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Gold Recovery From Gold–Cyanide Solutions

     

The process involves treating gold cyanide solution using a PH adjustment method to recover gold.

PH Adjustment Method for Gold Recovery: The [Au(I)(NH3)2(SO3)2]^3- complex ion is stable at a PH of 8~9, making it suitable for electroplating purposes.

Behavior of the Complex Ion Upon pH Reduction: When the pH decreases, the complex ion dissociates into gold ions, sulfite ions, and ammonia (NH3).

Role of Sulfate Ions in Gold Ion Reduction: The sulfate ions reduce the gold ions to metallic gold.

Gold Recovery at Adjusted pH Levels: By adjusting the PH to 2~3 using hydrochloric acid, the gold is reduced to elemental gold powder.

Filtering and Washing for Gold Recovery: After reduction, the gold powder is filtered and washed before being collected for reuse.

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