Research progress in the preparation of iron by electrochemical reduction route without CO2 emissions

Wang, Xin; Yang, Haitao; Yu, Xiaohua; Hu, Jiacheng; Cheng, Jiaxin; Jing, Hailong

doi:10.1007/s10800-023-01870-7

Cited by 5 publications

(3 citation statements)

References 40 publications

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“…29 More information on electrodeposition of iron from acid solution can be found in the literature. 30 Recent efforts to develop a closed-loop magnet recycling process utilize an undivided electrochemical cell where the magnet was dissolved electrochemically and iron was deposited on a copper cathode. 31 However, the undivided cell approach results in possible iron oxidation on the anode, leading to an increased cathodic side reaction of Fe(III) reduction to Fe(II).…”

Section: Introductionmentioning

confidence: 99%

“…With the development of ion exchange membranes (replacing the diaphragm), there has been a recent effort to implement this process at an industrial scale from iron-rich metal sulfate wastes such as copperas (Fe II sulfate) solutions produced during metal beneficiation . More information on electrodeposition of iron from acid solution can be found in the literature …”

Section: Introductionmentioning

confidence: 99%

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A Novel Electrochemical Process for Recovery of Rare Earth Elements and Iron from Neodymium–Iron–Boron Based Magnets

Haque,

Alvarez-Pugliese,

Botte

2024

ACS Sustainable Resour. Manage.

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A novel low-temperature electrochemical method for rare earth elements (REEs) recovery from spent permanent magnets was investigated at bench scale. First, magnets were completely dissolved in a 2 g sulfuric acid/g magnet powder solution at room temperature. Then, the iron present in the leachate was either oxidized or reduced electrochemically. After that, REEs were separated as double salt precipitates by the addition of sodium sulfate or sodium hydroxide. A sodium sulfate quantity of 5 times the stoichiometric mass amount proved to be adequate for achieving recovery rates of 90−99% for neodymium, praseodymium, and terbium in the acid leachate, while ensuring no iron coprecipitation. Iron speciation (either fully oxidized or fully reduced) was demonstrated to have no apparent effect on REEs recovery. However, 2−7% iron coprecipitation was observed for acid leachate containing fully reduced iron. Finally, iron, the element of higher weight fraction in magnets, was recovered (77.32% in 20 h) in its useful metallic form by a divided electrowinning process at a moderate temperature (70 °C). The purity of the electrodeposited iron layer was determined to be 95.20 ± 3.57%. The novelty of the proposed environmentally friendly method is the recovery of iron in metallic electrolytic form and REEs in sulfate form, avoiding high temperature pyrometallurgical methods (roasting) or the use of additional chemical oxidizers.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Electrochemical Process for Recovery of Rare Earth Elements and Iron from Neodymium–Iron–Boron Based Magnets

Haque,

Alvarez-Pugliese,

Botte

2024

ACS Sustainable Resour. Manage.

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“…For the physical method, iron nanoparticles are obtained via milling [43,44], and laser ablation [45]. Chemical methods, such as NaBH 4 reduction [46][47][48][49][50] with the assistance of an ultrasound treatment [51], carbothermal reduction [52], chemical vapor condensation [53], hydrothermal carbonization [54], a polyol process [55,56], electrochemical approaches [57,58], and green synthesis [59][60][61], are paid more attention, mainly due to their good approachability without the need for large-scale special apparatus and facilities required for the physical method. Among the methods described above, the NaBH 4 reduction method is the most frequently used because homogeneous nanoparticles are obtained with simple procedures and mild conditions.…”

Section: Introductionmentioning

confidence: 99%

A CaH2-Assisted Reduction Method to Prepare Nanoscale Zero-Valent Iron (nZVI) from Fe2O3 for Water Remediation Application

Kobayashi,

Yamamoto,

Shoji

2023

Minerals

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In recent decades, nanoscale zero-valent iron (nZVI) has been extensively studied for application in environmental remediation because it is an eco-friendly, inexpensive nanomaterial with high reactivity. The chemical reduction of iron ions using NaBH4 in a liquid solution is the most frequently used method to obtain nZVI, but its drawbacks are the use of expensive and toxic NaBH4 and the secondary pollution caused by the B(OH)3 by-product. In this study, in order to obtain nZVI in a cleaner manner, we used a reduction method for Fe2O3 using CaH2, which is non-toxic and generates no pollutants. The results of X-ray diffraction, nitrogen adsorption, and scanning electron microscopy for the obtained samples indicated the formation of zero-valent iron nanopowder (22.5 m2/g) that was obtained via reduction at 220 °C for 5 h. The obtained nZVI was finally tested in the catalytic hydrogenation of p-nitrophenol as a model reaction of water remediation, verifying its good catalytic performance.

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Flexible solar-to-iron system: a new concept and its implementation

Yang

Zhang

Zhu

et al. 2023

Current Opinion in Chemical Engineering

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Research progress in the preparation of iron by electrochemical reduction route without CO2 emissions

Cited by 5 publications

References 40 publications

A Novel Electrochemical Process for Recovery of Rare Earth Elements and Iron from Neodymium–Iron–Boron Based Magnets

A Novel Electrochemical Process for Recovery of Rare Earth Elements and Iron from Neodymium–Iron–Boron Based Magnets

A CaH2-Assisted Reduction Method to Prepare Nanoscale Zero-Valent Iron (nZVI) from Fe2O3 for Water Remediation Application

Flexible solar-to-iron system: a new concept and its implementation

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