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RISS 인기검색어
- 검색키워드
- 저자 : F. Mishima (검색결과 5 건)
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F. Mishima,Aoi Nagahama,N. Nomura,S. Nishijima 한국초전도저온학회 2023 한국초전도저온공학회논문지 Vol.25 No.3
Magnetic separation technology for small paramagnetic particles has been desired for the volume reduction of contaminated soil from the Fukushima nuclear power plant accident and for the separation of scale and crud from nuclear power plants. However, the magnetic separation for paramagnetic particles requires a superconducting high gradient magnetic separation system applied, hence expanding the bore diameter of the magnets is necessary for mass processing and the initial and running costs would be enormous. The use of high magnetic fields makes safe onsite operation difficult, and there is an industrial need to increase the magnetic separation efficiency for paramagnetic particles in as low a magnetic field as possible. Therefore, we have been developing a magnetic separation system combined with a selection tube, which can separate small paramagnetic particles in a low magnetic field. In the previous technique we developed, a certain range of particle size was classified, and the classified particles were captured by magnetic separation. In this new approach, the fluid control method has been improved in order to the selectively classify particles of various diameters by using a multi-stage selection tube. The soil classification using a multi-stage selection tube was studied by calculation and experiment, and good results were obtained. In this paper, we report the effectiveness of the multi-stage selection tube was examined.
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Magnetic separation device for paramagnetic materials operated in a low magnetic field
F. Mishima,N. Nomura,S. Nishijima 한국초전도저온학회 2022 한국초전도저온공학회논문지 Vol.24 No.3
We have been developing a magnetic separation device that can be used in low magnetic fields for paramagnetic materials. Magnetic separation of paramagnetic particles with a small particle size is desired for volume reduction of contaminated soil inFukushima or separation of iron scale from water supply system in power plants. However, the implementation of the system hasbeen difficult due to the needed magnetic fields is high for paramagnetic materials. This is because there was a problem in installingsuch a magnet in the site. Therefore, we have developed a magnetic separation system that combines a selection tube and magneticseparation that can separate small sized paramagnetic particles in a low magnetic field. The selection tube is a technique forclassifying the suspended particles by utilizing the phenomenon that the suspended particles come to rest when the gravity actingon the particles and the drag force are balanced when the suspension is flowed upward. In the balanced condition, they can becaptured with even small magnetic forces. In this study, we calculated the particle size of paramagnetic particles trapped in aselection tube in a high gradient magnetic field. As a result, the combination of the selection tube and HGMS (High GradientMagnetic Separation-system) can separate small sized paramagnetic particles under low magnetic field with high efficiency, andthis paper shows its potential application.
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Study of the separation method of structural isomer using Magneto-Archimedes method
Mori, T.,Kobayashi, T.,Mishima, F.,Akiyama, Y.,Nishijima, Shigehiro The Korea Institute of Applied Superconductivity a 2016 한국초전도저온공학회논문지 Vol.18 No.1
Organic compounds have a problem that the separation of structural isomer in the preparation process requires high energy consumption. This study proposes a new separation method of structural isomer using Magneto- Archimedes method. Firstly, the levitation height of 1, 6-DDA and 1, 10-DDA was respectively calculated by simulation of the forces acting on the particles under magnetic field, and it was indicated that they could be separated by the difference of levitation height. To confirm the phenomenon experimentally, white powders of 1, 6-DDA and 1, 10-DDA were formed into pellets, and were soaked in manganese chloride solution. Then the solution was put on the center of the cryostat of HTS bulk magnet (maximum magnetic flux density is 3T). As a result, it was confirmed that the separation of structural isomer by difference of levitation height could be possible.
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Separation of Micro-plastics from Sea Water Using Electromagnetic Archimedes Force
N. Nomura,F.Mishima,S.Nishijima 한국초전도저온학회 2023 한국초전도저온공학회논문지 Vol.25 No.3
Pollution of the environment by micro-plastics is now a worldwide problem. Plastics are difficult to decompose and put a greatload on the marine environment. Especially a plastic with a size of 5 mm or less is defined as micro-plastic and are carried by oceancurrents over long distances, causing global pollution. These are not easily decomposed in the natural environment. In this paper,we aimed to experimentally demonstrate that micro-plastics in seawater can be continuously separated by electromagneticArchimedes force. Using polyethylene particles of 3 mm in diameter as the separation target, a flow channel was fabricated andseparation conditions were investigated by particle trajectory calculations for separation experiments. Based on the calculationresults, a solenoid-type superconducting magnet was used as a source of magnetic field to conduct separation experiments of micro-plastics in seawater. Although a high separation rate was assumed in the simulation results, the experimental results did not showany significant improvement in the separation rate due to the electromagnetic Archimedes force. It was found that the gas generatedby the electrolytic reaction may have inhibited the migration of the particles.
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