Carbon in pulp



Carbon in Pulp (CIP) is a technique for recovery of gold extraction technique.

Introduced in 1985, Carbon in Pulp is regarded as a simple and cheap process. As such it is used in most industrial applications where the presence of competing copper does not prohibit its use.

solution. Hard cyanide solution mixture. The gold cyanide complex is adsorbed onto the carbon until it comes to an equilibrium with the gold in solution. Because the carbon particles are much larger than the ore particles, the coarse carbon can then be separated from the slurry by screening using a wire mesh.

Loading gold into carbon

Leached pulp and carbon are transferred in a counter current flow arrangement between a series of tanks, usually numbering 4 to 6. In the final tank, fresh or barren carbon is put in contact with low grade or tailings solution. At this tank the fresh carbon has a high activity and can remove trace amounts of gold (to levels below 0.01 mg/L Au in solution).

As it moves up the train, the carbon loads to higher and higher concentrations of gold, as it comes in contact with higher grade solutions. Typically concentrations as high as 4000 to 8000 leached ore and pregnant leach solution (PLS). This can be measured by comparing the amount of gold extracted from the carbon to the amount of carbon used.

Removal of gold from carbon

The final loaded carbon then is removed and washed before undergoing "elution" or pH. gold extraction industry.

Electrowinning

The rich eluate solution that emerges from the elution process is passed through cathodes. refinery. For further information on gold smelting, see the article on gold extraction.

See also

Other gold cyanidation techniques:

 
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