Gold mine carbon leaching gold technology

Gold mine slurry impurity removal process

Before gold leaching, impurities need to be removed. An impurity removal operation needs to be set up before the concentration operation and after grinding. Generally, a medium frequency linear vibrating screen is used as the Impurity removal equipment, and select the smallest screen hole size as much as possible while ensuring that the screen surface does not flow.

Concentration process before gold ore leaching

When the overflow concentration of the grinding classification is 18-22%, it is not suitable for direct leaching. High-efficiency concentrator equipment can be used to process the slurry. Concentrated treatment.

Gold mine leaching and adsorption process

The impurity-removed and concentrated slurry is driven into high-efficiency leaching tanks arranged in a ladder shape. Generally, 5-12 leaching tanks are connected in series. configuration. Cyanide is added to the first one or two leaching tanks, and activated carbon is added to the rear leaching tanks. Since sodium cyanide has just been added to the first one or two tanks, the amount of leached gold is small. Therefore, most gold mine carbon leaching and concentrating plants use the first one or two leaching tanks as pre-leaching tanks, and the following leaching tanks are leaching adsorption tanks. .

Generally, each leaching tank is equipped with a carbon screen to separate activated carbon and slurry. Activated carbon and slurry are adsorbed in counter-current flow. Fresh activated carbon is added from the last leaching adsorption tank, while gold-loaded carbon is discharged from the first leaching adsorption tank. Activated carbon becomes gold-loaded carbon by adsorbing gold in the slurry. After the adsorption operation is completed, the slurry containing gold-loaded carbon is sent to the carbon extraction screen through an air lifter to separate the slurry from the activated carbon. After screening and washing, the slurry is sent to desorption electrolysis operation. The gold grade of the slurry solution adsorbed by this method is generally 0.01-0.03g/m³.

Gold mine dehydration and mixing process

Vibration and dehydration equipment are key equipment for the reverse movement of pulp and carbon. The hydraulic filter press and high-efficiency high-frequency dehydration screen designed by Xinhai Mining are used , can effectively reduce the carbon wear of the slurry on the continuous pumping and vibrating screen surfaces, reduce costs, and facilitate maintenance operations. The central inflatable riser used in the mixing process can make the slurry circulate in a small way. Compared with other mechanical mixing tanks, Xinhai's design can reduce power consumption by 70%, and the solid materials are evenly suspended, the activated carbon wears little, and the metal The recovery rate is high. It is an important piece of equipment in a modern cyanide plant.

Gold mine analysis electrolysis process

Xinhai Mining’s desorption electrolysis process uses a mixture of sodium cyanide and sodium hydroxide to desorb gold in gold-loaded carbon at high temperature electrolysis. First, the wood chips and other impurities are removed through an elutriator, and then the Xinhai high-temperature and high-pressure desorption method is used to desorb gold under a high-temperature and high-pressure environment of 150 degrees Celsius and 0.5Mpa. This design can remove 99% of the gold in 2-6 hours. Analyze it.

The concentration of gold-silver cyanide complex ions in the precious liquid obtained by desorption of gold-loaded carbon is relatively high, while the impurity ions are greatly reduced, which provides an ideal method for the electrowinning method to reduce and recover gold from the precious liquid. The solution is finally processed by the Xinhai integrated operation desorption and electrolysis system, and high-purity solid gold can be obtained safely and economically.

Application scope of gold extraction using carbon slurry from gold mines

It is suitable for the beneficiation of large-scale gold mines with higher grades and the beneficiation of gold ores with a high associated silver and copper content. Compared with traditional methods, the carbon slurry method can effectively improve its economic benefits. For smaller gold mining plants, Xinhai recommends using the fine gold ore flotation process.