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Precious Metal Recovery from Electronic Waste

     

The process commences with the dismantling and pretreatment of waste printed circuit boards (WPCBs). After crushing and liberation, the feedstock enters the core high-temperature smelting stage. During this phase, organic components are pyrolyzed into gases and oils, ceramic constituents form molten slag, while metals are enriched in the copper matte.

Subsequently, the copper matte is processed through converting and electrolytic refining to yield cathode copper with a purity as high as 99%. Eventually, precious metals such as gold (Au), silver (Ag) and platinum (Pt) are concentrated in the anode slime generated during electrolysis, and further extracted via anode slime refining.

This flow chart clearly demonstrates that although pyrometallurgical technology can form a complete industrial chain covering the whole process from pretreatment to precious metal recovery and achieve high metal enrichment and recovery rates (Au, Pd > 95%), it continuously produces waste gas containing pollutants including CO₂, CO, zinc (Zn), tin (Sn) and mercury (Hg), as well as waste slag rich in impurities (e.g. Sn, Fe) during operation. This also intuitively confirms that the technology faces core challenges of high energy consumption and severe secondary environmental pollution.

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