Gold Recovery - Carbon-in-Pulp Process

1 Principle

The carbon-in-pulp (CIP) gold extraction process refers to the process of crushing and grinding gold-containing ore into slurry, then leaching it with the help of reagents, and then using activated carbon to directly adsorb the dissolved gold from the slurry. The gold-loaded carbon is then desorbed and electroshocked to obtain gold mud, which is directly separated for purification and smelting.

Carbon-in-Pulp

2 Advantages

(1) Strong adaptability, applicable to sulfide ores, oxidized ores and mixed ores;

(2) Simple operation, less equipment and short process;

(3) Fewer operators;

(4) Low investment and low cost.

3 Process steps

The carbon-in-place (CIP) process mainly includes seven operation stages: preparation of leaching slurry, cyanide leaching, activated carbon adsorption, gold-loaded carbon desorption, electrostatic shock to obtain gold mud, gold-removing carbon recycling, and treatment of leached slurry.

(1) Preparation of leaching slurry: crush the gold-containing ore to a particle size suitable for cyanide leaching, and remove impurities from the slurry, mainly removing wood chips to prevent them from clogging the carbon screen.

(2) Cyanide leaching: stir and leach the slurry with the help of reagents.

(3) Activated carbon adsorption: introduce the slurry after cyanide leaching into the adsorption tank, and use activated carbon to adsorb the dissolved gold in the slurry to become gold-loaded carbon.

(4) Desorption of gold-loaded carbon: separate the gold-loaded carbon from the slurry with the help of a carbon extraction screen, and replace the gold complex in the desorption system.

(5) Obtain gold mud by electrostatic shock: the precious liquid obtained by desorption of the gold-loaded carbon is recovered by electrostatic shock to obtain gold mud.

(6) Recycling of gold-removing carbon: After desorption, the activated carbon is treated to remove other aggregates and then enters the adsorption tank for recycling.

(7) Treatment of leached slurry: Cyanide-containing leached slurry cannot be discharged directly, but can be treated with the help of a sodium hypochlorite generator or chlorine gas, acidified volatile alkali solution absorption method.