Gels, emulsions, and liquid crystals in extraction systems with Di(2-ethylhexyl)phosphoric acid

Yurtov, E. V.; Мурашова, Н. М.

doi:10.1134/s0040579507050508

Cited by 13 publications

(10 citation statements)

References 9 publications

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“…Increased NORM extraction was expected, as amines are widely used in commercial solvent extraction of radioactive elements . Even though promising extraction efficiencies were found, the phase separation was problematic in all cases due to high transition-metal loading. − Formation of an inseparable phase occurred in all extraction trials with slow separation behavior, predicting a high loss of the organic phase and processing problems in a larger-scale continuous operation.…”

Section: Resultsmentioning

confidence: 99%

Nanofiltration-Enhanced Solvent Extraction of Scandium from TiO₂ Acid Waste

Hedwig

Yagmurlu

Huang

et al. 2022

ACS Sustainable Chem. Eng.

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Scandium is a critical raw material with a technological potential to reduce transportation costs and CO 2 emissions. However, global supply and market adoption are crucially impaired by the lack of high-grade Sc ores and recovery strategies. A tandem nanofiltration solvent extraction route is demonstrated to enable effective Sc recovery from real-world acid waste from the chloride TiO 2 production route. The process involving several filtration stages, solvent extraction, and precipitation was optimized, ultimately producing >97% pure (NH 4 ) 3 ScF 6 .

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Section: Resultsmentioning

confidence: 99%

Nanofiltration-Enhanced Solvent Extraction of Scandium from TiO₂ Acid Waste

Hedwig

Yagmurlu

Huang

et al. 2022

ACS Sustainable Chem. Eng.

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“…In general the concentrations of the aqueous feed solutions are between 30 and 50 g/L (total rare-earth oxide content). A high loading of the organic phase should be avoided, because otherwise a gel can form (Yurtov and Murashova, 2007). In the case of HDEHP, gel formation occurs at approximately 50% saturation of the extractant.…”

Section: Introductionmentioning

confidence: 99%

Separation of rare earths by split-anion extraction

Larsson

Binnemans

2015

Hydrometallurgy

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Split-anion extraction is a new approach to the separation of mixtures of rare earths by solvent extraction. The rare-earth ions are extracted from a concentrated chloride aqueous phase to an organic phase, consisting of a water-immiscible thiocyanate or nitrate ionic liquid. This allows for efficient extraction of trivalent rare-earth ions from a chloride aqueous phase, without the need of using acidic extractants. The process is called split-anion extraction because the aqueous and organic phase contain different anions. Thiocyanate and nitrate anions have a strong affinity for the organic phase, while chloride anions have a strong affinity for the aqueous phase. In split-anion extraction, the source of complexing anions is the organic phase which allows for the use of chloride aqueous feed solutions and easy stripping of the rare earths from the loaded ionic liquid phase by water (instead of strong inorganic acids). The principle of the new extraction approach is described in detail for the extraction of rare earths from aqueous chloride solutions by the ionic liquids tricaprylmethylammonium thiocyanate and trihexyl(tetradecyl)phosphonium thiocyanate. Rare-earth and chloride concentrations can be varied to optimize the separation process. Separation factors between the end members of the lanthanide series (La-Lu) exceed the value of 200000.

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“…Because of this, they not only concentrate at the interface, but also form condensed films here (due to cohesion forces). According to the second mechanism, adsorption occurs at the interface of hydrolyzed forms, associates, colloidal particles, and suspensions, which are present in solution in advance, leading to the formation of gellike surface structures [83][84][85][86].…”

Section: Mechanism Of Formation Of Interface Structuresmentioning

confidence: 99%

Interfacial Synthesis: Morphology, Structure, and Properties of Interfacial Formations in Liquid–Liquid Systems

Golubina

Kizim

2021

Russ. J. Phys. Chem.

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The results of studies in the field of interfacial synthesis and interfacial formations in liquid–liquid systems are summarized. The mechanisms of the processes of interfacial synthesis are considered. Data on the self-assembly of nanoparticles, films, and 3D materials are given. The properties of materials of interfacial formations in systems with rare-earth elements and di(2-ethylhexyl)phosphoric acid, obtained both in the presence and absence of local vibrations, are described. It was established that materials obtained in the presence of local vibrations in the interfacial layer have higher density, melting point, and magnetic susceptibility and lower electric conductivity. The effect of force field parameters on the properties of interfacial formations is considered. Practical applications and prospects for research in the field of interfacial formations are discussed.

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Gels, emulsions, and liquid crystals in extraction systems with Di(2-ethylhexyl)phosphoric acid

Cited by 13 publications

References 9 publications

Nanofiltration-Enhanced Solvent Extraction of Scandium from TiO₂ Acid Waste

Nanofiltration-Enhanced Solvent Extraction of Scandium from TiO₂ Acid Waste

Separation of rare earths by split-anion extraction

Interfacial Synthesis: Morphology, Structure, and Properties of Interfacial Formations in Liquid–Liquid Systems

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Gels, emulsions, and liquid crystals in extraction systems with Di(2-ethylhexyl)phosphoric acid

Cited by 13 publications

References 9 publications

Nanofiltration-Enhanced Solvent Extraction of Scandium from TiO2 Acid Waste

Nanofiltration-Enhanced Solvent Extraction of Scandium from TiO2 Acid Waste

Separation of rare earths by split-anion extraction

Interfacial Synthesis: Morphology, Structure, and Properties of Interfacial Formations in Liquid–Liquid Systems

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Product

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Nanofiltration-Enhanced Solvent Extraction of Scandium from TiO₂ Acid Waste

Nanofiltration-Enhanced Solvent Extraction of Scandium from TiO₂ Acid Waste