Journal of Powder Materials

Article

Effect of Oxidation Behavior of (Nd,Dy)-Fe-B Magnet on Heavy Rare Earth Extraction Process: Sangmin Park, Sun-Woo Nam, Sang-Hoon Lee, Myung-Suk Song, Taek-Soo Kim; J Korean Powder Metall Inst. 2021;28(2):91-96. Published online April 1, 2021; DOI: https://doi.org/10.4150/KPMI.2021.28.2.91

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Rare earth magnets with excellent magnetic properties are indispensable in the electric device, wind turbine, and e-mobility industries. The demand for the development of eco-friendly recycling techniques has increased to realize sustainable green technology, and the supply of rare earth resources, which are critical for the production of permanent magnets, are limited. Liquid metal extraction (LME), which is a type of pyrometallurgical recycling, is known to selectively extract the metal forms of rare earth elements. Although several studies have been carried out on the formation of intermetallic compounds and oxides, the effect of oxide formation on the extraction efficiency in the LME process remains unknown. In this study, microstructural and phase analyses are conducted to confirm the oxidation behavior of magnets pulverized by a jaw crusher. The LME process is performed with pulverized scrap, and extraction percentages are calculated to confirm the effect of the oxide phases on the extraction of Dy during the reaction. During the LME p rocess, Nd i s completely e xtracted a fter 6 h, w hile D y remains as D y₂Fe₁₇ and Dy-oxide. Because the decomposition rate of Dy₂Fe₁₇ is faster than the reduction rate of Dy-oxide, the importance of controlling Dy-oxide on Dy extraction is confirmed.

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Manipulation of reactivity based on metallic adsorption in magnesium alloy scraps for rare-earth recycling by liquid metal extraction
Sangmin Park, Yoonhyung Keum, Jaeyun Jeong, Seunghun Cha, Ju-Young Cho, Hyunchul Kim, Jiseong Lee, Taek-Soo Kim, Dae-Kyeom Kim, Myungsuk Song
Journal of Alloys and Compounds.2025; : 178711. CrossRef
A Review of the Current Progress in High-Temperature Recycling Strategies for Recovery of Rare-Earth Elements from Magnet Waste
Ali Zakeri, Leili Tafaghodi
Journal of Sustainable Metallurgy.2025;[Epub] CrossRef
Selective growth of Nb–Fe–B intermetallic compounds for the direct separation of rare earths based on manipulating liquation
Sangmin Park, Jaeyun Jeong, Seunghun Cha, Yoonhyung Keum, Ju-Young Cho, Hyungbeen Park, Taek-Soo Kim, Dae-Kyeom Kim, Myungsuk Song
Materials Today Sustainability.2024; 28: 101042. CrossRef
Separation and recovery Nd and Dy from Mg-REEs alloy by vacuum distillation
Sangmin Park, Dae-Kyeom Kim, Jaeyun Jeong, Jae Hong Shin, Yujin Kang, Rongyu Liu, Taek-Soo Kim, Myungsuk Song
Journal of Alloys and Compounds.2023; 967: 171775. CrossRef
The Supported Boro-Additive Effect for the Selective Recovery of Dy Elements from Rare-Earth-Elements-Based Magnets
Sangmin Park, Dae-Kyeom Kim, Javid Hussain, Myungsuk Song, Taek-Soo Kim
Materials.2022; 15(9): 3032. CrossRef
Influence of Dysprosium Compounds on the Extraction Behavior of Dy from Nd-Dy-Fe-B Magnet Using Liquid Magnesium
Sun-Woo Nam, Sang-Min Park, Mohammad Zarar Rasheed, Myung-Suk Song, Do-Hyang Kim, Taek-Soo Kim
Metals.2021; 11(9): 1345. CrossRef

A Study on Detection Characteristics of Cadmium and Lead for Bi Nanopowder-Labeled Electrode: Gyeoung-Ja Lee, Hyoun-Jin Kim, Hi-Min Lee, Sang-Hoon Lee, Min-Ku Lee, Chang-Kyu Lee; J Korean Powder Metall Inst. 2008;15(5):393-398.; DOI: https://doi.org/10.4150/KPMI.2008.15.5.393

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Abstract PDF: Trace analysis of Cd and Pb at surface modified thick film graphite electrode with Bi nanopowder has been carried out using square-wave anodic stripping voltammetry (SWASV) technique. Bi nanopowder synthesized by gas condensation (GC) method showed the size of 50sim100 nm with BET surface area, A_BET=6.8m2g-l. For a strong adhesion of the Bi nanopowder onto the screen printed carbon paste electrode, nafion solution was added into Bi-containing suspension. From the SWASV, it was found that the Bi nanopowder electrode exhibited a well-defined responses relating to the oxidations of Cd and Pb. The current peak intensity increased with increasing concentration of Cd and Pb. From the linear relationship between Cd/Pb concentrations and peak current, the sensitivity of the Bi nanopowder electrode was quantitatively estimated. The detection limit of the electrode was estimated to be 0.15µg/l and 0.07µg/l for Cd and Pb, respectively, on the basis of the signal-to-noise characteristics (S/N=3) of the response for the 1.0µg/l solution under a 10 min accumulation.

Characteristics of the Surface Coating Layer of Ti₅Si₃ Intermetallic Compound Obtained by Shock Compaction and Reaction Synthesis Through Underwater Shock Compression: Sang-Hoon Lee; J Korean Powder Metall Inst. 2008;15(2):101-106.; DOI: https://doi.org/10.4150/KPMI.2008.15.2.101

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Abstract PDF: The objective of the present study is to investigate the increase in the functional characteristics of a substrate by the formation of a thin coating layer. Thin coating layers of Ti_5Si_3 have high potential because Ti_5Si_3 exhibits high hardness. Shock induced reaction synthesis is an attractive fabrication technique to synthesize uniform coating layer by controlling the shock wave. Ti and Si powders to form Ti_5Si_3 using shock induced reaction synthesis, were mixed using high-energy ball mill into small scale. The positive effect of this technique is highly functional coating layer on the substrate due to ultra fine substructure, which improves the bonding strength. These materials are in great demand as heat resisting, structural and corrosion resistant materials. Thin Ti_5Si_3 coating layer was successfully recovered and showed high Vickers' hardness (Hv=1183). Characterization studies on microstructure revealed a fairly uniform distribution of powders with good interfacial integrity between the powders and the substrate.

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