• Title/Summary/Keyword: High Gradient Magnetic Separator

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Superconducting high gradient magnetic separation for magnetic substance at sludge powder of hot rolled coolant

  • Kwon, Jun-Mo;Ha, Dong-Woo;Kim, Tae-Hyung;Cho, Mun-Dak;Choi, Woo-Hyuk
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.353-353
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    • 2009
  • It is an important task to construct a recycling society with a low damage on the environment in our century. Magnetic separation is expected to be applied for the industrial waste treatment as an important supporting technology. In the magnetic separation of dry condition, the cohesive force between particles is strong compared with that in the wet condition's magnetic separation. The use of high magnetic field by the superconducting magnet enhances the powder's magnetic substance capture ability of the magnetic separation. In this study, the POSCO's coolant sludge of hot rolled steel was used for the superconducting magnetic separation of dry condition. Cryo-cooled NB-Ti superconducting magnet with 100 mm room temperature bore and 600 mm of height was used for magnetic separator.

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Superconducting Magnetic Separator for Purification of Industrial Wastewater (산업폐수의 수처리를 위한 초전도 자기분리 장치 제작)

  • Ha, Dong-Woo;Kwon, Jun-Mo;Ko, Rock-Kil;Baik, Seung-Kyu;Sohn, Myung-Hwan;Lee, Yu-Jin;Kim, Tae-Hyung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2010.06a
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    • pp.44-44
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    • 2010
  • Conventional water treatment facilities like precipitation process need large-scale equipment and wide space to purify the wastewater of paper factory. In case of massive waste water, high gradient magnetic separation (HGMS) parts are more effective to purify it rapidly and to occupy relatively small space, since large voids at filter with HGMS are adopted. Cryo-cooled Nb-Ti superconducting magnet with room temperature bore in diameter of 100 mm and 600 mm in height was used for magnetic separator. Magnetic filters were designed by the analysis of magnetic field distribution at superconducting magnets.

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Study on the Purification of Wastewater by Superconducting HGMS for Steelmaking Industry (제철 폐수의 고구배 자기분리HGMS(High Gradient Magnetic Seperation) 처리에 관한 연구)

  • Kim, Tae-Hyung;Ha, Dong-Woo;Oh, Sang-Soo;Ha, Tae-Wook;Kim, Young-Hun;Kang, Chae-Hun
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2008.11a
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    • pp.360-360
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    • 2008
  • Steelmaking industry is widely known to use a lot of water and same amount of wastewater is generated. Although toxicity of wastewater from Steelmaking industry is low, it contains an amount of various organic materials and Fe-Oxides. It is important to recycle the wastewater because of water shortages and water pollution. In general, large-scale equipment is necessary to process the wastewater. On the other hand, superconducting high gradient magnetic separation (HGMS) system can process the wastewater in the small space. Superconducting HGMS system that had a purpose to purify the wastewater was assembled. Cryo-cooled Nb-Ti superconducting magnet was used for magnetic separator. This system can operate continuously because contaminated filters can keep on returning after cleaning. The various magnetic seeding reactions were investigated to increase the reactivity of coagulation. Filter cleaning system was developed to decrease the quantity of clean water. This research was supported by a grant from Korea Electrotechnology Research Institute, Republic of Korea.

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Purification of wastewater from paper factory by cryo-cooled high-$T_c$ superconducting magnetic separator (전도냉각형 고온초전도 자석을 이용한 제지폐수의 자기분리에 의한 정수)

  • Ha, Dong-Woo;Kim, Tae-Hyung;Sohn, Myung-Hwan;Kwon, Jun-Mo;Baik, Seung-Kyu;Oh, Sang-Soo;Ko, Rock-Kil;Ha, Hong-Soo;Kim, Ho-Sup;Kim, Young-Hun;Kang, Che-Hun;Ha, Tae-Wook
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.05a
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    • pp.4-4
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    • 2009
  • Paper factories use a large amount of water and same amount of wastewater is generated. It is important to recycle the wastewater because of water shortages and water pollution. The existing water treatment facilities like precipitation process need large-scale equipment and wide space to purify the wastewater of paper factory. High gradient magnetic separation (HGMS) system has the merits to purify rapidly because of large voids at filter and to occupy small space. In this paper, two types of superconducting magnets were used for HGMS systems. Cryo-cooled Bi-2223 superconducting magnet system with 70 mm room temperature bore and 200 mm of height was prepared. Cryo-cooled Nb-Ti superconducting magnet with 100 mm room temperature bore and 600 mm of height was used for magnetic separator. Magnetic filters were designed by the analysis of magnetic field distribution at superconducting magnets. The various magnetic seeding reactions were investigated to increase the reactivity of coagulation. The effects of magnetic separation of wastewater were investigated as variation of magnetic field strength and flow rate of wastewater.

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Purification of wastewater from paper factory by superconducting magnetic separator (초전도 자기분리에 의한 제지폐수의 정수)

  • Ha, Dong-Woo;Kim, Tae-Hyung;Kwon, Jun-Mo;Sohn, Myung-Hwan;Baik, Seung-Kyu;Oh, Sang-Soo;Ha, Hong-Soo;Ko, Rock-Kil;Kim, Ho-Sup;Kim, Young-Hun;Ha, Tae-Wook
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2009.06a
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    • pp.342-343
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    • 2009
  • Paper factories use a large amount of water and same amount of wastewater is generated. It is important to purity and recycle the wastewater because of water shortages and water pollution. The existing water treatment facilities like precipitation process need large-scale equipment and wide space to purity the wastewater of paper factory. High gradient magnetic separation (HGMS) system has the merits to purity rapidly because of large voids at filter and to occupy small space. In this paper, two types of superconducting magnets were used for HGMS systems. Cryo-cooled Bi-2223 superconducting magnet system with 70 mm room temperature bore and 200 mm of height was prepared. Cryo-cooled Nb-Ti superconducting magnet with 100 mm room temperature bore and 600 mm of height was used for magnetic separator. Magnetic filters were designed by the analysis of magnetic field distribution at superconducting magnets. The various magnetic seeding reactions were investigated to increase the reactivity of coagulation. The effects of magnetic separation of wastewater were investigated as variation of magnetic field strength and flow rate of wastewater.

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Superconducting magnetic separation of ground steel slag powder for recovery of resources

  • Kwon, H.W.;Kim, J.J.;Ha, D.W.;Choi, J.H.;Kim, Young-Hun
    • Progress in Superconductivity and Cryogenics
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    • v.19 no.1
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    • pp.22-25
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    • 2017
  • Steel slag has been considered as an industrial waste. A huge amount of slag is produced as a byproduct and the steel slag usually has been dumped in a landfill site. However the steel slag contains valuable resources such as iron, copper, manganese, and magnesium. Superconducting magnetic separation has been applied on recovery of the valuable resources from the steel slag and this process also has intended to reduce the waste to be dumped. Cryo-cooled Nb-Ti superconducting magnet with 100 mm bore and 600 mm of height was used as the magnetic separator. The separating efficiency was evaluated in the function of magnetic field. A steel slag was ground and analyzed for the composition. Iron containing minerals were successfully concentrated from less iron containing portion. The separation efficiency was highly dependent on the particle size giving higher separating efficiency with finer particle. The magnetic field also effects on the separation ratio. Current study showed that an appropriate grinding of slag and magnetic separation lead to the recovery of metal resources from steel slag waste rather than dumping all of the volume.