After the primary gold deposits are 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 transportation and sorting of external forces, minerals with a larger specific gravity (such as gold particles) are deposited on hillsides, riverbeds, and lake shores to form a certain enrichment, which has industrial mining value. called placer gold deposits.
Placer gold deposits are usually mined by gold 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 the preparation and sorting operations before sorting. The preparation work is mainly composed of two processes of crushing and screening. Fragmentation is mainly to dissociate the ore particles and clay slime in the mined ore sand. Sieving is the sieving of the coarse fractions that do not contain gold. Commonly used equipment are flat screen, cylindrical screen, cylindrical scrubber and so on. The selection of placer gold mainly adopts gravity beneficiation method. This is because on the one hand the proportion of placer gold is large (17.50-18.0 on average) and the particle size is relatively coarse (generally 0.074-2 mm), on the other hand, the gravity beneficiation method is relatively economical and simple. . Gravity equipment generally uses various types of chutes, jigs and shakers (commonly used for selection).
Various types of gold ore have different beneficiation methods due to their different properties, but the new gold extraction processes of gravity separation, flotation, amalgamation, cyanidation, carbon slurry adsorption, and heap leaching are commonly used. For certain types of ores, the combined gold extraction process is often used.
Shandong Mining Engineering Machinery Co., Ltd. is an enterprise specializing in the research, production and sales of rock drilling tools. Its products mainly include: rock drilling tools, blast furnace drilling tools, mining picks, engineering tools, shield tools, coal mining tools, anchor drilling tools, down-the-hole tools, breakers and pick drills, air pick drills, special steel drills With cemented carbide and various mining machinery equipment and accessories.