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Process for Gold Recovery from Electronic Waste

     

This is a schematic process flow diagram for gold recovery from electronic waste via the combined iodide leaching-electrodeposition technology. The core of this process lies in the use of the iodine-iodide redox couple as the leaching agent, which reacts with gold to form stable, soluble gold-iodide complexes that dissolve into the solution.

Subsequently, the gold complex-laden leachate is fed into the electrodeposition system. With an electric current applied across the electrodes, gold ions are reduced to elemental gold and deposited on the cathode surface, achieving both efficient gold recovery and the regeneration and recycling of the iodine-based leaching agent. This schematic of the integrated process highlights the potential of the iodide-based method as a highly efficient, highly selective cyanide-free alternative. Its integrated "leaching-recovery-regeneration" design particularly embodies the green metallurgy philosophy of closed-loop circulation and reagent reuse.

However, this technical route also clearly identifies the key challenges that must be addressed for its industrial application, including cost control of iodine reagents, the impact of interfering ions on selectivity in complex systems, optimization of electrodeposition efficiency, and stable operation of the entire system during engineering scale-up.

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