Methods for extracting gold from different types of gold mines

Different gold extraction processes are adopted for different gold ore types. Gold extraction processes include gravity separation, flotation, heap leaching, cyanide, non-cyanidation and non-toxic gold extraction processes, etc.

The gold beneficiation and smelting process includes single gravity separation, single flotation, gravity selection and flotation, mercury amalgamation and flotation, all-mud cyanidation-zinc powder replacement, all-mud cyanide carbon slurry, all-mud cyanide resin gold extraction Process, flotation + gold concentrate cyanidation, heap leaching process, etc.

Combined processes can be used as needed, such as gravity selection - flotation, flotation - cyanidation (concentrate or tailings cyanidation), cyanide - flotation, and gravity selection (flotation) - carbon leaching processes, etc. Applications in Mining.

1. Mercury amalgamation method

This method has its special features in recovering dissociated single natural gold (especially coarse gold). It is based on the liquid metal selectively moistening the gold particles in the slurry to separate them from other metal minerals and gangue. The gold is recovered in high form of mercury and distilled and separated to obtain gold. The advantage is that the gold extraction process is simple, less expensive, and can reduce the loss of gold in the tailings.

2. Chlorination method

The chlorination method has a fast leaching speed and can make the carbonaceous substances inactive. However, if there are reducing substances (sulfides) in the raw materials, it will cause too much chlorine gas consumption. In addition, the acidic chlorine-containing solution is extremely corrosive. , so it has higher requirements for equipment.

3. Flotation method

It is mainly used to process finer veined gold ores, often flotating gold into copper and lead concentrates, and then extracting gold from these concentrates. Therefore, it is more economical and reasonable for ores containing ferrous metals in the raw materials. process, it can achieve comprehensive utilization of multiple metals. The disadvantage is that the recovery rate of oxidized ores is low and it is difficult to capture coarse-grained gold.

The main equipment of the gold mine flotation method is a flotation machine. In addition, ball mills, dryers, spiral classifiers and other supporting equipment are used. Each equipment has important and irreplaceable functions and roles. They are respectively responsible for the selection and selection of gold mines. Grinding, drying, grading and other work.

4. Cyanide method

The process flow was gradually improved. It crushes and grinds the gold-containing ore and then performs cyanide leaching. After the ore slurry is fully leached, activated carbon is added to adsorb the gold in it. The gold-loaded carbon is divided into noble liquid and desorbed carbon with more gold after cleaning and desorption. The liquid undergoes electrolysis to produce gold powder, which is then smelted into gold ingots. After regeneration, the desorption carbon is mixed with new carbon in proportion and used repeatedly in the process.

5. Thiourea method

The precious liquid obtained by dissolving gold in thiourea can, depending on the amount of gold contained, be used to precipitate gold using iron or aluminum replacement or electroplating methods, and the gold mud can be smelted to obtain alloy gold. The smelting process of gold mud is the same as that of cyanide gold mud.

The thiourea gold extraction process is a non-toxic gold extraction process. my country has adopted this method to process gravity separation and flotation gold concentrates. However, this process still has the problem of high cost and unstable operation.

Through the above summary analysis of gold ore beneficiation methods, major gold ore beneficiation plants can find suitable methods in gold ore beneficiation, achieve high-energy separation of concentrates, and improve the recovery rate of ore beneficiation.