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Mining & Mineral Processing

Wet Drum Separator [LIMS] for Iron Ore Concentration

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Low intensity [Ceramic Ferrite], Permanent
Application Summary
Wet beneficiation and upgrading of ferromagnetic iron ores
Materials / Commodities

The MAGQUIP SCC Wet drum separator is a multi stage, low intensity wet drum separator with a “steffensen” semi counter-current tank style and axial “interpole” type magnet arrangement which is typically used in the “finishing” stage for the concentration and upgrading of magnetite ores to produce a 65% Fe concentrate for iron making.

The MAGQUIP semi counter current type wet drum separator can be of two or more typically three stage configurations as typically found in the final cleaning “finishing” stage of iron ore concentration post “cobbing” [primary crushing] and “roughing” [secondary milling] stages and will product the final high grade magnetic concentrate.

This 1200 mm diameter tertiary stage separator employs an axial “interpole” ferrite permanent magnet assembly producing 950 or 750 gauss at 50 mm from the drum surface, this requirement is the industry standard for magnetite ore concentrating wet magnetic separators.

The drum rotates in Semi counter current [SCC] tank style tank which provides a high grade concentrate with minimal losses of fine magnetite.

Standard drum diameters are 1200 mm with magnet widths of up to 3600 mm

In a semi counter current wet drum separator, the feed slurry concentrate from previous primary [cobbing] or secondary [roughing] magnetic separation stages are fed to the separator through the 1st stage drum feed box. The feed is the presented to the 1st separator directly underneath the drum, the magnetics are then collected on the rotating drum shell and carried over to the feed box in the direction of drum rotation and to the next, second or third stage drum for reprocessing, any non-magnetic particles are force to travel in the opposite direction to the drum rotation. Pulp level in this tank configuration is automatically maintained. This SCC tank is also known as the ‘Steffensen’ type – after the inventor P.L. Steffensen [US patent 2160628

Between each magnet drum inter-stage water dilution manifolds and spray nozzles re-pulp the densified concentrate from previous stages to required solids percentage for re-processing. Fe grade may be made at the first stage, but further treatment may be required to reduce the amount of impurities such a phosphorus or sulphur. Final recovery percentage at this stage of separation yields recovery of 99.5% and final concentrate from the separator is generated into a concentrate collection chute.

The fixed axial inter-pole magnet element is chosen for this application because it has a moderate magnetic field gradient with a smooth gauss profile on the drum surface, this is essential for transport of magnetic particles from feed to discharge point. Typically, a 120° magnet angle is commonly used with 5 main poles for 950 gauss and 6 main poles for 750 gauss.

Product final concentrate in magnetite iron ore concentrator plants and treat material particle size down to 38 microns

Upgrade tailings copper and phosphate tailings plants

Upgrade vanadium

MAGQUIP’s proven SCC tank design is proven in many major iron ore concentrating plants (Chile, Iran)

The SCC tank and magnet in combination ensure minimal magnetic particle losses while obtaining high recovery rates and producing available grade.

Uses MAGQUIP optimised axial interpole magnet element circuit

Robust, heavy duty construction for operational longevity and minimal maintenance

Available in wide range of magnet widths 600 mm up to 3600 mm

Maintenance friendly drum components, sealed for life drive end bearing, non-drive bearing can be changed “in-situ

Advanced drum component sealing and ingress protection arrangement

Modular magnet element using support column instead of solid shaft, detachable stub shafts on either column end

Direct Drive Shaft mount helical bevel geared motor drive arrangement on detachable drive shaft, low maintenance and easily detachable

Non-drive side drum bearings required re-lubrication; non-drive bearing can be changed “in-situ”. The drive side is “lubricated for life”

Test, pilot and laboratory versions available

Axial Interpole magnet circuit in drum – Drum Shell carried on end flanges fitted with sealed, self-aligning bearings. The shell is made from non-magnetic stainless steel, typically 6 mm thick. The shell can be covered with rubber or similar lining, typically 6 mm thick. The drum end flanges are machined from non-magnetic stainless-steel plate.

The feed box and tank are fabricated from non-magnetic stainless steel, typically 6 mm thick. The concentrate chute and feed box can be lined with polyurea spray on lining or rubber.

The support frame is fabricated mild steel sections and painted with a 2 coat epoxy paint system.

Helical bevel shaft mounted geared motor drives the drum directly coupled to the end flange via a stub shaft.

Interstage dilutions water manifold and spray nozzles

Drum Scraper blade assemblyand spray water nozzles for cleaning final concentrate from drum shell