Recovery of rare earths from ion-absorbed rare earths ore with MgSO 4 -ascorbic acid compound leaching agent

Fuguo, Lai; Li, Huang; Gao, Guohua; Run, Yang; Xiao, Yanfei

doi:10.1016/j.jre.2017.12.003

Cited by 36 publications

(10 citation statements)

References 14 publications

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“…Studies using organic acids (acetic, citrus, oxalic, ascorbic and formic) in REE leaching are more recent. These acids can be considered promising and efficient, minimizing emissions caused by the use of mineral inorganic acids [39,[43][44][45][46]. Behera and Parhi (2016), studied the efficiency of acetic acid for the leaching of NdFeB magnets, obtaining 99.9% of Nd and Fe extraction after 240 min [36].…”

Section: Introductionmentioning

confidence: 99%

“…Behera and Parhi (2016), studied the efficiency of acetic acid for the leaching of NdFeB magnets, obtaining 99.9% of Nd and Fe extraction after 240 min [36]. Lai et al (2018), for example, used magnesium sulfate and ascorbic acid to leach the REE present in ores, obtaining an efficiency of up to 85.7% [43]. Behera et al (2019), studied the use of organic reagents (ascorbic, citric, acetic, formic and tartaric acid) in the dissolution of neodymium (Nd) from WEEE magnets.…”

Section: Introductionmentioning

confidence: 99%

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Recovery of Rare Earth Elements Present in Mobile Phone Magnets with the Use of Organic Acids

2022

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Currently, the recovery of materials from secondary sources is increasingly necessary because of the scarcity of materials. Significant amounts of rare earth elements (REE) are found in permanent neodymium-iron-boron (NdFeB) magnets, used in various electrical and electronic equipments, such as mobile phones. However, the estimated recycling rate for REEs is only 1%. Hydrometallurgical routes are the most commonly used for REE recovery from secondary sources. This route usually uses inorganic acids, which are expensive and toxic. Thus, in this work the leaching efficiency of organic acids (acetic and citric) in leaching the REE (neodymium and praseodymium) present in magnets of obsolete or defective mobile phones was evaluated. Different concentrations of acids, solid/liquid relations, times and leaching techniques (microwave, ultrasound and conventional) are also evaluated. The results indicate that acetic and citric acids have the potential to leach Nd and Pr. Microwave leaching was the most effective method, compared to ultrasound and conventional methods. In microwaves, citric acid at 0.5 M (ratio s/l 1/100) leached 57% of Nd and 58% of Pr. Acetic acid at 0.5 M (s/l ratio—1/100) leached 48% of Nd and 65% of Pr, in 15 min. Furthermore, both citric acid and acetic acid also leached high percentages of iron (51% and 72%, respectively).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recovery of Rare Earth Elements Present in Mobile Phone Magnets with the Use of Organic Acids

2022

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“…Nowadays ammonium salts widely used in the mines as leaching agents were easy to lead to the enrichment of ammonia nitrogen causing water eutrophication (Li et al, 2010). So lots of scholars have been exploring the new leaching agent in recent years, such as magnesium salt (Xiao et al, 2015), carboxylate salt (Zhou et al, 2019) and compound salt (Lai et al, 2018), etc. Huang et al (2005 found that magnesium salt has high permeability and leaching rate, which was recognized as the most likely substitute for ammonium salt in the proposed new leaching agent because of no ammonia nitrogen.…”

Section: Introductionmentioning

confidence: 99%

Seepage mechanism during in-situ leaching process of weathered crust elution-deposited rare earth ores with magnesium salt

Liu

Zhang

Chi

2020

Physicochem. Probl. Miner. Process.

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To reveal seepage mechanism during in-situ leaching process of weathered crust elutiondeposited rare earth ores with magnesium salt, the effects of particle gradation, particle migration, Atterberg limit on the permeability coefficient were investigated, and the relation between the particle size and rare earth content was discussed. The results showed that the ore in the humic layer (HL) with high porosity and permeability was uniformly graded particles. The ore in the completely weathered layer (CWL) with low porosity and permeability belonged to dense-graded particles. The ore in the partly weathered layer (PWL) was open-graded particles, whose permeability fell in between the HL and the PWL. The change of -0.075mm particles content was the largest in the leaching process. When -0.075mm particle content was less than 30%, the migration ability of fine particles and the permeability coefficient decreased gradually. On the contrary, the migration ability of fine particles gradually remained stable, and the change in the permeability coefficient was not obvious. The liquid limit (LL) in the Atterberg limit of HL, CWL and PWL was inversely proportional to the permeability coefficient, and followed the order: LLHL < LLPWL < LLCWL. With the -0.075mm particle content increasing, the LL of the ore samples increased gradually and finally tended to be stable. The peak value of rare earth concentration appeared earlier and the rare earth content decreased gradually with the increase of the ore particle size. This work provided a theoretical basis for achieving high-efficient mining of weathered crust elution-deposited rare earth ores.

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“…Now, several technologies for recovering REEs from solution were electrochemical, solvent extraction, , ion exchange, , and chemical precipitation. , However, most of them had evident disadvantages, such as high costs, inefficient at low concentrations of REEs, and environmental pollution. The adsorption method has been recognized as a cost-efficient and eco-friendly way for separation and adsorption of metal ions and organic pollutants from solution. − …”

Section: Introductionmentioning

confidence: 99%

Acrylic Acid-Functionalized Metal–Organic Frameworks for Sc(III) Selective Adsorption

Lou

Xiao

Huang

et al. 2019

ACS Appl. Mater. Interfaces

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Recovery of rare earths from ion-absorbed rare earths ore with MgSO 4 -ascorbic acid compound leaching agent

Cited by 36 publications

References 14 publications

Recovery of Rare Earth Elements Present in Mobile Phone Magnets with the Use of Organic Acids

Recovery of Rare Earth Elements Present in Mobile Phone Magnets with the Use of Organic Acids

Seepage mechanism during in-situ leaching process of weathered crust elution-deposited rare earth ores with magnesium salt

Acrylic Acid-Functionalized Metal–Organic Frameworks for Sc(III) Selective Adsorption

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