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

Hydrometallurgy: Leaching in Heap, Vat, CIL, CIP, Merrill–Crowe, SX Solvent Extraction2017-04-04T06:57:36-04:00
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Cyanide Leaching of Mercury (3 replies)

4 years ago
Amar 4 years ago

In gold ore cyanidation I want to know which form of mercury (native, cinnabar, metacinabbar) can be leached?

4 years ago
Hauptsturm 4 years ago

By its nature mercury will dissolve in Cyanide, and also in Thiosulphate! However the rate of depends somewhat the form of mercury. HgS is less soluble than Hg(1) or Hg(2).

The best way to mitigate mercury dissolution is to reduce the leach temperature and add a sulphide mineral to precipitate any mercury that is dissolved, H2S or NaHS are preferred. A recent paper on this is by Newmont but older papers by EPA & USBM are still valid and effective guides.


4 years ago
(unknown) 4 years ago

Maybe the question should be phrased as "What is the best method of recovering mercury and gold from mercury flour at mining sites" where mercury amalgamation was used? Mercury has value and removing it from mine tailings would help clean up the environment.

4 years ago
(unknown) 4 years ago

The metallic mercury is leached by cyanidation, while as cinnabar can be leached with HCl - IK.

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