Sulfide gold ore refers to gold ore containing sulfide minerals. It is an important type of gold resource. It is mainly composed of pyrite (FeS2), toxic sand (FeAsS) and other sulfur-containing minerals and gold compounds.The gold content in this type of ore may be low, but the total amount is huge and has important economic value.

In these minerals, gold is closely combined with sulfides, but gold usually exists in the form of fine particles, which is difficult to effectively recover through traditional physical mineral processing methods, so chemical leaching technology is required to extract gold.

The following will introduce several extraction processes to you.
1. Gold cyanide leaching
Cyanide leaching is a leaching method that uses cyanide (such as sodium cyanide, potassium cyanide, etc.) to chemically react with gold in sulfide gold mines to dissolve gold into solution.Under appropriate conditions, cyanide can dissolve gold highly selectively while inhibiting the dissolution of other metal ions.It can be used for both coarse-grained ores and fine-grained ores, especially for processing difficult-to-leach vulcanized gold mines.

Cyanide leaching method is currently one of the most widely used gold leaching methods, and the recovery rate of gold can reach more than 90%.However, cyanide is toxic and has a certain impact on the environment.Therefore, when using the cyanide leaching method, strict environmental protection measures need to be taken to ensure the discharge of wastewater and waste residue up to standard.

2. Gold thiourea leaching
The thiourea leaching method is a leaching method that uses the biochemical reaction of thiourea (CS (NHNH)₂) with the gold in sulfide gold mines to dissolve the gold into solution.Generally, it needs to be carried out at a higher temperature (between 60-80°C), and the energy consumption is relatively high.

The leaching speed of thiourea leaching method is faster than that of cyanide leaching method, which can achieve a higher gold recovery rate in a shorter period of time, has less environmental pollution, and can handle some complex ores that are not sensitive to cyanide or contain a lot of interfering elements. Ore.In addition, the thiourea solution can be regenerated and recycled by electrolysis, which reduces operating costs.

3. Gold chlorination leaching
Chlorination leaching method is a leaching method that uses chlorides (such as chlorine, sodium chloride, iron chloride, etc.) to chemically react with gold in sulfide gold mines to dissolve gold into solution.It can be applied to various types of sulfide gold mines, including difficult ores such as high arsenic, high sulfur, and high carbon.

The chlorination leaching method can leach gold within a wide pH range, has a strong decomposition ability of sulfide minerals, and can simultaneously recover other valuable metals in the ore, such as copper, lead, zinc, etc., to improve the comprehensive utilization rate of resources.However, the chlorination leaching method requires the use of corrosion-resistant equipment, because chlorine and chloride are highly corrosive.

Since each method has its own unique advantages and limitations, it is necessary to choose a suitable method based on comprehensive considerations such as the specific nature of the gold ore, the type of mineral contained and the production conditions.