Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Study on separation of nonferrous metal utilizing magneto-Archimedes method

  • Ito, Yusuke (Graduate school of engineering, Osaka University) ;
  • Akiyama, Yoko (Graduate school of engineering, Osaka University)
  • Received : 2019.01.16
  • Accepted : 2019.06.21
  • Published : 2019.06.30
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Abstract

In order to improve resource value, separation of nonferrous metals obtained from crushed materials of home appliances is required. In this study, we aimed to develop a continuous separation system by magneto-Archimedes method using magnetic fluid as a medium and the permanent magnet as a magnetic field source. Firstly, the separation conditions were examined in which only copper is settled and the difference in levitation positions between aluminum and other metals are over 1 cm. Based on the results, levitation experiment of each metal and separation experiment from the mixture of nonferrous metals were confirmed. The separation experiment showed that the continuous separation of copper and aluminum from a mixture of nonferrous metals is possible.

Keywords

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Fig. 1. The processing flow of the waste home appliances.

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Fig. 2. Magnetization curves of the magnetic fluid (ferricolloid 1003S) and MnCl2 aqueous solution (41 wt. %).

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Fig. 3. Conceptual illustrations of magneto-Archimedes effect; (a) the force acting on the diamagnetic particles in the magnetic fluid (b) The force acting on the magnetic fluid.

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Fig. 4. The analysis result of magnetic field distribution with facing permanent magnets.

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Fig. 5. The relationship between the distance in vertical direction and reaction force of magnetic force acting on the magnetic fluid.

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Fig. 6. Schematic diagram of a possible continuous separating system (a) Stereographic view (b) Side view.

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Fig. 8. The state of recovered nonferrous metals by partitions.

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Fig. 9. Calculation of particle trajectories.

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Fig. 7. (a) Schematic diagram of separating experiment and (b) a face-type magnets used in the separating experiment.

TABLE I THE DENSITY AND THE VOLUME MAGNETIC SUSCEPTIBILITY OF NONFERROUS METALS INCLUDED IN THE HOME ELECTRICAL APPLIANCES WASTE.

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TABLE II THEORETICAL AND MEASURED VALUES OF LEVITATING HEIGHTS OF NONFERROUS METALS.

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TABLE III NUMBER OF NONFERROUS METALS RECOVERED IN EACH PARTITION.

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References

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