2
Dry Circuit Solution
The development and optimisation of high-speed dry
drums have enabled higher throughputs without creat-
ing eddy currents, which the traditional steel drums have
suffered in the past, leading to overheating units and con-
sequently reducing magnetic intensity. Unit widths now
available are up to 4m, almost double the length of tradi-
tional steel drum configurations.
This new innovative technology utilises a non-metal
steel drum that can operate between 1 to 9m/s or up to
140RPM speed with a 1220mm diameter drum.
The ideal place for these units is to separate the mag-
netics from the non-magnetics before the grinding cir-
cuit. This location has nominally beneficiated the ore and
rejected 30 to 40% of the waste host rock, which is barren
of any magnetic material.
The consequence of rejecting the waste rock is demon-
strated in numerous advantageous ways:
• The reduction of mill sizes that are needed to grind
the material between typical F80 of 3mm to 8mm to
P80=30 to 45µm.
• The reduction of closed circuit loads in the crushing
circuit leads to:
– Smaller or fewer crushers.
– Less Vibrating Screens.
– Potentially fewer conveyors or smaller-width
conveyors.
These items alone are significant capital-saving cost reduc-
tions to a major Greenfield project or can significantly
improve brownfield operations by helping debottleneck
crushing or milling circuits.
Wet Circuit Solutions
Similar to the advancement of dry circuit solutions in
magnet developments, a similar optimisation process has
occurred in the concentrate circuit:
The typical wet process circuit following the grinding
circuit has stayed unchanged. It incorporates Wet Drum
Separators to recover the magnetically susceptible minerals
pumped to thickeners. From the thickeners, the thickened
concentrated is pumped to the filters and then onto stock-
piles as shown in Figure 1.
The new concept process flow sheet takes concentrate
directly from the final wet drum separator circuit and is
pumped to STEINERT Dewatering drums. These pat-
ented drums are fitted with high-strength rare earth mag-
nets that efficiently and effectively recover up to 99% of the
concentrate.
These new concept flow sheets now become like shown
in Figure 2:
The advantages of undertaking and implementing this
technology are as follows:
• Low Capital outlay
• Small and flexible footprint
• Compact support structure
• Operating cost comparable with conventional
MagSeps
• Reasonable lead times to manufacture and can be
with progressive deliveries
• Simple commissioning
Figure 1.
Figure 2.
Dry Circuit Solution
The development and optimisation of high-speed dry
drums have enabled higher throughputs without creat-
ing eddy currents, which the traditional steel drums have
suffered in the past, leading to overheating units and con-
sequently reducing magnetic intensity. Unit widths now
available are up to 4m, almost double the length of tradi-
tional steel drum configurations.
This new innovative technology utilises a non-metal
steel drum that can operate between 1 to 9m/s or up to
140RPM speed with a 1220mm diameter drum.
The ideal place for these units is to separate the mag-
netics from the non-magnetics before the grinding cir-
cuit. This location has nominally beneficiated the ore and
rejected 30 to 40% of the waste host rock, which is barren
of any magnetic material.
The consequence of rejecting the waste rock is demon-
strated in numerous advantageous ways:
• The reduction of mill sizes that are needed to grind
the material between typical F80 of 3mm to 8mm to
P80=30 to 45µm.
• The reduction of closed circuit loads in the crushing
circuit leads to:
– Smaller or fewer crushers.
– Less Vibrating Screens.
– Potentially fewer conveyors or smaller-width
conveyors.
These items alone are significant capital-saving cost reduc-
tions to a major Greenfield project or can significantly
improve brownfield operations by helping debottleneck
crushing or milling circuits.
Wet Circuit Solutions
Similar to the advancement of dry circuit solutions in
magnet developments, a similar optimisation process has
occurred in the concentrate circuit:
The typical wet process circuit following the grinding
circuit has stayed unchanged. It incorporates Wet Drum
Separators to recover the magnetically susceptible minerals
pumped to thickeners. From the thickeners, the thickened
concentrated is pumped to the filters and then onto stock-
piles as shown in Figure 1.
The new concept process flow sheet takes concentrate
directly from the final wet drum separator circuit and is
pumped to STEINERT Dewatering drums. These pat-
ented drums are fitted with high-strength rare earth mag-
nets that efficiently and effectively recover up to 99% of the
concentrate.
These new concept flow sheets now become like shown
in Figure 2:
The advantages of undertaking and implementing this
technology are as follows:
• Low Capital outlay
• Small and flexible footprint
• Compact support structure
• Operating cost comparable with conventional
MagSeps
• Reasonable lead times to manufacture and can be
with progressive deliveries
• Simple commissioning
Figure 1.
Figure 2.