3
• Very reliable, sound mechanical design
• Minimal spares inventory -interchangeable with
MagSeps
• Significant redundancy capability -plant keeps
operating.
Axial Pole Magnets
Both types of drums share similar design concepts in that
they use axially arranged pole magnets to help attract the
magnetite but allow ingrained gangue or water to be liber-
ated from the drum surface.
The magnetite captured by the first magnetic pole
does not readily move with the rotation of the drum as it
is attracted to the points with the highest magnetic field
intensity located over forced to migrate around the cir-
cumference of the drum. As it rotates around the drum,
the magnetic material is subjected to repeatable magnetic
fields, enhancing separation efficiency. In a 1220mm diam-
eter MIMS drum, there are multiple pole changes that the
material is subjected to as shown in Figure 4. The weakly
magnetic, the gangue, or water are free to act under normal
Newtonian laws of physics.
RESULTS
Dry Magnetic Separation Circuit
Recent test work in our Pulheim STEINERT GmbH facil-
ity tested magnetite material from a client based in Brazil
and results shown in Figure 5. The feed was from an HPGR
circuit in a closed circuit with a screen at a nominal 3mm
cut point on the screen:
This circuit was looking at a Rougher Cleaner
configuration.
In the rougher stage, 11.7% of the mass was sorted
as “Nonmags,” whereby the Fe losses were only 4.4%. A
further 28.9% of the mass was separated in a downstream
cleaner stage. The losses here totalled 19.3%.
The quantity of the separated mass and the amount of
iron losses can be influenced by selecting the field strength.
Figure 3. Axial pole magnetic drum
Figure 4. Magnetic field
Figure 5.
• Very reliable, sound mechanical design
• Minimal spares inventory -interchangeable with
MagSeps
• Significant redundancy capability -plant keeps
operating.
Axial Pole Magnets
Both types of drums share similar design concepts in that
they use axially arranged pole magnets to help attract the
magnetite but allow ingrained gangue or water to be liber-
ated from the drum surface.
The magnetite captured by the first magnetic pole
does not readily move with the rotation of the drum as it
is attracted to the points with the highest magnetic field
intensity located over forced to migrate around the cir-
cumference of the drum. As it rotates around the drum,
the magnetic material is subjected to repeatable magnetic
fields, enhancing separation efficiency. In a 1220mm diam-
eter MIMS drum, there are multiple pole changes that the
material is subjected to as shown in Figure 4. The weakly
magnetic, the gangue, or water are free to act under normal
Newtonian laws of physics.
RESULTS
Dry Magnetic Separation Circuit
Recent test work in our Pulheim STEINERT GmbH facil-
ity tested magnetite material from a client based in Brazil
and results shown in Figure 5. The feed was from an HPGR
circuit in a closed circuit with a screen at a nominal 3mm
cut point on the screen:
This circuit was looking at a Rougher Cleaner
configuration.
In the rougher stage, 11.7% of the mass was sorted
as “Nonmags,” whereby the Fe losses were only 4.4%. A
further 28.9% of the mass was separated in a downstream
cleaner stage. The losses here totalled 19.3%.
The quantity of the separated mass and the amount of
iron losses can be influenced by selecting the field strength.
Figure 3. Axial pole magnetic drum
Figure 4. Magnetic field
Figure 5.