Synergistic promotion of ascorbic acid and sodium citrate to the stability of electrolyte for electrolytic iron production

Wang, Qiaoling; Sun, Chenteng; Gu, Yurong; Wang, Liying; Xu, Qian; Dong, Han; Liu, Tengshi; Zou, Xingli; Cheng, Hongwei; Lu, Xionggang

doi:10.1007/s10800-024-02129-5

Cited by 1 publication

(2 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is obvious that the side reaction of hydrogen evolution consumes a significant portion of the energy. This reaction can be suppressed either by adjusting the pH of the iron-rich solution to a higher value prior to performing the electrowinning experiment or by adding additives, e.g., sodium citrate . However, raising bulk solution pH to a higher value has a contrasting effect.…”

Section: Resultsmentioning

confidence: 99%

“…This reaction can be suppressed either by adjusting the pH of the iron-rich solution to a higher value prior to performing the electrowinning experiment or by adding additives, e.g., sodium citrate. 37 However, raising bulk solution pH to a higher value has a contrasting effect. The evolution of hydrogen leads to increased local pH close to the electrode surface.…”

Section: Iron Recovery By Electrowinningmentioning

confidence: 99%

See 1 more Smart Citation

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.

View full text Add to dashboard Cite

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.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Iron Recovery By Electrowinningmentioning

confidence: 99%