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Improvement of brightness of kaolin by superconducting magnetic separation and characterization of the impurities

Published online by Cambridge University Press:  27 February 2018

Y. Li ,
H. Jiang ,
W. Zhang  and
L. Xu
Y. Li*
Affiliation:
Department of Water Resources and Environmental Engineering, East China Institute of Technology, Nanchang, Jiangxi, 344000, PR China Non-Traditional Security Center of East China Institute of Technology, East China Institute of Technology, Nanchang, 330012, Jiangxi, PR China
H. Jiang
Affiliation:
Department of Water Resources and Environmental Engineering, East China Institute of Technology, Nanchang, Jiangxi, 344000, PR China
W. Zhang
Affiliation:
Department of Water Resources and Environmental Engineering, East China Institute of Technology, Nanchang, Jiangxi, 344000, PR China
L. Xu
Affiliation:
Department of Water Resources and Environmental Engineering, East China Institute of Technology, Nanchang, Jiangxi, 344000, PR China
*
*E-mail: [email protected]
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Abstract

In the present study, changes of iron content, brightness, particle size, mineralogy and paramagnetic properties of kaolins before and after superconducting high gradient magnetic separation (SHGMS) were investigated. The Fe2O3 contents of the feed decreased by 56% after 3.5T SHGMS with 1# steel wool, but higher magnetic intensity to 5.5T did not remove additional iron. The ISO brightness of the kaolin sample after SHGMS was improved from 56.9% to 76.7%. The D50 value of the magnetic rejects was 35% larger compared to the feed. Large particles might block the micro-pores in the steel wool matrix. Compared to the feed, the dark or red impurities significantly decreased in the non-magnetic product. Paramagnetic species in the kaolin sample were sensitive to SHGMS. The resonances at g = ~2.0 and g = 4.0 decreased significantly in the concentrate compared to the feed in the ESR spectra. Iron components in the non-magnetic product were more likely to be non-paramagnetic. The results are useful for understanding the SHGMS in kaolin treatment, and might be a guide for optimizing process parameters.

Keywords

kaolinimpuritiessuperconductinghigh gradient magnetic separation
Type
Research Article
Information
Clay Minerals , Volume 49 , Issue 5 , December 2014 , pp. 693 - 702
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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References

Angel, B., Jones, J. & Hall, P.L. (1974) Electron spin resonance studies of doped synthetic kaolinite: I. Clay Minerals, 10, 247–255.Google Scholar
Angel, B. & Vincent, W. J (1978) electron spin resonance studies of iron oxides associated with the surface of kaolins. Clays and Clay Minerals, 26, 263–272.Google Scholar
Balan, E., Allard, T., Boizot, B., Morin, G. & Muller, J.P. (2000) Quantitative measurement of paramagnetic Fe3+ in kaolinite. Clays and Clay Minerals, 48, 439–445.CrossRefGoogle Scholar
Bertolino, L.C., Rossi, A.M., Scorzelli, R.B. & Torem, M.L. (2010) Influence of iron on kaolin whiteness: An electron paramagnetic resonance study. Applied Clay Science, 49, 170–175.CrossRefGoogle Scholar
Cieśla, A. (2003) Practical aspects of high gradient magnetic separation using superconducting magnets. Physicochemical Problems of Mineral Processing, 37, 169–181.Google Scholar
Dai, J. (2009) Study on Enhancing the Whiteness of Kaolin by Bleaching and Calcining (Master thesis, in Chinese). Xiamen University, 30–31.Google Scholar
Donelson, R., Paul, G., Ciacchi, F. & Badwal, S. (2014) Permeation and strength characteristics of macroporous supports for gas separation produced by cosintering mixtures of a-alumina and kaolin. Journal of Membrane Science, 463, 126–133.Google Scholar
Goodman, B.A. & Hall, P.L. (1994) Electron paramagnetic resonance spectroscopy. Pp. 173–225 in: Clay Mineralogy: Spectroscopic and Chemical Determinative Methods (M.J. Wilson, editor). Chapman & Hall, London.Google Scholar
Iannicelli, J. & Pechin, J. (2000) Magnetic separation of kaolin clay using an advanced 9 t separator. Applied Superconductivity, IEEE Transactions on, 10, 917–922.Google Scholar
Iannicelli, J., Pechin, J., Ueyama, M., Ohkura, K., Hayashi, K., Sato, K., Lauder, A. & Rey, C. (2002) Magnetic separation of kaolin clay using a high temperature superconducting magnet system. Applied Superconductivity, IEEE Transactions on, 7, 1061–1064.Google Scholar
Jackson, D. (2013) Processing of china clays using a commercial-scale, conduction-cooled superconducting magnetic separation system. Magnetics, IEEE Transactions on, 49, 3438–3440.Google Scholar
Jones, J., Angel, B. & Hall, P.L. (1974) Electron spin resonance studies of doped synthetic kaolinite. II. Clay Minerals, 10, 257–270.Google Scholar
Komnitsas, K. & Zaharaki, D. (2007) Geopolymerisation: A review and prospects for the minerals industry. Minerals Engineering, 20, 1261–1277.Google Scholar
Lόpez-Vizcaíno, R., Alonso, J., Can˜izares, P., Leόn, M., Navarro, V., Rodrigo, M. & Sáez, C. (2014) Removal of phenanthrene from synthetic kaolin soils by eletrokinetic soil flushing. Separation and Purification Technology, 132, 33–40.Google Scholar
Murray, H.H. (2000) Traditional and new applications for kaolin, smectite, and palygorskite: A general overview. Applied Clay Science, 17, 207–221.Google Scholar
Murray, H. (2002) Industrial clays case study. Mining, Minerals and Sustainable Development, 64, 1–9.Google Scholar
Newns, A. & Pascoe, R.D. (2002) Influence of path length and slurry velocity on the removal of iron from kaolin using a high gradient magnetic separator. Minerals Engineering, 15, 465–467.Google Scholar
Raghavan, P., Chandrasekhar, S. & Ramaswamy, S. (2000) Processing of china clay by super-conducting high gradient magnetic separation. International Symposium on Processing of Fines, 108–113.Google Scholar
Raghavan, P., Chandrasekhar, S., Vogt, V., Gock, E. & Suresh, N. (2007) Additional investigations on the separation of titanoferrous impurities from kaolin by high shear pretreatment and froth flotation - part 1. Applied Clay Science, 38, 33–42.Google Scholar
Svoboda, J. (1994) The effect of magnetic field strenght on the efficiency of magnetic separation. Minerals Engineering, 7, 747–757.Google Scholar
Watson, J. (1994) Status of superconducting magnetic separation in the minerals industry. Minerals Engineering, 7, 737–746.Google Scholar
Zhang, Y., Wang, J., Luo, S. & Mi, J. (2013) Investigation on mineralogical properties of magnetic separation tailings of the Fe-contaminated kaolin from Longhai, Zhangzhou, Fujian Province. Journal of Xiamen University (Natural Science), 52, 91–97 (in Chinese).Google Scholar