Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Magnetic separation device for paramagnetic materials operated in a low magnetic field

  • Mishima, F. (Department of Applied Nuclear Technology, Fukui University of Technology) ;
  • Nomura, N. (Department of Applied Nuclear Technology, Fukui University of Technology) ;
  • Nishijima, S. (Department of Applied Nuclear Technology, Fukui University of Technology)
  • Received : 2022.08.01
  • Accepted : 2022.09.14
  • Published : 2022.09.30
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Abstract

We have been developing a magnetic separation device that can be used in low magnetic fields for paramagnetic materials. Magnetic separation of paramagnetic particles with a small particle size is desired for volume reduction of contaminated soil in Fukushima or separation of iron scale from water supply system in power plants. However, the implementation of the system has been difficult due to the needed magnetic fields is high for paramagnetic materials. This is because there was a problem in installing such a magnet in the site. Therefore, we have developed a magnetic separation system that combines a selection tube and magnetic separation that can separate small sized paramagnetic particles in a low magnetic field. The selection tube is a technique for classifying the suspended particles by utilizing the phenomenon that the suspended particles come to rest when the gravity acting on the particles and the drag force are balanced when the suspension is flowed upward. In the balanced condition, they can be captured with even small magnetic forces. In this study, we calculated the particle size of paramagnetic particles trapped in a selection tube in a high gradient magnetic field. As a result, the combination of the selection tube and HGMS (High Gradient Magnetic Separation-system) can separate small sized paramagnetic particles under low magnetic field with high efficiency, and this paper shows its potential application.

Keywords

Acknowledgement

This work was supported by a 2020-2021 Kanai Gakuen Researcher Grant.

References

  1. N. Nomura, F. Mishima, S. Nishijima, "Development of Novel Magnetic Separation for Paramagnetic Particles Using the Selection Tube", IEEE Trans. on Appl. Supercond., Vol.32, (6), 3700204 (2022).
  2. K. Yukumatsu, N. Nomura, F. Mishima, Y. Akiyama and S. Nishijima. "Study on Volume Reduction of Cesium Contaminated Soil by Magnetic Separation", IEEE Trans. on Appl. Supercond., Vol.26, (4), 3700604 (2016).
  3. K.Akiyama,T. Mori,T. Terai,Y. Akiyama,H. Okada,N. Hirota, T. Yamaji, H. Matsuura, S. Namba,T.Sekine, F.mishima and S. Nishijima, "Removal of Iron Oxide Scale from Boiler Feed-Water in Thermal Power Plant by Magnetic Separation-Separation Conditions of Oxygenated Treatment Scale", IEEE Trans. on Appl. Supercond., Vol.31, (5), 3700204(2021).
  4. J. Hidaka, "Wet-Classification of Fine Powder", Journal of the Research Association of Powder Technology, Japan, 13[2], 81-94 (1976). https://doi.org/10.4164/sptj1964.13.81
  5. M.Tunekawa, et al., "Technological developments in wet gravity separation prosess", The Mining and Materials Processing Institute of Japan, Shigen-to-Sozai, Vol.121, 467-473 (2005).