Enrichment of Low Concentration Rare Earths from Leach Solutions of Ion-Adsorption Ores by Bubbling Organic Liquid Membrane Extraction Using N1923

Liu, Jie; Huang, Kun; Wu, Xue-Bing; Liu, Huizhou

doi:10.1021/acssuschemeng.7b01682

Cited by 55 publications

(16 citation statements)

References 17 publications

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“…Considering the economical and technological feasibility of step-leaching and pre-enrichment of light and heavy REEs from Kao/Mt, the influence of desorption agent pH, concentration, and contact time on desorption characteristics of Nd 3+ , Eu 3+ , and Lu 3+ was investigated. Ammonium sulfate was selected as the desorption agent, which is commonly found in ion-adsorption RE ores . Since ion-adsorption RE ores are formed in a slightly acidic medium, the adsorbents that were used in the following desorption experiments were synthesized in a pH 5 solution.…”

Section: Results and Discussionmentioning

confidence: 99%

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Step-Leaching and Pre-Enrichment of Light and Heavy REEs from Kaolinite and Montmorillonite

Qiu

Yan

et al. 2022

ACS Sustainable Chem. Eng.

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Kaolinite (Kao) and montmorillonite (Mt) are the primary minerals present in ion-adsorption rare earth ores. Better understanding the adsorption/desorption characteristic for light and heavy rare earth elements (REEs) of Kao and Mt will be beneficial for the step-leaching and pre-enrichment of light and heavy REEs from ionadsorption REE ores. The experiments show that the more negative ζ potential and the larger specific surface area of Mt contribute to the higher adsorption capacity of REEs. The stability of REEs onto Kao and Mt increases with the increase in adsorption pH. There are obvious differences in the desorption characteristic among Nd 3+ , Eu 3+ , and Lu 3+ due to the different adsorption mechanisms. Lu 3+ almost adsorbed on Kao through electrostatic force, and its recovery is 88% when the desorption pH was higher than 4; however, the recoveries were only 50% for Nd 3+ and 56% for Eu 3+ , which interact with the Kao surface dominated by coordination bonds. However, the opposite desorption characteristic occurred on Mt. Based on these different desorption characteristics of light and heavy REEs, stepdesorption and pre-enrichment for Nd 3+ and Lu 3+ from Kao and Mt were feasible. In the first lixivium of Kao, the percentage of Lu 3+ is high, up to 68.4%, and Nd 3+ is enriched in the second lixivium, with a percentage of 73.9%. As for Mt, Lu 3+ is difficult to be desorbed and enriched in the second lixivium with a percentage of 87.7%.

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Section: Results and Discussionmentioning

confidence: 99%

“…Ammonium sulfate was selected as the desorption agent, which is commonly found in ion-adsorption RE ores. 31 Since ion-adsorption RE ores are formed in a slightly acidic medium, the adsorbents that were used in the following desorption experiments were synthesized in a pH 5 solution.…”

Section: Adsorption Characteristics Of Nd 3+mentioning

confidence: 99%

Step-Leaching and Pre-Enrichment of Light and Heavy REEs from Kaolinite and Montmorillonite

Qiu

Yan

et al. 2022

ACS Sustainable Chem. Eng.

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“…Some studies dealing with the extraction and separation of REEs used liquid membranes [16]. A bubbling organic liquid membrane extraction using primary amine N1923 was used to extract and enrich low concentration REEs from leaching solutions of rare-earth ores [17]. Low-concentration REEs were also extracted using a bubbling organic liquid membrane with un-saponified P507 [18].…”

