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Magnetic separation
Magnetic separation
Overview
• Material is separated based on magnetic
susceptibility
• Highly magnetic material is removed using a
hand magnet
• Weakly magnetic materials are separated by a
Frantz magnetic separator
Magnetic separation
Hand Magnet
• Spread the sample in a single
layer on a piece of paper
• Cover the hand magnet in
weighing paper and pass over
the sample
• Set the magnet of a second
piece of weighing paper, hold
the first down and remove the
magnet
• Do not allow sample to
contact the magnet directly as
it is very difficult to remove.
Magnetic separation
Frantz set up
• The Frantz produces a strong magnetic field over a
ramp that holds magnetically susceptible material,
while non magnetic material falls to a second ramp
• Set the angle of the ramp using the black rotating
handle, typical angles are 10° - 25°
• Adjust the strength of the magnetic field using the
current knob *do not exceed 1.3 A*
• Set the sample constrainers in place at the end of
the ramps
Current Adjustment
Magnet current
Magnetic Separation
Frantz Magnetic separator
High magnetic
sample collection
Sample
Feed
Ramp angle
Adjustment
(typically 10°-25°)
Low magnetic
sample collection
Vibration control
Magnetic separation
Frantz sample separation
• Add sample to the feed shoe.
• The rate of sample introduction is controlled by
the angle of the feed outlet shoot and the
strength of feed vibration
• The speed at which material moved down the
ramp is controlled by the strength of the chute
vibration
• Set the vibrations such that material is able to
separate on the ramp and is not introduced so
fast as to cause clogs.
Magnetic Separation
Ramp
Vibration
Sample
Introduction
Magnetic separation
Franz clean up
• Remove separated material and blow off all
surfaces with compressed air.