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Gold Recovery From Gold-bearing Waste Liquors

     

Gold-bearing waste liquors include electroplating waste effluents, which are mainly composed of waste cyanide gold plating solutions, waste ammonium gold sulfite gold plating solutions, aqua regia etching waste liquors, chlorination waste liquors, and various gold-bearing rinse waters.

Electroplating waste liquors have a relatively high gold concentration: that of acidic gold plating waste liquors generally ranges from 4 to 12 g/L, while the concentration of alkaline gold plating waste liquors can reach up to 20 g/L.

Available methods for gold recovery from gold-bearing waste liquors are as follows:

(1) Recover gold from cyanide gold-bearing waste liquors via the zinc (aluminum) cementation process, using zinc wire or zinc powder as the precipitant.

(2) Recover gold from waste ammonium gold sulfite gold plating liquors via the pH adjustment method.

(3) Recover gold from aqua regia etching waste liquors.

(4) Recover gold via heated cementation with copper wire (or copper turnings) as the precipitant.

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