C900 Pilot Plant MGS

A proven machine for pilot scale gravity separation or the production processing of small waste streams. The C900 is used worldwide in mineral processing laboratories and has an unsurpassed ability to recover fine and ultra-fine materials.

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Originally developed as a laboratory machine, the C900 MGS is a scaled down version of the proven production machine. This mid size machine is ideal for larger scale pilot plant testing or for small scale production operations. It is designed to stand the rigours of a 24/7 mining operation, yet has full adjustability for laboratory testing if needed.

The Multi Gravity Separator (MGS) operates on a similar principle to a shaking table to separate and upgrade very fine materials. MGS' subtle centrifugal force simulates enhanced gravity, pinning heavier materials to the wall of the drum to be dragged forward by scraper blades, while lighter tailings are agitated by the shaking motion and washed away. The MGS will function satisfactorily with materials up to 500 microns but, it works exceptionally well where there is a narrow size band of material below 100 microns.

The benefits of using an MGS system in a gravity circuit are typically:

Delivers very high grade and recovery from fine and ultrafine material
Sustainable, chemical free processing
Suitable for concentrating many valuable metal bearing ores
Self regulating and able to cope with significant changes in material grade without losses
Ability to cope with changes in feed pulp density by adjusting wash water levels.

Flexible solution

Can be used to produce saleable grade concentrate from low grade tailings in one step, or
Can be used in a two stage process either as a rougher or finisher to optimize capacity and recovery

The MGS mechanical system is ultra simple allowing easy access for occasional maintenance. Variable speed drum rotation and fixed speed shake motion are driven by separate motors.

The MGS' scraper blade system drags heavy fine materials to the front of the drum, while tailings are washed to the back of the machine. Alternative scraper designs are available to optimise the scraping action.

C900 Pilot MGS technical specifications

Capacity - 250 Kg/hr (dry basis - material dependent)

Feed Particle size range - 500-1 micron

Feed Pulp Density - 10% to 50% solids w/w

Packed dimensions - 1620 * 710 * 1090 mm

Gross Packed weight - 520 Kg

Net weight - 360 Kg

Electrical standard - IP66 with centrally mounted control panel

Power requirements - Single phase 110/240V 50/60Hz - (3 phase optional)

Drum Drive Electric Motor - 1.1 kW variable speed

Shake Drive Electric Motor - 0.55 kW variable speed

Total Power - 1.7 kW installed (typical consumption 0.8kW

Drive System - Belt

Rotational Speed - 100-280 rpm infinitely variable

Shake Frequency - 4.0, 4.8 and 5.7 Hz infinitely variable

Shake Amplitude - 15 mm std. (10 or 20 mm optional)

Tilt Angle - 7.5 degrees std. (0-9 degrees optional)

Wash Water - 0-10 litres/min per drum (free of solids)

Construction materials

Frames - Powder coated steel

Drum - Aluminium

Drum Lining - Abrasion resistant polyurethane

How the Gravity Mining - Multi Gravity Separator works

Drum Rotation - Slurry is fed to the mid point of the drum as it rotates. The subtle centrifugal force capitalizes on small differences in Specific Gravity keeping heavier materials in place to be dragged forward by the scraper blades. Lighter materials flow with the wash water to the rear of the drum. Rotation speed is variable (100-180 RPM) allowing flows to balance for optimum recovery and grade.

Scraper blades are rotated at a differential speed to the drum which drags heavier materials forward to the front of the machine. Blade design is critical for maximum output, allowing lighter material to flow, while heavier material is caught and dragged forward.

The Drum and Scraper system move together in an adjustable Axial simple harmonic motion. This fluidizes the material allowing directional movement.

MGS’ Tapered Drum creates higher centrifugal forces towards the tailings end of the machine, this has the effect of recycling any heavy material that finds its way to this end of the machine.

Tilt Angle of the drum is adjustable and creates a natural gravity bias for the material and wash water.

Wash Water combined with natural gravity and the drum tilt angle creates a flow carrying less dense tailings to the back of the drum. Adjusting the water flow can impact the concentrate grade.