Superconducting magnetic separation

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Superconducting magnetic separation

• antares

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Introduction
problem

• Industrial development
• Improvement of living standard

Disposal problem such as industrial waste
solution
effluent purification recovery of resources
Advancement of magnetic separation
using superconducting magnet
Separate Microscopic particles
weak magnetic particle
Magnetic separation will greatly contribute to
preserving the global environment
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Meaning to use superconducting magnetic
separation
Strong magnetic field can be generated with
stability
Miniaturization speed-up energy saving
Separate Microscopic particles weakly
magnetic particles diamagnetic particles
1986 , Eriez Magnetic company
Weight 42 Volume 34 Dissipation power 5
excitation 1min. or less
Superconducting magnet
Old magnet
Cumulative energy 3.53 MJ Center magnetic
density 2 T
2 T
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What is magnetic separation?
carrier fluid
particle
Water , Air , Oil , Organic solvent
filtration
useful or harmful material
The magnetic pole is made for them to adsorb the
particle.
Magnetic force is caused for the particle.
preprocessing tank
Post-processing tank
magnet
flow monitor
Magnetic filter
Fig.1 Magnetic separation system
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Principle of magnetic separation
Vp dispersoid volume µ0space permeability M
magnetization H magnetic field ?p volume
magnetic susceptibility (magnetic particle) ?f
volume magnetic susceptibility (carrier field)
Magnetic force
to enlarge Fm
(2) The gradient of the magnetic field is
enlarged.
(1) The magnetization is enlarged adding
magnetism.

• ?p ? large

• High gradient magnetic separation

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Kind of super conducting magnetic separation
Fig.2 (a) high gradient magnetic separation and
(b) open gradient magnetic separation
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The present condition
In Japan
promoted by the public fund

• Removal of arsenic from geothermal water
• Leachate treatment from reclaimed ground
• Removal of dye from paper mill drain
• Environmental hormone

In USA

• Restoration of environment in the vicinity of
  nuclear power facilities
• Radioactive substance from radioactive effluent
  and removal of fission product
• Removal of heavy metal ion (plutonium ,
  americium) using biomagnet

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Advantage of magnetic separation
Comparison with mechanical filter

• Select Only magnetic particle
• magnetic insemination is done to a possible
  magnetic separation
• The filtration velocity is fast
• Wash of the filter can be easily done
• When the magnetic field is cut, the trap power
  is lost.

electric control is easy
It is suitable for the industrial purpose.
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Problem
Using superconducting
high
System cost
Super conducting coil (Stop permanent
current)
Take time fever
In HGMS
Mechanical strength
weak
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Application of HTS magnet system to the magnetic
separation techniques for water purification

• T.Oka , H.kanayama , S.Fukui , J.Ogawa , T.Sato
  , M.Ooizumi, T.Terasawa , Y.Ito , R.Yabuno

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Abstract
viewpoint of environmental problems
Separate toxic heavy metallic ions from the waste
water
The wastewater exhausted by the university
laboratory is processed.
Using Magnetic separation technique
Three magnets are compared
Method

• Electromagnet
• HTS bulk magnet
• Cryo-cooled superconducting solenoid magnet

• OGMS
• HGMS

The performances of separation ratios of Fe.
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Experiment
Fig.1 A schematic view of magnetic separation
experiment for waste water
Table1 A list of various magnetic field generators
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Magnetic field distribution
Fig.2 Schematic illustrations of magnetic field
(a) superconducting solenoid, (b) HTS bulk
magnet and (c) electromagnet
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Result
increase flowing rate up to 3 l/min
(a)
(b)
Fig.3 Separation ratio vs. flow ratio of waste
water (a) HGMS and (b) OGMS
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Conclusion

• The ferrite precipitates were removed over 85
  for HGMS and 9 for OGMS.
• The performances of HTS bulk magnet and SC
  solenoid magnet approximately equal to each other.

The steep magnetic gradient of bulk magnet system
Advantage of other methods
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Reference
(1)???? ???????????? (2006) (2)????,????,???????
????????? (1998) (3)Takashi Ohara , Hiroaki
Kumakura , Hitoshi Wada ?Magnetic separation
using superconducting magnets? (2000) (4)T.Oka,
H.Kanayama , S.Fukui , J.Ogawa , T.Sato
?Application of HTS bulk magnet system to the
magnetic techniques for water purification?,
(2008)