The novel extraction process based on CYANEX® 572 for separating heavy rare earths from ion-adsorbed deposit

Wang, Yanliang; Li, Fujian; Zhao, Zeyuan; Dong, Yamin; Sun, Xiaoqi

doi:10.1016/j.seppur.2015.07.063

Cited by 81 publications

(32 citation statements)

References 11 publications

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“…Only ah andful of neutral ligandst hat exhibit high selectivity for light lanthanides in solvent extraction systems have been previously described. [5][6][7][8] Them ajorityo ft he known ligandse xhibit the reverse trend, that is, by being more selectivet owardsh eavy lanthanides.E xamples include acidic compounds, such as bis(2-ethylhexyl) phosphoric acid (D2EHPA), [9] am ixture of phosphinica nd phosphonic acids (Cyanex572) [10] and bis(2ethylhexyl)phosphinic acid, [11] and neutral compounds, [12] such as N,N,N',N'-tetraoctyldiglycolamide (TODGA), [13][14][15] trialkylphosphine oxides( e.g.,C yanex9 23) [16] and bis-triazinylpyridine, [17][18][19] to mention but afew.…”

Section: Introductionmentioning

confidence: 99%

Efficient Separation of Light Lanthanides(III) by Using Bis‐Lactam Phenanthroline Ligands

Healy

Ivanov

Karslyan

et al. 2019

Chemistry A European J

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Due to the ever‐increasing demand for high‐purity individual rare‐earth elements, novel and highly selective separation processes are increasingly sought after. Herein, we report a separation protocol that employs shape‐persistent 2,9‐bis‐lactam‐1,10‐phenanthroline (BLPhen) ligands exhibiting unparalleled selectivity for light trivalent lanthanides. The highly preorganised binding pockets of the ligands allowed for the separation of lanthanides with high fidelity, even in the presence of competing transition metals, in a biphasic separation system. Notably, the selectivity trends of the BLPhen ligands towards metal ions across the lanthanide series can be chemically modulated by altering the molecular rigidity of the extractant.

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Section: Introductionmentioning

confidence: 99%

Efficient Separation of Light Lanthanides(III) by Using Bis‐Lactam Phenanthroline Ligands

Healy

Ivanov

Karslyan

et al. 2019

Chemistry A European J

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“…REEs usually coexist in minerals or industrial waste streams. However, individual REEs like Dy with high purity is needed in high technology [8]. As the Dy demand is still growing with the development of new markets, effective methods are desired for its extraction, separation, and purification.…”

Section: Introductionmentioning

confidence: 99%

Response Surface Optimization of Dysprosium Extraction Using an Emulsion Liquid Membrane Integrated with Multi‐Walled Carbon Nanotubes

et al. 2018

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A new emulsion liquid membrane was prepared for dysprosium (Dy) extraction from aqueous solution using multi-walled carbon nanotubes (MWCNTs). The influence of MWCNT concentration, carrier and surfactant concentration, stirring speed, feed-phase pH, and internal phase concentration and their interactive effects were studied. A regression model for Dy extraction was developed and the parameters were optimized by response surface methodology. The extent of extraction increases with higher MWCNT concentration up to a certain level. The Dy extraction through the liquid membrane containing MWCNT improves with time. Moreover, the overall mass transfer coefficient was enhanced in the presence of MWCNT due to the formation of a more stable emulsion and liquid membrane.

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“…For the extraction of HREEs, organophosphorus acidic cation extractants are used, such as di(2-ethylhexyl)phosphoric acid (P204), 2-ethylhexylphosphonicmono-2-ethylhexyl ester (P507) and bis (2,4,4-trimethylpentyl) phosphinic acid (Cyanex® 272). A recent addition to this class of extractants is Cyanex® 572 (C572, Cytec) [6], which is specially formulated for extraction of the HREEs with lower acid requirement during back extraction and stripping [7].…”

Section: Introductionmentioning

confidence: 99%

Microfluidic solvent extraction of rare earth elements from a mixed oxide concentrate leach solution using Cyanex® 572

Kolar

Catthoor

Kriel

et al. 2016

Chemical Engineering Science

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Solvent extraction of rare earth elements (REEs) involves hundreds of individual extraction and phase separation cycles, fine adjustment of solution conditions, and individual stage and overall process times that are long. Therefore, we investigated microfluidic solvent extraction (microSX) of REEs from a leached mixed rare earth oxide (REO) mineral concentrate using a phosphorus-based cationic exchange extractant (Cyanex® 572). A Y-Y microchip was used, in which the aqueous and organic phases were contacted for up to 15 s with sub-second resolution. The extraction rate and selectivity for heavy REEs was determined for the prepared leach solution. Good selectivity for heavy REEs was observed using the microchip for leach solutions adjusted to pH 0.7. Extraction rates on the microchip were typically double that observed in conventional (bulk) solvent extractions, except for Lu and Yb, which were three-times faster. The faster extraction can be largely attributed to the higher surface-to-volume ratio achieved in our microfluidic experiments; double that observed for bulk extractions under the conditions employed.

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The novel extraction process based on CYANEX® 572 for separating heavy rare earths from ion-adsorbed deposit

Cited by 81 publications

References 11 publications

Efficient Separation of Light Lanthanides(III) by Using Bis‐Lactam Phenanthroline Ligands

Efficient Separation of Light Lanthanides(III) by Using Bis‐Lactam Phenanthroline Ligands

Response Surface Optimization of Dysprosium Extraction Using an Emulsion Liquid Membrane Integrated with Multi‐Walled Carbon Nanotubes

Microfluidic solvent extraction of rare earth elements from a mixed oxide concentrate leach solution using Cyanex® 572

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