Solvent extraction of lanthanum(III) from sulphuric acid solutions by Primene JMT

El-Yamani, I. S.; Shabana, E. I.

doi:10.1016/0022-5088(85)90412-6

Cited by 18 publications

(8 citation statements)

References 5 publications

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“…However, the impact of the dissociation of sulfuric acid (which is used for pH control) can also influence the sorption properties. Indeed, the presence of HSO 4 -(in weakly acidic solutions) may involve competition effects: the formation of complexes with lower affinity for amine groups influences the sorption efficiency (Elyamani and Shabana 1985). Based on the sorbent stability, precipitation issues (above pH 6-6.5), pH variation and sorption increase with pH, further experiments were performed at initial pH 5.…”

Section: Sorption As a Function Of The Phmentioning

confidence: 99%

Diethylenetriamine-functionalized chitosan magnetic nano-based particles for the sorption of rare earth metal ions [Nd(III), Dy(III) and Yb(III)]

et al. 2015

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The recovery of three rare earth (RE) metals ions [Yb(III), Dy(III) and Nd(III), belonging to heavy, mild and light REs, respectively] was investigated using hybrid chitosan-magnetic nano-based particles functionalized by diethylenetriamine (DETA). The effect of pH on sorption performance was analyzed: the optimum initial pH value was found close to 5 (equilibrium pH value close to 6.5). The nanometric size of sorbent particles (30-50 nm) minimized the contribution of resistance to intraparticle diffusion on the control of uptake kinetics, which is efficiently modeled using the pseudo-second order rate equation: under selected experimental conditions the contact time required for reaching equilibrium was less than 1 h. Sorption isotherms were efficiently modeled using the Langmuir equation: maximum sorption capacities reached about 50 mg metal g -1 , regardless of the RE. The temperature had a very limited effect on sorption capacity (in the range 300-320 K). The thermodynamic parameters were determined: the sorption was endothermic (positive values of DH°), spontaneous (negative values of DG°) and contributed to increasing the disorder of the system (positive values of DS°). The three REs have similar sorption properties on DETA-functionalized chitosan magnetic nano-based particles: the selective separation of these elements seems to be difficult. The sorbed metal ions can be removed from loaded sorbents using thiourea, and the sorbent can be recycled for at least five sorption/desorption cycles with a limited loss in sorption performance (by less than 6 %). The saturation magnetization was close to 20 emu g -1 ; this means that nano-based superparamagnetic particles can be readily recovered by an external magnetic field, making the processing of these materials easy.

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Section: Sorption As a Function Of The Phmentioning

confidence: 99%

Diethylenetriamine-functionalized chitosan magnetic nano-based particles for the sorption of rare earth metal ions [Nd(III), Dy(III) and Yb(III)]

et al. 2015

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“…According to early work, separation factors for adjacent REEs with primary or tertiary amines were higher in sulfate media than in chloride media, so that sulfate media was more promising for ion-pair solvent extraction [113,114]. El-Yamani and Shabana indicated that the extraction of La from sulfate solutions with Primene JMT was extracted according to the following Reactions (4) and ( 5) [115]. The extraction reaction of quaternary ammonium salts could be also simply represented as Reaction (6) [116,117] where RNH 2 denotes the Primene JMT in the organic phase, Ln denotes the rare earth ion and R 4 N + NO 3 − the quaternary ammonium nitrate salt.…”

Section: Ion-pair Solvent Extractionmentioning

confidence: 99%

Hydrometallurgical Recovery of Rare Earth Elements from NdFeB Permanent Magnet Scrap: A Review

Zhang

et al. 2020

Metals

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NdFeB permanent magnet scrap is regarded as an important secondary resource which contains rare earth elements (REEs) such as Nd, Pr and Dy. Recovering these valuable REEs from the NdFeB permanent magnet scrap not only increases economic potential, but it also helps to reduce problems relating to disposal and the environment. Hydrometallurgical routes are considered to be the primary choice for recovering the REEs because of higher REEs recovery and its application to all types of magnet compositions. In this paper, the authors firstly reviewed the chemical and physical properties of NdFeB permanent magnet scrap, and then carried out an in-depth discussion on a variety of hydrometallurgical processes for recovering REEs from the NdFeB permanent magnet scrap. The methods mainly included selective leaching or complete leaching processes followed by precipitation, solvent extraction or ionic liquids extraction processes. Particular attention is devoted to the specific technical challenge that emerges in the hydrometallurgical recovery of REEs from NdFeB permanent magnet scrap and to the corresponding potential measures for improving REEs recovery by promoting the processing efficiency. This summarized review will be useful for researchers who are developing processes for recovering REEs from NdFeB permanent magnet scrap.

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“…At pH 0.5 the extraction of yttrium and neodymium was only 30% and 50%, respectively. This is due to the fact that there is competition between the extractable yttrium or neodymium species and HSO4 -(which predominates in sulfate media at low pH) for the available alkyl ammonium cation at higher acid concentrations (El-Yamani and Shabana 1985).…”

Section: Effect Of Aqueous Phmentioning

confidence: 99%

“…Increasing the pH in this research increased the extraction. Using 0.025 M Primene JM-T in kerosene for the organic, 10 -6 M rare earth concentration in the aqueous, 5 mL of both organic and aqueous and 20 minute contact time, El-Yamani and Shabana (1985) concluded that the optimum pH range for rare earth extraction is pH 1-1.7. Desouky et al's (2009) research with yttrium agreed with El-Yamani and Shabana's conclusion as they found the optimum pH for yttrium extraction was 1.56.…”

Section: Effect Of Aqueous Phmentioning

confidence: 99%

Recovery of yttrium and neodymium from copper pregnant leach solutions by solvent extraction

Copp

2018

Hydrometallurgy

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Solvent extraction of lanthanum(III) from sulphuric acid solutions by Primene JMT

Cited by 18 publications

References 5 publications

Diethylenetriamine-functionalized chitosan magnetic nano-based particles for the sorption of rare earth metal ions [Nd(III), Dy(III) and Yb(III)]

Diethylenetriamine-functionalized chitosan magnetic nano-based particles for the sorption of rare earth metal ions [Nd(III), Dy(III) and Yb(III)]

Hydrometallurgical Recovery of Rare Earth Elements from NdFeB Permanent Magnet Scrap: A Review

Recovery of yttrium and neodymium from copper pregnant leach solutions by solvent extraction

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