FACTORS INFLUENCING THE EFFICIENCY OF A CARBON-IN-PULP ADSORPTION CIRCUIT FOR THE RECOVERY OF GOLD FROM CYANIDED PULPS.
Material balance equations were given to describe the adsorption of gold cyanide on activated carbon in either batch or continuous counter-current CIP systems. Kinetic and equilibrium parameters estimated from batch tests were shown to predict the behaviour of a small scale continuous plant accurately. A parametric sensitivity analysis of this model was conducted in order to explain the factors which influence the efficiency of a CIP plant. Insufficient mixing, large diameters of the carbon particles, the presence of competitive adsorbates, high temperature and pH values, insufficient regeneration of the carbon, a deficiency of dissolved oxygen and the presence of insoluble organics and fine slime particles all act to increase the concentration of gold in the barren solution.