Heavy Media Permanent Magnetic Wet Drum Separator
7
TANK STYLES
Style I ‑ Concurrent
This design is most effective for producing an
extremely clean magnetic concentrate from relatively
coarse materials and is widely used in heavy media
recovery systems.
Feed is introduced at one end of the separator and
flows in the direction of the drum rotation. Magnetic
material is immediately picked up by the powerful
magnetic element. As the material is transported by
the revolving drum surface, the special magnetic
element agitates the material to free entrapped
non-magnetic particles. Non-magnetic material
is discharged at the bottom through the tailings
discharge opening. The magnetic particles are held
to the drum surface and pass through an opening
between the drum shell and the “squeeze-pan” where
excess water is forced out. The magnetic material is
then discharged on the discharge lip at the opposite
side of the tank from the feed.
The relatively long travel of magnetic material through
the water while being agitated by the special magnet
design gives a good washing action and produces a
clean magnetic concentrate.
It is very important in this type of separator that the
proper water level be maintained. Overflow volume
should be from 40% to 50% of total tailings flow. Feed
to the separator must remain constant to insure proper
water level. Either lowering of water level or allowing
too much underflow will result in excessive losses of
magnetic material or an insufficiently
cleaned concentrate.
Operation
FIGURE 5
Style Ii ‑ Counter‑Rotation
This separator is used where occasional surges in
feed must be handled, where magnetic material
losses are to be held to a minimum while an extremely
clean concentrate is not required, and when high
solids loading is encountered. Feed is introduced to
the drum which is rotating in a direction opposite to
that of the pulp flow. Magnetic material is picked up
by the drum and immediately discharged. Since the
tailings must flow under the magnetic arc of the drum
surface before discharging, losses are held
to a minimum.
It is important in this type of separator (a) for the solids
to be fine; (b) to provide oversize protection to screen
out solids larger than 1/4" (6 mm), and (c) that proper
water level be maintained with overflow volume 40%
to 50% of total tailings to prevent excessive losses.
Style Iii ‑ Self‑Leveling Counter‑Rotation
The Eriez Self-Leveling Wet Drum Magnetic
Separator represents the newest available technology.
This separator combines the best engineering
and operational features and provides excellent
performance with ease of operation, inspection,
and maintenance.
The Eriez Self-Leveling tank has no discharge
spigots to adjust. The tank level is controlled by
removable weir bars on the discharge side of the tank.
This arrangement allows the operator to maintain a
constant tank level at any flowrate. The high capacity
tank design accommodates surges and fluctuations
in the feed rate. After startup no adjustment or
monitoring are required.
FIGURE 6