Gravity Gold & Flotation Plant

Gravity Gold & Flotation Plant

This complete process plant is for recovering gold by gravity concentration and froth flotation. This commonly applies, but is not limited to, ore deposits containing GRG gold and sulphide minerals rich in gold (such as: Pyrite, Copper). This process will also recover silver associated with sulphide minerals.

This simple metallurgical concentrator includes single stage crushing, conveying, primary grinding, spiral classification, gravity concentration, slurry pumping, rougher flotation and 3 stages of concentrate dilution cleaning. A regrind circuit can be added upon request.

With this simple flowsheet, you will not be able to separate one metal from another. If you have a polymetallic mineral deposit, you need more complete and sophisticated circuit.

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.

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Description

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
  • Cone Crusher (option)
  • Rod Mill (option)
  • Dry/wet reagent feeders
  • Conveyor belts
  • Primary Ball Mill
  • Regrind Mills (Optional)
  • Gravity Concentrator
  • Shaker Table
  • Spiral classifier
  • Flotation cells
  • Sump pumps
  • ROM = 100 mm
  • Jaw crusher F80 = 75 mm
  • Jaw crusher P80 = 12 mm
  • Rod Mill F80 = 15 mm
  • Rod Mill P80 = 800 µm
  • Ball Mill P80 = 95 µm
  • Spiral classifier overflow = 33%
  • Rougher pulp density = 33%
  • 1st Cleaner pulp density = 18%
  • 2nd/3rd Cleaner density = 15%
  • Rougher Retention = 23 minutes
  • Flotation Reagents used:
    Lime, PAX, MIBC

Our standard packages are for process plants of:

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.

250 tpd grg gravity gold flotation plant jaw rod mill


250 tpd grg gravity gold flotation plant cone ball mill

In general, the predominant sulfide in massive sulfide deposits in the United States is pyrite and the logical place to route this mineral is to the tailings since it normally has no economic value. There are two avenues to accomplish this:

  1. Make a bulk float of all sulfides, followed by selective separation of the valuable minerals from the pyrite which is then sent to tailings.
  2. Make a selective float of the valuable minerals at the beginning, depressing the pyrite at the same time by use of a high-lime condition in the flotation.

Both avenues are used, or sometimes partial combinations of both methods. In general, lime is an effective depressant for pyrite.

It is worthy of note that mining of many deposits was discontinued in the past when zinc content increased, rendering either the lead or the copper concentrate less saleable. Today selective flotation of lead and/or copper from zinc enhances the value of the lead or copper concentrates and offers the additional possibility of producing a marketable zinc concentrate.

Some characteristics of massive sulfide ores that should be taken into account in mill design are the following:

  1. Massive sulfide ores tend to be relatively soft and brittle and can be ground easily.
  2. Since the specific gravity of the pulp is relatively high, easy-flow launders and adequate agitation must be provided.
  3. The rougher flotation, capacity must be designed for the increased heavy material loads.
  4. Cleaning and regrind capacity must be adequate to 1 handle the heavier quantities also involved.

In an average porphyry copper operation, concentration ratio typically varies between 20 to 1 and 10 to 1. This means that circuit capacity, after the rougher flotation step, only has to be capable of handling 5 to 10 percent of the ore tonnage. However, in the case of massive sulfide deposits being treated by an initial bulk flotation, the subsequent tonnage to be treated is easily 50 percent of the original ore tonnage and is of an average high density. This means larger equipment is required which results in higher power costs. Even an initial selective flotation for the minerals of economic interest can reduce the size of the subsequent plant only marginally.

At the turn of the century and for years later a very intimate mixture of copper and lead minerals with zinc caused problems of severe proportions. In these cases, such fine grinding was necessary that the liberated minerals were ground finer than the range for efficient flotation separation and recovery. Recent developments such as leaching, liquid ion exchange separations, and new smelting techniques allow consideration of including the mixed sulfides in a bulk concentrate, with subsequent separation by other methods.

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