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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Reduce Fineness of Gold (3 replies)

Rahil Khan
8 years ago
Rahil Khan 8 years ago

ILR pregnant solution is expected to contain much impurity than the CIL or CIP pregnant solution for electrowining. This may be due to the intensive leach conditions in the ILR than in the CIL or CIP.

I want to know which process contributes to lesser gold fineness and how they can be improved. How about blending the two solutions for the electrowinning circuit to increase the Fineness of Gold bullion.

(unknown)
8 years ago
(unknown) 8 years ago
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Gold bullion produced from ILR solution does not need to have lesser fineness than that produced from CIL/CIP solution. In fact, I would argue the opposite, if you ensure gravity concentrate fed to your ILR is clean enough (i.e. no junk material in it. Make sure gravity concentrators work properly). Also you should be able to confidently measure fineness of bullion from both circuits. That is if you have separate EW circuits for the CIP/CIL and ILR solutions (i.e. achieved by hard piping). I say this because some in some plants operators blend ILR pregnant solution with CIL/CIP solution. Normally ILR pregnant solution grade will be higher than that from CIP/CIL circuit, hence higher gold content in the ILR bullion. This was my experience in the plants where ILR was installed. For example bullion from the CIP circuit averaged < 92% Au, whilst bullion from ILR circuit averaged 95-97% Au. Having made my argument I would also say you need to analyse each and every case to identify any issues and find appropriate solutions.

Rahil Khan
8 years ago
Rahil Khan 8 years ago
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I was arguing from the fact that intensive leaching may lead to co leaching and stuff. Having made that however, experience is all I seek from those who might have worked with both circuits.

Oberfuhrer
8 years ago
Oberfuhrer 8 years ago
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You will have fineness of bullion produced by intensive leach much higher than from CIL.


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