Magnetic Separation of Phosphate and Heavy Metal Ions Using Ferrimagnetic Particles for Water Purification.*

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  • GOKON Nobuyuki
    Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology
  • SHIMADA Ayano
    Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology
  • MATSUOKA Takahito
    Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology
  • KANEKO Hiroshi
    Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology
  • TAMAURA Yutaka
    Research Center for Carbon Recycling & Utilization, Tokyo Institute of Technology
  • OHARA Takeshi
    Tsukuba Magnet Laboratory, Materials Engineering Laboratory, National Institute for Materials Science

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  • フェリ磁性体を用いた環境水中のリン及び重金属イオンの磁気分離
  • フェリ ジセイタイ オ モチイタ カンキョウ スイチュウ ノ リン オヨビ ジュウキンゾク イオン ノ ジキ ブンリ

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Abstract

To develop a practical environmental protection technology for purification of lakes, ponds and arm of the sea, an efficient magnetic separation system for phosphate and heavy metal ions removal was studied using ferrimagnetic fine particles (FMFP), which can be prepared from Fe2+ and Fe3+ ions in the alkali aqueous solution. With the Fe3+ ions of 15 mg·l-1 (without addition of FMFP), the phosphate ion recovery decreased from 80% to 20% with decreasing the magnetic field from H=8T to 0.8T. By addition of the FMFP of 5 mg·l-1 along with the Fe3+ ions of 15 mg·l-1, above 95% recovery was achieved in a wide range of the magnitude of magnetic field (H=0.8-8T). In case of using cadmium ion instead of the phosphate ion, addition of the FMFP of 5 mg·l-1 together with the Fe3+ ions of 20 mg·l-1 enhanced recovery of the Cd2+ ion. We demonstrated that in the presence of the FMFP all of the heavy metal ions were recovered 80% yields or more. These would come from a high magnetic gradient characteristically generated on the surface of FMFP, which results in the enhancement of the magnetic coagulation of the complex with the phosphate or the heavy metal ions and the Fe3+ ions.

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