Application of the process of Adsorption of complex aurocyanide

Adsorption of aurocyanide complex can be done using strong base resin and weak base resins. Strong base resins have high loading capacity and good kinetic but its selectivity is bad.  The selectively of adsorption of the different metal cyanides is pH dependant. At low pH, metal cyanide salts are precipitated which reduces competition for resin adsorption sites. Selective precipitation of base metal prior to precious metal extraction by strong base resins is an option. The main disadvantage of strong base resin is the elution, but has been shown that thiocyanate is a good alternative.

Several elution tests with thiocyanate were carried out by C. Fleming.[10] Employing a concentration 0.5 to 5.0 M found different elution rates, obtaining the best result with a solution 5.0 M. the concentration of gold on the resin being reduced from 4500 to less than 20 g/t in 4 hours under ambient conditions. However a solution 2.0 M can be adequate.  See Figure 8.

Gold Mining &  Gold Prospecting GOLD RECOVERY WITH ION EXCHANGE RESINS History of resins in Gold Recovery Resins structure in Gold Recovery Process Resin Applications; Chelating resins. Brands of resins Polystyrene anion exchangers. Resin properties Strong base resins Weak base resins Ion exchange technology adapted to the treatment of aurocyanide solutions comprises  three steps: loading, elution, and recovery List Methods of Elution Gold  Recovery after Elution Selecting a resin to recover Gold Development of the process of Resin Gold Extraction Application of the process of Adsorption of complex aurocyanide Examples - Case Studies of plants with resins  recovery systems GOLD RECOVERY WITH ION EXCHANGE RESIN Process Summary REFERENCES