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Due to the low gold content in placer gold ores, generally raw ores need to be sorted and then further purified to obtain high-grade concentrates. Therefore, the placer gold ore beneficiation process consists of two parts, namely separation and purification.
The overall treatment process of placer gold ore includes three steps: screening, sorting and purification. Since the floatability of gold is better than that of sand and gravel, and the gold in placer gold mines is basically in a free state, the flotation method is one of the more cost-effective and efficient methods. When purifying the concentrated placer gold concentrate, the mercury amalgamation method can be used, which can further improve the recovery rate of the concentrate.
After being crushed and screened, the raw placer gold ore enters the grinding process. The ground products and gangue minerals are basically separated into monomers, and then enter the amalgamation cylinder together with the minerals screened by the screening machine for processing. They can be recycled first. Some solid gold. The slurry that is not easily recovered enters the mixing barrel and is mixed evenly, then enters the flotation machine for one stage of rough separation. The coarse concentrate undergoes two stages of separation to obtain placer gold ore. If the placer gold ore contains iron ore, to avoid waste of resources, the roughing tailings should be subjected to two stages of sweeping and two stages of beneficiation. When concentrating, magnetic separation can be used. After two stages of magnetic separation, iron concentrate and tailings can be obtained. mine.
The main features of this process are: energy saving, high efficiency and environmental protection. This process uses a mercury amalgamation cylinder to recover gold first and improve the recovery rate of gold concentrate. In addition, the mercury paste in the mercury amalgamation cartridge can be reused and is almost harmless to workers and the surrounding environment. Medium and large-scale mineral processing plants can use this process to process placer gold ore.
In different processing stages of placer gold mines, different types of mineral processing equipment will be used, mainly including raw material pretreatment equipment, mineral processing equipment and purification equipment.
Placer gold ore pretreatment equipment mainly includes screening and grinding equipment. Screening equipment generally uses vibrating screens. Vibrating screens have the advantages of thorough screening, anti-clogging, energy saving and high efficiency. They are one of the ideal equipment for screening of placer gold ore raw ore. Grinding equipment can be used. This type of equipment is an improved design based on the old grinding mill. It has the advantages of low power consumption, low noise and high efficiency.
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