Activated Carbon for Precious Metals Recovery
Adsorbents are materials or elements that perform adsorption. Adsorption is a process by which a good amount of ions or molecules are trapped and retained which must be isolated or separated, above all, from some fluid. Among the most used adsorbent materials is activated carbon.
Activated charcoal and its applications
Activated carbon refers to a set of adsorbent agents of carbonic origin characterized by a porous structure (micropores) used in the separation of materials and the filtration.–
The adsorbent capacities of the activated carbon allow its application in different areas, such as:
- Filtration and treatment of water
- Air filtration+++
- Medical poisoning adsorbent
- Recovery and cleaning of waste water
- Cleaning of spills
- Recovery of precious metals
Recovery of precious metals
Carrboro is a form of activated carbon in a granular form specifically designs to recover cyanides of silver and gold. It is made of raw material, coconut shell and raw material with which it gets the maximized hardness in the market.
It is known as recovery of precious metals by which these metals are isolated from other materials with which they are mixed or for which they are contaminated. For example, an electronic component within which gold is present may be grounded until the desired metal molecules are readily isolated.
Once the precious metals have been isolated they can be easily recovered and reused for various purposes. Among the most effective processes for the recovery of precious metals, specifically, gold is the use of activated carbon.
Activated charcoal in gold recovery
When gold is dissolved in a cyanide solution, the best way to recover it is through the use of activated carbon, which is a viable alternative to the use of zinc.
The process of recovery of gold by means of activated carbon is carried out as follows:
- Activated charcoal is placed in a bed within towers. The cyanide solution will pass through the activated carbon.
- When the cyanide solution passes through the bed of activated carbon the gold is trapped in the micropores.
- The cyanide solution is removed completely free of gold.
- A desorption step is performed, ie the activated carbon that carried out the adsorption of the gold is stripped of it for its recovery.
- Already isolated gold can be reused, just like the coal that is reactivated for a subsequent gold recovery process, can even be used in different processes, such as water filtration, as the case may be.