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Recovering Gold from Gold-Containing Waste Liquids

     

Gold-containing waste liquids mainly include electroplating waste liquids (primarily cyanide waste plating liquids and waste ammonium gold sulfite plating liquids), aqua regia etching waste liquids, chlorination waste liquids, and various types of gold-bearing washing water.

Electroplating waste liquids have a relatively high gold content: generally, acid gold plating waste liquids contain 4-12 g/L of gold, while alkaline gold plating waste liquids can have a gold content as high as 20 g/L.

Common methods for recovering gold from these waste liquids include:

Recovering gold from cyanide gold-containing waste liquids by zinc (aluminum) displacement (using zinc wire or zinc powder); 

Recovering gold from waste ammonium gold sulfite plating liquids by pH adjustment; 

Gold recovery from aqua regia corrosion waste liquids; 

Recovering gold by heated displacement with copper wire (or copper scraps).

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