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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Bioleaching of Gold (1 reply)

6 years ago
ChemEngStudent 6 years ago

It will be much appreciated if i can get good articles or information about bioleaching of gold and how it differs from more traditional methods.  



6 years ago
(unknown) 6 years ago

Gold extractability was measured by cyanide leaching in the same manner before and after biooxidation. Small samples of ground ore from shake flask experiments were leached by slurrying samples of the ore with one pound of cyanide per ton of solution and bottle rolling in the presence of carbon (bench scale ClL testing). The samples were agitated for 96 hours, after which solution and solids samples were used to obtain a calculated head and total gold recovery. The effect of biooxidation on gold extraction during conventional cyanide leaching was extensively tested in bottle-roll as well as column leach testing.

http://sh.st/yQv03 & http://sh.st/yWxtV

Bioleaching of Gold via Heap biooxidation is proving to be an inexpensive method to oxidize sulfidic ores, including those that are low grade, difficult to concentrate or slow to biooxidize. However, within a biooxidation heap, oxygen mass transfer limitations can limit the applicability of this technology, due to the large amount of oxygen required to biooxidize the sulfides. For example, 50% biooxidation of one ton of a 5% sulfide sulfur pyritic ore requires over a quarter ton of air. Improvements in heap biooxidation that address the oxygen limitations will broaden the appeal of this means of treating sulfide refractory ores.

Many of the practices developed for the heap leaching of oxide gold ores are incompatible, detrimental or suboptimal for use in heap biooxidation. Heap biooxidation involves growing and nurturing millions of living microorganisms per gram of ore. The needs of these microorganisms are simple, yet neglect of these needs will result in a failure of the biooxidation of the sulfide minerals.


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