Although the applicability of heap leaching for gold extraction is not as good as that of flotation and cyanidation, many small-scale concentrators still use heap leaching when processing low-grade gold ores. If the effect of heap leaching for gold extraction is not satisfactory, then you should look for the reasons from the following five factors:
Encapsulated gold is a type of gold ore. The characteristic of this type of gold ore is that the gold ore is tightly encapsulated with other minerals, which creates a great difficulty for gold extraction. The gold minerals in the encapsulated gold may be encapsulated by minerals such as sulfides, quartz, and silicates. Among them, the encapsulated gold encapsulated in sulfide ores accounts for a large proportion. So, in what aspects are the difficulties in encapsulated gold beneficiation reflected? How to carry out encapsulated gold beneficiation and gold extraction?
During the cyanide gold extraction process, stibnite will react with NaOH, which will not only consume cyanide and oxygen, but also the generated NaCNS will cover the surface of the ore, resulting in the inability of gold to fully contact with O₂ and CN⁻, thereby affecting the gold leaching rate. Therefore, antimony-containing gold concentrate needs to be pretreated to improve the gold leaching rate.
Mica is a typical layered silicate mineral, and its main gangue minerals include quartz, feldspar, pyroxene, hornblende, etc. The flotation process uses the difference in physical and chemical properties between mica and gangue minerals to separate them. The key to mica flotation technology lies in the type and dosage of reagents, equipment configuration and control of process parameters.
The ore properties of porphyry gold deposits are complex, the gold occurrence states are diverse, the gold minerals are finely embedded, and they are mainly associated with feldspar, quartz, rhodochrosite and other gangue minerals. The beneficiation methods of porphyry gold deposits are complicated due to their complex characteristics. This article mainly introduces the characteristics of porphyry gold deposits and common beneficiation methods.
Quartz vein gold-bearing ore is mainly composed of quartz, with a content of 50-95%. The content of metal minerals is 0-15%, pyrite is the main sulfide mineral, followed by pyrrhotite and a small amount of galena, chalcopyrite and sphalerite. In addition to quartz, the gangue also includes sericite, plagioclase, muscovite, calcite, orthoclase, etc. Gold minerals are mainly free natural gold and silver-gold ores, mostly in fine-grained and fine-veined pyrite, and a small amount in chalcopyrite and quartz.
