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Effect of Mg Ratio on the Extraction of Dy from (Nd,Dy)-Fe-B Permanent Magnet Using Liquid Mg

Park Sang-Min, Nam Sun-Woo, Cho Ju-Young, Lee Sang-Hoon, Hyun Seung-Keun, Kim Taek-Soo

Archives of Metallurgy and Materials

2020

Vol. 65, iss. 4

1281--1285

Recently, since the demand of rare earth permanent magnet for high temperature applications such as an electric motor has increased, dysprosium (Dy), a heavy rare earth element, is becoming important due to severe bias in its production. To fulfillthe increasing need of Dy, recycling offers as a promising alternative. In recycling of rare earths, Hydro-metallurgical extraction method is mainly used however it has adverse environmental effects. Liquid metal extraction on the other hand, is an eco-friendly and simple method as far as the reduction of rare earth metal oxide is concerned. Therefore, liquid metal extraction was studied in this research as an alternative to the hydro-metallurgical recycling method. Magnesium (Mg) is selected as solvent metal because it doesn’t form intermetallic compounds with Fe, B and has a low melting and low boiling point. Extraction behavior of Dy in (Nd,Dy)-Fe-B magnet is observed and effect of Mg ratio on extraction of Dy is confirmed.

Badania reakcji dehydratacji kompleksów prazeodymu(III), neodymu(III), europu(III), gadolinu(III), dysprozu(III) i erbu(III) z kwasem kwercetyno-5'-sulfonowym

Kopacz M., Nowak D.

Zeszyty Naukowe Politechniki Rzeszowskiej. Chemia

1999

z. 16 [173]

45-49

Przeprowadzono syntezę oraz badania derywatograficzne kompleksów jonów Pr(III), Nd(III), Eu(III), Gd(III), Dy(III), Er(III) z kwasem kwercetyno-5'sulfonowym i wyznaczono ich energię aktywacji (Ea) reakcji dehydratacji. Stwierdzono, że kompleksy prazeodymu, neodymu, gadolinu i erbu mają większe wartości energii aktywacji niż kompleksy europu i dysprozu.

Thermogravimetric analysis complexes of Pr(III), Nd(III), Eu(III), Gd(III), Dy(III) and Er(III) ions with quercetin-5'-sulfonic acid were carried out. Activation energy (Ea) reaction of dehydration was appointed. It was stated, that complexes of praseodymium, neodymium, gadolinium and erbium had higher values of activation energy than complexes of europium and dysprosium.