Competitive Equilibrium Adsorption of Metal Cyanides on Activated Carbon

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Abstract
Adsorption equilibria in aqueous solutions of metal cyanides are imperative in the description of the adsorption behavior of carbon-in-pulp plants. The transfer of oxygen into the liquid phase was found to have a critical influence on adsorption equilibria of both gold and silver cyanides on activated carbon. Freundlich isotherm expressions described the equilibria of adsorption of single metal cyanides on carbon adequately over a wide range of concentrations. These expressions were used, together with competition coefficients estimated from binary systems of metal cyanides, to yield Freundlich-type multicomponent isotherms for the competitive adsorption of gold and silver cyanides on activated carbon. It was shown that the ideal adsorbed solution model is not applicable to the adsorption of gold and silver cyanides on activated carbon.