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Extraction Of Gold From Cyanide Waste Solutions

     

Gold Recovery from Cyanide Waste Solutions:

The treatment method involves recovering gold from cyanide waste solutions, primarily generated by electronics manufacturing facilities that contain gold. This process utilizes either ferrous chloride (FeCl2) or ferrous sulfate (FeSO4) as a reducing agent to extract gold from the solution.

Pre-Treatment Process:

The cyanide waste solution is heated until it becomes viscous.

Hydrochloric acid (HCl) is then added, repeating this process 2~3 times.

After dilution with water and reheating to a temperature of 70-80°C, a reducing agent (iron(II) salts) is slowly introduced until all the gold is precipitated.

Alternative Reduction Method:

Sodium thiosulfate (Na2S2O3) or sulfur dioxide (SO2) can also be employed as reducing agents to facilitate gold recovery from the cyanide solution.

This method ensures efficient and effective extraction of gold from cyanide waste solutions, adhering to environmental regulations and optimizing resource recovery processes.

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