Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Eddy Currents01:25

Eddy Currents

2.8K
Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
2.8K
Ferromagnetism01:31

Ferromagnetism

3.2K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
3.2K
Other Unique Bacteria01:18

Other Unique Bacteria

502
Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
502
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

1.2K
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
1.2K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Magnetic Properties of High-Entropy Alloy FeCoNiTi.

ACS omega·2024
Same author

Magnetic and Transport Properties of New Dual-Phase High-Entropy Alloy FeRhIrPdPt.

Materials (Basel, Switzerland)·2021
Same author

A necessary criterion for obtaining accurate lattice parameters by Rietveld method.

Scientific reports·2017
See all related articles

Related Experiment Video

Updated: Feb 24, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

4.6K

Rare Earth Extraction from NdFeB Magnet Using a Closed-Loop Acid Process.

Jiro Kitagawa1, Ryohei Uemura2

  • 1Department of Electrical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3-30-1 Wajiro-higashi, Higashi-ku, Fukuoka, 811-0295, Japan. j-kitagawa@fit.ac.jp.

Scientific Reports
|August 16, 2017
PubMed
Summary

This study demonstrates a closed-loop hydrochloric acid (HCl) process for recycling rare earth elements from NdFeB magnets. The eco-friendly method offers cost advantages and reduces environmental impact from acid waste.

More Related Videos

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles
08:26

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Published on: October 19, 2015

12.7K
Fabrication of a Functionalized Magnetic Bacterial Nanocellulose with Iron Oxide Nanoparticles
08:59

Fabrication of a Functionalized Magnetic Bacterial Nanocellulose with Iron Oxide Nanoparticles

Published on: May 26, 2016

13.8K

Related Experiment Videos

Last Updated: Feb 24, 2026

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition
10:45

Stable Aqueous Suspensions of Manganese Ferrite Clusters with Tunable Nanoscale Dimension and Composition

Published on: February 5, 2022

4.6K
Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles
08:26

Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

Published on: October 19, 2015

12.7K
Fabrication of a Functionalized Magnetic Bacterial Nanocellulose with Iron Oxide Nanoparticles
08:59

Fabrication of a Functionalized Magnetic Bacterial Nanocellulose with Iron Oxide Nanoparticles

Published on: May 26, 2016

13.8K

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Rare earth elements (REEs) are critical for modern technologies, with Neodymium-Iron-Boron (NdFeB) magnets being a key source.
  • Traditional wet extraction processes generate problematic acid waste, necessitating sustainable recycling solutions.
  • Environmental concerns and resource scarcity drive the need for efficient REE recovery methods.

Purpose of the Study:

  • To demonstrate a closed-loop hydrochloric acid (HCl)-based process for extracting REEs from NdFeB magnets.
  • To evaluate an ionic liquid technique for iron removal and subsequent REE precipitation.
  • To assess the environmental and economic advantages of the proposed recycling method.

Main Methods:

  • NdFeB magnets were corroded in a pretreatment stage using HCl.
  • Iron was extracted from the HCl solution using an ionic liquid technique.
  • Rare earth elements were precipitated using oxalic acid in a triple extraction process.

Main Results:

  • The closed-loop process achieved approximately 50% REE recovery per extraction cycle.
  • Compared to a one-shot process, the triple extraction showed reduced overall efficiency.
  • The method operates near room temperature, simplifying procedures.

Conclusions:

  • The developed closed-loop HCl process is a promising, environmentally friendly, and cost-effective approach for recycling REEs from NdFeB magnets.
  • While extraction efficiency is moderate, the process minimizes acid waste discharge.
  • This study is a foundational step towards realizing sustainable closed-loop acid recycling systems for critical elements.