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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CIL circuit gold loss (2 replies)

A
John KK
5 years ago
John KK 5 years ago

We are running CIL circuit , 2 leaching thanks and 7 leaching&adsorption tanks.gold deposit is a greenschist facies lode gold deposit in which most
of the gold is hosted as free gold by quartz-sulphide vein in altered
microgranite, with minor gold associated with the altered wall rocks.

Our solid tails gold was >0.1[g/t], but now more than double , our cyanide concentration is 500ppm in the first tank and >20 ppm in the last tank. pH from tank number five to nine is below ten ..[in number nine 7]. Does this low pH have great influence in the availability of free cyanide or in the increase of solid loss.

 

 

J
Jose Doneiber
5 years ago
Jose Doneiber 5 years ago
1 like by John KK

Hi. 
I don't know much about it, but from what I understand it is very convenient to work with a pH of 10.5 to 11.5.
Sweats

T
TonyE
5 years ago
TonyE 5 years ago
1 like by John KK

Your concentration of cyanide in your last tank is low. It should be at least 150 ppm. The Low pH in the last tanks is the reason. HCN is being produced in the process due to lime (or other pH modifiers) being consumed. This usually occurs when there has been large scale oxidation of sulphides in the ore body or feed stock. The way around this is to increase your lime addition at the head of the train and include addition along the tank train until the pH in the last tank is pH11. Make sure you have enough dissolved oxygen in the train as well.

Cheers


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