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C902 Multi Gravity Separator

This proven machine has an unsurpassed ability to recover fine and ultra-fine materials. The MGS' continuous process is low energy and its robust design requires minimal maintenance.

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Originally developed for the Cornish Tin industry, the C902 MGS is a proven production machine with over 80 manufactured machines, many of which are still in service. 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 can be used as a primary separator of fine materials, scavenging tailings and middlings from spirals or shaking tables. Alternatively it can be used in two stages to maximise recovery and grade. 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' 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.

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New style machine with simplified chassis design and more robust safety guarding. Machine shown with lockable stainless steel control panel and Allen Bradley PF525 -Ethernet/IP addressable inverters for remote operation and control

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

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C902 MGS technical specifications

Capacity - 4-5 tonnes/hr (dry basis-material dependent)

Feed Particle size range - 500-1 micron

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

Unpacked dimensions - 4242 * 1540 * 1980 mm

Gross Packed weight - 3,050 Kg

Net weight - 2,500 Kg

Electrical standard - IP66 with centrally mounted control panel

Power requirements - 3 phase 415V 50Hz - other options available

Drum Drive Electric Motor - 2 * 2.2 kw variable speed

Shake Drive Electric Motor - 2.2 kw variable speed

Total Power - 6.6 kW installed (typical consumption 3.3kW

Drive System - Belt

Rotational Speed - 100-185 rpm infinitely variable

Shake Frequency - 2-6 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 - 0-40 litres/min per drum (free of solids)

Construction materials 

Frames - Galvanized 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.

GM logo design revision 100 by 100 mm 30
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