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.
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.
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.
New style machine with lightweight Aluminum drums, shown without launder covers.
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.
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)
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.