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gold-bearing waste solution

     

The cyanide-containing gold-bearing waste solution employs the zinc (or aluminum) displacement method (using zinc wire or powder) for gold recovery. Before the displacement process, zinc powder is first immersed in a 5%10% lead acetic acid solution for 35 minutes. 

Then, an amount of 810 g/L of zinc powder (chips) is added to the cyanide plating waste solution. The displacement process is continued for 10-15 days, with stirring performed once every 2 days, and zinc powder added once every 4-5 days.

To accelerate the reaction, heating or adding lead acetic acid catalyst can be employed. After the displacement is complete, the clear solution is removed, and the precipitate is treated with a 20% nitric acid solution for several minutes, then allowed to settle with the clear liquid repeatedly to obtain pure gold powder. 

The electronegativity of aluminum is greater than that of zinc. Using aluminum for the displacement of gold in cyanide solutions involves the same operations as with zinc, but the solution should be heated to 50-60°C for optimal results.

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