Eriez DFA-10 Manual

Installation, Operation
and Maintenance
Instructions
ERIEZ MAGNETICS HEADQUARTERS: 2200 ASBURY ROAD, ERIE, PA 16506–1402 U.S.A.
WORLD AUTHORITY IN SEPARATION TECHNOLOGIES
MMPM-360B
DF
HIGH-SPEED
DRUM
MODELS DFA-10, DFA-25,
DFA-50, DF-RE

2
Introduction
This manual describes Eriez’ Permanent Magnetic DF High Speed
Separators. Dry Drum Separators provide superior magnetic protection
and higher levels of purity in food, grain, chemical and ore treatment
applications.
A careful reading of these Installation, Operation and Maintenance
Instructions will assure the most efficient and dependable performance
of this equipment.
Please include the model and serial number found on the nameplate
with any correspondence concerning your Drum Separator.
If there are any questions or comments about the manual, please call
the factory at 814-835-6000 for Dry Drum Separator assistance.
©2015 ERIEZ MAGNETICS ALL RIGHTS RESERVED
CAUTION ‑ STRONG MAGNET
This equipment includes one or more extremely powerful
magnetic circuits. The magnetic field may be much stronger
than the Earth’s background field at a distance several times
the largest dimension of the equipment.
• If you use a heart pacemaker or similar device you must
never approach the equipment because your device may
malfunction in the magnetic field, with consequences up
to and including death.
• To avoid serious pinch‑type injuries caused by objects
attracted to the magnet, keep all steel and iron objects well
away from the equipment. Do not allow hands, fingers, and
other body parts to be caught between the equipment and
nearby steel or iron objects.
• Keep credit cards, computer disks, and other magnetic
storage devices away from the equipment because
magnetically stored information may be corrupted by
the magnetic field.
• Keep electronic devices, such as computers or monitors,
away from the equipment because exposure to the magnetic
field may result in malfunction or permanent damage to such
devices.
Contact Eriez if you have a question regarding these precautions.
CAUTION
Safety labels must be affixed to this product. Should
the safety label(s) be damaged, dislodged or removed,
contact Eriez for replacement.

High-Speed Drum: Model DF
3
Table of Contents
ERIEZ PERMANENT MAGNETIC DRY DRUM SEPARATORS
GENERAL ............................................................................................................ 4
DESCRIPTION...................................................................................................... 4
INSTALLATION ..................................................................................................... 4
OPERATING INSTRUCTIONS ............................................................................. 5
SPLITTER SETTING............................................................................................. 6
MAGNET ROTATION ............................................................................................ 7
BEARING REPLACEMENT .................................................................................. 7
MAINTENANCE .................................................................................................... 8

