effectively, the separators are designed with different magnet configurations and
pole pitches. Cobbers utilize the belt drum separator design in order to present ...
Dry low intensity magnetic separation Belt drum separators (also called dry cobbers) have been developed for separation of coarse ferromagnetic ores with feed particle sizes up to 300 mm to produce lump ore concentrates preconcentrates and to reject coarse gangue. Application
A typical flowsheet with application of rich ore, middlings and gangue separators is shown below.
Design
Cobbers utilize the belt drum separator design in order to present the material to the magnetic field as evenly distributed as possible.
© Metso Corporation, TS Dry low belt drum 1105-en
Cobbing of ores covers quite a large particle size range and in order to treat the ore most effectively, the separators are designed with different magnet configurations and pole pitches.
The rubber belt is supported by rubber idlers at the feed origin in order to absorb the material feed impact. The adjustable splitter under the magnetic drum is rubber covered for wear protection and is easily changed. The drive unit is mounted at the rear drum and is comprised of a speed reducer, V-belts, pulleys and motor. If required by process conditions or type of ore, a variable speed drive can be supplied to allow belt speed variation from 0.5 m/s up to 2.5 m/s as an option to the standard fixed speed arrangement.
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
Belt drum separators
Technical specification
Magnetic configuration
Permanent magnets of ceramic strontium-ferrite are the source of the magnetic field. Cobbing separators are available in the following two magnet configurations. The BSA-type has magnetic poles arranged in rows parallel to the drum shaft, thus forcing the magnetic material to rotate when passing over the drum causing the rejection of non-magnetic and weakly magnetic material. The BSA-type is suitable for separation of particles up to 200 mm in size.
The BSS-type (disc-type) has magnetic poles arranged in sectors with fixed polarity in the direction of the drum rotation; hence the particles do not rotate when passing over the drum. This design is used for coarser separations up to a maximum of 300 mm in particle size.
© Metso Corporation, TS Dry low belt drum 1105-en
The capacity and performance of the separators are dependant upon material factors such as mineralogical composition, particle size distribution, moisture content, degree of liberation, magnetic properties of ore, and ratio of magnetics to non-magnetics. When selecting the equipment, the following design criteria must be determined: • Fixed or alternating polarity • Pole pitch • Speed of belt
Performance and capacity
The BSA and BSS models are available with drum diameters of 1200 mm and drum lengths from 600 mm to 3000 mm in 600 mm multiples.
Performance and capacity
The capacity and performance of the separators The BSA and BSS models are available with drum diameters of 1200 mm and drum lengths from 600 mm to 3000 mm in 600 mm multiples.
The separation is optimized by balancing the centripetal and gravity forces against the magnetic attraction force by varying the speed of the belt. The graph below shows the influence of belt speed on selectivity when processing a typical crude ore (particle size 25 - 125 mm). The capacity figures shown in the following table may be used for calculation purposes, recognizing that the separator capacity will vary from case to case depending on already mentioned factors. It is recommended that careful laboratory and pilot plant studies are performed to establish optimal separation parameters for both selection of the correct type and size of separator.
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
Dimensions
Separator type
Recommended Particle size mm (maximum)
Max feed moisture % H2O
Available pole pitch mm
Capacities per meter of drum length t/h
BSA
150 (200)
3
165, 250
150 - 250
BSS
200 (300)
3
300
250 - 400
Model
Working length
Power* kW
H mm
L mm
W mm
Empty weight kg1)
Empty weight kg2)
BS 1206
600
5,5
2000
4360
1800
2100
2400
BS 1212
1200
7,5
2000
4360
2400
3800
4500
BS 1218
1800
7,5
2000
4360
3000
5600
7700
BS 1224
2400
7,5
2000
4360
3600
7450
8800
BS 1230
3000
11,0
2000
4360
4200
9300
9900
© Metso Corporation, TS Dry low belt drum 1105-en
*) At peripheral speed 2 m/sec. 1 ) Model BSA 2 ) Model BSS
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.
