Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction

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carbon flow (2 replies)

6 years ago
nicolas 6 years ago


i operate a gravity vat leach plant, i treat tailings from artisanal workers after recovery of free gold. I got twelve 30 tons tanks. As tails are argillaceous, i melt 15kg/ton cement to pelletize the tails . What flow rate do i need in tank to have good recovery?

Thus i got 6 carbon basket with 150 kg of carbon per basket.What should be the good flow rate in carbon ?


6 years ago
Deano 6 years ago
1 like by David

There is no general flow rate applicable for all vat leaches, the variables are too many.

Flow rate through a vat leach is dependant on the leachable grade of the ore, how coarse or fine the gold is,the amount of carbon in the circuit for that particular vat and the condition of the carbon.

The only way to set your flow rate is to check gold in solution levels in and out of the carbon column and set the flow rate such that you maintain the greatest loading rate onto the carbon.

You usually run a scavenge column of the same carbon volume.


6 years ago
Jorge 6 years ago
1 like by David

If you don't perform a testing program to evaluate operating parameters, the gold extraction would not be as high as you want. It is important to evaluate the pellets too. You can try 30 l/h/m2, you can change the flow rate if there is any operating problem or the estimated gold extraction is low. It important to indicate that higher flow rates can be used, the final selection should be based on mineralogy and pellets resistance.

Most of Carbon-in-Column designs downward consider that the maximum solution flow must range 4 to 6 g/min/ft3 and the ideal solution must be free of particulate matter due to the bed of activated carbon works like a water filter and will eventually become plugged if excessive slimes are present in the adsorption system. 

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