METHOD OF GOLD EXTRACTION FROM MINING CONCENTRATES Russian patent published in 2008 - IPC C22B11/02 

FIELD: metallurgy of non-ferrous metals.

SUBSTANCE: invention is related to the precious metals metallurgy and can be used for gold selective extraction from the mining arsenical pyrite gravitational and flotation concentrates utilised at the gold-extracting manufacturing plants with a view to reach the affinage (i.e. gold refining) requirements. The gold extraction from the mining arsenical pyrite concentrates in a metal alloy can be brought into effect with the presence of a melted caustic alkali (NaOH) with an intensive mechanical mix of the system by applying a blade stirrer. The process must be performed under the 330-350°C range of temperatures; the weigh relation of the NaOH concentrate equals 1-(0.8÷1) during 8-15 minutes whereby the gold-arsenic particles start to be extracted from the pulp of an aqueous desalination of an alkali alloy by the gravitational method. The technical result of this invention is exclusion of introduction of led, reduction in temperature and consumption of the caustic alkali, while extracting sufficient quantities of gold.

EFFECT: increase in volumes of gold extraction from the mining concentrates, while reducing the temperature and caustic alkali consumption.

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