Micro Multi Gravity Separator

Designed specifically as an affordable and portable solution for the laboratory testing of gravity separation using smaller weights of mineral samples.

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The Micro MGS is a miniaturized version of a proven production method. Like the larger members of the Gravity Mining Family, the Micro Multi Gravity Separator (Micro 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, while lighter tailings are agitated by the shaking motion and washed away.

The Micro MGS was designed specifically to allow rapid test results to be produced from very limited sized samples. Scoping tests can usually be carried out with as little as 10 kg of sample with more detailed grade and recovery optimization work from c.75 kg of sample. Alternatively, the small size and affordable cost means that it can be sent to the mine site, avoiding the need for the shipment of high value precious metal ores.

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.

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

Micro MGS' miniaturized scraper blade system performs well giving results very comparable to the larger MGS machines.

Note: Prototype machine shown without final guard design.

Micro MGS' mechanical system is ultra simple allowing easy access for occasional maintenance.

Micro MGS technical specifications

Capacity - 10 - 25 Kg/hr (dry basis - material dependent)

Feed Particle size range - 500-1 micron

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

Packed dimensions - 700 * 1100 * 600 mm

Gross Packed weight - 50 Kg

Net weight - 35 Kg

Electrical standard - IP66

Power requirements

Drum Drive Electric Motor - 0.25 kw variable speed

Shake Drive Electric Motor - 0.18 kw variable speed

Drive System - Belt

Rotational Speed - 100 - 280 rpm infinitely variable

Shake Frequency - 5.8 Hz std. (4.0 and 4.8 Hz optional)

Shake Amplitude - 12.5 mm std. (10, 15 or 20 mm optional)

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

Wash Water - 0-10 litres/min

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.