Two kinds of exclusive leaching bacteria used in the two-stage biological pre-oxidation gold extraction process of Carlin-type gold deposits
A pre-oxidation gold extraction, Carlin-type technology, applied in the direction of improving process efficiency, can solve the problems of low gold recovery rate, environmental pollution, etc., and achieve the effect of increased leaching rate and great economic benefits
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[0038] The present invention is applied to a Carlin-type gold mine in Guizhou. The target mineral is natural gold. Under the microscope, a very small amount of microfine gold particles can be seen embedded in gangue, mostly symbiotic with pyrite, and the particle size is extremely small. Metal sulfide minerals are mainly pyrite, containing a small amount of arsenopyrite and very small amounts of sphalerite, chalcopyrite, and galena. The metal oxides are mainly limonite, followed by magnetite and hematite. The gangue minerals are mainly quartz and clay minerals, containing a small amount of fluorite, dolomite, mica, etc., with high carbon content. The ore contains Au3.05g / t, S5.95%, As0.25%, C total 1.44, where C organic 0.52.
[0039] The process of extracting gold from the above-mentioned ores includes the following steps:
[0040] 1. Crushing, fine grinding and flotation of ore
[0041] Crush and finely grind the raw ore to -0.074mm to account for 95%. After activation ...
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