Magnetic Separation for Recovering Ni Compounds from Plating Waste with Use of HTS Bulk Magnets

Tetsuo Oka, Y. Takayanagi, S. Machida, K. Ichiju, S. Fukui, J. Ogawa, T. Sato, M. Ooizumi, M. Tsujimura, K. Yokoyama

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A characteristic magnetic separation technique has been developed to recycle the Ni resource from the waste fluid of electroless Ni-plating processes. Since the plating waste still contains high concentration of Ni ions after several cycles of plating processes, the magnetic separation experiments were conducted to collect the precipitates containing Ni compounds. After extracting the fine NiHPO3 precipitate from the waste liquid, we synthesized the NiSO4 crystals from the NiHPO3 precipitates through the reaction with the concentrated sulfuric acid. The open-gradient magnetic separation was employed to separate the NiSO4 crystals from the mixed slurry composed of the NiSO4 and the NiHPO3 due to the difference between their magnetic properties. The experiments were practically conducted with use of the Gd123-based HTS bulk magnets with very steep gradient of magnetic field of over 100 T/m, which were activated to the magnetic fields of 1.53 and 1.95 T by the pulsed field magnetization process operated at 35 K. The ratio of NiSO4 content in the collected slurry attracted to the magnetic poles reached up to 98%, which suggests that the paramagnetic NiSO4 crystals are preferentially collected by the magnetic force from the mixed slurry in the strong magnetic field generated by the HTS bulk magnet.

Original languageEnglish
Article number7383257
JournalIEEE Transactions on Applied Superconductivity
Volume26
Issue number4
DOIs
Publication statusPublished - 2016 Jun 1
Externally publishedYes

Fingerprint

Magnetic separation
plating
Plating
Magnets
Precipitates
precipitates
magnets
Magnetic fields
Crystals
magnetic fields
liquid wastes
crystals
magnetic poles
gradients
sulfuric acid
Sulfuric acid
Poles
Magnetization
Magnetic properties
resources

Keywords

  • Bulk superconductor
  • electroless plating
  • magnetic separation
  • nickel compound
  • waste liquid

ASJC Scopus subject areas

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

Cite this

Magnetic Separation for Recovering Ni Compounds from Plating Waste with Use of HTS Bulk Magnets. / Oka, Tetsuo; Takayanagi, Y.; Machida, S.; Ichiju, K.; Fukui, S.; Ogawa, J.; Sato, T.; Ooizumi, M.; Tsujimura, M.; Yokoyama, K.

In: IEEE Transactions on Applied Superconductivity, Vol. 26, No. 4, 7383257, 01.06.2016.

Research output: Contribution to journalArticle

Oka, T, Takayanagi, Y, Machida, S, Ichiju, K, Fukui, S, Ogawa, J, Sato, T, Ooizumi, M, Tsujimura, M & Yokoyama, K 2016, 'Magnetic Separation for Recovering Ni Compounds from Plating Waste with Use of HTS Bulk Magnets', IEEE Transactions on Applied Superconductivity, vol. 26, no. 4, 7383257. https://doi.org/10.1109/TASC.2016.2517923
Oka, Tetsuo ; Takayanagi, Y. ; Machida, S. ; Ichiju, K. ; Fukui, S. ; Ogawa, J. ; Sato, T. ; Ooizumi, M. ; Tsujimura, M. ; Yokoyama, K. / Magnetic Separation for Recovering Ni Compounds from Plating Waste with Use of HTS Bulk Magnets. In: IEEE Transactions on Applied Superconductivity. 2016 ; Vol. 26, No. 4.
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