What are the dimensions of gold mine cyanide leaching tests?

Cyanide leaching is one of the main methods for extracting gold from gold ore. For the treatment of gold-bearing ores using cyanide leaching, the recovery rate of cyanide leaching mainly depends on the effect of the leaching operation.

How to adopt reasonable leaching processes and equipment and how to select reasonable leaching conditions while maintaining the overall cost of the dressing plant and improving the technical and economic benefits of the dressing plant require gold leaching tests to determine.

01 Grinding fineness test

The monomer dissociation of gold or the exposed gold surface are necessary conditions for cyanide leaching, and the grinding fineness is a key factor affecting the mineral monomer dissociation. In order to ensure that cyanidation achieves higher indicators, it is necessary to study the impact of the particle size of selected materials on cyanide leaching, so as to determine the appropriate selected particle size based on the properties of the material.

02 Leaching time test

Leaching time is one of the important factors affecting gold leaching. During the leaching process of gold, as time goes by, the leaching rate of gold gradually increases. However, due to the gradual increase in the thickness of the saturated solution layer on the gold surface, the leaching rate continues to decrease, and the leaching rate gradually tends to a constant value.

03 Protective soda lime dosage test

CN- is very unstable in solution and easily volatilizes into hydrogen cyanide gas causing chemical loss of sodium cyanide. Therefore, lime is added to protect the alkali in the slurry so that the slurry maintains appropriate alkalinity. The addition of lime can prevent the cyanide in the solution from forming HCN and volatilizing. It can also cause some of the iron ions in the solution to form ferric hydroxide and precipitate, reducing the consumption of cyanide.

04 Slurry concentration test

The concentration of the slurry will directly affect the leaching speed and leaching rate of gold. The greater the concentration, the greater the viscosity of the slurry and the poor fluidity, the lower the gold leaching speed and the gold leaching rate; when leaching, the slurry concentration is low, the slurry has good fluidity, and the gold leaching rate is high, but the dosage of chemicals will become When the equipment is doubled, the equipment volume and investment cost will also increase accordingly. Therefore, a suitable leaching slurry concentration is required to balance the gold leaching rate and production costs.

05 Gold immersion agent dosage test

In the cyanidation process, the dosage of cyanide agent is directly proportional to the gold leaching rate within a certain range. However, when the dosage of cyanide agent is too high, the cost increases, but the gold leaching rate does not change much. At the same time, the addition method of cyanide agent also has a certain impact on the leaching rate and leaching speed of gold.