gravity gold recovery – rougher concentrate flotation cil leaching zoom


gravity gold recovery – rougher concentrate flotation cil leaching
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Sulphide Gold Flotation Concentrate CIL Leaching

Gravity Gold – Rougher Concentrate Flotation CIL Leaching & Refining: This mineral processing plant is to recover gold from sulphide ore deposits. Provided here are all major equipment for a plant arranged to recover gravity gold, float a gold rich sulphide concentrate, liberate the sulphide hosted gold with a light regrind and dissolved its precious metals using the Carbon-in-Leach process. The CIL process with activated carbon is best suited for ores with no or some levels of preg-robbing carbonaceous material. The initial gravity circuit will extract any coarse GRG gold and silver. More difficult (refractory) ores may need deeper ultra-fine regrind prior to leaching as well and more elaborate processing, not included here.

This simple metallurgical concentrator includes single stage crushing, conveying, primary grinding, spiral classification, gravity concentration, slurry pumping, rougher and cleaner (optional) flotation banks, regrind mill, cyanide leaching tanks, loaded carbon stripping and regeneration as well as refining facility.

With this simple flowsheet, you will recover silver and/or gold into a bullion bar.

The gravity recovery components of this circuit can easily be removed in cases where laboratory testing has revealed there are no GRG precious metals in your ore.

Our standard packages are for process plants of:

  • 25 Tonnes/Day = 1 Tonne/Hour
  • 50 Tonnes/Day = 2 Tonne/Hour
  • 100 Tonnes/Day = 4 Tonne/Hour
  • 250 Tonnes/Day = 10 Tonne/Hour

This is a standard process plant which includes only the major components of the complete metallurgical flowsheet. A detailed engineering study is required to identify unforeseen omissions that may be required to design the optimum plant.

Additionally, we offer two separate packages for plant tailings thickening/filtration and water treatment. Contact us for details.



911MPE offers all the major components of this complete process plant designed using these key design parameters:

  • Coarse/Fine ore bin
  • Vibrating Grizzly feeder
  • Jaw crusher
  • Conveyor belts
  • Liquid reagent feeders
  • Ball Mill
  • Spiral classifiers
  • Slurry pumps
  • Conditioner tank
  • Flotation cells
  • Thickener
  • Regrind Ball Mill
  • Trash screen
  • CIL tanks
  • Vibratory screen
  • Desorpcion Unit
  • Electrowinning cell
  • Smelting Furnace
  • Centrifugal concentrator
  • Shaking table
  • Reagents used:
    SIPX, PAX, MIBC Frother, Flocculant, NaOH, NaCN Activated Carbon
  • Au grade =  15 g/t
  • Ag grade = 8 g/t
  • ROM = 100 mm
  • Jaw crusher F80 = 75 mm
  • Jaw crusher P80 = 12 mm
  • Steel balls = 2.5″
  • Ball Mill F80 = 12 mm
  • Ball Mill P80 = 90 µm
  • Spiral classifier overflow = 30%
  • Rougher pulp density = 33%
  • Rougher Retention time = 29 min
  • Thickener underflow 50%
  • Regrind Ball Mill steel balls = 1″
  • Regrind Ball Mill, F80 = 60 µm
  • Regrind Ball Mill, P80 = 30 µm
  • Regrind Spiral classifier overflow = 40%
  • CIL circuit pulp density = 40%
  • CIL Retention time = 48 hr
  • Gold production = 338 g/day
  • Silver production = 96 g/day

Process development testwork and detailed engineering are essential services 911Metallurgy Corp. offers separately. The equipment package described herein does not include any permitting, infrastructure, foundation, electrical, assembly, reagents/supplies or commissioning. These are all additional paid-for services we do offer if you need them.

grg gravity gold recovery rougher flotation and concentrate leaching by cil carbon-in-leach

Using gravity to supplement either flotation or cyanidation is a well established practice in the gold industry. It differs from other recovery circuits in that most of the gold recovered by gravity would be recovered in any case by the circuit downstream, be it flotation or cyanidation. The economic justification of gravity is therefore based on small margins (for example, a net smelter return of gravity gold of 99%, as opposed to 94% for flotation). It was easily demonstrated when either flotation or cyanidation were relatively inefficient processes, and labour costs low (as gravity can be labour intensive). Over the past fourty years, the introduction of better flotation machines (flash, column, high capacity), more effective collectors, and better control systems has increased flotation’s metallurgical performance, thereby decreasing the incentive for gravity recovery. Cyanidation technology has undergone similar changes, with the advent of activated carbon, oxygen and lead nitrate addition, and improved impeller design.

Today, gravity can remain an attractive option only inasmuch as it can be implemented with very low capital and operating costs. This has resulted in a relative shift away from gold gravity recovery (except for alluvial deposits), in the seventies and eighties. For example, as of the early nineties, gold gravity recovery has disappeared from the typical flow sheet. The advent of the iCON Concentrator, at the beginning of the eighties, foreshadowed a resurgence of gravity recovery, as gold’s grinding and classification behaviour makes it possible to achieve adequate gold recoveries with very simple, iCON based, gravity circuits.

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