Novel Extraction Process Of Rare Earth Elements From NdFeB Powders Via Alkaline Treatment

• Autorzy: Chung K. W. , Kim C.-J. , Yoon H.-S.

Identyfikatory

DOI

10.1515/amm-2015-0118

Warianty tytułu

PL

Nowy sposób ekstrakcji pierwiastków ziem rzadkich z proszków NdFeB w roztworach alkalicznych

• Języki publikacji: EN

Abstrakty

EN

The alkaline treatment of NdFeB powders in NaOH solution at various equivalent amounts of NaOH at 100°C was performed. The resultant powders were then leached in 0.5M H₂SO₄ solution at 25°C for 2 minutes. At 5 equivalents of NaOH, neodymium in NdFeB powders was partially transformed to neodymium hydroxide. The transformation of neodymium to neodymium hydroxide actually occurred at 10 equivalents of NaOH and was facilitated by increasing the equivalent of NaOH from 10 to 30. In addition, iron was partially transformed to magnetite during the alkaline treatment, which was also promoted at a higher equivalent of NaOH. The leaching yield of neodymium from alkaline-treated powders was increased with an increasing equivalent of NaOH up to 10; however, it slightly decreased with the equivalent NaOH of over 10. The leaching yield of iron was inversely proportional to that of rare earth elements. NdFeB powders treated at 10 equivalents of NaOH showed a maximum leaching yield of neodymium and dysprosium of 91.6% and 94.6%, respectively, and the lowest leaching yield of iron of 24.2%, resulting in the highest selective leaching efficiency of 69.4%.

Słowa kluczowe

EN

recycling; NdFeB magnet; alkaline treatment; leaching; selective leaching efficiency

PL

recykling; magnes neodymowy; obróbka alkaliczna; ługowanie; wydajność

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2015
• Tom: Vol. 60, iss. 2B
• Strony: 1301--1305
• Opis fizyczny: Bibliogr. 17 poz., rys., tab.

Twórcy

autor

Chung K. W.

• Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea

autor

Kim C.-J.

• Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea

autor

Yoon H.-S.

• Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.