Browse > Article
http://dx.doi.org/10.7844/kirr.2018.27.4.29

A Basic Study on Non-aqueous Electrolysis of Neodymium for Room-temperature Metallurgy  

Park, Jesik (Advanced Batteries Research Center, Korea Electronics Technology Institute)
Lee, Churl Kyoung (School of Advanced Materials Sci. & Eng., Kumoh National Institute of Technology)
Publication Information
Resources Recycling / v.27, no.4, 2018 , pp. 29-35 More about this Journal
Abstract
In this study, the electrochemical redox behavior of neodymium in non-aqueous electrolytes was investigated to confirm the possibility of neodymium metallurgy at room temperature. The non-aqueous electrolytes include ionic liquids such as $[C_4mim]PF_6$, $[C_4mim]Cl$, and $[P_{66614}]PF_6$, ethanol which are highly soluble in neodymium salts, and mixed electrolytes based on carbonate with highly electrochemical stability. The electrochemical redox properties of neodymium were better than those of other electrolytes in the case of the mixed electrolyte based on ethylene carbonate (EC)/di-ethylene carbonate (DEC). Ethanol was added to improve the physical properties of the mixed electrolyte. Thorough the analysis about ionic conductivity of EC/DEC ratio, ethanol content and $NdCl_3$ concentration, the best electrolyte composition was 50 vol% content of ethanol and 0.5 M of $NdCl_3$. Using cyclic voltametry and linear sweep voltametry, a current peak estimated at -3.8 V (vs. Pt-QRE) was observed as a limiting current of neodymium reduction. Potentiostatic electrolysis for 18 hours at room temperature at -6 V (vs. Pt-QRE) confirmed that metallic neodymium was electrodeposited.
Keywords
neodymium; room-temperature metallurgy; non-aqueous electrolyte; electrolysis;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 H. Azuma, H. Imoto, S. I. Yamada, and K. Sekai, 2010 : REE Resources and It's Utilization, Econ. Environ. Geol., 43, pp.505-516.
2 O. Gutfleisch, M. A. Willard, E. Bruck, C. H. Chen, S. G. Sankar, and J. P. Liu, 2011 : Magnetic materials and devices for the 21st century: stronger, lighter, and more energy efficient, Adv. Mater. 23, pp.821-823.   DOI
3 H. S. Choi and Y. H. Kim, 2010 : Recycling technology of Nd-Fe-B based rare earth element magnets, J. Kor. Powd. Met. Inst., 17, pp.435-442.   DOI
4 V. Prakash, Z. Sun, J. Sietsma, and Y. Yang, 2014 : Electrochemical recovery of rare earth elements from magnet scraps-a theoretical analysis, ERES2014, pp.163-170.
5 H. Ota, M. Matsumiya, T. Yamada, T. Fujita, and S. Kawakami, 2016 : Purification of rare earth bis(trifluoromethyl-sulfonyl)amide salts by hydrometallurgy and electrodeposition of neodymium metal using potassium bis(trifluoromethyl-sulfonyl)amide melts, Sep. Purif. Technol., 170, pp.417-426.   DOI
6 D. Kramer, 2010 : US seeks science ties to salve relations with Muslim world, Phys. Today, 63, pp.22-24.
7 S. V. Eliseeva and J. C. G. Buenzil, 2011 : Rare earths: jewels for functional materials of the future, New J. Chem., 35, pp.1165-1176.   DOI
8 K. A. Gschneidner Jr., 1980 : Rare earth speciality inorganic chemicals, Symposium on Speciality Inorganic Chemicals, 1980, Salford. Proceedings, The Royal Society of Chemistry, London, pp.403-443.
9 C. V. Sundaram, 1987 : Chemistry and metallurgy of rare earth metal extraction and applications, Trans. Indian Inst. Met. 40(6), pp.457-477.
10 J. C. Lee, W. B. Kim, J. K. Jeong, and I. J. Yoon, 1998 : Extraction of neodymium from Nd-Fe-B magnet scraps by sulfuric acid, J. of the Korean Inst. of Met. & Mater., 36, pp.967-971.
11 J. W. Lyman and G. R. Palmer, 1993 : Recycling of rare earths and iron from NdFeB magnet scrap, High Temp. Mat. Pr-Irs., 11, pp.175-185.
12 J. Park, Y. J. Jung, P. Kusumah, J. Lee, K. Kwon, and C. K. Lee, 2014 : Application of ionic liquids in hydrometallurgy, Int. J. Mol. Sci., 15, pp.15320-15343.   DOI
13 K. Nakashima, F. Kubota, T. Maruyama, and M. Goto, 2005 : Ind. Eng. Chem. Res., 44, pp.4368-4372.   DOI