First of all, gravity separation plays an important role in gold ore dressing because of its simple operation and low cost. This method mainly uses the density difference of minerals for sorting. Gold can be efficiently separated from heavy sand minerals through equipment such as shaking tables, screening equipment, and jigs. In particular, gravity separation has significant advantages in the recovery of coarse gold.
Secondly, flotation is also one of the commonly used low-cost methods in gold ore dressing. It relies on the chemical properties of the mineral surface for separation. By adjusting the pH value of the slurry and using flotation reagents, gold particles are separated from other mineral particles to form gold concentrate. Flotation can achieve a higher gold recovery rate when processing ores where gold and sulfide coexist.
In addition, gold heap leaching has been widely used worldwide in recent years as an environmentally friendly and low-cost mineral processing method. This method uses chemical solutions to leach gold from ore by piling the ore on a leak-proof heap leaching site. The cyanide solution reacts chemically with gold to form a soluble gold-cyanide complex, and then the gold is extracted from the solution by methods such as activated carbon or zinc powder replacement. The equipment and operating costs of the gold heap leaching method are relatively low, and it is particularly suitable for processing low-grade ores.
Gold mines can be divided into sulfide-poor gold mines, polysulfide gold mines, gold-bearing polymetallic ores, gold-bearing copper ores, and so on. Depending on the type of ore, the processing methods used by the beneficiation plant are also different. For example, flake, blade and plate-shaped gold are mostly recovered by flotation or cyanidation, and the effect of recovering the above-mentioned types of gold by gravity separation or amalgamation is not good, and then the recovery of granular or spherical gold is good. Therefore, in actual production, according to the characteristics of various types of gold ores, one or more gold ore beneficiation methods should be selected from gravity separation, flotation, cyanidation, amalgamation and other technologies to carry out gold ore beneficiation.
The above is an introduction to the commonly used gold ore beneficiation methods for gold extraction from gold ore. Under the premise of rapid technological innovation, there are more and more methods for gold extraction. In addition to the above methods, there are also non-cyanide leaching, amalgamation and biological gold extraction methods. But no matter which method is used, it needs to be adapted to the properties of the ore and various beneficiation conditions. If you want to obtain a more ideal gold recovery rate, it is recommended to conduct beneficiation tests and design a suitable gold extraction process through experimental analysis.