4
Figure 1
General
Magnetic drums with high peripheral shell speeds
were developed to satisfy a need for a dry magnetic
separator capable of processing large volumes of
relatively fine ferromagnetic particles (-1") (-25mm).
Units previously available did not provide high
capacity or efficiency. The DF High Speed Drum is
a highly efficient unit for processing large volumes
of material and producing high grade magnetic
concentrates or removing very fine, highly
magnetic particles for purification.
Capacity, grade and recovery are directly related
to the peripheral speed of the drum. For high
recovery of magnetics or purification of non-
magnetics coarser than 1/8" (3mm), the Model
DFA-10 at a relatively slow peripheral shell speed is
used. The DFA-25 is used at moderate speeds for
cobbing or roughing concentration jobs. When a
very high grade, finished magnetic concentrate is
desired, the DFA-50 is used at a high shell speed.
Description of Equipment
Eriez DF High Speed Drum Separator consists of
a rotating drum shell within which is a permanent
magnetic element attached to a stationary support
and shaft. The magnetic element covers an
approximate 210° arc. Depending on the
application the drums are furnished with an A10,
A25, or A50 agitating magnetic element or with an
RE (rare earth) magnetic element. A 1-1/2" (38mm)
diameter hole and magnetic turnbuckle is drilled
through the shaft at the side opposite the motor
drive for positioning of the magnetic element. A
turnbuckle is currently used to make element
adjustments. (See Figure 1).
The shell is made from 1/8" (3mm) thick 304
stainless steel and typically has a 1/8" (3mm) thick
abrasion resistant rubber liner. Drum heads are
high strength aluminum alloy castings. Bearings
are completely sealed oversized antifriction type
for durability and trouble free operation.
A rectangular shaped dust-tight housing with
provision for dust collector connections is furnished
within a heavy steel angle superstructure. Housing
end panels have ¼" (6mm) thick abrasion resistant
rubber lining to reduce wear. An adjustable splitter
is furnished to separate the magnetic and
nonmagnetic fractions.
For periodic inspection of the housing interior
and the drum shell, a large hinged inspection
panel is provided.
A feeder is normally required for efficient operation
of the DF drum. An Eriez vibrating feeder is
recommended for most applications.
A TEFC motor and drive is furnished as standard
for all applications. The drive consists of a chain
and sprockets with an oil tight chain guard. A VFC
is recommended to vary the drum speed.
Installation Instructions
Installation is very straightforward. The system has
been assembled and has run at our factory to assure
quality. The DF drum separator comes completely
assembled. The vibratory feeder and control has
to be mounted to the drum housing per the outline
drawing for the particular order. Attach the feeder as
shown on the drawing and wire the control per the
included electrical schematic. All dust boots must be
attached and loose enough to prevent binding of the
feeder. Make sure the Vibratory Feeder has the
proper deflection. (See feeder IOM elsewhere in
this manual for deflection).
Dust extraction couplings are on the top cover of the
drum housing for use by the customer. If using Rare
Earth magnet material, avoid moisture weeping in
to the magnetic element. It would cause irreparable
harm. Avoid exposing the standard Rare Earth
magnet material to high temperature. The standard
circuits can only handle 150°F (65°C). Other circuits
are available to handle higher temperatures.
Inspection door
Mild steel housing
dust-tight construction
Inspection door
Magnet
adjustment arm
A

High-Speed Drum: Model DF
5
,
Operating Instructions
Models DFA‑10, DFA‑25, DFA‑50, DF‑RE
A predetermined drum speed is selected to begin
operation. Normal speed range in FPM:
DFA-10 300 – 1000 (90-300 mpm)
DFA-25 500 – 1500 (150-450 mpm)
DFA-50 500 – 1500 (150-450 mpm)
DF-RE 50 – 300 (15-90 mpm)
The material to be processed is introduced to the
drum by a vibratory feeder that evenly distributes the
material over the top vertical centerline of the drum.
As the material is fed onto the rotating drum, the
magnetics are immediately influenced by the
alternating polarity magnetic element which causes
the magnets to flip end-over-end (180°) as they pass
from pole to pole. This flipping action agitates free
the non-magnetics. Centrifugal force, which is directly
related to the speed of the drum, discharges the
non-magnetics as they are agitated free into the
nonmagnetic product hopper.
In some applications composite grains are present.
These are not completely magnetic nor completely
nonmagnetic. Their presence necessitates the use
of a special middling hopper that would require the
second product to be discharged from the drum. The
magnetic portion is discharged near the end of the
magnetic element into the magnetic product hopper.
Model DF‑RE
Normal speed range in FPM 50-300 (15-90mpm)
Feed is brought to and introduced to the DF-RE drum
in the same manner as for the DFA models. The
DF-RE is designed for maximum removal or recovery
of magnetic particles from a product. Normally for this
type of application, agitation is neither required nor
desirable. The magnetic particles are attracted to the
drum surface and held fast by the strong element
while centrifugal force ejects the nonmagnetic
particles. When the magnetic traveling with the shell
reach the end of the magnetics element, they are
released down the magnetic discharge chute.
Application & Capacity Data
The DF drum has been designed for high capacity
dry separation of fine particles. The basic criteria of
application include:
1. Particles to be separated or concentrated must
be ferromagnetic (strongly magnetic).
2. Feed should be free flowing.
3. Material to be processed should normally be
-1" (-25mm) plus 20 microns. Normal particle
size ranges:
DFA-10 -1½"
DFA-25 -¼"
DFA-50 -20 mesh
DF-RE -¼”
The capacity of the DF drum depends to a great
extent on the particle size and drum speed since
the material is treated at preferably a single particle
depth on the shell. Consequently, particle size,
peripheral speed and magnetic susceptibility affect
the capacity. Capacity per foot (300mm) of magnetic
width varies from approximately 3 TPH to 25 TPH
(2.7 to 23 MTPH).
Grade and recovery are directly related to the
peripheral speed of the drum. For high recovery
of magnetics or purification, the Model DFA-10 or
DF-RE at a relatively slow peripheral shell speed is
used. When a very high grade magnetic concentrate
is desired the DFA-50 is used at a higher shell speed.
The DFA-25 is used at moderate speeds for
"cobbing" or "roughing" operations. (Selectivity
increase when the products to be separated are
within four Tyler mesh sizes.)
Some operations require the use of multiple stage
units. For example, in iron ore beneficiation the initial
stage would provide a high recovery, low grade
concentrate with minimum loss of magnetics in the
tailings. The magnetic concentrate from the first drum
is re-cleaned on the second stage to produce a high
grade concentrate and a middling product. The
middling can be sent back for further grinding or
can be re-circulated without grinding.
Normally it will be necessary to make some
adjustments in shell speed, feed rate and splitter
location to attain optimum conditions.
DFA‑10 -1+¼" (-25mm+6mm)
DFA‑25 -¼" (-6mm)
DFA‑50 -100 mesh (-149 micron)
DF‑RE -1+¼" (-25mm+6mm)
DF‑RE -¼" (-6mm)
DF‑RE -100 mesh (-149 micron)
DFA‑10 400-800 (122-244 mpm)
DFA‑25 700-1,200 (213-366 mpm)
DFA‑50 1,000-1,500 (305-457 mpm)
DF‑RE 50-300 (15-90 mpm)

