LIMS dry drum0 pages

Dry low intensity magnetic separation
Metso dry drum separators have been
developed mainly for dry separation of
ferromagnetic ores with particle sizes
finer than 20 mm. In addition to this
conventional application, the dry drum
separator has found a wide range of
other applications such as:
• tIron and steel slag treatment
• tReduced pyrite ash separation
• tCalcined ilmenite production
• tMetal powder production
• tSupergrade magnetic concentrate production
• tRemoval of ferromagnetic particles prior to
highintesity magnetic separation
• tControl of iron contamination in glass sand
production.
Efficient separation can be obtained with particle
sizes in the range of 0.01 to 25 mm. By utilizing
separators with different drum speeds, it is often
possible to obtain a high grade concentrate with
middlings and tailings as separate products.
Often, dry magnetic separation can be more
flexible than conventional wet magnetic separation and can provide large savings in grinding
costs by recovering the valuable minerals at an
early process stage.

Design

The dry drum separator consists of a stationary magnetic yoke with a number of permanent
magnets placed insidea rotating drum of nonmagnetic material.

© Metso Corporation, TS Dry low drum 1105-en

The magnets have alternating polarity and are
normally of strontium-ferrite. The revolving drum
is made in two versions:
1) for low speed, stainless steel with a replaceable wear cover of rubber, polyurethane or stainless steel and,
2) for high speed, reinforced plastic with rubber
or polyurethane wear protection.
The magnetic drum assembly is contained in a
dust proof housing with an opening at the bot-

tom for discharge of both magnetic and nonmagnetic products. These products are separated by means of a splitter placed under the
drum inside of the housing. The whole unit can
be dust vented by connecting the plant exhaust
system to the outlet provided on the housing.
Parts of the housing exposed to wear are normally protected by replaceable rubber or steel
wear plates. Inspection of the drum and housing
is made through inspection hatches. The housing is easily dismantled for erection and maintenance.
The feed arrangement is dependant upon local
conditions. For run-of-mine fines, a belt feeder is
recommended. For other materials, a vibrating
feeder, (or in the case of dusty material, completely covered drum feeders) can be used. The
housing is equipped with a standard replaceable
feed chute.
To meet the various requirements the separators
are manufactured with two different drum diameters; i.e. 916 and 1200 mm and drum lengths
from 300 mm to 3000 mm in. The separator
design allows for an easy combination of drums
into double- or triple- drum units.

For more information, contact your local Metso representative. www.metso.com
Metso Minerals (Sweden) AB, SE-733 25 SALA. Tel: +46 224 570 00.
Specifications in this document are subject to change without notice.
Product names in this publication are all trademarks of Metso Corporation.

Technical specification

Drum separators