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A Study on the Characterization of Neodymium Oxalate by Reaction Crystallization  

Yoon, Ho-Sung (Division of Minerals Utilization and Materials, Korea Institute of Geoscience and Mineral Resources)
Kim, Chul-Joo (Division of Minerals Utilization and Materials, Korea Institute of Geoscience and Mineral Resources)
Kim, Joon-Soo (Division of Minerals Utilization and Materials, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Resources Recycling / v.13, no.5, 2004 , pp. 37-44 More about this Journal
Abstract
In this study, neodymium oxalate powders were prepared by injecting oxalic acid to the neodymium chloride solution resulted from the acid leaching solution of NdFeB magnet scrap. The effect of experimental conditions on the characteristics of neodymium oxalate powders were investigated. Neodymium oxalate was aggregated by primary particles formed by nucleation, and average size of aggregates was affected by experimental conditions. In a constant volume, increase of reactants affected the average size of aggregate formed by collision of primary particles. In a constant concentration of reactants, agitation speed decreased the size of aggregate due to breakage of particles attached on the surface of aggregate. The number of primary particles decreased with increasing reaction temperature, and the size of aggregates decreased due to the decrease of collision probability. From the results of decomposition behavior of neodymium oxalate, oxalate decomposed from $400^{\circ}C$, and neodymium oxide began to crystallize at above $620^{\circ}C$.
Keywords
NdFeB magnet; scrap; reaction crystallization; neodymium oxalate; neodymium oxide;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Macy, J. C., Cournil, M., 1991 : 'Using a turbidimetric method to study the kinetics of agglomeration of potassium sulfate in a liquid medium'. Chemical Engineering Science, 46. pp. 693-701   DOI   ScienceOn
2 Brown, T. L., LeMay, H. E. Jr., and Bursten, B. E.. 1994 : 'Chemistry', 6th ed., Prentice-HalI, New Jersey, pp. 66-74
3 Sung, M. H., Choi. I. S., Kim, J. S., and Kim, W. S., 2000: 'Agglomeration of Yttrium oxalate particles produced by reaction precipitation in semi-batch reactor'. Chemical Engineering Science, 55, pp. 2173-2184   DOI   ScienceOn
4 Yoon, H. S. et al., 2003 : 'Separation of neodymium from NdFeB permanent magnet scrap', J. of Korean Inst. of Resources Recycling, 12(6), pp. 57-63
5 Xu Y., Chumbly L. S., and Laabs F. C., 2000 : 'Liquid metal extraction of Nd from NdFeB magnet scrap', J. Mater. Res., 15(11), pp. 2296-2304   DOI
6 Yoon, H. S. et al.. 2001 : 'Preparation of High Grade Cerium Compounds'. Technical Report of MOCIE, 1999R-ME01-P-03