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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help on tonage calculation and determination of exhausted carbon (2 replies and 1 comment)

B
Mpiga
6 years ago
Mpiga 6 years ago

hello friends,can some one help me a formula to calculate the capacity( in tons) of the round VAT leaching tank,also what are the indicators to show that the carbon is full,that need to be replaced?

Thanks in advance.

T
Todd H
6 years ago
Todd H 6 years ago

You first need the active volume of the tank = pi* D^2 / 4 * height (use 80% of total H to allow for freeboard)

Then you need the percent solids of the slurry to figure out the weight of the solids

S% = wt solids / (wt solids+wt water)

Volume solids =  wt solids (tonnes) / solids specific gravity (metric tonnes / m3)

You can assume water is an SG of 1. Vol water = tonnes water

As for the carbon capacity - when it is fully loaded the solution tails will go up i.e the gold in the liquid will rise (mg/l).  You can estimate when its is reasonably loaded and just change it at a certain loading.  Loading varies a lot but you can use a typical average to be safe like 3000 g Au per tonne carbon.

See this paper http://www.kemix.com/brochures/Kemix_Activated-Carbon-In-Gold-Recovery.pdf

Todd Harvey - Global Resource Engineering http://www.global-resource-eng.com

B
Mpiga
6 years ago

thank you in advance

A
Alex Spynu
6 years ago
Alex Spynu 6 years ago
1 like by David

For CIP and CIL tanks you can take operating volume about 90-95% of overall volume. 

Nobody determine is it full carbon or not by any indicators. There are precise time and volume when you should transfer full with gold carbon. For determination carbon capacity you should get isotherm of sorption in the laboratory. Or simply if you have CIP proccess take pulp after preliminary leaching and contact it with small amount fo carbon during 20-40 hours. After analyze pulp(solid, solution) for gold and calculate capacity of carbon. When you know how much gold you have in the input of the sorption and capacity of the carbon, you could determine when and how much carbon you need to transfer.


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