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Cyanide Gold Extraction Process

     

Cyanide Gold Extraction Process

The cyanide gold extraction process, particularly a type of controlled atmosphere gas furnace for decomposing native gold ores under controlled conditions—cyanide leaching method for extracting gold from native ores.

High-temperature gases produced by a coal-fired furnace are supplemented with air and pre-cooled to temperatures between450 and850°C before being introduced into the roasting furnace as leaching gas.

Subjecting native ores to thermal decomposition and oxidative decomposition converts them into mineralized ores.

The roasted mineralized ores are powdered to a particle size of −5 mm and placed into cyanide solution pools for extraction by soaking in sodium cyanide solution.

Gases generated during the roasting of gold ores are sent to the waste gas purification section, where lime is added to convert sulfur dioxide and arsenic oxides into insoluble, non-harmful solid substances—calcium sulfate and calcium arsenate. These are then filtered through dust-removal bags or washed in rain shields before being emitted into the atmosphere.

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