Gold Mine process is typically determined by the physical properties, chemical properties and mineralogical properties of gold and gangue, such as the specific gravity difference is large, coarse grained disseminated gold ore, generally by gravity separation process; mineral surface wettability difference Large or dilute gold ore with fine grain size is generally treated by flotation.
For some complex refractory gold ores, in order to maximize gold recovery and recycle other useful ingredients, it is technically necessary to choose a multi-process joint process, which is economically justified.
There are two main types of common gold ore: quartz vein type gold ore and sulfurized gold ore.
1. Quartz vein type gold ore: The quartz vein type gold ore beneficiation process is mainly cyanidation method and flotation method. The determination of the process mainly depends on the particle size of gold and the symbiotic relationship with other minerals. In the case of contaminated or thin film free gold on the surface of the ore, a part of the gold can be recovered by jigging re-selection to reduce the tailings grade and reduce the cyanide leaching time.
When the ore floatability is good, the quartz ore-bearing gold ore flotation can produce tailings treated by the cyanidation process, and the flotation tailings can be floated and then floated to improve the flotation recovery rate. In most cases, cyanidation is more common in quartz vein type gold ore. The main considerations are ore grinding fineness, cyanide concentration in the slurry, and leaching time. At the same time, in order to reduce the amount of cyanidation work, a process of re-cyanation of flotation concentrate can be employed.
2. Sulfide-containing gold ore: Most gold-bearing sulfide ore can be treated by flotation, and some can be treated by cyanidation, or by a combination method, or by amalgamation , re-election or a combined process.
The choice of flotation or cyanidation process depends on the recovery rate of gold, the comprehensive utilization of associated minerals, etc. If the ore contains more coarse gold, it must be pre-selected because coarse gold is in the cyanide solution. Dissolution is difficult and the flotation process is difficult to recycle. When the surface of the gold particles is clean and there is no harmful component in the ore, the amalgamation method is better than the re-election method. In the production practice, the commonly used gold-containing sulfide ore dressing process is: first flotation, flotation concentrate can be directly cyanidated, or can be cyanated after grinding, or by re-election and amalgamation.
For the gold mining plant, try to adopt a mature, simple and easy production process. Under this premise, there must be room for the selection of mineral processing equipment and construction of the plant, which will provide conditions for future production development and process improvement.
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