Extraction of lanthanum and neodymium from leach liquor containing rare earth metals (REMs)

Panda, Rekha; Jha, Manis Kumar; Hait, Jhumki; Kumar, Girendra; Singh, Ravi S.; Yoo, Kyoungkeun

doi:10.1016/j.hydromet.2015.10.019

Cited by 21 publications

(4 citation statements)

References 21 publications

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“…Therefore, citric acid mainly strips due to its complexing effect. The results show that to achieve a complete stripping for both extractants using HCl 1.2 M, two stages will be required or the HCl concentration would have to be increased (Panda et al, 2015). As already noted previously, the optimum stripping agent to achieve a good stripping is HCl 1.2 M for both extractants while citric acid 1 M could be also used in the case of Cy272.…”

Section: Effect Of the Different Stripping Agentsmentioning

confidence: 51%

Neodymium recovery from NdFeB magnet wastes using Primene 81R·Cyanex 572 IL by solvent extraction

Pavón

Fortuny

Coll

et al. 2018

Journal of Environmental Management

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The necessity of Rare Earth Elements (REEs) recycling is crucial to minimizing their supply risk and provide an alternative to greener technologies. Hence, the REEs recovery from NdFeB magnet wastes using cationic extractants by solvent extraction technique has been investigated in this research. Due to the difficulty in maintaining the aqueous pH in the industrial counter-current devices when extractants like Cyanex 272 or Cyanex 572 are used, the Primene 81R·Cyanex 572 ionic liquid has been synthesised to overcome this. 99.99% Nd(III) recovery with a purity of 99.7% from an aqueous mixture of Nd/Tb/Dy in chloride medium, the three representative REEs present in the NdFeB magnets wastes, has been achieved after two stages counter-current extraction process using 0.30 M of Primene 81R·Cyanex 572 ionic liquid (1:4 A:O ratio) diluted in Solvesso 100, without any aqueous pH conditioning.

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Section: Effect Of the Different Stripping Agentsmentioning

confidence: 51%

Neodymium recovery from NdFeB magnet wastes using Primene 81R·Cyanex 572 IL by solvent extraction

Pavón

Fortuny

Coll

et al. 2018

Journal of Environmental Management

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“…(Lee et al, 2013;Lyman and Palmer, 1993). Organic collectors that form insoluble compounds are also used in the precipitation process (Panda et al, 2016;Vander Hoogerstraete et al, 2014;Yoon et al, 2016). Moreover, the precipitation process of neodymium sulfate generates compounds that require to be purified.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Neodymium recovery from scrap magnet using ammonium persulfate

et al. 2019

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This study proposes a novel leaching methodology to recover neodymium from scrap magnet using ammonium persulfate ((NH4)2S2O8) solutions. The Nd-Fe-B magnets from obsolete Hard-Disk-Drives were physically treated by thermal demagnetization (400 °C, 45 min) and mechanical crushing (< 420 µm). The chemical composition of the ground sample was Nd: 31.5 wt%, Fe: 64.8 wt%, Co: 1.9 wt%, Ni: 0.6 wt%. Diagrams of equilibrium phases (Eh vs. pH) were designed to determine the predominance of the formed species in the (NH4)2S2O8 system. Ammonium persulfate aqueous solutions were prepared to generate oxidative sulfate radicals. These radicals allowed to leach the ground samples of Nd-Fe-B magnets and recover of neodymium sulfate. The influence of (NH4)2S2O8 concentration (0.7 -1.3 M), temperature (25 -75 °C) and L/S ratio (25 -50 mL/g) on Nd-Fe-B magnets leaching was investigated employing analysis of variance in a 2 3 full factorial experimental design. At the optimal conditions, quantities greater than 98% of Nd-Fe-B magnets were leached after 15 min reaction time. Neodymium sulfate was selectively recovered as crystals, and evaluated by chemical and crystallographic analyses. The findings presented in this investigation suggest that neodymium could be recovered from scrap magnet using an eco-friendly leaching methodology assisted by ammonium persulfate.

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“…3 As one of the most abundant REEs, lanthanum and its compounds are widely used in batteries, catalysts, and so on. 4 Solvent extraction has the advantages of simple equipment, high selectivity, and renewable. 5,6 It is widely used in chemical, metallurgy, and other fields.…”

Section: Introductionmentioning

confidence: 99%

Microextraction of lanthanum using a rotating microchannel extractor

Chen

Fan

et al. 2022

JSCS

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This work introduced a novel microchannel extractor. The extraction system was to extract lanthanum nitrate aqueous solution with 2-ethylhexyl phosphoric acid-2-ethylhexyl ester (EHEHPA). Different feeding methods and inner rotors were explored first. The results showed that parallel feeding and inner rotors engraved with spiral stripes were more favorable for extraction. Next, the effect of various factors on the extraction was explored, including the pH of the aqueous phase, rotational inner rotor speed (R) and the fluid volumetric flow rate (Q). The results showed that these factors are closely related to the extraction. Finally, the experiment was verified by CFD numerical simulation, the simulation result was consistent with the experiment. In this device, active mixing was introduced into the microchannel extraction, which significantly improved the extraction efficiency. Under certain conditions, the extraction efficiency of this device exceeded stirring extraction equilibrium. Moreover, the extraction in this device is faster than conventional stirring extraction. These advantages provide a possibility for highly efficient extraction and use of rare earth elements.

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Extraction of lanthanum and neodymium from leach liquor containing rare earth metals (REMs)

Cited by 21 publications

References 21 publications

Neodymium recovery from NdFeB magnet wastes using Primene 81R·Cyanex 572 IL by solvent extraction

Neodymium recovery from NdFeB magnet wastes using Primene 81R·Cyanex 572 IL by solvent extraction

Neodymium recovery from scrap magnet using ammonium persulfate

Microextraction of lanthanum using a rotating microchannel extractor

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