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Development of novel magnetic filter for paramagnetic particles in high gradient magnetic separation
Nishijima, Shigehiro,Nomura, Naoki The Korean Society of Superconductivity and Cryoge 2022 한국초전도저온공학회논문지 Vol.24 No.3
We are conducting research and development of magnetic filters for magnetic separation targeting paramagnetic materials. In order to develop a new magnetic filter with a large magnetic gradient, stainless fiber (SUS430, 120 mm × 3 mm) with a triangular cross section was sintered with a high void ratio (~ 70%) and the magnetic filter (20 mm × 2 mm) was created. When this magnetic filter was used to perform magnetic separation of hematite (particle size 50 ㎛) under a maximum magnetic flux density of 1.49 T, high separation rates were obtained.
Nishijima, S. The Korea Institute of Applied Superconductivity a 2019 한국초전도저온공학회논문지 Vol.21 No.2
The superconducting magnetic separation system has been developing to separate the iron oxide scale from the feed water of the thermal power plant. The accumulation in the boiler lowers the heat exchange rate or in the worst case damages it. For this reason, in order to prevent scale generation, controlling pH and redox potential is employed. However, these methods are not sufficient and then the chemical cleaning is performed regularly. A superconducting magnetic separation system is investigated for removing iron oxide scale in a feed water system. Water supply conditions of the thermal power plant are as follows, flow rate 400 t / h, flow speed 0.2 m / s, pressure 2 MPa, temperature $160-200^{\circ}C$, amount of scale generation 50 - 120 t / 2 years. The main iron oxide scale is magnetite (ferromagnetic substance) and its particle size is several tens ${\mu}m$. As the first step we are considering to introduce the system to the chemical cleaning process of the thermal power plant instead of the thermal power plant itself. The current status of development will be reported.
Nishijima, Wataru,Okada, Mitsumasa,Shoto, Eiji 嶺南大學校 環境問題硏究所 1996 環境硏究 Vol.16 No.1
ABSTRACTThe purposes of this study are to clarify the behavior of phosphorus in coagulation/sedimentation process, and to evaluate the effects of phosphorus addition into biological activated carbon (BAC) treatment on the biodegradation of organic substances. Conventional coagulation/sedimentation reduced phosphorus concentration to very low level, that is, 0.002 - 0.004 mg P.I'1 in water containing less than 0.063 mg P.1"1. In continuous experiment, the biodegradation rate of glucose in the BAC with adsorbed phosphorus before the start of operation was 5 times higher than that in the BAC without adsorbed phosphorus. The rate of increase in bacterial population was higher in the BAC with adsorbed phosphorus compared to the BAC without adsorbed phosphorus. The biodegradation rate of glucose in the BAC without adsorbed phosphorus increased significantly by addition of phosphorus into influent. Therefore, growth and biodegradation activity of attached bacteria on BAC was limited by phosphorus of low concentration in influent treated by coagulation/sedimentation. Adsorption of phosphorus on activated carbon before the start of operation and/or addition of phosphorus in influent will be effective to improve the biological activity on BAC.
Nishijima, Wataru 한국수처리기술연구회 2003 한국수처리학회지 Vol.11 No.1
용존성 유기 탄소(DOC)를 제거하기 위한 다단계 오존-생물학적 처리공정이 음용수 처리를 위해 평가되었다. 그리고 이 공정이 전통적인 단일 오존-생물학적 처리공정과 비교되었다. 저수지수와 휴믹물질 용해수에 대해 동일한 오존처리 시간으로 다단계 오존-생물학적 처리공정이 보다 더 높은 DOC제거를 나타내었다. 다단계 오존-생물학적 처리공정에서 DOC제거율이 높은 이유는 오존에 의한 BDOC의 생산 때문이다. 오랜 시간의 오존 처리가 효율적으로 BDOC를 생산하지 못하는 이유는 전 단계에서 생성된 BDOC를 산화하는데 오존을 사용하기 때문이다.
Research and development of new magnetic filter for high gradient magnetic separation
Shigehiro Nishijima,Naoki Nomura,Fumihito Mishima 한국초전도저온학회 2023 한국초전도저온공학회논문지 Vol.25 No.3
We have been developing a new magnetic filter so that small sized paramagnetic substances can be separated even in a low magnetic field (lower than 2T). The developed filter is a packed ferromagnetic filament with a triangular cross section. The filament has a diameter of 120 μm and a length of 3 mm, and is mechanically packed with a volume ratio of 17.6%. Using this filter, a magnetic separation experiment of hematite was carried out using a superconducting magnet at the field of 2T. Similarly, magnetic separation was performed using a conventional magnetic filter. It became clear that the separation efficiency of newly developed filter is high as that of conventional mesh filter. The smaller sized hematite (<3μm) could be separated though conventional mesh filter could not separate.
S. Nishijima 한국초전도.저온공학회 2019 한국초전도저온공학회논문지 Vol.21 No.2
The superconducting magnetic separation system has been developing to separate the iron oxide scale from the feed water of the thermal power plant. The accumulation in the boiler lowers the heat exchange rate or in the worst case damages it. For this reason, in order to prevent scale generation, controlling pH and redox potential is employed. However, these methods are not sufficient and then the chemical cleaning is performed regularly. A superconducting magnetic separation system is investigated for removing iron oxide scale in a feed water system. Water supply conditions of the thermal power plant are as follows, flow rate 400 t / h, flow speed 0.2 m / s, pressure 2 MPa, temperature 160 - 200 ° C, amount of scale generation 50 - 120 t / 2 years. The main iron oxide scale is magnetite (ferromagnetic substance) and its particle size is several tens μm. As the first step we are considering to introduce the system to the chemical cleaning process of the thermal power plant instead of the thermal power plant itself. The current status of development will be reported.