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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High Sulfur material Gold Recovery (2 replies)

D
Dossa
2 years ago
Dossa 2 years ago

How can i recover gold from refractory gold ore having high content of sulfur by chemical treatment?

J
Jorge
2 years ago
Jorge 2 years ago

You should consider the Albion Process, which is a combination of ultrafine grinding and oxidative leaching at atmospheric pressure. The sulphides in the feed are oxidized and valuable metals liberated, with the gold can be recovered by conventional downstream processing.

https://www.911metallurgist.com/blog/tag/compare-albion-and-activox

M
metallurge
1 year ago
metallurge 1 year ago

The best (environmental friendly and efficient) method would be the roasting process. in the roasting process energy from oxidation can be recovered as steam / electrical power and the sulfur is converted to sulfuric acid (typically technical quality or better, can be used in fertilizer industry). Compared to Albion Process, the opex of roasting maybe be slightly higher, but the process generates less wastes and does not requires any chemicals (like oxygen, lime), except demiwater and lubrication. The biggest disadvantage of Albion is huge energy consumption and amount of residues. In this process, the sulfur is converted to dirty gypsum (in some countries serious problem with waste management but unfortunately many of countries still accept disposal of such wastes). In most of cases, the roasting process has also higher recoveries. To be fair, The Albion process or Direct Leaching is a great alternative for roasting for material which cannot be fluidized above 500°C, typically due to high content of lead or alkali metals (e.g. processing of Zinc Concentrates with high Pb content) but in case of gold this is mostly not the case.


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