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Activated carbon in gold recovery

Activated carbon in gold recovery
03 Dec, 2018

Even to produce few grams of gold, thousands of tons of ore must be mined, crushed, roasted, ground, treated, pulped and leached. Activated carbon plays a key role in capturing the gold from its ore. In any gold mine, any gold that is not adsorbed by activated carbon will be lost. To achieve the highest possible gold yield, selection of an appropriate activated carbon product is crucial. With the focus on quality, minimal fines formation, reliability and services we can make a difference when it comes to maximizing gold recovery in mines and in your gold circuits.

A major use of activated carbon in mining is in gold recovery , where granular activated carbon (GAC) is used for adsorption of the gold-cyanide complex in carbon-in-pulp (CIP) and carbon-in-leach (CIL) systems, or in carbon-in-column (CIC) systems after a heap leach operation carbon. We offer a wide and dedicated product range including extruded and high-quality broken grades for gold recovery applications. These activated carbons combine superior hardness with adsorption/desorption kinetics and capacity, resulting in fewer fines and associated gold losses.

Carbon in Pulp (CIP) Vs Carbon in Leach (CIL) Vs Carbon in Column (CIC)Carbon in Pulp (CIP)

It is the sequential leach then absorption of gold from ore. During CIP stage, pulp flows through several agitated tanks where sodium cyanide and oxygen have been added to dissolve gold into solution, In the absorption stage, this solution flows through several agitated tanks containing activated carbon. Gold absorbs onto the activated carbon which flows into the pulp, while screens separate the barren pulp from the gold-loaded carbon.

Carbon in Leach (CIL)

It is the simultaneous leach and absorption process. The simultaneous leach and absorption phases of the CIL process were developed for processing gold ores that contain preg-robbing materials such as natural absorptive carbon. These reduce the gold yield by attracting gold meant activated carbon. Simultaneous leaching and absorption help minimize the problem.

Carbon in column or Circuits (CIC)

Carbon in column or Circuits are typically used to recover precious metals from solutions as opposed to slurries.The design of CIP/CIL/CIC is closely related the design of agitated leach circuits. The primary consideration is that the use of GAC to remove gold from leach circuit. This means carbon attrition is a major concern in the selection of equipment, activated carbon and of handling the carbon used in the circuit.

Carbon losses due to attrition or deterioration of GAC are important not only because of cost of GAC itself but also because of fine carbon results from attrition continues to adsorb precious metals and then cannot be contained in the recovery circuit. The associated loss of fine carbon with precious metals loaded results in reduced recovery of precious metals which affects the profitability of the operation.

Kalpaka has been supplying top quality activated carbon for may years to various gold mines across the globe. Our long-time presence in this market has assisted us to develop an impressive and diversified activated carbon products for the gold mining industries.

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