Section: Introductionmentioning

confidence: 99%

Recovery of rare earth elements from electronic waste by diffusion dialysis

Hammache

Bensaadi

Berbar

et al. 2021

Separation and Purification Technology

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Recycling rare earth elements (REEs) contained in electronic waste is of utmost importance due to their ever-increasing use in the high-tech sector. In this context, the use of non-polluting techniques represents a real challenge for scientists. In this work, we demonstrated that a clean and energy-efficient process, diffusion dialysis, has great potential for the recovery of neodymium (Nd) and praseodymium (Pr), contained in the Nd-Fe-B magnets of end-of-life computer hard disk drives (HDDs). Four kinds of polymer membranes were prepared by blending cellulose triacetate (CTA) and polyethylenimine (PEI) with the addition of di-(2ethylhexyl) phosphoric acid (D2EHPA), tridodecylamine (TDDA), trioctylamine (TOA) or trioctylphosphine oxide (TOPO). The membranes were first characterized by several techniques such as water uptake, contact angle, ATR-FTIR, SEM, XRD and zeta potential. They were further implemented in diffusion dialysis experiments in which diluted HDDs leachates were used as feed solutions. The relevance of the diffusion dialysis process for the recovery of REEs was demonstrated as it was possible to extract up to 15% of the boron by spontaneous diffusion through the CTA / PEI / TOA membrane in 6 hours with a lab-scale cell operating in batch mode. All membranes were positively charged under the operating conditions and then, REEs (present mainly in the form of trivalent cations Nd 3+ and Pr 3+) were strongly rejected. A fairly good correlation was found between the membrane water uptake and boron transfer, with boric acid molecules passing more easily through the more hydrated membranes. The selectivity factor between boron and REEs resulted from the interplay between the membrane structure, its water uptake ability and surface charge. It was also found to be dependent on the leachate composition. The CTA / PEI / TDDA membrane was found to exhibit the greatest B / REE selectivity factors, with values reaching up to 3706 and 140 for Nd and Pr, respectively. The lower selectivity towards Pr was explained by the weaker Gibbs energy of hydration of Pr 3+ cations compared with Nd 3+ .

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“…However, it was found that a prerequisite for successfully performing the bubbling organic liquid membrane extraction is the method to control the formation of stable organic liquid membrane covered on the surface of gas bubbles . When the gas was bubbled into the aqueous solutions through the internal gas needles of the injector, the organic extractant passed through the annular gaps between the internal gas needles and the external organic needles and then met with the gas bubbles on the top end of the gas needles, so that the organic extractant could be dispersed and spread on the surface of the gas bubbles because of its surface activity.…”

Section: Introductionmentioning

confidence: 99%

Chemical Reaction-Driven Spreading of an Organic Extractant on the Gas–Water Interface: Insight into the Controllable Formation of a Gas Bubble-Supported Organic Extractant Liquid Membrane

et al. 2019

Self Cite

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The extraction and recovery of low-concentration valuable metals from various complex aqueous solutions or industrial waste waters have attracted extensive interests in recent years. In our previous works, we suggested a novel technique called bubbling organic liquid membrane extraction by spreading and covering an organic extractant with extremely small volume on the surface of gas bubbles to form a layer of the gas bubble-supported organic liquid membrane for selective extraction and enrichment of low-concentration targets from dilute aqueous solutions. It was found that for successfully performing the bubbling organic liquid membrane extraction, a prerequisite is knowing how to control the formation of a stable organic liquid membrane covered on the surface of gas bubbles. However, once the organic extractant starts to spread on the surface of gas bubbles, the extraction chemical reaction at the interface between the organic extractant liquid membrane and the rare-earth aqueous solution will occur. In the present work, the spreading behavior of the organic extractant P507 on the surface of rare-earth aqueous solutions was investigated and was compared with the behaviors on the surface of deionized water. It was revealed that the spreading of the organic extractant P507 on the surface of aqueous solutions containing rare-earth ions was accelerated because of the occurrence of the chemical reactions at the gas–water interface. The difference in the spreading rate of organic extractant P507 liquid droplets on the surface of deionized water and on that of Er(III) aqueous solutions with an increase in the P507 concentration, the saponification degrees of the P507 extractant, and the preloading amount of Er(III) in the P507 extractant revealed that the chemical reaction at the interface between the spreading P507 thin liquid membrane and the Er(III) aqueous solution would result in the Marangoni convection along the interface, which is in favor of overcoming the resistance from the viscous force when the surface tension gradient replaces gravity as a dominant driving force for the spreading. The present work provides an experimental foundation toward understanding the effect of the interfacial chemical reaction on the spreading behavior of an organic oil droplet on the gas–water interface. It is beneficial for the development of our suggested new technique of bubbling organic liquid membrane extraction and to achieve a controllable generation of a stable gas bubble-supported organic liquid membrane for performing solvent extraction at large aqueous-to-oil phase ratios.

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Enrichment of Low Concentration Rare Earths from Leach Solutions of Ion-Adsorption Ores by Bubbling Organic Liquid Membrane Extraction Using N1923

Cited by 55 publications

References 17 publications

Step-Leaching and Pre-Enrichment of Light and Heavy REEs from Kaolinite and Montmorillonite

Step-Leaching and Pre-Enrichment of Light and Heavy REEs from Kaolinite and Montmorillonite

Recovery of rare earth elements from electronic waste by diffusion dialysis

Chemical Reaction-Driven Spreading of an Organic Extractant on the Gas–Water Interface: Insight into the Controllable Formation of a Gas Bubble-Supported Organic Extractant Liquid Membrane

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