Magnetic separation technique for environmental water purification by strong magnetic field generator loading HTS bulk magnets

T. Oka, K. Tanaka, T. Kimura, D. Mimura, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, K. Yokoyama, M. Yamaguchi

Research output: Contribution to journalArticle

9 Citations (Scopus)


The magnetic separation technique in combination with high temperature superconducting bulk magnets has been investigated to purify the ground water which has been used in the coolant system for the incinerator furnace to cool the burning gas. The experiment has been operated by means of the newly-built alternating channel type magnetic separating device. The separation ratios of ferromagnetic flocks including fine magnetite powder have been estimated by means of the high gradient magnetic separation method with small iron balls filled in the water channels. As the magnetic force acting on the magnetic particle is given by the product of a magnetization of the material and a gradient of magnetic field, and as the ferromagnetic stainless steel balls yield the steep gradient of magnetic field around them in a strong magnetic field, the system has exhibited a quite excellent performance with respect to the separation ratios. The separation ratios of the flocks which contain the magnetite powder with the values more than 50 ppm have remained over 80% for under the flow rates less than 5 L/min.

Original languageEnglish
Pages (from-to)1799-1803
Number of pages5
JournalPhysica C: Superconductivity and its applications
Issue number20
Publication statusPublished - 2010 Nov 1



  • Bulk superconductor
  • Magnetic field generator
  • Magnetic separation
  • Trapped field magnet

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

Cite this