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 13 publications

(5 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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“…To address this problem, various separation processes, such as COEX (combined U and Pu extraction), GANEX (grouped actinide extraction), and UREX (uranium extraction) are being developed. [26][27][28][29][30][31][32][33][34][35] Alongside the separation process, partitioning and transmutation technology is one of the potential future solutions for nuclear waste management. This technology is based on the quantitative recycling of long-lived and highly radiotoxic nuclides through pyrometallurgical processing to create new fuel for use in advanced fast-neutron reactors.…”

Section: Nuclear Wastementioning

confidence: 99%

Nuclear Waste Management

Cetina

2024

Kem. ind. (Online)

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Nuclear energy production generates nuclear waste. Nuclear and radioactive waste, especially high level waste (HLW) and intermediate level waste (ILW), require special long-term safe management solutions. One part of the solution involves recycling through reprocessing of spent nuclear fuel. Recycling reduces the volume of nuclear waste and allows for the reuse of some of its components. This can be achieved through methods such as adsorption, ion exchange, coagulation, flotation, filtration, chemical precipitation, reverse osmosis, and solvent extraction, like the PUREX process. Another possible future solution involves partitioning and transmutation technology, which can reduce the production of nuclear waste. The best long-term solution is the immobilisation of HLW and ILW in a solid matrix. Materials used for this purpose include glasses, cements, bitumen, geopolymers, concrete, and ceramics as a promising material. While cementation is still the most commonly used immobilisation method due to its low cost and simplicity, vitrification is a more permanent long-term solution. Deep geological disposal in combination with vitrification and a robust multi-barrier system is considered the most acceptable solution for safe nuclear waste isolation. This review provides insight into the mostly commonly used and promising immobilisation materials, as well as the most effective methods and technologies currently in use and under development for the management of HLW and ILW in nuclear waste management.

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Separation of rare earths by solvent extraction using DEHPA

Cited by 13 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

Nuclear Waste Management

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