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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Leaching of gold ore with higher amounts of base metals. (2 replies)

3 weeks ago
Fahmy 3 weeks ago

Hi guys, I’d like to know what does the blue color indicate in the barren solution from VAT leaching, plus excessive dropping of cyanide concentration, I understand this occurs from the presence of higher amounts of other metals in the ore, but I don’t know exactly what are the metals. And how can you treat the metals for efficient and lower cost leaching.

3 weeks ago
Jorge 3 weeks ago

A blue color indicates the presence of copper. It is important to determine the mineralogical specimens in the ore. A bottle roll testing program can be performed to determine the gold extraction and the dissolution of copper. Sometimes, it is not economic to process this kind of material. 

If you have logging data, you should review it to get an idea of the ore quality.

3 weeks ago
SmartDog 3 weeks ago

As jore said, the color is probably due to copper.  Copper being soluble in cyanide can (usually) lead to excess cyanide consumption.  See: https://www.911metallurgist.com/blog/dissolution-of-precious-metals-in-copper-cyanogen-complexes)

This does not mean that the ore cannot be leached, but does mean a more complex process maybe needed.  Such as an ammonical leach for the copper followed by cyanide for the precious metals.  This will require vat or tank leaching.

An alternative is flotation, especially if the ore grades (including copper) are high enough.  See: https://www.smartdogmining.com/topics/Cyanide%20Alternative.html


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