Commonly used beneficiation methods for gold beneficiation

Some of the production of gold comes from placer gold, and some comes from vein gold. Since the 1970s, the output of vein gold has remained at 75-85%, and placer gold has accounted for 15-25%.

Commonly used beneficiation methods for placer gold ore:

After the primary gold deposit is exposed to the surface, due to mechanical and chemical weathering, the gold-bearing veins or gold-bearing parent rocks are gradually broken into cuttings and gold particles. Then, under the action of transportation and sorting by external force, minerals with relatively large specific gravity (such as gold particles) are deposited on hillsides, riverbeds, and lakeshores to form a certain enrichment. Those with industrial mining value are called placer gold deposits.

Placer gold deposits are usually mined by dredgers, hydraulic mining, excavator mining, and underground (shaft) mining. my country's placer gold deposits are mainly mined by gold dredgers, and there are also hydraulic mining and excavator mining.

The placer gold beneficiation process mainly includes preparatory homework before sorting and sorting homework. The preparatory homework is mainly composed of two processes of fragmentation and screening. Fragmentation is mainly to dissociate the ore particles and clayey slime in the mined ore. Sieving is to sieve out the coarse fraction that does not contain gold. Commonly used equipment includes flat sieves, cylinder sieves, cylinder scrubbing machines, etc. The separation of placer gold mainly adopts the gravity beneficiation method. This is because on the one hand, the specificity of placer gold is large (average is 17.50-18.0), and the particle size is relatively coarse (generally 0.074-2mm). On the other hand, the gravity beneficiation method is more economical and simple. . Gravity separation equipment generally uses various types of chutes, jigs and shakers (often used for separation).

Commonly used beneficiation methods for vein gold ore:

Various types of gold ore have different beneficiation methods due to their different properties, but gravity separation, flotation, amalgamation, cyanidation and recent resin slurry method, carbon slurry adsorption method and heap leaching method are commonly used to extract gold. craft. For certain types of ores, the combined gold extraction process is often used.

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