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The content of gold in the ore is generally very low. In order to extract the gold, the ore needs to be crushed and ground to fine particles, and the gold needs to be pre-enriched by mineral processing or separated from the ore. The gold processing method commonly used in the production mainly includes the following:
This kind of gold processing method includes amalgamation before gravity separation process and gravity separation before amalgamation process.
Gravity separation before amalgamation process is mostly used for the extraction of low-grade alluvial gold or the ore with coarse disseminated grain size and contaminated surface. Amalgamation before gravity separation process is mostly used for simple quartz vein gold-bearing sulfide ore, and when gold is monomer in the ore.
This kind of gold processing method is suitable for the gold-containing oxidized ore of quartz vein type with uneven grain size and deep oxidation. The kind of ore should be basically free of elements such as copper, arsenic and antimony. This kind of gold processing method is suitable for small mines owned by individual.
Gold flotation method is suitable for the extraction of gold-bearing quartz veins with fine gold particles and good floatability, gold-bearing altered rock type ores, and for ores containing various sulfides. This gold processing method is suitable for small to medium or large gold processing plants.
This gold processing method is suitable for gold-bearing quartz veins with misproportion dissemination and low-sulfur. Since the monomer-separated gold is recovered in a timely and early manner in the grinding circuit, the total recovery of gold can be increased. This gold extraction process is a widely used process in China's gold processing plant, in which the gold recycling rate of gravity separation can reach 30~60%.
This gold processing method is applicable to all-ferritization pyrite quartz vein type ore or gold-bearing alteration diorite-type ore with fine grain size and deep oxidation. The ore is required to contain no elements harmful to cyanidation such as copper, arsenic or antimony.
This gold processing method is applicable to the gold-bearing pyrite quartz vein ore which is closely related to the symbiotic relationship between gold and sulfide. It is also suitable for the altered rock type ore of the gold-bearing granite fracture zone, especially for high sulfur ore. This gold processing method is also one of the common gold extraction processes in China's mines.
This gold extraction process is applicable to gold-bearing quartz vein type ores containing elements such as arsenic and antimony. The roasting process is a preparation for cyanidation in order to remove elements that are harmful to cyanidation.
The several gold processing method above are typical gold extraction processes. Different mines should select the appropriate gold extraction process according to the nature of their ore and technical and economic requirements. The right one is the best. For example, alluvial gold is usually processed by gravity separation. This is because the gravity separation method is simple and economical compared to other methods, and because the alluvial gold's specific gravity is large and the particles are coarse, it is easy to be separated by gravity separation.