPA

Cited by 11 publications

References 12 publications

Environmentally friendly comprehensive hydrometallurgical method development for neodymium recovery from mixed rare earth aqueous solutions using organo-phosphorus derivatives

Environmentally friendly comprehensive hydrometallurgical method development for neodymium recovery from mixed rare earth aqueous solutions using organo-phosphorus derivatives

Recovery of Lithium from Simulated Secondary Resources (LiCO3) through Solvent Extraction

Inclusion, Occlusion and adsorption of rare earth elements from chloride media onto Barite.Gypsum Co-precipitate

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