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Recovering Precious Metals

     

To address the key challenges of efficiently separating and recovering precious metals from waste printed circuit boards (WPCBs) and achieving a win-win outcome of economic and environmental benefits in the resource utilization of electronic waste, the following process is developed:

First, WPCBs are pulverized into particles via mechanical processing technology. The obtained particles are then separated into metallic and non-metallic fractions under the action of a high-voltage electrostatic field. After that, two liquid phase separation systems are constructed successively for the recovered metallic fractions: the Fe-Cu high-temperature liquid phase separation system and the Cu-Pb relatively low-temperature liquid phase separation system.

Next, by leveraging the selective partitioning rule of components in the WPCB metallic fractions in the aforesaid liquid phase separation systems, base metals and other non-ferrous metals are separated with high efficiency, while nearly all precious metals are enriched in the Cu-rich phase.

Subsequently, hydrometallurgical technology is adopted to separate and recover precious metals from the small amount of Cu-rich materials loaded with highly concentrated precious metals. This process can significantly reduce the consumption of chemical reagents during the separation and recovery of multi-component metals, and mitigate the ecological and environmental hazards posed by electronic waste.

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