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