6
Splitter Setting
The splitter segregates the magnetic from the
nonmagnetic product. Its best position balances the
maximum removal of magnetic products with minimal
misplacement of non-magnetics for a given feed
rate and drum rotation speed. Both increased drum
speed and increased feed rate will move the main
non-magnetic flow away from the drum. Drum speed
has a much greater effect on splitter position than
feed rate does.
The splitter may be observed from the side port in the
housing of the drum. Typically, the splitter is adjusted
to be close to the main non-magnetic flow, allowing all
deflected particles to report to the magnetic fraction.
This could include non-magnetic particles that have
magnetic particles embedded or locked to them.
For some materials there may be a clear visible color
difference between the flows. For other materials the
difference may only be seen in the assays.
When concentrating magnetic ores or materials,
the splitter will be located along the centerline of the
drum shaft or a few inches behind. The drum speed
is typically higher which forces the discharge of the
magnetic product near the back of the drum housing.
The splitter tip may be adjusted up or down when
there is no feed. It would be accessed from the lower
front panel of the drum housing. Normally, this would
not be adjusted. It would be lowered to accommodate
large chunks of magnetic or to clear the drum if the
splitter is canted back into the drum to limit misplaced
non-magnetic material. It would be adjusted up or
down to obtain the best placement for the chosen
magnet rotation discussed below. (See Figures 2-4).
Figure 2 ‑ Multiple Splitters
Figure 3 ‑ One Splitter/Clean Non‑Mag
Figure 4 ‑ One Splitter
Clean Magnetic Concentrate
Mag
discharge
Mag
discharge
Non-mag
discharge
Middling
Inspection
door
Magnetic
discharge Non-magnetic
discharge
Magnetic
discharge
Non-magnetic
discharge
Inspection
door

