Magnetic separation technique using high temperature superconducting bulk magnets and application to plating liquid waste treatment

Tetsuo Oka, H. Fukazawa, N. Yoshizawa, Y. Takayanagi, J. Ogawa, S. Fukui, T. Sato, M. Ooizumi, M. Tsujimura, K. Yokoyama

Research output: Contribution to journalArticle

Abstract

A magnetic separation technique has been conducted to recycle the nickel (Ni) element from the waste fluid of electroless Ni plating processes. The experiment was operated using the face-to-face type electromagnet generating 1.96 T and the data was compared to those in the case of the high temperature superconducting bulk magnet which generates 3.45 T. In the electroless plating processes, the plating fluid containing high concentration of Ni ions is disposed after several turns of the plating cycles when the concentration of phosphite ions exceeds a certain level. In order to extract the Ni element at first, we formed the coarse Ni-sulfate crystals with the sizes over 1 mm from the Ni-phosphite precipitates by controlling the temperature and the pH value. Next, the magnetic separation experiments were operated to collect the Ni-bearing precipitate which carried the weak magnetism. Although the performance of high temperature superconducting bulk magnet is superior to that of electromagnets, as a result, we succeeded in collecting Ni-sulfate crystals preferentially to the Ni-phosphite precipitates soon after the crystal growth began.

Original languageEnglish
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume61
Issue numberSUPLL.1
DOIs
Publication statusPublished - 2014 Jan 1
Externally publishedYes

Fingerprint

Magnetic separation
Waste treatment
Nickel
Plating
Magnets
Phosphites
Liquids
Nickel sulfates
Precipitates
Electromagnets
Electroless plating
Temperature
Bearings (structural)
Ions
Nickel plating
Crystals
Fluids
Magnetism
Crystallization
Crystal growth

Keywords

  • Bulk superconductor
  • Electroless plating
  • Magnetic separation
  • Nickel compound
  • Waste liquid

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Magnetic separation technique using high temperature superconducting bulk magnets and application to plating liquid waste treatment. / Oka, Tetsuo; Fukazawa, H.; Yoshizawa, N.; Takayanagi, Y.; Ogawa, J.; Fukui, S.; Sato, T.; Ooizumi, M.; Tsujimura, M.; Yokoyama, K.

In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy, Vol. 61, No. SUPLL.1, 01.01.2014.

Research output: Contribution to journalArticle

Oka, Tetsuo ; Fukazawa, H. ; Yoshizawa, N. ; Takayanagi, Y. ; Ogawa, J. ; Fukui, S. ; Sato, T. ; Ooizumi, M. ; Tsujimura, M. ; Yokoyama, K. / Magnetic separation technique using high temperature superconducting bulk magnets and application to plating liquid waste treatment. In: Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy. 2014 ; Vol. 61, No. SUPLL.1.
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