The extraction of gold. Effective processing technology.

Increased gold recovery from carbonaceous gold ores.

 

 

The use of this technology can significantly reduce the amount of organic carbon in the products that are sent for hydrometallurgical processing, increase by 2 times gold extraction when cyanide leaching, which is carried out by heating the pulp in the special conditions.

 

Technology description

Description of the installation

 


Description of technology:

The use of this technology can significantly reduce the amount of organic carbon in the products that are sent for hydrometallurgical processing, to increase 2 times the extraction of gold when cyanidation, which is carried out by heating the pulp in the special conditions.

The main method of extraction of fine gold is the cyanidation process. The essence of this process lies in the leaching of precious metals using dilute solutions of cyanide salts of alkali or alkaline earth metals. Received gold-containing solutions are separated from the solid phase (tailings) in the thickening or filtration and directed to the deposition of noble metals of metallic zinc. The precipitate precious metals after appropriate treatment sent to refining to produce pure gold and silver.

Natural active carbonaceous substance in ores has a negative effect on gold recovery by cyanidation. This effect may be enhanced by conducting the oxidation of the sulphides prior to cyanidation, especially with the autoclave method.

The sorption capacity of carbonaceous substances may occur in varying degrees. In some ores, carbonaceous substances have a high settling ability and greatly complicate the process of cyanidation. But there are also ore, in which the activity of the carbonaceous components are much less pronounced or even noticeable, not shown. Therefore, the presence of carbonaceous substances into gold ore does not give us reason to believe its hard. Refractory ores of this type can be installed only to technological challenges. It should be noted that the allocation of carbonaceous substances by flotation typically not give good results in the flotation concentrate along with carbonaceous components moving also the most easily flotation DK particles of native gold.

This technology of processing of carbonaceous gold ores allows to reduce the sorption activity of the products sent to cyanidation, while reducing their output.

The technology involves the removal of the carbonaceous substances by flotation prior to sulfide flotation, followed by gravity treatment of sulfide flotation concentrate.

 


Description of the installation:

The installation allows to double the extraction of gold from poor ores. It is completely automated, it works 24 hours a day in a continuous mode in countercurrent.

System management allows you to perform dosing of coal, flow, output and heating solutions, as well as provides access to the specified parameters in automatic mode. The desorption process occurs at a temperature of 170-175 degrees and a pressure of 1.0 MPa. The volume of the stripper is designed for 100 liters.

Due to the automation can be adjusted as the supply of coal and eluent to the apparatus, that allows a wide range to change the maximum capacity, depending on the concentration of gold in the original coal entering the process. Regardless of the source of gold content on the coals, you can get the eluates with a concentration of 1-1. 5 grams of gold per liter due to the operation of recycle