Gold extraction technology for gold mines

 For different types of gold ores in nature, appropriate gold extraction technology should be adopted. Common gold extraction methods include gravity separation, flotation and cyanidation.

Gravity separation is one of the commonly used methods in gold ore dressing. Based on the difference in mineral density and particle size, mechanical force is used to achieve layered separation in the fluid medium to effectively recover coarse free gold. This method has the advantages of environmental protection and low cost. It is widely used in the treatment of placer gold mines. At the same time, it is used as an auxiliary means of rock gold ore dressing to recover coarse gold in the grinding circuit.

Common equipment includes chutes, jigs and shaking tables. In vein gold mines, gravity separation is often used in combination with other processes to improve the overall dressing efficiency and gold recovery rate.

Flotation is widely used in gold ore dressing, especially for the treatment of gold-bearing ores containing highly floatable sulfide minerals. Since gold is hydrophobic and has good floatability, xanthate and black medicine are used as collectors, combined with inhibitors such as lime, cyanide and sodium sulfide, to effectively enrich gold and sulfide minerals into concentrates.

Flotation can not only efficiently recover gold, but also realize the comprehensive utilization of multiple metals, such as enriching gold into copper and lead concentrates for further extraction.

As the main process for efficient gold recovery, cyanidation is particularly suitable for treating gold-containing oxidized ores with high sludge content. Cyanide leaching is performed on the crushed and ground ore, and cyanide ions react with gold to form a complex that dissolves in the solution, and then activated carbon adsorption, electrolysis or zinc powder replacement, and then smelting to extract gold.

Common cyanide gold extraction processes include carbon leaching, carbon slurry, pool leaching, heap leaching, etc.