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

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction 2017-03-23T09:50:58+00:00
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Gold VAT leaching (4 replies and 3 comments)

kahonde
5 months ago
kahonde 5 months ago

hello i have been trying to vat leach a sulfidic gold ore using cyanide at 0.2% and a pH of 10.5-11 but gold of about 3g/t is still reporting in tails after 40 hours of leaching from a head of 5.88 g/t. HELP...vat leaching is the only method i can use because of limited resources. thank you

 

Cyanide
5 months ago
Cyanide 5 months ago

Are you SURE your gold is liberated?

kahonde
5 months ago

not sure but its 300um and im intending to reduce the size and try again

ThabisoKwenane
5 months ago
ThabisoKwenane 5 months ago
2 likes by David and Cyanide

Ensure your gold is liberated. Normally if gold is not in nuggets but locked in small particles, it is milled to 80% passing 75 microns. But since you doing vat leaching, try to have a wide distribution that consist of liberated gold in it. It does't have to be fully liberated, even partially liberated will do.

kahonde
5 months ago

wide distribution meaning particle size analysis and try to leach different sizes?.can you explain

Cyanide
5 months ago
Cyanide 5 months ago

Grind everything to P80 under 75 microns and leach away. Let us know.

kahonde
5 months ago

ok thank you im on it now.

max skinner
5 months ago
max skinner 5 months ago

Yes, the above answers are good. Always when doing any type of extractive metallurgy on a sulfide gold ore  you must find out if the gold is in the sulfides or with the sulfides, a big difference. If with the sulfide you should not have many problems getting good recovery, if the gold is in the sulfide then you must grind to where you have liberation in order to get an acceptable result, and this grind my be fine enough that a gravity vat leach my not be impossible.


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