A Review Paper on Studies and Research on Gold Recovery Cyanidation Process through Adsorption on Activated Carbon

The use of gold adsorption by activated carbon has recently become widespread .This has caused a great deal of interest in the kinetics of gold adsorption onto activated carbon. Coconut shells are the most widely used raw material for the production of activated carbon suitable for gold production by cyanide leaching. The purpose of this review paper is to describe in simple terms what activated carbon is all about and how it adsorbs gold. The understanding of the mechanism of gold adsorption is important because the Carbon in pulp/Carbon-in-Leach processes work as a result of the gold adsorption mechanism, which is a chemical occurrence the mechanism appears to have an initial adsorption stage that involves the adsorption of an ion pair: Mn+[Au(CN)-2]n , where Mn+ is a metal ion (for example Na+, K+and Ca2+) that has a lower solubility than the Au(CN)-2 anion in the adsorption medium, followed by a reduction step in which either a sub-stoichiometric Au(CN)x surface species or a cluster-type compound of gold is formed.