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Sequential Precipitation-Assisted Selective Recovery of Gold and Copper from E-Waste
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DOI：10.1021/acs.iecr.5c04043.png)
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Abstract
En 中文
The recovery of noble metals from e-waste is critical for sustainable industrial operations. This study presents a sequential, precipitation-assisted extraction method for the selective recovery of gold and copper from the aqua regia leachate of waste CPU pins. Gold was selectively precipitated as tetraphenylphosphonium tetrachloroaurate (TPPAuCl4) via precipitate reaction or double displacement reaction, achieving 99% recovery at trace levels (0.5 ppm) and a high precipitation capacity of 466 mg/g. Copper was subsequently recovered as Cu(DDTC)2 with a 98% efficiency through pH-controlled coordination precipitation. The recovered complexes were characterized by XPS, HR-MS, and UV–vis spectroscopy, and reduction of TPPAuCl4 produced metallic gold of 99.8% purity (23.94 karats). Unlike conventional liquid–liquid extraction, the method avoids volatile organic solvents, minimizing secondary pollution. The use of a commercially available and recyclable reagent (TPPBr) enhances operational simplicity and industrial scalability. This approach combines high efficiency, selectivity, and environmental compatibility, offering a practical and sustainable strategy for multimetal recovery from e-waste in industrial applications.
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