Selective separation of metals from waste printed circuit boards using supergravity-assisted liquation technology
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING(2024)
摘要
Waste printed circuit boards (WPCBs) are the most crucial components of electronic waste,containing highvalue metals that are attractive secondary sources and main recycling targets. This study proposed a combined method of supergravity technology and liquation technology to separate metals from WPCBs. Fe-rich, Cu-Zn and Cu-Sn phases were gradually precipitated and separated in supergravity fields. Two key parameters of separation temperature and gravity coefficient were investigated under different conditions. The optimum temperature was 1100 degrees C for separating Fe-rich alloy, and 800 degrees C for separating Cu-Zn and Cu-Sn alloy. Moreover, controlling the gravity coefficient at 600 in this study was deemed the most appropriate and energyefficient. Under the optimum conditions, the mass fractions of Fe, (Cu + Zn), and (Cu + Sn) in Fe-rich, Cu-Zn, and Cu-Sn alloy reached 81.8 wt%, 95.0 wt%, and 89.9 wt%, respectively. A potential industrial apparatus for the novel method was also proposed. The results demonstrate that the proposed supergravity-assisted liquation method is a promising and optimized approach for selectively separating metals from WPCBs.
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关键词
Supergravity,Liquation,Waste printed circuit boards,Metals,Separation
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