Flotation is a beneficiation method widely used in current gold concentrators, that is, various flotation reagents are added during the separation process to adjust the physical and chemical properties of selected minerals and flotation media, and expand gold minerals and gangue The difference in hydrophobicity between minerals, so as to realize the separation of gold minerals and gangue minerals. The method can enrich gold in sulfide mineral concentrates as much as possible, and is beneficial to realize the comprehensive recovery of mineral resources.

Suitable for selection of gold ore by flotation method
In production practice, when gold-bearing ore has the following characteristics, the flotation method can be considered for separation:

■ Ore in which gold and sulfide are in close symbiosis;

■ Although most of the gold does not co-exist with sulfide, but the ore contains a considerable amount of metal sulfide and has formed a stable foam containing gold sulfide;

■ The ore does not contain sulfides, but contains a large amount of iron oxide (such as iron caps). At this time, the ocher mud can stabilize the foam;

■ The ore does not contain sulfide or iron oxide, but contains minerals (such as sericite) that can enter the foam and can stabilize the foam;

■ Pure quartz gold ore is pre-mixed with sulfide ore in a certain proportion, or about 3% metal sulfide is added, or the appropriate one is selected so as to form a stable foam;

■ The main metals (copper, lead, zinc, etc.) in the gold ore have been recovered by flotation, and the tailings need to be cyanided.

Generally speaking, sulfide gold-bearing quartz vein ore with fine gold particles and good floatability, gold-bearing sulfide ore containing multiple valuable metals (such as copper, lead and zinc) and gold-bearing graphite ore are suitable The flotation method is used for recovery.