High-Speed Drum: Model DF
7
Magnet Rotation
On the drum shaft there is either an arrow indicating
the center of the magnet arc or a colored section
indicating the magnet arc. The normal position for the
magnet element has the arc center slightly elevated
in the front half of the drum. The drums are usually
shipped with the magnet arc hanging down and
must be repositioned for startup.
The magnetic material will stand up in the center
of a magnetic pole where the field is perpendicular
to the material flow. At the pole edge the magnetic
material will lay down and point towards the next pole
or away from the magnet arc almost tangent to the
drum surface. Sometimes this pole edge can be seen
as a line of magnetics before a drum cleat wipes the
magnetics away.
The splitter tip will separate magnetics better if it is
located between the pole edges, rather than in the
center of a pole. If the edge can be seen, the splitter
tip can be adjusted accordingly. However, sometimes
the splitter cannot be adjusted to the optimum length.
In this case, the magnet rotation can be adjusted by
loosening the set screws on the flange mounted on
the non-drive side of the drum. The magnet adjusting
arm turnbuckle is used to adjust the magnet to fit the
splitter position and the set screws re-tightened.
Bearing Replacement
The standard units have four bolt flange bearings
which are sealed and greaseable. Remove the drum
from the housing. Support the drum shaft on blocks to
take the weight of the bearings. When removing the
bearings you should first clean the shaft thoroughly
with solvent then attempt to remove the four bearing
mounting bolts and bearings set screws.
Pry between the bearing and the drum head to slide
the bearing off the end of the shaft. If the bearing is
not moving (usually due to the head flexing inward),
you will have to remove all the fasteners holding the
drum head to the shell.
You would then use the tapped holes in the head with
threaded rod and porta power pushing against the
end of the shaft. Make sure to match mark the heads
and shell before going this route. (See Figure 5)
To Install a New Bearing
1. Inspect the shaft. Remove burrs, verify diameter
and clean mounting surface.
2. Place bearing on the shaft. Apply light film of oil.
Do not hammer onto shaft.
3. Bolt housing to mounting surface. Make sure the
magnetic element is centered between the heads.
Rotate shaft to make sure it turns smoothly.
4. Bolt up the bearing to the mounting surface and
torque bolts to 75 ft.-lbs.
5. With two setscrews, torque set screw ‘A’ to ½
recommended torque (73-95ft.-lbs.), torque set
screw ‘B’ to full torque. Torque setscrew ‘A’
to full torque.
Figure 5
Flange bearing bolts
Bearing
set screws
use blue
loctite
Fasteners holding
head to shell
Flange bearing
Spot shaft @
assembly four
locations
Drum head
Flange bearing
max T.I.R.
sprocket .020"
Sprocket
Torque to
75 ft lbs
use blue
loctite

8
©2015 Eriez Magnetics All Rights Reserved
World Authority in Separation Technologies
Headquarters: 2200 Asbury Road, Erie, PA 16506-1402 U.S.A.
Telephone: [phone] • 800-345-4946 • Fax: [phone] • International Fax: [phone]
Web Site: http://www.eriez.com e-mail: [email protected]
Manufacturing Facilities: AUSTRALIA • BRAZIL • CANADA • CHINA • INDIA • JAPAN • MEXICO • SOUTH AFRICA • UNITED KINGDOM • UNITED STATES
215-10-AHA-PC ERIEZ MANUFACTURING CO ©2015 PRINTED IN USA
Eriez and Eriez Magnetics are registered trademarks of Eriez Manufacturing Co, Erie, PA
Maintenance
The Eriez DF High Speed Drum is a heavy-duty unit
designed to be as maintenance free as possible.
Periodic inspection of the unit is necessary to locate
any areas of unusual wear. In certain abrasive
applications, extreme wear due to the high shell
speeds can take place and is not unusual.
Abrasion‑Resistant Rubber Liners
Rotate the drum slowly to locate any worn spots
in the rubber liner and also inspect the housing end
panels to determine if excessive wear has taken
place. If worn spots are noticed, replace the liner.
Bearings
Readily accessible grease fittings are provided
on both hubs for bearing lubrication. Lubricate
approximately every two weeks with Lubriplate #70
grease, or equivalent, through these grease fittings.
The drum cannot be operated while performing
lubrication.