Magnetic precipitate separation for Ni plating waste liquid using HTS bulk magnets

T. Oka, T. Kimura, D. Mimura, H. Fukazawa, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, K. Yokoyama, M. Tsujimura, T. Terasawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The magnetic separation experiment for recycling the nickel-bearing precipitates in the waste liquid from the electroless plating processes has been practically conducted under the high gradient magnetic separation technique with use of the face-to-face HTS bulk magnet system. A couple of facing magnetic poles containing Sm123 bulk superconductors were activated through the pulsed field magnetization process to 1.86 T at 38 K and 2.00 T at 37 K, respectively. The weakly magnetized metallic precipitates of Ni crystals and Ni-P compounds deposited from the waste solution after heating it and pH controlling. The high gradient magnetic separation technique was employed with the separation channels filled with the stainless steel balls with dimension of 1 and 3 mm in diameter, which periodically moved between and out of the facing magnetic poles. The Ni-bearing precipitates were effectively attracted to the magnetized ferromagnetic balls. We have succeeded in obtaining the separation ratios over 90% under the flow rates less than 1.35 L/min.

Original languageEnglish
Pages (from-to)325-328
Number of pages4
JournalPhysica C: Superconductivity and its applications
Publication statusPublished - 2013 Jan 15
Externally publishedYes


  • Bulk magnet
  • High temperature superconductor
  • Magnetic separation
  • Nickel plating
  • Waste solution

ASJC Scopus subject areas

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


Dive into the research topics of 'Magnetic precipitate separation for Ni plating waste liquid using HTS bulk magnets'. Together they form a unique fingerprint.

Cite this