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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Tainling grade and pH (1 reply)

Samuel Trindade
3 years ago
Samuel Trindade 3 years ago

Hello Gents!

I've occasionally facing some recovery problems. I've done some diagnostic leaching tests and it seems to have encapsulated gold in sulphide. Crossing a lot of process data I've noticed a subtle relation between increasing in tailing grande with increasing of the pH tailing (little increase from 9,5 to 9,9 average) even with head pH under control...but I don't know how to explain this relation or even if it makes some sense. Could you guys help me with that?

Thanks in advance!


3 years ago
Jorge 3 years ago

It is important to know the gold grade reported in tailings. You did not provide that data. Now, considering the fact that you have a refractory gold ore, it is possible that the distribution and content of iron sulphides could be different in the leaching circuit. Other point to consider is the particle size, some refractory ores are more sensitive than others. I don't know if you determined the gold distribution size by size in the tailings stream. If you didn't, it could give you some additional information about the gold distribution. Also, take a sample of the feed and perform a particle size distribution to know the gold distribution. Try to compare the gold recovery size by size.

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